RULES FOR CLASSIFICATION Ships Edition October 2015 Part 3 Hull Chapter 2 General arrangement design The content of this service document is the subject of intellectual property rights reserved by DNV GL AS ("DNV GL"). The user accepts that it is prohibited by anyone else but DNV GL and/or its licensees to offer and/or perform classification, certification and/or verification services, including the issuance of certificates and/or declarations of conformity, wholly or partly, on the basis of and/or pursuant to this document whether free of charge or chargeable, without DNV GL's prior written consent. DNV GL is not responsible for the consequences arising from any use of this document by others. The electronic pdf version of this document, available free of charge from http://www.dnvgl.com, is the officially binding version. DNV GL AS FOREWORD DNV GL rules for classification contain procedural and technical requirements related to obtaining and retaining a class certificate. The rules represent all requirements adopted by the Society as basis for classification. © DNV GL AS October 2015 Any comments may be sent by e-mail to [email protected] If any person suffers loss or damage which is proved to have been caused by any negligent act or omission of DNV GL, then DNV GL shall pay compensation to such person for his proved direct loss or damage. However, the compensation shall not exceed an amount equal to ten times the fee charged for the service in question, provided that the maximum compensation shall never exceed USD 2 million. In this provision "DNV GL" shall mean DNV GL AS, its direct and indirect owners as well as all its affiliates, subsidiaries, directors, officers, employees, agents and any other acting on behalf of DNV GL. CHANGES – CURRENT t n e r This is a new document. r u The rules enter into force 1 January 2016. c - s e g n a h C 2 r e t p a h C 3 t r a P Rules for classification: Ships — DNVGL-RU-SHIP-Pt3Ch2. Edition October 2015 Page 3 General arrangement design DNV GL AS s t CONTENTS n e t n Changes – current...................................................................................................... 3 o C Section 1 General....................................................................................................... 6 2 1 Application..............................................................................................6 r 1.1 ......................................................................................................... 6 e t p Section 2 Subdivision arrangement............................................................................ 7 a h 1 Watertight bulkhead arrangement..........................................................7 C 1.1 Number and disposition of watertight bulkheads...................................... 7 3 1.2 Openings in watertight bulkheads.......................................................... 8 t r 2 Watertight deck arrangement.................................................................8 a 3 Minimum bow height.............................................................................. 8 P 3.1 General...............................................................................................8 4 Collision bulkhead.................................................................................10 4.1 Extent and position of collision bulkhead............................................... 10 4.2 Arrangement of collision bulkhead........................................................ 12 5 Aft peak bulkhead................................................................................ 12 5.1 General............................................................................................. 12 Section 3 Compartment arrangement.......................................................................13 1 Cofferdams............................................................................................13 1.1 Definition...........................................................................................13 1.2 Arrangement of cofferdams................................................................. 13 2 Double bottom...................................................................................... 13 2.1 General............................................................................................. 13 2.2 Extent of double bottom..................................................................... 14 2.3 Height of double bottom..................................................................... 14 2.4 Small wells in double bottom tank........................................................14 3 Fore end compartments........................................................................14 3.1 General............................................................................................. 14 4 Aft end compartments.......................................................................... 14 4.1 Sterntube.......................................................................................... 14 4.2 Propulsion thruster compartment..........................................................14 5 Fuel oil tanks........................................................................................15 5.1 Arrangement of fuel oil tanks.............................................................. 15 6 Shaft tunnels........................................................................................ 16 Rules for classification: Ships — DNVGL-RU-SHIP-Pt3Ch2. Edition October 2015 Page 4 General arrangement design DNV GL AS 6.1 General............................................................................................. 16 s 7 Steering gear compartment.................................................................. 16 t n 7.1 General............................................................................................. 16 e t n Section 4 Access arrangement................................................................................. 17 o C 1 Access to tanks and compartments...................................................... 17 1.1 Access to tanks..................................................................................17 2 1.2 Access to double bottom compartments................................................ 17 r e 2 Closed spaces....................................................................................... 17 t p 2.1 General............................................................................................. 17 a h C 3 t r a P Rules for classification: Ships — DNVGL-RU-SHIP-Pt3Ch2. Edition October 2015 Page 5 General arrangement design DNV GL AS SECTION 1 GENERAL 1 n o 1 Application i t c 1.1 e S 1.1.1 Non-convention vessels shall be designed with consideration to risk and consequences of flooding due 2 to leakages or damage to side and bottom. The Society may require design damage cases to be defined and r described in the ship documentation. e t p 1.1.2 Requirements for the arrangement as given in Sec.2 [1] to Sec.2 [5] andSec.3 [2], assume damage a cases as defined by SOLAS. For vessels where other damage cases apply, the compartments shall be h arranged so that equivalent safety is provided with applicable damage cases. C 3 t r a P Rules for classification: Ships — DNVGL-RU-SHIP-Pt3Ch2. Edition October 2015 Page 6 General arrangement design DNV GL AS SECTION 2 SUBDIVISION ARRANGEMENT 2 Symbols n o For symbols not defined in this section, refer to Ch.1 Sec.4. i t c 1 Watertight bulkhead arrangement e S 2 1.1 Number and disposition of watertight bulkheads r e 1.1.1 All ships shall have at least the following transverse watertight bulkheads: t p a) one collision bulkhead a b) one aft peak bulkhead h C c) one bulkhead at each end of the engine room. 3 1.1.2 In the case of ships with an electrical propulsion plant, both the generator room and the engine room t shall be enclosed by watertight bulkheads. r a 1.1.3 In addition to the requirements of [1.1.1] and [1.1.2], the number and disposition of bulkheads shall P be arranged to suit the requirements for transverse strength, subdivision, floodability and damage stability, and shall be in accordance with the requirements of national regulations. 1.1.4 For vessels where no damage stability calculations have been carried out the total number of watertight transverse bulkheads shall not be less than given in Table 1. Table 1 Number of transverse bulkheads Engine room Ship length in m Aft Elsewhere L ≤ 65 3 4 65 < L ≤ 85 4 4 85 < L ≤ 105 4 5 105 < L ≤ 125 5 6 125 < L ≤ 145 6 7 145 < L ≤ 165 7 8 165 < L ≤ 190 8 9 190 < L ≤ 225 9 10 L > 225 specially considered 1.1.5 The watertight bulkheads shall extend to the bulkhead deck. 1.1.6 For ships with a continuous deck below the bulkhead deck and where the draught is less than the depth to this second deck, all bulkheads except the collision bulkhead may terminate at the second deck. In such cases the engine casing between second and bulkhead deck shall be arranged as a watertight structure, and the second deck shall be watertight outside the casing above the engine room. Rules for classification: Ships — DNVGL-RU-SHIP-Pt3Ch2. Edition October 2015 Page 7 General arrangement design DNV GL AS 1.1.7 In ships with a raised quarter deck, the watertight bulkheads within the quarter deck region shall 2 extend to this deck. n o i 1.2 Openings in watertight bulkheads t c 1.2.1 The number of openings in watertight bulkheads shall be kept at a minimum. Where penetrations e S of watertight bulkheads and internal