Hvac Renovations to the Law Enforcement Center 200 West Oglethorpe Blvd
ADDENDUM No. 2
HVAC RENOVATIONS TO THE LAW ENFORCEMENT CENTER 200 WEST OGLETHORPE BLVD. ALBANY, GEORGIA Bid Reference #18-030
April 10, 2018
The Drawings and Specifications entitled HVAC RENOVATIONS TO THE LAW ENFORCEMENT CENTER 200 WEST OGLETHORPE BLVD. ALBANY, GEORGIA Bid Reference #18-030 dated February 15, 2018, as prepared by Butler Engineering, Inc., are hereby amended in the following particulars:
SPECIFICATIONS: A. Section OC, Bid Form: Delete entirely and replace with the attached Section OC, Bid Form, revised April 9, 2018.
B. All Division 15 specifications, at all locations where reference is made to specification section and/or division 23, replace with 15. Also, at all locations where reference is made to specification section and/or division 26, replace with 16.
C. Section 15000-MECHANICAL GENERAL PROVISIONS 1. Page 2, paragraph 1.4.B, mechanical firm’s proficiency, replace the sentence entirely with the following sentence: “The firm's proficiency in the installation, start-up, adjustment and maintenance of air conditioning systems shall have been demonstrated by the successful performance of work as specified herein on at least FIVE systems with ducted air distribution and chilled and hot water piping of 170 tons capacity or greater, incremental units excluded. The firm shall have trained personnel, instruments, tools and equipment to perform the installation and maintenance service specified. The firm shall have been in business performing services as specified herein for at least TEN years.
2. Page 3, paragraph 1.6, submittals, sub-paragraph 9, Replace entirely with the following paragraph: “Coordination Drawings: Prepare coordination drawings to a scale of 1/2" = 1'-0" or larger clearly indicating information as follows: a. Chiller positioning adjacent to existing equipment for clearance coordination.
D. Section 15005-PENETRATION FIRE STOPPING Add complete section. See attached.
E. Section 15010-MECHANICAL COORDINATION 1. Page 1 a. Add Paragraph as follows: “2.1.D Contractor shall provide field verification and coordination to ensure that the selected chilled water coils for existing air handlers are designed and sized properly to fit existing equipment coil sections, and will perform properly according to equipment manufacturer requirements. Field verification and coordination shall also ensure physical clearances with reference to selected coils entering building at each floor and transported to each mechanical room location, as well as installation into existing air handlers.”
F. Section 15015-MECHANICAL SUBMITTALS 1. Page 1, paragraph 1.02.E.1 and 1.02.E.2, change the words “no exceptions taken” to “REVIEWED” and “make corrections noted” to “REVIEWED” respectively.
G. Section 15510-HYDRINIC PIPING
1. Page 14, add the following paragraph:
“2.16 CHILLED WATER PIPING INSIDE BUILDING A. Acceptable Manufacturers: Victaulic, Gruvlok, or pre-bid approved equal. B. Flexible Couplings and Fittings: 1. Coupling housing shall be zero flex rigid type coupling with angled bolt pad design. Similar to Victaulic Type 07. Flexible couplings shall be used only when expansion contraction, deflection, or noise and vibration is to be dampened. Flexible coupling shall be similar to Victaulic Type 77. Coupling gasket shall be similar to Victaulic’s Grade E molded synthetic rubber, Grade No. R615BZ. Flushseal gasket configuration on all applications. Coupling bolts shall be oval neck track head type with hexagonal heavy nuts in accordance with ASTM A183. 2. Fittings used with pipe couplings shall be fabricated of malleable iron castings in accordance with ASTM A47. Where malleable fitting pattern is not available, fittings fabricated from Schedule 40 steel pipe or standard wall seamless welding fittings with grooved ends may be used. Elbows on pumped systems shall be long radius type. C. Service: 1. Chilled water inside building.”
H. Section 15773-SPLIT SYSTEM HEAT PUMPS 1. Page 1, paragraph 2.01.B, omit the following sentence: “Unit shall be provided with factory disconnect wired to de-energize the motor for servicing, etc.”
2. Page 2, paragraph 2.03, change the section reference from 15030 to 15300.
I. Section 15778-SPLIT SYSTEM AIR CONDITIONERS 1. Page 7, paragraph 2.07.A, omit entirely and replace with the following: “Refer to section 15300.”
J. Section 15850-AIR COOLED CHILLER 1. Page 11, paragraph 3.2.A.2, change to the following: “Provide number of days of service as required.” 2. Page 3, add the following paragraph: “CHILLER WARRANTY-SHALL BE COMPLETE UNIT DUAL PUMP HYDRONIC SYSTEM YEAR 2-10 PARTS AND LABOR. “
K. Section 15890-DUCTWORK 1. Omit section entirely and replace with attached section 15890-DUCTWORK
DRAWINGS A. Sheet C: Add the following sheet to the List of Drawings: “M1.4 – LARGE SCALE PLANS”
B. Sheet M0.2
1. At Existing air handling units schedule and new air cooled chiller schedule, modify per attached drawing M0.2, revision 1.
C. Sheet M1.1
1. At First Floor Plan – HVAC, modify per attached drawing M1.1, revision 1.
Modifications include but are not limited to the following. Coordinate with clouded areas on revision 1 dwg:
a. At corridor to north of main mech. Room, modify SA duct sizes. b. At Fittness room, modify existing exhaust duct modification to not terminate in RA plenum as orig. indicated by numbered note “43”. Also, add new exhaust grille and 12:x12” duct to tie into exist. 12”x12” osa duct which orig. served AHU for fitness room. Disconnect exist. Osa duct in corridor and terminate new RA duct from fitness room in RA plenum. c. At locker room areas: - modify grille tags and cfm quantities. - At added transfer loops to corridor, omit added grilles at corridor side. - relocate added exhaust grilles to location of existing SA grille. Modify existing exhaust duct to accommodate. -At womens toilet area, replace existing 10” exhaust duct downstream of existing “442” CFM grille, with a 12” exhaust duct. d. At provisions for temporary cooling information, at note 1, add the words “per floor” between the words 7 days and for complete. Also, at note 2, add the words “and generator” between the words chiller and for operation.
END OF ADDENDUM NO. 2 (NARRATIVE PORTION, SEE FOLLWING ATTACHMENTS) Revised: April 9, 2018 BID FORM OC - 1
CONSTRUCTION: HVAC RENOVATIONS TO THE LAW ENFORCEMENT CENTER, 200 WEST OGLETHORPE BLVD., ALBANY, GEORGIA
Bid Ref. #18-030
BID OF
DATE
TO: City of Albany Procurement Division 222 Pine Avenue, Suite 260 Albany, Georgia 31701.
Bidders:
Having carefully examined the Specifications Divisions 1 through 16, all dated February 15, 2018, and all Contract Documents including Addenda, as prepared by BUTLER ENGINEERING, INC., as well as having carefully examined the site and conditions affecting the work, the Undersigned proposes to furnish all labor, materials, equipment and services required for construction of HVAC RENOVATIONS TO THE LAW ENFORCEMENT CENTER, 200 WEST OGLETHORPE BLVD., ALBANY, GEORGIA, Bid Ref. #18-030, in strict accordance with the Contract Documents for the sum of:
BASE BID:
______DOLLARS ($ ) which sum is hereinafter called the Base Bid.
The following Alternates, if accepted, will be incorporated as deductions to the Base Bid. The undersigned proposes that should the following Alternates be accepted and be incorporated in the Contract, the Base Bid will be altered as follows:
Alternate No. 1: Delete replacing the existing Direct Expansion Split Systems - which serve the Garage and Data Room - with new systems of size to match existing as scheduled and specified. Deduct the sum of:
______DOLLARS ($______).
Page 1 of 3 Revised: April 9, 2018 BID FORM OC - 2
Alternate No. 2: The Owner may select only one of the following options:
Alternate No. 2a: Delete Chiller Factory Warranty as included in Base Bid and substitute the following Chiller Factory Warranty:
Complete Chiller Unit (with dual pump hydronic system): 2-5 years parts and labor. Deduct the sum of:
______DOLLARS ($______).
Alternate No. 2b: Delete Chiller Factory Warranty as included in Base Bid and substitute the following Chiller Factory Warranty:
Compressor: 2-5 years parts and labor. Deduct the sum of:
______DOLLARS ($______).
In case he be notified in writing by mail, telegraph, or delivery of the acceptance of this Bid within sixty (60) days after time set for opening of bids, the Undersigned agrees to execute within ten (10) days a Contract (Standard Form of Agreement Between Owner and Contractor the Basis of Payment is a Stipulated Sum, AIA Document A101-2007 ) for the work for the above-stated compensation and at the same time to furnish and deliver to the Owner performance and labor and material payment bonds each in amount equal to 100% of the Contract Sum.
Enclosed herewith is a Bid Bond in the amount of
DOLLARS ($ ), (being not less than five percent (5%) of the Base Bid.) The Undersigned agrees that the above stated amount is the proper measure of liquidated damages which the Owner will sustain by the failure of the Undersigned to execute the Contract and to furnish performance and labor and material payment bonds, the obligation of the bid bond will remain in full force and effect and the money payable thereon shall be paid into funds of the Owner as liquidated damages for such failure; otherwise, the obligation of the bond will be null and void.
Certification of Bidder’s Experience and Qualifications: The undersigned bidder certifies that he is, at the time of bidding, and shall be, throughout the period of the contract, licensed by the State of Georgia to do the type of work required under terms of the Contract Documents. Bidder further certifies that he is skilled and regularly engaged in the general class and type of work called for in the Contract Documents. The bidder represents that he is competent, knowledgeable and has special skills on the nature, extent, and inherent conditions of the work to be performed. Bidder further acknowledges that there are certain peculiar and inherent conditions existent in the construction of the particular facilities, which may create, during the construction
Page 2 of 3 Revised: April 9, 2018 BID FORM OC - 3 program, unusual or peculiar unsafe conditions hazardous to persons and property. Bidder expressly acknowledges that he has the skill and experience to foresee and to adopt protective measures to adequately and safely perform the construction work with respect to such hazards.
Respectfully submitted,
NAME ADDRESS ______BY TITLE
ACKNOWLEDGMENT IS MADE OF RECEIPT OF THE FOLLOWING ADDENDA, IF ANY:
ADDENDUM NO. , DATED ADDENDUM NO. , DATED ADDENDUM NO. , DATED ADDENDUM NO. , DATED ADDENDUM NO. , DATED
Page 3 of 3 HVAC RENOVATIONS TO THE LAW ENFORCEMENT CENTER 200 W OGLETHORPE BLVD. ALBANY, GEORGIA Bid Reference #18-030
SECTION 15005 PENETRATION FIRESTOPPING
PART 1 - GENERAL
1.01 RELATED DOCUMENTS
A. Drawings and general provisions of Contract, including General and Supplementary Conditions and Division-1 Specification Section, apply to work specified in this section.
1.02 DEFINITIONS
A. Firestopping: Material or combination of materials used to retain integrity of fire-rated construction by maintaining an effective barrier against the spread of flame, smoke, and hot gases through penetrations in fire rated wall and floor assemblies.
1.03 GENERAL DESCRIPTION OF THE WORK OF THIS SECTION
Only tested firestop systems shall be used in specific locations as follows:
A. Penetrations for the passage of duct, cable, cable tray, conduit, piping, electrical busways and raceways through fire-rated vertical barriers (walls and partitions), horizontal barriers (floor/ceiling assemblies), and vertical service shaft walls and partitions.
B. Blank openings through fire-rated vertical barriers (walls and partitions), horizontal barriers (floor/ceiling assemblies), and vertical service shaft walls and partitions.
C. Openings and penetrations in fire-rated partitions or walls containing fire doors.
D. Openings around structural members which penetrate floors or walls.
1.04 RELATED WORK OF OTHER SECTIONS
A. Coordinate work of this section with work of other sections as required to properly execute the work and as necessary to maintain satisfactory progress of the work of other sections, including:
1. Section 03300 - Cast-In-Place Concrete 2. Section 07900 - Joint Sealers 5. Section 09250 - Gypsum Drywall 6. Section 15500 - Fire Suppression 9. Section 15400 - Plumbing 10. All Division 15 Sections- Heating, Ventilating, and Air Conditioning 11. All Division 16 Sections - Electrical
15005 - 1 HVAC RENOVATIONS TO THE LAW ENFORCEMENT CENTER 200 W OGLETHORPE BLVD. ALBANY, GEORGIA Bid Reference #18-030
1.05 REFERENCES
A. Test Requirements: ASTM E 814, "Standard Method of Fire Tests of Through Penetration Fire Stops"
B. Test Requirements: UL 1479, “Fire Tests of Through-Penetration Firestops”
C. Underwriters Laboratories (UL) of Northbrook, IL publishes tested systems in their "FIRE RESISTANCE DIRECTORY" that is updated annually.
1. UL Fire Resistance Directory: a. Firestop Devices (XHJI) b. Fire Resistance Ratings (BXRH) c. Through-Penetration Firestop Systems (XHEZ) d. Fill, Voids, or Cavity Material (XHHW) e. Forming Materials (XHKU)
D. International Firestop Council Guidelines for Evaluating Firestop Systems Engineering Judgments
E. ASTM E 84, Standard Test Method for Surface Burning Characteristics of Building Materials.
F. Inspection Requirements: ASTM E 2174, “Standard Practice for On-site Inspection of Installed Fire Stops.”
G. All major building codes: ICBO, SBCCI, BOCA, IBC and Building Code of the City of Albany, Georgia.
H. NFPA 101 - Life Safety Code
I. NFPA 70 - National Electric Code
1.06 QUALITY ASSURANCE
A. Fire-Test-Response Characteristics: Provide through-penetration fire stop systems that comply with specified requirements of tested systems.
B. Firestop System installation must meet requirements of ASTM E 814, UL 1479 or UL 2079 tested assemblies that provide a fire rating equal to that of construction being penetrated.
C. Proposed firestop materials and methods shall conform to applicable governing codes having local jurisdiction.
D. Firestop Systems do not reestablish the structural integrity of load bearing partitions/assemblies, or support live loads and traffic. Installer shall consult the structural engineer prior to penetrating any load bearing assembly.
E. For those firestop applications that exist for which no qualified tested system is available through a manufacturer, an engineering judgment derived from similar qualified tested
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system designs or other tests will be submitted to local authorities having jurisdiction for their review and approval prior to installation. Engineering judgment documents must follow requirements set forth by the International Firestop Council.
1.07 SUBMITTALS
A. Submit Product Data: Manufacturer's specifications and technical data for each material including the composition and limitations, documentation of qualified firestop systems to be used and manufacturer's installation instructions to comply with Section 01300.
B. Manufacturer's engineering judgment identification number and drawing details when no qualified tested system is available for an application. Engineering judgment must include both project name and contractor’s name who will install firestop system as described in document.
D. Submit material safety data sheets provided with product delivered to job-site.
1.08 INSTALLER QUALIFICATIONS
A. Installer of fire stopping systems must be certified, licensed, or otherwise qualified by the firestopping manufacturer as having been provided the necessary training to install manufacturer’s products per specified requirements. A supplier’s willingness to sell its firestopping products to the Contractor or to an Installer engaged by the Contractor does not in itself confer qualification on the buyer.
B. The work is to be installed by a contractor with at least one of the following qualifications:
FM 4991 Approved Contractor UL Approved Contractor 3M or Hilti Accredited Fire Stop Specialty Contractor
D. Firm with not less than 5 years experience with fire stop installation.
1.09 DELIVERY, STORAGE, AND HANDLING
A. Deliver materials undamaged in manufacturer's clearly labeled, unopened containers, identified with brand, type, and UL label where applicable.
B. Coordinate delivery of materials with scheduled installation date to allow minimum storage time at job-site.
C. Store materials under cover and protect from weather and damage in compliance with manufacturer's requirements, including temperature restrictions.
D. Comply with recommended procedures, precautions or remedies described in material safety data sheets as applicable.
E. Do not use damaged or expired materials.
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1.10 PROJECT CONDITIONS
A. Do not use materials that contain flammable solvents.
B. Schedule installation of firestopping after completion of penetrating item installation but prior to covering or concealing of openings.
C. Verify existing conditions and substrates before starting work. Correct unsatisfactory conditions before proceeding.
D. Weather conditions: Do not proceed with installation of firestop materials when temperatures exceed the manufacturer's recommended limitations for installation printed on product label and product data sheet.
E. During installation, provide masking and drop cloths to prevent firestopping materials from contaminating any adjacent surfaces.
PART 2 - PRODUCTS
2.01 FIRESTOPPING, GENERAL
A. Provide firestopping composed of components that are compatible with each other, the substrates forming openings, and the items, if any, penetrating the firestopping under conditions of service and application, as demonstrated by the firestopping manufacturer based on testing and field experience.
B. Provide components for each firestopping system that are needed to install fill material. Use only components specified by the firestopping manufacturer and approved by the qualified testing agency for the designated fire-resistance-rated systems.
C. Firestopping Materials are either “cast-in-place” (integral with concrete placement) or “post installed.” Provide cast-in-place firestop devices prior to concrete placement.
2.02 ACCEPTABLE MANUFACTURERS
A. Subject to compliance with through penetration firestop systems (XHEZ) listed in Volume II of the UL Fire Resistance Directory, provide products of the following manufacturer as identified below:
1. Hilti Fire Protection Products.
2. 3M Fire Protection Products.
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2.03 MATERIALS
A. Use only firestop products that have been UL 1479 or ASTM E 814 tested for specific fire- rated construction conditions conforming to construction assembly type, penetrating item type, annular space requirements, and fire-rating involved for each separate instance.
B. Pre-installed firestop devices for use with noncombustible and combustible pipes (closed and open systems), conduit, and/or cable bundles penetrating concrete floors and/or gypsum walls, the following products are acceptable:
1. Hilti CP 680-P Cast-In Place Firestop Device a. Add Aerator adaptor when used in conjunction with aerator (“sovent”) system. 2. Hilti CP 681 Tub Box Kit for use with tub installations. 3. Hilti CP 680-M Cast-In Place Firestop Device for use with noncombustible penetrants. 4. Hilti CP 653 Speed Sleeve for use with cable penetrations. 5. Hilti CFS-DID Firestop Drop-In Device for use with noncombustible and combustible penetrants. 6. Hilti CFS-BL Firestop Block
C. Sealants, caulking materials, or foams for use with non-combustible items including steel pipe, copper pipe, rigid steel conduit and electrical metallic tubing (EMT), the following products are acceptable:
1. Hilti FS-ONE Intumescent Firestop Sealant 2. Hilti CP 604 Self-leveling Firestop Sealant 3. Hilti CP 620 Fire Foam 4. Hilti CP606 Flexible Firestop Sealant 5. Hilti CP 601s Elastomeric Firestop Sealant
D. Sealants or caulking materials for use with sheet metal ducts, the following products are acceptable:
1. Hilti CP 601s Elastomeric Firestop Sealant 2. Hilti CP 606 Flexible Firestop Sealant 3. Hilti FS-ONE Intumescent Firestop Sealant
E. Intumescent sealants, caulking materials for use with combustible items (penetrants consumed by high heat and flame) including insulated metal pipe, PVC jacketed, flexible cable or cable bundles and plastic pipe, the following products are acceptable:
1. Hilti FS-ONE Intumescent Firestop Sealant
F. Foams, intumescent sealants, or caulking materials for use with flexible cable or cable bundles, the following products are acceptable:
1. Hilti FS-ONE Intumescent Firestop Sealant 2. Hilti CP 620 Fire Foam 3. Hilti CP 601s Elastomeric Firestop Sealant 4. Hilti CP 606 Flexible Firestop Sealant
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G. Non-curing, re-penetrable, intumescent putty or foam materials for use with flexible cable or cable bundles, the following products are acceptable: 1. Hilti CP 618 Firestop Putty Stick 2. Hilti CFS-PL Firestop Plug
H. Wall opening protective materials for use with U.L. listed metallic and specified nonmetallic outlet boxes, the following products are acceptable:
1. Hilti CP 617 Firestop Putty Pad 2. Hilti Firestop Box Insert
I. Firestop collar or wrap devices attached to assembly around combustible plastic pipe (closed and open piping systems), the following products are acceptable:
1. Hilti CP 643N Firestop Collar 2. Hilti CP 644 Firestop Collar 3. Hilti CP 648E/648S Wrap Strips
J. Materials used for large openings and complex penetrations made to accommodate cable trays and bundles, multiple steel and copper pipes, electrical busways in raceways, the following products are acceptable:
1. Hilti CP 637 Firestop Mortar 2. Hilti CFS-BL Firestop Block 3. Hilti CP 620 Fire Foam 4. Hilti CP 675T Firestop Board
K. Non curing, re-penetrable materials used for large openings and complex penetrations made to accommodate cable trays and bundles, multiple steel and copper pipes, electrical busways in raceways, the following products are acceptable:
1. Hilti CFS-BL Firestop Block 2. Hilti CP 675T Firestop Board
L. For blank openings made in fire-rated wall or floor assemblies, where future penetration of pipes, conduits, or cables is expected, the following products are acceptable:
1. Hilti CFS-BL Firestop Block 2. Hilti CFS-PL Firestop Plug
M. Provide a firestop system with a "F" Rating as determined by UL 1479 or ASTM E 814 which is equal to the time rating of construction being penetrated.
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PART 3 - EXECUTION
3.01 PREPARATION
A. Verification of Conditions: Examine areas and conditions under which work is to be performed and identify conditions detrimental to proper or timely completion.
1. Verify penetrations are properly sized and in suitable condition for application of materials.
2. Surfaces to which firestop materials will be applied shall be free of dirt, grease, oil, rust, laitance, release agents, water repellents, and any other substances that may affect proper adhesion.
3. Provide masking and temporary covering to prevent soiling of adjacent surfaces by firestopping materials.
4. Comply with manufacturer's recommendations for temperature and humidity conditions before, during and after installation of firestopping.
5. Do not proceed until unsatisfactory conditions have been corrected.
3.02 COORDINATION
A. Coordinate construction of openings, penetrations and construction joints to ensure that the fire stop systems are installed according to specified requirements.
B. Coordinate sizing of sleeves, openings, core-drilled holes, or cut openings to accommodate through-penetration fire stop systems. Coordinate construction and sizing of joints to ensure that fire-resistive joint systems are installed according to specified requirements.
C. Coordinate fire stopping with other trades so that obstructions are not placed in the way prior to the installation of the fire stop systems.
D. Do not cover up through-penetration fire stop and joint system installations that will become concealed behind other construction until each installation has been examined by the building inspector, per requirements of Section 109, International Building Code 2000, ed.
3.03 INSTALLATION
A. Regulatory Requirements: Install firestop materials in accordance with UL Fire Resistance Directory.
B. Manufacturer's Instructions: Comply with manufacturer's instructions for installation of through-penetration materials.
1. Seal all holes or voids made by penetrations to ensure an air and water resistant seal.
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2. Consult with mechanical engineer, project manager, and damper manufacturer prior to installation of UL firestop systems that might hamper the performance of fire dampers as it pertains to duct work. 3. Protect materials from damage on surfaces subjected to traffic.
3.04 FIELD QUALITY CONTROL
A. Examine sealed penetration areas to ensure proper installation before concealing or enclosing areas.
B. Keep areas of work accessible until inspection by applicable code authorities.
C. Inspection of through-penetration firestopping shall be performed in accordance with ASTM E 2174, “Standard Practice for On-Site Inspection of Installed Fire Stops” or other recognized standard.
M. Perform under this section patching and repairing of firestopping caused by cutting or penetrating of existing firestop systems already installed by other trades.
E. Manufacturer’s Field Services: During Installation, provide periodic destructive testing inspections to assure proper installation/application. After installation is complete, submit findings in writing indicating whether or not the installation of the tested system identified was installed correctly.
3.05 IDENTIFICATION & DOCUMENTATION
A. The firestop contractor is to supply documentation for each single application addressed. This documentation is to identify each penetration and joint location on the entire project. Identify through-penetration firestop systems with pressure-sensitive, self-adhesive, preprinted vinyl labels. Attach labels permanently to surfaces of penetrated construction on both sides of each firestop system installation where labels will be visible to anyone seeking to remove penetrating items or firestop systems. Include the following information on labels:
1. The words: "Warning -Through Penetration Firestop System-Do Not Disturb. Notify Building Management of Any Damage." 2. Contractor's Name, address, and phone number. 3. Through-Penetration firestop system designation of applicable testing and inspecting agency. 4. Date of Installation. 5. Through-Penetration firestop system manufacturer's name. 6. Installer's Name.
3.05 ADJUSTING AND CLEANING
A. Remove equipment, materials and debris, leaving area in undamaged, clean condition.
B. Clean all surfaces adjacent to sealed holes and joints to be free of excess firestop materials and soiling as work progresses.
END OF SECTION
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DIVISION 15 - MECHANICAL
SECTION 15890 - DUCTWORK
PART 1 GENERAL
1.1 SECTION INCLUDES BUT IS NOT LIMITED TO
A. Metal ductwork.
B. Nonmetal ductwork.
C. Casing and plenums.
1.2 REFERENCES
A. ASTM A 36 - Structural Steel.
B. ASTM A 90 - Weight of Coating on Zinc-Coated (Galvanized) Iron or Steel Articles.
C. ASTM A 167 - Stainless and Heat-Resisting Chromium-Nickel Steel Plate, Sheet, and Strip.
D. ASTM A 366 - Steel, Sheet, Carbon, Cold Rolled, Commercial Quality.
E. ASTM A 480 - General Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet, and Strip. F. ASTM A 525 - General Requirements for Steel Sheet, Zinc- Coated (Galvanized) by the Hot-Dip Process.
G. ASTM A 527 - Steel Sheet, Zinc-Coated (Galvanized) by Hot-Dip Process, Lock Forming Quality.
H. ASTM A 568 - Steel, Sheet, Carbon, and High-Strength, Low-Alloy, Hot-Rolled and Cold-Rolled.
I. ASTM A 569 - Steel, Carbon (0.15 Maximum, Percent), Hot-Rolled Sheet and Strip, Commercial Quality.
J. ASTM B209 - Aluminum and Aluminum-Alloy Sheet and Plate.
K. AWS D9.1 - Welding of Sheet Metal.
L. [NAIMA - Fibrous Glass Duct Construction Standards]
M. NFPA 90A - Installation of Air Conditioning and Ventilating Systems.
15890 - 1
HVAC RENOVATIONS TO THE LAW ENFORCEMENT CENTER 200W OGLETHORPE BLVD. ALBANY, GEORGIA Bid Reference #18-030
N. NFPA 90B - Installation of Warm Air Heating and Air Conditioning Systems.
O. NFPA 91 - Installation of Blower and Exhaust Systems for Dust, Stock and Vapor Removal or Conveying.
P. NFPA 96 - Installation of Equipment for the Removal of Smoke and Grease-Laden Vapors from Commercial Cooking Equipment.
Q. SMACNA - HVAC Air Duct Leakage Test Manual.
R. SMACNA - HVAC Duct Construction Standards - Metal and Flexible.
S. UL 181 - Factory-Made Air Ducts and Connectors.
1.3 PERFORMANCE REQUIREMENTS
A. No variation of duct configuration or sizes permitted except by written permission. Size round ducts installed in place of rectangular ducts in accordance with ASHRAE table of equivalent rectangular and round ducts.
1.4 QUALITY ASSURANCE
A. Perform Work in accordance with SMACNA - HVAC Duct Construction Standards - Metal and Flexible 1995 Edition. This shall be subsequently referred to as the SMACNA Manual. All ductwork shall comply with all local, state, and federal code requirements.
B. Ductwork shop drawings must be properly submitted and reviewed. If deviations from the plans and specifications made without prior approval are found in installed work, the contractor shall, at the contractor's expense, make the applicable changes to comply with these specifications.
C. At the discretion of the engineer, sheet metal gauges, and reinforcing may be checked at various times to verify all duct construction is in compliance.
D. Manufacturer’s Certificate: Provide manufacturer’s certification that installation and construction of glass fiber ductwork meets or exceeds NAIMA and manufacturer’s standards.
E. Duct leakage test report: Provide duct leakage test report. Indicate pressure tests performed. Include date, section tested, test pressure, and leakage rate, following SMACNA HVAC Air Duct Leakage Test Manual.
1.5 QUALIFICATIONS
A. Manufacturer: Company specializing in manufacturing the Products specified in this section with minimum three years documented experience.
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HVAC RENOVATIONS TO THE LAW ENFORCEMENT CENTER 200W OGLETHORPE BLVD. ALBANY, GEORGIA Bid Reference #18-030
B. Installer: Company specializing in performing the work of this section with minimum three years documented experience.
1.6 REGULATORY REQUIREMENTS
A. Construct ductwork to NFPA 90A and NFPA 90B and NFPA 96 standards.
1.7 ENVIRONMENTAL REQUIREMENTS
A. Do not install duct sealants when temperatures are less than those recommended by sealant manufacturers.
B. Maintain temperatures during and after installation of duct sealants.
1.8 DEFINITIONS Medium pressure ductwork includes: 1. All duct risers enclosed in shafts. 2. All exhaust ductwork connected to fans with scheduled static pressure exceeding 2" water column. 3. All supply ductwork upstream of airflow control (or VAV) terminals or reheat coils. 4. Other ductwork noted or specified as medium pressure construction. Low pressure ductwork includes: 5. All galvanized ductwork downstream of air terminals and reheat coils, horizontal toilet exhaust duct, and ducts not included under medium pressure ductwork above. Duct pressure classification shall be as specified herein and not as recommended in SMACNA publications.
PART 2 PRODUCTS
2.1 MANUFACTURERS
A. Manufacturers: Subject to compliance with requirements, manufacturers which may be incorporated in the work are as listed in the following paragraphs:
B. Single manufacturer and model requirements: All like products shall be of one manufacturer and model number (I.E. all insulated flexible duct shall be from one manufacturer Etc.).
2.2 MATERIALS
A. Galvanized Steel Ducts: ASTM A525 and ASTM A527 galvanized steel sheet, lock-forming quality. All ducts shall be constructed with galvanized steel having G90 or better zinc coating in conformance with ASTM A90.
B. Steel Ducts: ASTM A569 or A568.
C. Aluminum Ducts: ASTM B209; aluminum sheet, alloy 3003-H14. Aluminum 15890 - 3
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Connectors and Bar Stock: Alloy 6061- T6 or of equivalent strength.
D. Fasteners: Rivets, bolts, or sheet metal screws.
E. Sealant:
1. Manufacturers:
a. Ductmate Model PROseal.
b. Foster Model 95-90.
c. RCD Corporation #6 Mastic.
d. Substitutions are permitted per Section 15010 requirements.
2. ASTM G-21 and G-22 anti-fungal and anti-bacterial.
3. UL 181A listed.
4. Non-hardening, water resistant, fire resistive, compatible with mating materials; liquid used alone or with tape, or heavy mastic.
F. Hanger Rod: ASTM A36; steel, galvanized; threaded both ends, threaded one end, or continuously threaded.
G. Hanger Inserts: MSS Type 18, galvanized steel case, steel shell and expander plug for threaded connection with lateral adjustment, top slot for reinforcing rods, lugs for attaching to forms. Size to suit hanger rod.
H. Sleeves for round and rectangular duct: Galvanized steel.
2.3 DUCTWORK FABRICATION
A. Fabricate and support in accordance with SMACNA HVAC Duct Construction Standards - Metal and Flexible, and as indicated. Provide duct material, gages, reinforcing, and sealing for operating pressures indicated.
B. Ductmate or W.D.C.I proprietary duct connection systems will be accepted. Ducts constructed using these systems will refer to the manufacturer's published standard for sheet gauge, intermediate reinforcement size and spacing, and joint reinforcements.
C. Longitudinal seams shall be Pittsburgh lock sealed as required by seal class.
D. Round duct shall be spiral seam construction only. Gauges and fittings shall be in accordance with the SMACNA Duct Construction Standard. Joints up to 20 15890 - 4
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inches shall be interior slip couplings beaded at center, mechanically fastened to ducts and sealed. Joints 21 to 72 inches shall be three piece, gasketed, flanged joints consisting of 2 internal flanges, and one external closure band.
E. Fabricate continuously welded round and oval duct fittings two gages heavier than duct gages indicated in SMACNA Standard. Joints shall be welded or Ductmate or W.D.C.I. Prime coat welded joints.
F. Construct T's, bends, and elbows with radius of not less than 1-1/2 times width of duct on centerline. Where not possible, provide single thickness turning vanes. Where mitered elbows are indicated on drawings use double thickness turning vanes.
G. Increase duct sizes gradually, not exceeding 15 degrees divergence wherever possible; maximum 30 degrees divergence upstream of equipment and 45 degrees convergence downstream.
H. Provide standard 45 degree lateral wye takeoffs unless otherwise indicated where 90 degree conical tee connections may be used. Adjustable splitter dampers, extractors, and scoops shall not be used.
2.4 MANUFACTURED DUCTWORK AND FITTINGS
A. Manufacture in accordance with SMACNA HVAC Duct Construction Standards - Metal and Flexible, and as indicated. Provide duct material, gages, reinforcing, and sealing for operating pressures indicated.
B. Non Insulated Flexible Ducts:
1. Manufacturers:
a. Thermaflex Model S-TL. b. Atco. c. Substitutions are permitted per Section 15010 requirements.
2. UL 181, Class 1, coated woven fiber glass supported by helically wound spring steel wire.
3. Pressure Rating: 10 inches WG positive and 1.0 inches WG ( negative.
4. Maximum Velocity: 6000 fpm .
5. Temperature Range: -10 degrees F to 160 degrees F.
6. Support: Thermaflex Model Saddle-Strap suspender with model Thermaclip hanger connection or approved equal.
C. Non-Insulated Metallic Flexible Ducts: 15890 - 5
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1. Manufacturers:
a. Kirk & Blum
b. Substitutions are permitted per Section 15010 requirements.
2. UL 181, Class 0, interlocking spiral of aluminum foil.
3. Pressure Rating: 8 inches WG positive or negative.
4. Maximum Velocity: 5000 fpm .
5. Temperature Range: -100 degrees F to 435 degrees F.
6. Support: Thermaflex Model Saddle-Strap suspender with model Thermaclip hanger connection or approved equal.
D. Low Pressure Insulated Flexible Ducts:
1. Manufacturers:
a. Thermaflex Model M-KF.
b. Substitutions are permitted per Section 15010 requirements.
2. UL 181 Class 1, two ply vinyl film liner supported by helically wound spring steel wire; fiberglass insulation; fiberglass reinforced aluminized vapor barrier film.
3. Thermal resistance R=6.0 BTU/hr/sq.ft./degree F @ 75F
4. Pressure Rating: 6 inches WG positive and 1/2 inch WG negative.
5. Maximum Velocity: 4000 fpm.
6. Temperature Range: -10 degrees F to 160 degrees F.
7. Support: Thermaflex Model Saddle-Strap suspender with model Thermaclip hanger connection or approved equal.
E. Medium Pressure Insulated Flexible Ducts:
1. Manufacturers:
a. Thermaflex Model M-KC.
b. Substitutions are permitted per Section 15010 requirements. 15890 - 6
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2. UL 181 Class 1, coated woven fiberglass liner supported by helically wound spring steel wire; fiberglass insulation; fiber glass reinforced aluminized vapor barrier film.
3. Thermal resistance R=4.2 BTU/hr/sq.ft./degree F @ 75F
4. Pressure Rating: 10 inches WG positive and 2 inch WG negative.
5. Maximum Velocity: 6000 fpm.
6. Temperature Range: -10 degrees F to 160 degrees F.
7. Support: Thermaflex Model Saddle-Strap suspender with model Thermaclip hanger connection or approved equal.
F. 45° Take Offs:
1. Manufacturers: Subject to compliance with requirements, manufacturers which may be incorporated in the work include, but are not limited to, the following:
a. Crown with damper and stand-off for insulation. b. Flexmaster with damper and stand-off for insulation.
2. Provide 45° Rectangular-to-Round take-off fittings constructed of the same material as the trunk duct and incorporating a volume damper (where required). The fitting shall also incorporate a damper standoff to accommodate blanket insulation.
G. Spin-In Take Offs:
1. Manufacturers:
a. Sheet Metal Connectors, Inc. Model Spin-In Collar W/Damp.
b. Substitutions are permitted per Section 15010 requirements. 2. Conical low loss spin-in duct take off for connection of flexible duct to galvanized trunk duct. Inlet diameter of fitting shall be a minimum of 1 inch larger than the outlet diameter of the fitting. Take off shall be constructed of 26 gauge galvanized steel and shall be equipped with adjustable balancing damper with screw-down quadrant. Exit of take off shall be beaded for connection of flexible duct. Take-offs with scoops shall not be used.
3. Maximum size used shall be 12 inch diameter.
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H. Single Wall Round Ducts:
1. Manufacturers:
a. United McGill Model Uni-Seal
b. Lindab Inc. Model Spirovent Spirosafe.
c. Impulse Air, Inc.
d. SEMCO
e. Substitutions are permitted per Section 15010 requirements.
2. Machine made from round spiral lockseam duct with light reinforcing corrugations; fittings manufactured of at least two gages heavier metal than duct. Transverse duct connection system shall be the duct manufacturer's standard recommended product for the pressure class.
3. Fittings United McGill Model Unit-Seal or Spiro Model Spirovent
I. Double Wall Insulated Round Ducts:
1. Manufacturers:
a. United McGill Model Acousti-K27
b. Impulse Air, Inc.
c. SEMCO
d. Substitutions are permitted per Section 15010 requirements.
2. Round spiral lockseam duct with galvanized steel outer wall, 1 inch thick fiberglass insulation, perforated galvanized steel inner wall; fitting with solid inner wall. Transverse duct connection system shall be the duct manufacturer's standard recommended product for the pressure class.
2.5 CASINGS
A. Fabricate casings in accordance with SMACNA HVAC Duct Construction Standards - Metal and Flexible and construct for operating pressures indicated.
B. Mount floor mounted casings on 6 inch high concrete curbs. At floor, rivet panels on 8 inch centers to angles. Where floors are acoustically insulated, provide liner of 18 gage galvanized expanded metal mesh supported at 12 inch centers, turned up 12 inches at sides with sheet metal shields.
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C. Reinforce door frames with steel angles tied to horizontal and vertical plenum supporting angles. Install hinged access doors where indicated or required for access to equipment for cleaning and inspection.
D. Fabricate acoustic casings with reinforcing turned inward. Provide 16 gage back facing and 22 gage perforated front facing with 3/32 inch diameter holes on 5/32 inch centers. Construct panels 3 inches thick packed with 4.5 lb/cu ft minimum glass fiber media, on inverted channels of 16 gage.
2.6 GASKET MATERIAL
A. Tremco 440, Ductmate 440, or equal, minimum 3/16" thick by 1/2" wide.
PART 3 EXECUTION
3.1 EXAMINATION:
A. Complete field measurement of existing conditions and thoroughly check for coordination/interference problems prior to fabrication of duct.
B. If problems are detected, notify engineer prior to fabrication of duct.
3.2 INSTALLATION
A. Install in accordance with manufacturer's instructions.
B. Install ducts in accordance with SMACNA HVAC Duct Construction Standards – latest edition. Metal and Flexible. 1. 3-4 inches (100 mm) w.g. class for herein specified medium pressure ductwork. 2. 2 inches or less (50 mm) w.g. class for herein specified low pressure ductwork. 3. At the Subcontractor’s option, round ducts may be substituted for rectangular ducts or rectangular ducts may be substituted for round ducts, providing that the substituted duct has a cross-sectional area of the original duct. As with other substitutions, the Subcontractor bears the responsibility for equivalency, fit, clearances, coordination, etc.
C. Duct Sizes are inside clear dimensions. For lined ducts, maintain sizes inside lining.
D. Provide openings in ductwork where required to accommodate thermometers and controllers. Provide pilot tube openings where required for testing of systems, complete with metal can with spring device or screw to ensure against air leakage. Where openings are provided in insulated ductwork, install insulation material inside a metal ring.
E. Locate ducts with sufficient space around equipment to allow normal operating 15890 - 9
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and maintenance activities.
F. Use double nuts and lock washers on threaded rod supports.
G. Tape joints of PVC coated metal ductwork with PVC tape.
H. Connect terminal units to supply ducts with one foot (300 mm) maximum length of flexible duct. Do not use flexible duct to change direction.
I. Connect diffusers or light troffer boots to low pressure ducts with 5 feet maximum length of flexible duct held in place with strap or clamp.
J. Connect flexible ducts to metal ducts with liquid adhesive plus tape.
K. Set plenum doors 6 to 12 inches above floor. Arrange door swings so that fan static pressure holds door in closed position.
L. During construction provide temporary closures of metal or taped polyethylene on open ductwork to prevent construction dust from entering ductwork system.
M. Seal all ducts in accordance with SMACNA HVAC Duct Construction Standards - Metal and Flexible, latest edition, seal class.
N. Do not install balancing dampers or spin-in take-offs with balancing dampers in branch ducts to VAV terminals.
O. Provide inserts for placement in concrete formwork.
P. Provide inserts for suspending hangers from reinforced concrete slabs and sides of reinforced concrete beams.
Q. Provide hooked rod to concrete reinforcement section for inserts carrying pipe over 4 inches.
R. Where concrete slabs form finished ceiling, locate inserts flush with slab surface.
S. Where inserts are omitted, drill through concrete slab from below and provide through-bolt with recessed square steel plate and nut above slab.
T. Set sleeves in position in formwork. Provide reinforcing around sleeves.
U. Size sleeves large enough to provide for continuous insulation wrapping.
V. Extend sleeves through floors one inch above finished floor level. Calk sleeves.
W. Where piping or ductwork penetrates floor, ceiling, or wall, close off space between pipe or duct and adjacent work with fire stopping insulation and calk.
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X. Where penetration is exposed provide finished closure over sleeve.
A. A random sample of 5 sections of duct each at least 20 feet in length shall be tested. The failure of one or more random test section shall make the contractor, at the engineers discretion, responsible for testing any and all sections the engineer deems necessary to ensure that the duct systems are of acceptable quality. B. All leak testing shall be witnessed by the engineer or representative of the engineer. The contractor shall give the engineer 72 hours notice prior to testing. Any testing not witnessed by the engineer or his representative, shall be considered invalid and will be redone.
C. The testing shall be performed as follows:
1. Perform testing in accordance with SMACNA HVAC Air Duct Leakage Test Manual.
2. Use a certified orifice tube for measuring the leakage.
3. Define section of system to be tested and blank off.
4. Determine the duct surface area of the section being tested.
5. Determine leakage class based on scheduled seal class and table 4-1 of the SMACNA HVAC Air Duct Leakage Test Manual.
6. Determine the allowable leakage (cfm) for the section being tested (duct surface area).
7. Pressurize to operating pressure and repair any significant or audible leaks.
8. Re-pressurize and measure leakage. 9. Repeat steps 7 and 8 until the leakage measured is less than the allowable.
10. Ducts requiring 10% or more resealing of seals required by the SMACNA HVAC Air Duct Leakage Test Manual shall have failed the test.
11. Class B and class C seal ducts requiring sealing in excess of the sealing required by the SMACNA HVAC Air Duct Leakage Test Manual shall have failed the test.
3.4 CLEANING
A. Clean duct system and force air at high velocity through duct to remove accumulated dust. To obtain sufficient air, clean half the system at a time. Protect 15890 - 11
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equipment which may be harmed by excessive dirt with temporary filters, or bypass during cleaning.
B. Clean duct systems with high power vacuum machines. Protect equipment which may be harmed by excessive dirt with filters, or bypass during cleaning. Provide adequate access into ductwork for cleaning purposes.
3.5 SCHEDULES
A. DUCTWORK MATERIAL SCHEDULE
SYSTEM MATERIAL
Supply Galvanized Steel
Return and Relief Galvanized Steel
General Exhaust Galvanized Steel
Outside Air Intake Galvanized Steel
END OF SECTION
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