TABLE OF CONTENTS
1.0 SCOPE ...... 5 2.0 STANDARDS, CODES AND SPECIFICATIONS ...... 6 2.1 GENERAL SPECIFICATIONS ...... 6 2.2 STANDARDS AND CODES ...... 6 2.3 CERTIFICATION ...... 6 3.0 SERVICE CONDITIONS ...... 7 3.1 ENVIRONMENTAL CONDITIONS ...... 7 4.0 GENERAL REQUIREMENTS ...... 8 4.1 DRAWINGS AND SPECIFICATIONS ...... 8 4.2 MATERIAL, WORKMANSHIP AND SUITABILITY ...... 9 4.3 AREA CLASSIFICATION ...... 9 4.4 DEGREES OF PROTECTION ...... 10 4.5 EQUIPMENT LOCATIONS...... 10 4.6 REFRIGERANT CHOICE ...... 10 5.0 EQUIPMENT ...... 11 5.1 AIR HANDLING UNITS ...... 11 5.1.1 Design ...... 11 5.1.2 Technical specifications ...... 11 5.1.3 Casing ...... 11 5.1.4 Fresh air intake / recirculation section ...... 12 5.1.5 Filter section ...... 12 5.1.6 Fan section ...... 13 5.1.7 Heating coil ...... 13 5.1.8 Electric pre heater ...... 13 5.1.9 Water heating coil ...... 13 5.1.10 Cooling Coil ...... 14 5.2 DUCT HEATER ...... 14 5.2.1 Design ...... 14 5.2.2 Technical specifications ...... 14 5.2.3 Construction ...... 14 5.2.4 Electrical part ...... 15 5.2.5 Maintenance ...... 15 5.3 LOCAL INDOOR RECIRCULATION UNITS (FAN COIL UNITS) ...... 15 5.4 MIST ELIMINATOR ...... 15 5.4.1 Design ...... 15 5.4.2 Technical specifications ...... 16 5.4.3 Installation ...... 16 5.4.4 Accessibility ...... 16 5.4.5 Condensate drainage ...... 16 5.5 SOUND ATTENUATORS ...... 16 5.5.1 Design ...... 16 5.5.2 Technical specifications ...... 16 5.5.3 Frame ...... 16 5.5.4 Baffle plates ...... 16 5.5.5 Assembly ...... 17
Neptune Energy Netherlands B.V. Specification 541 rev. 1 Page 2 of 29 5.6 BALANCING DAMPERS ...... 17 5.6.1 Design ...... 17 5.6.2 Technical specifications ...... 17 5.6.3 Installation ...... 17 5.7 SHUT OFF DAMPER ...... 17 5.7.1 Design ...... 17 5.7.2 Technical specifications ...... 17 5.7.3 Installation ...... 18 5.8 NON RETURN DAMPERS ...... 18 5.8.1 Design ...... 18 5.8.2 Technical specifications ...... 18 5.8.3 Installation ...... 18 5.9 PRESSURE RELIEF DAMPERS...... 18 5.9.1 Design ...... 18 5.9.2 Technical specifications ...... 19 5.9.3 Installation ...... 19 5.10 FIRE DAMPERS ...... 19 5.10.1 Design ...... 19 5.10.2 Technical specifications ...... 19 5.10.3 Construction ...... 19 5.10.4 Actuator ...... 20 5.10.5 Control ...... 20 5.10.6 Installation ...... 20 5.11 LOCAL ELECTRIC HEATER ...... 20 5.11.1 Technical specifications ...... 20 5.11.2 Maintenance ...... 20 5.12 CHILLER ...... 21 5.13 BUFFER VESSELS ...... 21 6.0 DUCTING ...... 22 6.1 GENERAL ...... 22 6.2 DUCT DESIGN ...... 22 6.3 CONSTRUCTION...... 23 6.4 DUCT ACCESSORIES ...... 24 6.4.1 Rain hood ...... 24 6.4.2 Inspection panels and doors ...... 24 6.4.3 Supports and mounting hardware ...... 24 6.4.4 Penetrations and packing ...... 24 6.4.5 Joints and mastics ...... 24 6.5 DUCT INSULATION...... 25 6.5.1 Insulation material ...... 25 6.5.2 Insulation cladding ...... 26 6.5.3 Typical insulation ducting ...... 26 6.6 TESTING ...... 27 6.6.1 Test points ...... 27 6.6.2 Testing requirements ...... 27
Neptune Energy Netherlands B.V. Specification 541 rev. 1 Page 3 of 29 7.0 PIPING ...... 28 7.1 DESIGN ...... 28 7.2 MATERIAL SPECIFICATIONS ...... 28 7.3 INSULATION...... 28 7.4 BALANCING VALVES ...... 28 7.5 SHUT-OFF VALVES ...... 28 8.0 PREFERRED SUPPLIERS LIST ...... 29
Neptune Energy Netherlands B.V. Specification 541 rev. 1 Page 4 of 29 1.0 SCOPE
1.1 This specification describes the minimum requirements for the work to be performed by the Heating, ventilation and air conditioning (HVAC) Contractor in order to properly fabricate, install, test and put in operation the heating, ventilation, air-conditioning and other required systems for a production facility which will be/is located in the Dutch Sector of the North Sea.
1.2 All conflicts between the requirements of these relevant documents or package shall be referred to Company for clarification.
1.3 The omission from this specification of any item or items essential for the correct functioning of any part of the specified equipment shall be brought to the attention of Company. Failure to do this shall not absolve the Contractor from installing the equipment complete in every respect.
1.4 All substitutions and deviations from this specification shall be highlighted by Contractor who shall notify Company in writing of requested substitutions or deviations. Contractor shall not proceed with any such substitution, installation or purchasing prior to receiving Company's written approval.
1.5 Contractor shall not carry out any testing or pre-commissioning of equipment or bulk items without submitting prior notification to Company. Company reserves the right to witness all testing (functional, running, or otherwise) and pre-commissioning.
1.6 It shall be Supplier's responsibility to be, or to become knowledgeable of the requirements of the specified Standards and Codes. Any alterations or changes to the equipment to make it meet the aforesaid requirements shall be at the expense of the Supplier.
1.7 Before construction can be started the following documents will be supplied for approval by Contactor: Datasheets of all selected installation components, if applicable Construction drawings (detailed workshop drawings) of ducting and accessories (equipment, dampers, testing points, inspection hatches) with dimensions showing the completed detail design Ventilation systems Condensate drainage Penetration details
After construction at least the following documents will be supplied by Contactor: As built information (red and blue marked ups) for all supplied systems, including as built drawings and technical information. Spare parts list for supplied components; Executed and approved balancing reports for the supply and extraction systems; Two year guarantee certificate for supplied components.
1.8 As used in this specification, the terms and phrases listed below are defined as follows: Supplier: The firm or person(s) contractually responsible to Company for the assembly, performance and quality of the unit(s) described herein. Company: Neptune Energy Netherlands B.V. Contractor: Party to whom the fabrication, installation, hook-up and commissioning are assigned.
Neptune Energy Netherlands B.V. Specification 541 rev. 1 Page 5 of 29 2.0 STANDARDS, CODES AND SPECIFICATIONS
The requirements of the standards, codes and supplemental specifications listed below shall be met unless specially excluded by this specification and specifications referred to herein.
2.1 GENERAL SPECIFICATIONS
103 Supplier Document Requirements (SDR) 104 General Engineering Standards 201 Supply and Fabrication of Steel Structures 205 Architectural requirements 501 Piping Design 502 Piping Fabrication and Pressure Testing 503 Pipe Fittings and Valves 518 Insulation Piping and Equipment 524 Coating Threaded Fasteners 525 General Painting and Coating Specifications 541 General Construction of Heating, Ventilation and Air Conditioning installations 610 General Construction of Electrical, Instrumentation and Telecommunication Installation 611 Specification, Assembly, Cabling termination, Earthing and Testing of Electrical Instrumentation Panels and Cabinets 612 Testing, Pre-commissioning & Commissioning 613 Typicals for Electrical & Instrumentation
Latest revision of above referenced specifications can be found on https://www.neptuneenergy.com/en/about-us/supply-chain/suppliers-to-neptune-energy- netherlands-bv
2.2 STANDARDS AND CODES
All equipment specified herein shall conform in design, material and performance with the latest editions (with amendments) of the following Codes and Standards current at time of order placement.
Dutch rules for working environment (ARBO arbeidsomstandigheden wet). Dutch Mine Regulations 31 October 2002 (Mijnbouw Wet, staatsblad 542).
Directive 94/9/EC (ATEX 95) Equipment and protective systems intended for use in potential explosive atmospheres. The latest CENELEC standards. The Regulations of “Het Nederlandse Normalisatie Instituut“ (NEN) as applicable as such but not limited to:
NEN-EN-ISO 1538 Petroleum and natural gas industries – Offshore production installations- Heating, ventilation and air conditioning EMC DIRECTIVE Guide for the EMC directive 2004/108/EC EU CE MARKING conform European Rules 93/465/EEC
2.3 CERTIFICATION
Equipment located in hazardous areas shall be certified in accordance with ATEX directive 94/9/EC. Only equipment with certification issued by the notified bodies will be accepted.
Neptune Energy Netherlands B.V. Specification 541 rev. 1 Page 6 of 29 3.0 SERVICE CONDITIONS
Equipment and all used materials shall, in all respects, be suitable and/or protected for operation in service conditions typical for platforms in the North Sea and in a humid, salt laden and corrosive atmosphere. Unless otherwise specified in the Request for quotation and/or Purchase Order, equipment shall be suitable for use under the following conditions.
3.1 ENVIRONMENTAL CONDITIONS
Relative humidity may be as high as 90 percent at a maximum temperature of +35°C. Rapid changes of air temperature and pressure shall be taken into account. Salt laden.
Neptune Energy Netherlands B.V. Specification 541 rev. 1 Page 7 of 29 4.0 GENERAL REQUIREMENTS
The HVAC Contractor shall be responsible for the following:
The furnishing of all labour, supervision, tools and test equipment required for the installation and testing of the complete HVAC system as per contract. The equipment is to be stored in a dry, heated store and handled in such a manner that upon final installation all materials and equipment reflect ex-factory finish, appearance and performance. The testing and adjustment of all HVAC equipment and material, including equipment and material furnished by others. The notification to the Company's representative at least 1 working week prior to performing any test for final equipment acceptance. The notification to the Company's representative, as soon as possible, about the failure of any material, equipment or system to pass a test. The documentation and certification of all tests and submission of these tests to Company's representative after each test is performed. All certificates of delivered equipment shall be submitted to the Company's representative.
4.1 DRAWINGS AND SPECIFICATIONS
The HVAC installation shall in every respect be in accordance with the drawings and specifications which cover the HVAC work.
In general the HVAC plot plan drawings are diagrammatic in nature and do not indicate exact and complete routes of ducting, piping or wiring. The location of HVAC equipment is approximate and subject to minor corrections.
No measurements of a drawing by scale shall be used to establish dimensions for installation purposes. When not dimensioned, exact locations are to be defined in the field and shall be satisfactory to Company's representative.
Contractor shall be guided in his work by drawings of other trades, by architectural and structural drawings and by Supplier's equipment drawings.
Contractor shall mark-up one set of drawings indicating as-built conditions. During the project Contractor shall keep an up-to-date record of all changes in the HVAC installation and indicate these changes on the relevant drawings. Company shall have access to these documents at all times.
The following colour code will be used: Red = out Blue = in Yellow = correct
Contractor shall produce all shop-drawings as can be regarded practical to clarify specific installation details.
These drawings shall be returned to Company's representative after completion.
The addition of specifications or drawings to the list will not constitute extra cost if it merely amplifies and/or clarifies information already shown on previous drawings.
Neptune Energy Netherlands B.V. Specification 541 rev. 1 Page 8 of 29 4.2 MATERIAL, WORKMANSHIP AND SUITABILITY
All material shall be new and free of defects and shall be the best quality of the respective kinds.
All work that will be carried out at a yard or platform must comply with the Yard or Platform regulations
Where several approved manufacturers are shown for one type of material, all material of that type is to be of the same manufacturer.
All materials, equipment and methods of installation shall be approved by Company's representative.
Where specific manufacturers are mentioned in the specifications or drawings without qualification as to an alternate, only that particular make or catalogue number, etc. will be acceptable to Company's representative.
Contractor shall be responsible for furnishing all material and equipment necessary to complete the HVAC installation in accordance with the specifications and drawings. Contractor shall also furnish and install all material and equipment which is not specifically mentioned or shown but which is necessary for a proper, complete system.
Work that will be concealed (for example by a false ceiling) shall be left open for inspection and test until approved by Company's representative.
All materials shall be approved prior to installation.
Contractor shall carry out all installation work with competent tradesmen with experience in this type of installation. Contractor shall provide competent technical supervision. The complete installation shall be of the highest grade and carried out in accordance with the relevant rules and regulations herein specified, and executed to the satisfaction of Company. Upon request training certificates shall be handed over.
All tools, installation and testing equipment shall be provided by Contractor for his use. Where special tools are recommended by any equipment manufacturer, Contractor shall conform to such recommendations.
Any equipment damaged or broken on site shall be replaced or repaired by Contractor at his cost.
4.3 AREA CLASSIFICATION
The equipment will be located in either a safe, or a potentially explosive atmosphere. Each area will be classified as shown on the Hazardous Area Drawings.
However, all outdoor equipment including HVAC equipment shall be classified for use in hazardous areas, equipment and wiring must comply with the NEN-EN-IEC 60079-14. EX’n’ equipment shall not be used.
Deviations are subject to written approval by Company.
Neptune Energy Netherlands B.V. Specification 541 rev. 1 Page 9 of 29 4.4 DEGREES OF PROTECTION
Depending on the location of the equipment or Packaged Units, one of the following degrees of protection of the enclosure against contact with live or moving parts and against ingress of solid foreign bodies and liquids shall be selected in accordance with IEC 60529. Indoors IP-41 Outdoors IP-56 as a minimum
4.5 EQUIPMENT LOCATIONS
All equipment and materials shall be installed in accordance with the relevant drawings and this specification.
Any variations from the proposed positions shall be agreed in writing with Company prior to installation.
Sufficient free space for maintenance and escape routes shall be maintained in accordance with the applicable regulations or standards.
Equipment shall be located in accordance with the following requirements: Protected against damage Protected against vibration Operability and serviceability Display instruments and flashing lights to be legible and visible from main access areas Accessibility for maintenance without scaffolding
Electrical equipment shall, unless unavoidable due to the functionality or necessity, be installed indoor and away from hazardous areas.
Pressure and Pressure differential transmitters, which have to be installed outdoors, shall be sheltered by use of enclosure.
Final location shall be selected to avoid interference with escape routes, walkways, other equipment, pipes, etc. and obstruction against activities related to transport and lifting operations.
Equipment shall not be supported on pipe work, handrails, access ladders or cable ladders. Equipment shall not be mounted on blast walls/explosion relieves. Equipment located in areas which do not allow for maintenance accessibility as required, shall as shown on typical drawing be installed such that the equipment can be rotated, raised or lowered into areas where maintenance can take place without the need for scaffolding.
All installation parts shall be free of sharp edges.
4.6 REFRIGERANT CHOICE
CFC and HCFC use is strictly forbidden in refrigerating equipment (air conditioning, cold room, freezer room), whatever the location of construction, of installation, of operation of equipment. Preferred refrigerant gas is R134a. However, depending on specific operating conditions and/or refrigerating capacity, R410A and R407C may also be used.
Neptune Energy Netherlands B.V. Specification 541 rev. 1 Page 10 of 29 5.0 EQUIPMENT
Equipment described here after must be installed in accordance with P&ID, D&ID and calculation results approved by Company
All equipment and materials need to represented in an equipment list including characteristics of each component. All materials, equipment and methods of installation shall be proposed by Contractor and approved by Company prior to purchase and installation.
Components shall be installed in accordance with Manufacturer’s instructions.
All flanged equipment, flanges including mounting holes should be according to ISO 15138.
5.1 AIR HANDLING UNITS
5.1.1 Design
Easy access to all access doors of the air handling units needs to be ensured for maintenance and replacement. Sufficient free space needs to be ensured for replacement of components.
5.1.2 Technical specifications
Air handling units need to be represented in a datasheet including a drawing with equipment sizes, weights, characteristics of each component and the global centre of gravity.
5.1.3 Casing
The casing of the air handling units shall be SS316L. Each section needs to be provided with accessible pressure test points and if necessary maintenance doors.
Construction shall be in accordance with EN 1886 standard. The following design classes are selected for the design of the air handling unit casing:
Table 1: requirements air handling unit casing Classe Casing strength: CEN1A for units up to 25000 m3/h, CEN2A for units above 25000 m3/h Casing air leakage classes CENB Classification of thermal transmittance U of the T2 casing panel of the air handling unit Classification of thermal bridging factor of the Indoor installation: TB3 casing Outdoor installation: TB2
The air handling unit shall be painted according to the applicable specification 525. (Indoor installation: no coating, Outdoor installation: coating).
Casing will be delivered with a stainless steel I-beam bottom frame. The I-beam will be 200 mm height minimum in order to allow the drainage of condensates. This structure must be in Stainless steel and protected against corrosion in accordance with Company’s specification 525.
Neptune Energy Netherlands B.V. Specification 541 rev. 1 Page 11 of 29 All air handling units shall be provided with AISI 316L connecting flanges at inlet and outlet for duct connections at site. The air handling unit panels on such inlet and outlet (with duct connection) shall be provided with additional stiffeners or thicker casing material than the rest of the panel.
Panels of the air handling unit shall be protected by a plastic film, which will be removed during commissioning. The air handling unit shall be designed for a four point lift with certified lifting lugs incorporated in the main skid steel design; for single lift.
The air handling unit shall include a minimum of two earth bosses, located at opposite ends.
5.1.4 Fresh air intake / recirculation section
Fresh air intake section is provided with a contra rotating damper, for maximum and minimum fresh air intake.
Recirculation air section is provided with a contra rotating damper, for maximum and minimum recirculation air flow.
Exhaust air section is provided with a contra rotating damper, for maximum and minimum exhaust air.
5.1.5 Filter section
Filtration shall be assured by one or several filters. Filter materials shall be flame retardant, incombustible and non-odorous. Filter efficiency and class should be in accordance with European standard EN779. The frame receiving the filter (s) shall be SS316L.
Easy access to filters shall be provided for maintenance and replacement.
Maximum air velocity on front filters: 2.5 m/s.
During the start-up period, a temporary filter needs to be placed to flare out construction pollution. This temporary filter will be replaced after Company‘s approval.
Indicator of pressure loss shall be installed on the casing in order to monitor the filter clogging. Each pressure indicator shall be connected to the HVAC control in order to monitor the clogging of filters and air quality. When the maximum clogging delta pressure is reached, an alarm is generated.
Variation of filter pressure loss shall not lead to variation of air flow above 5% of the nominal flow of the air handling unit.
Pre filter needs to be provided with a SS316 drip tray. The condensate drainage of this system needs to be connected to the nearest sewer by Contractor.
The drainage siphon needs to be designed and delivered by the AHU supplier
In case of clogging the drainage needs to be accessible for cleaning purposes.
Neptune Energy Netherlands B.V. Specification 541 rev. 1 Page 12 of 29 5.1.6 Fan section
The fan operating point shall be selected on the steeper section of the fan curve approaching a vertical line from minimum to maximum static pressures, in order to minimise variation in delivered air flow, due to change in external wind pressure
The fans shall be of the variable flow type, direct driven to give duty flexibility. The fan operating point shall be selected on the steeper section of the fan curve approaching a vertical line from minimum to maximum static pressures, to maintain volume fluctuations at a minimum and to reduce wind effects.
The impellers shall be both statically and dynamically balanced. The performance characteristics shall be non-stall and non-overloading.
The fans within air handling unit’s shall be mounted on vibration isolators.
Fan materials are to be anti-static. Spark minimizing features shall be incorporated adjacent to the impeller shroud and leading edge of the stator. Non-metallic materials of the fans shall be non-smoking and non-combustible.
Each fan section needs to be provided with a differential pressure switch.
5.1.7 Heating coil
To realise a minimum supply air temperature an electric heater is integrated in air handling units. Sizing of the heating coil shall not take into account heat gains due to the fan motor.
5.1.8 Electric pre heater
The surface temperature of the heating element shall not exceed 90ºC in all configurations.
The air heater should be fitted with two independent overheating thermostats, one with manual reset and one with automatic reset. The heater shall be asbestos free. The maximum air temperature downstream of the heater must not exceed 40ºC. Interlock between the power supply to the heater and an airflow meter to ensure switch of in case of ventilation air shortage.
Maximum air velocity on fins: for electric heater 4 m/s.
5.1.9 Water heating coil
Coils shall be made of copper tube and copper fins. The coils shall be fitted with connections for vents and drain which shall be routed outside the casing. Coil shall be made suitable for maximum working pressure of 16 bar.
Maximum air velocity on fins: for heating coils 3 m/s.
Downstream the first hot water coil installed in the air handling unit is to be provided with an antifreeze thermostat equipped with manual reset.
Neptune Energy Netherlands B.V. Specification 541 rev. 1 Page 13 of 29 5.1.10 Cooling Coil
To realise a maximum supply air temperature an cooling coil is integrated in Air handling units.
Sizing of the cooling coil shall take into account heat gains due to the fan motor.
Coils shall be made of copper tube and copper fins. The coils shall be fitted with connections for vents and drain which shall be routed outside the casing. Coil shall be made suitable for maximum working pressure of 16 bar.
Maximum air velocity on fins: for cooling coils 2.5 m/s.
The cooling coil needs to be provided with drip tray, drain pan (SS316L) and condensate drainage. The condensate drain pipe connection through the unit casing shall be insulated with closed cell rubber.
The condensate drainage of this system needs to be connected to the nearest sewer by Contractor.
In case of clogging the drainage needs to be accessible for cleaning purposes.
5.2 DUCT HEATER
5.2.1 Design
The maximum air pressure drop, at nominal flow rate, shall be less than be 50 Pa. The maximum air velocity in an electrical heater shall be 5 m/s.
The surface temperature of the heating element shall not exceed 90ºC in all configurations. For electric heaters installed inside a duct, an even air distribution across heating elements shall be ensured. A minimum distance of 1300 mm (upstream and downstream shall separate the heater from any elbow, transition piece, filter, frame member, fan or damper. More stringent requirements of manufacturer regarding minimum recommended distances shall be respected.
5.2.2 Technical specifications
Electric duct heaters need to be represented in a datasheet including a drawing with equipment sizes, weights, characteristics of each component and the global centre of gravity.
5.2.3 Construction
Each heater shall include the following components: sheathed heating element with fins or smooth surface electrical/junction box safety grill for personnel protection anti-radiation screens in the hot air outlet
The elements shall be black heat type, tubular elements being AISI 316 stainless steel (or equivalent, to be submitted to Company for review) packed with magnesium oxide.
Neptune Energy Netherlands B.V. Specification 541 rev. 1 Page 14 of 29 A high temperature thermostat with manual reset shall limit the surface temperature of the heating elements to a maximum of 90ºC.
An air flow switch with automatic reset shall switch off the heater in case ventilation air shortage.
For integration within ducts or casings, provisions for dilatation need to be considered.
Casing shall be made of the same material as ducts and shall be air tight.
5.2.4 Electrical part
Each electrical heater shall be provided with a terminal box, pre wired electrical components, suitable for control/safety and devices such as: isolating switch relay for remote alarms manual reset high temperature safety cut outs earthing clamps on casing and bolt in terminal for connection of earthing cables
5.2.5 Maintenance
The electrical elements shall be installed so that they can easily be dismantled for cleaning or maintenance without any duct or casing mantling. Electrical connections of all components shall be easy to access. The terminal box shall be external to the air stream.
At the upstream and downstream of each duct electrical heater, an inspection door shall be installed.
5.3 LOCAL INDOOR RECIRCULATION UNITS (FAN COIL UNITS)
Rooms equipped with local indoor recirculation units are used to realize the required room conditions. The unit consists of a chilled water cooling coil with drip tray, water safety tray with water detection switch and condensate drainage, an electric heating coil with safeguarding and a recirculation fan.
On the outside of each room containing fan coil units, two motorized shut off valves shall be installed in the main supply- and return piping. On positive water detection in the water safety tray of any fan coil unit within the room the valves will be closed.
The recirculation units need to be controlled based on the room conditions with a local controller.
5.4 MIST ELIMINATOR
5.4.1 Design
The Mist eliminator needs to be integrated in the air intake ducting to prevent ingress of moisture, salt spray, rain water and dust into the system.
Neptune Energy Netherlands B.V. Specification 541 rev. 1 Page 15 of 29 5.4.2 Technical specifications
Mist eliminators need to be represented in a datasheet including a drawing with equipment sizes, weights, characteristics of each component and the global centre of gravity.
5.4.3 Installation
Mist eliminator shall be installed in a vertical position (in line with horizontal airflow) only. An elbow shall be fitted upstream to the mist eliminator.
5.4.4 Accessibility
Easy access to the mist eliminator needs to be ensured for maintenance and replacement. Sufficient free space needs to be ensured for replacement of components.
5.4.5 Condensate drainage
The Mist eliminator needs to be provided with a condensate drainage including siphon. The condensate drainage needs to be connected to the nearest sewer by Contractor.
In case of clogging the drainage needs to be accessible for cleaning purposes.
5.5 SOUND ATTENUATORS
5.5.1 Design
Sound attenuators needs to be integrated in ducting for noise reduction.
5.5.2 Technical specifications
Sound attenuators need to be represented in a datasheet including a drawing with equipment sizes, weights, characteristics of each component and the global centre of gravity.
5.5.3 Frame
The material of the frame must be SS 316L steel sheets of thickness at least equal to 1 mm. Reinforcements must be installed if any baffle plate dimension is greater than 1800 mm.
5.5.4 Baffle plates
Inside the frame, several baffle plates, regularly spaced, shall be installed. The structure of the baffle plates shall be made of the same material as the frame (SS316L).
Each baffle plate internal cavity shall be filled with sound attenuation media of homogeneous density, vertically arranged in successive layers.
One millimetre glass fibre linen, conglomerated at high temperature, and a perforated steel plate, must be placed on each outer face of media to avoid particles migration.
Neptune Energy Netherlands B.V. Specification 541 rev. 1 Page 16 of 29 5.5.5 Assembly
Assembly must be realised by 4mm rivets. Rivets are made of the same material as the frame (SS316L).
5.6 BALANCING DAMPERS
5.6.1 Design
The balancing dampers shall be fitted in the ducting to balance air flow rates in duct work, adapt sizing to duct size.
5.6.2 Technical specifications
The outer frame shall be made of steel in accordance with used ductwork metal.
The blade and the handle shall be contained in the damper frame length. In open position, the blades face the direction of the flow and do not cause significant pressure loss or noise.
The bearing shall be made of a material withstanding the environment of its duty. Bearings and shafts shall be maintenance free. The dampers must have silicon gaskets between each blade and between the frame and the blades. Each damper shall have a lockable device with a scaled dial indicating the current position and the full open/close positions.
5.6.3 Installation
Balancing dampers must be able to be installed in any position. When Balancing dampers are installed in insulated ducting, the dampers shall have extended handles to ensure operation.
5.7 SHUT OFF DAMPER
5.7.1 Design
The shut off dampers shall be fitted in the ducting to shut off duct work parts, adapt sizing to duct size.
5.7.2 Technical specifications
The outer frame shall be made of steel in accordance with used ductwork metal.
The blade and the handle shall be contained in the damper frame length. In open position, the blades face the direction of the flow and do not cause significant pressure loss or noise.
The bearing shall be made of a material withstanding the environment of its duty. Bearings and shafts shall be maintenance free. The dampers must have silicon gaskets between each blade and between the frame and the blades. Each damper shall have a lockable device with a scaled dial indicating the current position and the full open/close positions.
Neptune Energy Netherlands B.V. Specification 541 rev. 1 Page 17 of 29
5.7.3 Installation
Shut off dampers must be able to be installed in any position. When Shut off dampers are installed in insulated ducting, the dampers shall have extended handles to ensure operation.
5.8 NON RETURN DAMPERS
5.8.1 Design
Non return dampers shall be fitted in the ducting to prevent backflow through ventilation ductwork. When the pressure in the ductwork drops below minimum opening force required, the blades shall close and seal the duct to prevent back flow and leakages.
5.8.2 Technical specifications
The outer frame shall be made of steel in accordance with used ductwork metal.
In open position, the blades face the direction of the flow and do not cause significant pressure loss or noise. Blades and mechanism shall be contained in the damper frame length. The bearing shall be made of a material with standing the environment of its duty. Bearings and shafts shall be maintenance free.
The blades are linked together and open parallel. The mechanism shall be located outside the airflow. The position of the blades mechanism and associated position indicator shall be located on accessible side. The dampers shall be fitted with a scaled dial to indicate current position.
The dampers must have silicon gasket between each blade and between the frame and the blades.
5.8.3 Installation
Non return dampers can only be installed on horizontal flow.
5.9 PRESSURE RELIEF DAMPERS
5.9.1 Design
Pressure relief dampers shall be used to control the overpressure in rooms.
The opening pressure shall be adjustable by changing the spring load on site. The final adjustment will be carried out during commissioning.
When the room overpressure drops below the adjusted pressure, the blades shall close and seal the room to prevent backflow and leakage.
Neptune Energy Netherlands B.V. Specification 541 rev. 1 Page 18 of 29 5.9.2 Technical specifications
Pressure relief dampers need to be represented in a datasheet including a drawing with equipment sizes, weights, characteristics of each component and the global centre of gravity.
The outer frame shall be made of steel in accordance with used ductwork metal.
In open position, the blades face the direction of the flow and do not cause significant pressure loss or noise.
Blades and mechanism shall be contained in the damper frame length. The bearing shall be made of a material with standing the environment of its duty. Bearings and shafts shall be maintenance free. The blades are linked together and open parallel. The mechanism shall be located outside the airflow. The position of the blades mechanism and associated position indicator shall be located on accessible side. The dampers shall be fitted with a scaled dial to indicate current position.
The dampers must have silicon gasket between each blade and between the frame and the blades.
5.9.3 Installation
Pressure relief dampers can only be installed on horizontal flow.
5.10 FIRE DAMPERS
5.10.1 Design
Fire dampers must be designed and used for ductwork, bulkhead and deck installation to prevent the spread of fire and smoke from one area to another area.
The fire damper must be certified by notified body for use in fire resisting divisions and to the classification (A0, A60, H60, and H120) according to the location of the fire damper.
5.10.2 Technical specifications
Fire dampers need to be represented in a datasheet including a drawing with equipment sizes, weights, characteristics of each component and the global centre of gravity.
5.10.3 Construction
The fire damper material must be Stainless steel. The welding must be continuous.
The fire damper must be supplied non-insulated (insulation must be carried out on site, in accordance with the requirements of the manufacturer). Detailed instructions, drawings and insulation specification must be provided by manufacturer to respect the requirements from certifying authority’s requirements and to obtain agreement from the insurance Company.
Material of the blades must be stainless steel, the blades must be double sheeted aerofoil construction, the blade movement must be opposed type.
Neptune Energy Netherlands B.V. Specification 541 rev. 1 Page 19 of 29 In open position, the blades face the direction of the flow and do not cause significant pressure loss or noise.
Blades and mechanism shall be contained in the damper frame length. The bearing shall be made of Stainless steel. Bearings and shafts shall be maintenance free. Blade stops sealed with “firesil”.
A local mechanical device indicating blades position open / closed must be provided. Indicator must be readable outside the fire damper. The indicator must be readable after insulation, without any dismantling and without removing insulation.
5.10.4 Actuator
The open position of the damper must be done by an electrical actuator. The closing of the damper shall be fail safe and must be obtained by a return spring accommodated within the actuator housing.
The minimum return spring torque must be 15 Nm. The maximum closing time must be 3 seconds after the power supply shortage.
5.10.5 Control
Remote indication of blades fully open and fully closed status must be monitored by position switches installed on the drive shaft which will be connected to the damper blades. The position switches must be mounted in order to be activated when blades of the fire damper are fully open and when the blades of the damper are fully closed.
5.10.6 Installation
Fire damper installation needs to be done in accordance with fire resistance test arrangement drawings attached to the fire resistance test certificate of the fire damper.
Fire dampers must be connected to ducting without ducting transformation (reducing or enlargement).
5.11 LOCAL ELECTRIC HEATER
5.11.1 Technical specifications
Electric local heaters need to be represented in a datasheet including a drawing with equipment sizes, weights, characteristics of each component and the global centre of gravity.
5.11.2 Maintenance
The electrical elements shall be installed so that they can easily dismantled for cleaning or maintenance. Electrical connections of all components shall be easy to access.
Neptune Energy Netherlands B.V. Specification 541 rev. 1 Page 20 of 29 5.12 CHILLER
Chillers need to be represented in a datasheet including a drawing with equipment sizes, weights, characteristics of each component and the global centre of gravity.
The chillers shall be suitable for continuous, full load operation and complete with integral capacity control to maintain the desired unit capacity at all times, from minimum compressor capacity to 100% duty.
Refrigerants with zero or low ozone-depletion potential (ODP) and low global-warming potential (GWP) shall be used. Preferred refrigerant gas is R134a. However, depending on specific operating conditions and/or refrigerating capacity, R410a and R407c may also be used.
Each chiller package shall be mounted on an individual support base frame, complete with anti- vibration mountings and compressor acoustic enclosures as necessary. Manufacturers' standard-range “low-noise” equipment shall be used wherever possible.
The water-cooled condensers shall be of the shell-and-tube type with liquid sub-cooling and shall have removable heads for cleaning and tube withdrawal. The design of the water-cooled condenser shall comply with a recognized industry standard, such as ISO 16812.
Water-cooled condensers shall be mounted on a common base frame with the refrigeration compressors.
Each packaged chiller unit shall be complete with a control panel of the manufacturer's standard range and shall contain at least the following: main isolator; combined door interlock; compressor motor starters; on-off switches; automatic compressor start at minimum load; overload protection; control circuit breaks (CBS); capacity control system; suction and discharge pressure gauges; oil pressure gauge; high-pressure cut-out; low-pressure cut-out; low-oil-pressure cut-out; condenser water flow cut-out; condenser water-temperature gauge; remote signal facilities; common status run; status/alarm for each unit; common alarm fault; timer device to avoid rapid cycling; warning lamps (LED type); running lamps (LED type); reset buttons for the safety devices; hours-run meter for each machine.
5.13 BUFFER VESSELS
Adequate buffer capacity for smooth operation of the chilled water system is to be provided.
Neptune Energy Netherlands B.V. Specification 541 rev. 1 Page 21 of 29 6.0 DUCTING
6.1 GENERAL
The static pressure limit between low pressure (LP) and high pressure (HP) HVAC systems is for the air duct 500 Pa. Below this value the duct would be classified as LP, with internal pressure above 500 Pa and up to 2000 Pa the ducts would be classified as HP.
The maximum allowable air velocities shall be respectively as follows: 7 m/s for LP ducts inside main branches; 4 m/s for LP ducts inside secondary branches; 15 m/s for HP ducts; 8 to 11 m/s for hood exhaust ducts.
6.2 DUCT DESIGN
The duct systems shall be designed to limit pressure drops, to improve the aerodynamics and to prevent turbulence and noise.
The height : width-ratio of ducting shall not be larger than 1:4.
Transition pieces need to be designed so the top angle α is not larger than 60º, (see figure1).
Figure 1: transition piece
Stagger pieces with a gradient higher than 45º need to be constructed as elbows, with turning vanes.
Symmetrical elbows shall have an inner radius of at least 100 mm. To reduce pressure loss elbows shall be constructed with turning vanes. Turning vanes do not apply in the following situations: Elbow is 45º or less Duct width is 400mm or less
The location of the turning vanes are projected in table 2.
Neptune Energy Netherlands B.V. Specification 541 rev. 1 Page 22 of 29 Table 2: Turning vanes Duct width a No. of Location [mm] turning vanes 1 2 3
> 400 800 1 a/3
> 800 1600 2 a/4 a/2
> 1600 2000 3 a/8 a/3 a/2
For tapered elbows the smallest duct width is leading for the number of turning vanes. The positioning of the turning vanes in the large duct width is in proportion to the positioning of the turning vanes in the smallest duct width.
Turning vanes are to be constructed of single sheet of steel; the material of the turning vanes is equal to the duct material. The construction needs to be sufficient strong, while the turning vanes are rigid.
Main branches shall always be equipped with an initial balancing damper to control flow.
Pressure loss due to balancing dampers to prevent noise nuisance shall be less than: 80 Pa in main branches 50 Pa in secondary branches
The balance of the circuits must be determined by during commissioning and must take in account the various devices planned to avoid turbulence (like elbows with turning vanes, angle branches connectors, flow straighteners, etc.).
The ducts shall not be fabricated or installed before contractor has obtained written agreement from Company’s representative on the duct configuration and the pressure loss calculations.
6.3 CONSTRUCTION
All ducts shall be made of stainless steel 316L continuously welded.
Contractor shall clean and remove all labels and other work markings when carrying out the finishing work. All ducts, valves, fire dampers shall be identified by coloured stripes and directional arrows, with black letters or writing to identify the air network concerned.
All outdoor ductwork shall be protected against corrosion and damaging by coating with paint, in accordance with Company specification.
Outdoor ducts shall be 2 mm up to a width of 2500 mm. Even if outdoor ductwork has insulation with mechanical protection, the outdoor ductwork must be stainless steel with above notified thickness.
Flanges, stiffeners, supports, etc. shall be made of the same material as ducting. Flanges including mounting holes should be according to ISO 15138.
For air tightness all ducting joints need to be provided with sealing trip with close cell structure.
Neptune Energy Netherlands B.V. Specification 541 rev. 1 Page 23 of 29 All junctions between carbon and stainless steels shall be suitable insulated with gaskets and bolt sleeves. Dissimilar metal contact should be avoided. Earthing shall be according to Specification 610. The Main earth reference for al earthing systems shall be the main structure.
6.4 DUCT ACCESSORIES
6.4.1 Rain hood
All air intake and exhaust ducting needs to end in a rain hood. The rain hoods are 90º hoods to prevent ingress of rain in the air intake and exhaust ducting. A mesh guard needs to be integrated to prevent ingress of birds and debris. Material : 316 stainless steel
6.4.2 Inspection panels and doors
Contractor shall supply all the necessary sealed panels and doors (SS316L) to enable access to the equipment of the system. The closing devices provided on such doors and panels shall be readily manoeuvrable (1/4 turn fasteners). Screw fasteners of all types shall be prohibited.
For ducting such as supply air and return air, sealed panels and doors for inspection shall be installed at each equipment as fire dampers, sound attenuator, heaters, etc. and at each elbow.
6.4.3 Supports and mounting hardware
The mountings and supports should be of a strength and durability compatible with the ductwork and any attached equipment and shall be engineered to avoid all transfer of vibrations to the structure and to avoid galvanic corrosion. Teflon strips (50 x 5 mm) shall be provided between the supports and the ducts in order to fully isolate the ducts from the supports. Supports shall be generally spaced a maximum of two metres apart.
All supports for ducts and accessories shall be made of stainless steel 316L.
Ducts shall be secured against both horizontal and vertical movement. Duct supports shall be equipped with vibration dampening devices.
All bolts, nuts, washers and other fasteners shall be made of stainless steel 316L.
Typical support drawing shall be submitted for Company’s approval before installing.
6.4.4 Penetrations and packing
Ducting passes through spaces surrounded by “A” class divisions must have the same fire integrity as the divisions they pierce.
Typical support drawing shall be submitted for Company’s approval before installing.
6.4.5 Joints and mastics
Joints and tight mastics for ducting shall be non-combustible according to safety requirements. They shall be free from asbestos. Joints and mastics shall be airtight in all conditions.
Neptune Energy Netherlands B.V. Specification 541 rev. 1 Page 24 of 29 6.5 DUCT INSULATION
6.5.1 Insulation material
All supply-air systems should be insulated where thermal conservation and anti-condensation protection is required. The insulation shall be complete with vapour barriers where the ventilation air temperature is likely to be below the ambient dew-point temperature. Extract and internal return air systems should not be insulated.
All insulating materials shall be non-combustible or meet the requirements of IMO Resolution MSC 61(67).
Installation and repair of duct insulation shall be in accordance with either recognized standards or requirements given in Table 3.
It is necessary to assure the protection of personnel against harmful fume generation when passive protection systems are installed.
Where ducts penetrate fire-rated barriers, a sleeve with fire damper of least 900 mm (total length, sleeve and fire damper) long, 3 mm thick shall be provided. The sleeve shall have the same fire rating as the barrier.
Table 3: Insulation requirement Service Duct location Insulation material a, b, c Purpose Heat conservation d Internal Mineral wool or other To reduce heat losses suitable Material Heat conservation d External Cellular glass To reduce heat losses Flexible elastomeric foam (FEF) Cold conservation d Internal Flexible elastomeric foam To maintain low (FEF) temperature or prevent Cellular glass condensation on ductwork Cold conservation d External Cellular glass To maintain low Flexible elastomeric foam temperature (FEF) Fire proofing A60 e Internal Mineral wool of rock-type, To maintain fire 110 kg/m3 integrity Fire proofing A60 e External Alkali earth silica To maintain fire (AES-wool) integrity Fire proofing H0 e Internal and Alkali earth silica To maintain fire External (AES-wool) integrity Fire proofing H60 e Internal and Alkali earth silica To maintain fire External (AES-wool) integrity Acoustic insulation, Internal and Mineral wool To reduce noise ductwork internal external a. he thermal conductivity shall be a maximum of 0,042 W/m∙K at 20 °C mean temperature. b. Alternatives shall be qualified. If alternative materials are proposed, the insulation capability should be equivalent to, or better than, the capability for the specified material and thickness. c. Insulation should not have an “open” surface allowing fibres to break off and pollute the surroundings. A factory- applied cover is usually preferred to seal the insulation. d. For heat conservation and cold conservation, standard pre-insulated ductwork may be used. e. All fire insulation and installation methods on fire-rated components shall be certified.
Neptune Energy Netherlands B.V. Specification 541 rev. 1 Page 25 of 29 6.5.2 Insulation cladding
All open-cell insulation materials shall have factory-applied alufoil covering with a minimum thickness of at least 18 μm. In addition, outside insulated ductwork shall have cladding according to table 9.
The vapour barrier shall have a maximum vapour transmission ratio of 1,75 perm.
NOTE 1 perm = 1 ng/s ∙ Pa - 1 ∙ m - 2.
The barrier shall be a fire-retardant, non-toxic, factory-applied cover, reinforced by glass-fibre- threaded tissue.
All thermal insulation thickness shall be determined in accordance with the calculations in ISO 12241. All cladding shall be provided in accordance with Table 9.
Table 9: Cladding requirement Insulation Duct Cladding Location Material Thickness mm With outer With outer diameter diameter ≤ 1200 mm > 1200 mm Thermal insulation External Stainless steel 0,5 0,7 Fire insulation Internal and Stainless steel 0,5 0,7 external Note : Stainless steel cladding should conform to EN 10088 (all parts) [21] material No. 1.4401 UNS S31600, 2B finish.
6.5.3 Typical insulation ducting
Figure 3: Typical insulation for rectangular ducting is shown below.
Neptune Energy Netherlands B.V. Specification 541 rev. 1 Page 26 of 29 6.6 TESTING
6.6.1 Test points
Test points shall be provided for making flow, temperature and pressure measurements. The corresponding bosses shall be large enough to allow the use of Pitot tubes or similar equipment. Each boss shall be provided with a plug and a retaining chain.
6.6.2 Testing requirements
For low pressure ducts, no particular testing will be required after verification of workmanship at erection time and during system tests.
For high pressure ducts, before installation of heat insulation, Contractor shall carry out a tightness test in accordance with the procedure which shall be submitted to Company for review (only a method in accordance with an official standard shall be submitted).
Heat insulation shall only be applied to the ducts after successful leak testing and with approval of Company.
Test holes for measurements in order to allow adjustment and verify performance of the installations. The balance of the circuits must be determined by commissioning.
Neptune Energy Netherlands B.V. Specification 541 rev. 1 Page 27 of 29 7.0 PIPING
7.1 DESIGN
Piping design shall be in compliance with Company Standard 501. Piping installation shall be in accordance with Company Specification 502. Design and construction are subject to Companies approval.
All equipment with condensate drainage shall be connected to piping with a siphon. The condensate drainage shall be connected to the nearest sewer. In case of clogging drainage needs to be accessible for cleaning purposes.
7.2 MATERIAL SPECIFICATIONS
All piping materials shall comply with the requirements of Company Specification 503 - Pipe, Fitting and Valve - and related documents.
7.3 INSULATION
Insulation shall be in compliance with Company Standard 518. Insulation activities shall not start before the heating installation is tested on leak tightness and approved by Company.
To avoid damage due to frost all outside condensate drainages shall be provided with heat tracing.
7.4 BALANCING VALVES
Balancing valves with measurements probes shall be installed on return lines of all consumers or group of consumers. The balancing valves shall have a locking device for the balanced position and the possibility to be closed and reopened to the balanced position.
7.5 SHUT-OFF VALVES
Shut-off valves shall be installed in piping just before and after installation components to create easy exchange facilities.
Neptune Energy Netherlands B.V. Specification 541 rev. 1 Page 28 of 29 8.0 PREFERRED SUPPLIERS LIST
All materials shall be supplied in accordance with the preferred supplier list. Contractor shall specify the type/model, material and other technical data of the applicable equipment. Other type/manufacturer shall not be used without written approval from Company.
Material Manufacturer Type
Holland Heating / Air Handling Units Dutchblower / Monair (Robatherm) Chiller Units Carrier / APAC / GEA Heat Pumps Mitsubishi Electric Fire damper Wozair MFD EX Max 15 BF Fire damper actuator Schischek Power open / Spring return. Including limit switches Pressure relief damper Wozair PRD Sound attenuator Wozair Balancing damper Wozair Non return dampers Wozair NRD Modulating dampers Wozair Actuator for modulating Schischek Ex max 5.10 F/VA dampers Supply grills Wozair or Halton Extract grils Wozair or Halton DCF, Vane type separator followed Mist eliminator Munters or Halton by extended surface panel filter/coalesce class G4 Chemstar Motors EExd Loher II 2 G Eex de IIC T4 See datasheet. Differential Pressure switch CCS or Dwyer DUAL Snap or 1950G-1 Temperature switch CCS -
See also for electrical- and instrumentation supplier list see company standard 610, chapter 15.
Neptune Energy Netherlands B.V. Specification 541 rev. 1 Page 29 of 29