RULES FOR CLASSIFICATION Yachts. Part 4 Systems and components Chapter 6 Piping systems. Edition December 2015 DNV GL AS

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1 RULES FOR CLASSIFICATION Yachts Edition December 2015 Part 4 Systems and components Chapter 6 The content of this service document is the subject of intellectual property rights reserved by ("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 is the officially binding version.

2 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. December 2015 Any comments may be sent by to rules@dnvgl.com 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, 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.

3 CURRENT CHANGES This is a new document. The rules enter into force 1 July Part 4 Chapter 6 Changes - current Rules for classification: Yachts DNVGL-RU-YACHT-Pt4Ch6. Edition December 2015 Page 3

4 CONTENTS Current changes...3 Section 1 Pipes, valves, fittings and pumps Testing of materials Oil fuel systems, filters Service tanks Lubricating oil system Lubricating oil pumps, main engines... 5 Section 2 Bilge systems Calculation of pipe diameters Bilge pumps Bilge pumping for various spaces Bilge testing Equipment for the treatment and storage of bilge water, fuel and oil residues...7 Part 4 Chapter 6 Contents Section 3 Cooling systems General Seawater cooling system, sea chest Clearing sea chest gratings Seawater cooling pumps, diesel engine plants Air, overflow and sounding pipes... 9 Rules for classification: Yachts DNVGL-RU-YACHT-Pt4Ch6. Edition December 2015 Page 4

5 SECTION 1 PIPES, VALVES, FITTINGS AND PUMPS 1 Testing of materials 1.1 For yachts under 500 GT, material certificates 3.1 according to DIN EN for fittings and valves in pipe classes I and II may be provided. 2 Oil fuel systems, filters 2.1 Any internal combustion engine, regardless of its intended use, shall be equipped with duplex type water separators incorporating pre-filter elements. 2.2 Changing of filter elements and draining of the separator shall be possible with the engine operating. Part 4 Chapter 6 Section 1 3 Service tanks 3.1 For motor yachts under 500 GT and all sailing yachts fuel oil service tanks need not be provided. 4 Lubricating oil system 4.1 For internal combustion engines single lubricating oil filters are acceptable for sailing yachts and motor yachts with more than one propulsion engine. 5 Lubricating oil pumps, main engines 5.1 Yachts for restricted service or with more than one main propulsion system need not have redundant lubricating pumps. 5.2 Yachts for unrestricted service and with a single propulsion plant shall have a redundant lubricating pump or carry on board a spare lubricating pump. Rules for classification: Yachts DNVGL-RU-YACHT-Pt4Ch6. Edition December 2015 Page 5

6 SECTION 2 BILGE SYSTEMS 1 Calculation of pipe diameters 1.1 Main bilge pipes The diameter d H of the bilge main shall be calculated according to the following formula. The actual inside diameter of the bilge main shall be rounded to the next higher nominal standard: d H L B H = the calculated inside diameter of the main bilge pipe [mm] = the length of the yacht [m] as defined in Pt.3 Ch.1 Sec.1 = for monohull yachts, the breadth of the yacht in [m] as defined in Pt.3 Ch.1 Sec.1 for multi-hull yachts the breadth of one hull at the design waterline [m] = the moulded depth of the yacht [m] as defined in Pt.3 Ch.1 Sec.1 The inside diameter is given by the formula: (1) Part 4 Chapter 6 Section 2 (2) d z l = calculated inside diameter [mm] of the branch pipes = length [m] of the watertight compartment 1.2 Branch bilge pipes The inside diameter is given by the formula: (3) d z l = calculated inside diameter [mm] of the branch pipes = length [m] of the watertight compartment 1.3 Minimum diameter The inside diameter of main and branch bilge pipes shall not to be less than 50 mm. For yachts under 500 GT, the inside diameter may be reduced to 40 mm. 2 Bilge pumps 2.1 The number of bilge pumps shall be evaluated as prescribed for cargo ships see SHIP Pt.4 Ch.6 Sec.4 [8]. Rules for classification: Yachts DNVGL-RU-YACHT-Pt4Ch6. Edition December 2015 Page 6

7 3 Bilge pumping for various spaces 3.1 Machinery Spaces On yachts of more than 100 gross tons, the bilges of every machinery space shall be capable of being drained as follows: through the bilge suctions connected to the main bilge system through one direct suction connected to the largest independent bilge pump through an emergency bilge suction connected to the independent cooling water pump of the main propulsion plant or through another suitable emergency bilge system For yachts under 500 GT, the emergency bilge suction need not be provided, if an independent power driven sea water cooling pump or any other suitable pump is not available. 3.2 Bilge suctions for other spaces Bilge suction shall be arranged for the shaft tunnel (if applicable), fore and after peaks, cofferdams, pipe tunnels and void spaces as well as chain lockers. Part 4 Chapter 6 Section 2 4 Bilge testing 4.1 For yachts of 500 GT and over all bilge arrangements shall be tested under the Society supervision. 5 Equipment for the treatment and storage of bilge water, fuel and oil residues 5.1 Oily water separating equipment Guidance note: For yachts of less than 400 gross tons it is not permitted to discharge oily bilge water as well as fuel and oil residues into the sea 1 It is therefore recommended to provide also for such yachts equipment for collecting these liquids and to discharge them to reception facilities. ---e-n-d---of---g-u-i-d-a-n-c-e---n-o-t-e--- 1 With regard to the installation on yachts of oily water separators, filter plants, oil collecting tanks, oil discharging lines and a 15 ppm alarm device in the water outlet of oily water separators, compliance is required with the provisions of the International Convention for the Prevention of Pollution from Ships, 1973 (MARPOL) and the Protocol 1978, as applicable. Rules for classification: Yachts DNVGL-RU-YACHT-Pt4Ch6. Edition December 2015 Page 7

8 SECTION 3 COOLING SYSTEMS 1 General 1.1 All internal and external cooling systems of any internal combustion engine shall be in compliance with the manufacturer's installation recommendation. 1.2 If the manufacturers recommend coolant treatment and checks, the design of the piping system shall be such, that applying of additives and taking of samples is easily possible. All coolant venting lines shall be arranged with upwards slope throughout. 2 Seawater cooling system, sea chest 2.1 For motor yachts under 500 GT and all sailing yachts a second sea chest need not be provided. Part 4 Chapter 6 Section 3 3 Clearing sea chest gratings 3.1 All sailing yachts need not be provided with a device for sea chest clearing. 3.2 Motor yachts with an auxiliary system producing compressed air shall be equipped with means for clearing sea chests 4 Seawater cooling pumps, diesel engine plants 4.1 Yachts for unrestricted service and a single propulsion plant shall have a stand-by seawater pump or carry a spare seawater pump on board. If feasible, the same applies to internal coolant circuit water pumps. At least one repair kit per each seawater pump type shall be carried on board. 4.2 Yachts for restricted service or with more than one main propulsion system need not have stand-by seawater cooling pumps. Rules for classification: Yachts DNVGL-RU-YACHT-Pt4Ch6. Edition December 2015 Page 8

9 5 Air, overflow and sounding pipes 5.1 Each tank shall be fitted with air pipes, overflow and sounding pipes. The air pipes are in general to be led to above the exposed deck. The height from the deck to the point where the water may have access is to be at least 760 mm on the freeboard deck and 450 mm on a superstructure deck. These heights may be reduced in agreement with the Society if the point of water access is suitably arranged. 5.2 Suitable closing appliances shall be provided for these pipes. For air pipes of 32 mm in diameter and above automatic closures shall be provided. In yachts for which flooding calculations are to be made, the ends of the air pipes shall be above the damage waterline in the flooded condition. Where they immerse at intermediate stages of flooding, these conditions are to be examined separately. 5.3 Sounding pipes shall be extended to directly above the tank bottom. Striking plates shall be provided under the sounding pipes. Part 4 Chapter 6 Section 3 Rules for classification: Yachts DNVGL-RU-YACHT-Pt4Ch6. Edition December 2015 Page 9

10 DNV GL Driven by our purpose of safeguarding life, property and the environment, DNV GL enables organizations to advance the safety and sustainability of their business. We provide classification and technical assurance along with software and independent expert advisory services to the maritime, oil and gas, and energy industries. We also provide certification services to customers across a wide range of industries. Operating in more than 100 countries, our professionals are dedicated to helping our customers make the world safer, smarter and greener. SAFER, SMARTER, GREENER