IMO I788E-1996 Code for Existing Ships Carrying Liquefied Gases in Bulk (1976 Edition Includes Supplement IMO 791E 1980).pdf

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1、INTERNATIONAL MARITIME ORGANIZATION Supplement to the 1976 Edition of the CODE FOR EXISTING SHIPS CARRYING LIQUEFIED GASES IN BULK Amendments IMO SUPPLEMENT to the 1976 Edition of the CODE FOR EXISTING SHIPS CARRYING LIQUEFIED GASES IN BULK Guidelines for the Application of Amendments to the Code ad

2、opted by the Maritime Safety Committee at its thirty-ninth session (25-29 September 1978) Implementation Dates First set of Amendments adopted by the Maritime Safety Committee at its thirty-eighth session (1 9 April 1978) Second set of Amendments adopted by the Maritime Safety Committee at its forti

3、eth session (8 May 1979) Third set of Amendments adopted by the Maritime Safety Committee at its forty-second session (20 May 1980) IMO First published in 1980 by the INTERNATIONAL MARITIME ORGANIZATION 4 Albert Embankment, London SE1 7SR Printed by the International Maritime Organization, London 14

4、 16 18 20 19 17 15 ISBN 92-801-1 101-9 Sales number : IMO-791E NOTE: The name of the Organization as it appears in this publication was changed to “lnternational Maritime Organization” by virtue of amendments to the Organizations Convention which entered into force on 22 May 1982. Copyright O IMO 19

5、80 CONTENTS Page Guidelines for the application of amendments to the Code for Existing Ships Carrying Liquefied Gases in Bu1 k 5 Implementation dates . 5 First set of amendments . 7 Second set of amendments 9 Third set of amendments . 17 3 GUIDELINES FOR THE APPLICATION OF CARRYING LIQUEFIED GASES I

6、N BULK AMENDMENTS TO THE CODE FOR EXISTING SHIPS (adopted by the Martime Safety Committee at its thirty-ninth session) 1 An amendment to the Code, when adopted by the Maritime Safety Committee, should become applicable according to the following time scale after the date of its adoption, unless anot

7、her date is specified by the Maritime Safety Committee: .I relaxations - immediately; .2 all other amendments -a period as determined by the Maritime Safety Committee at the time of their adoption. Implementation Dates The implementation dates of the Code are indicated in the margin to the respectiv

8、e amendment, in accordance with the above Guidel ines. “IMM“ in the margin indicates that the amendments come into force immediately or “1“ one year (or any other period) after adoption of the amendments by the Maritime Safety Committee. 5 FIRST SET OF AMENDMENTS (adopted by the Maritime Safety Comm

9、ittee at its thirty-eighth session, 19 April, 1978) CHAPTER VI - MATERIALS OF CONSTRUCTION Table 6.5 - In column 1 amend entry: IMM “O and above“ to read “-5 and above“. CHAPTER XI - FIRE PROTECTION AND FIRE EXTINGUISHING Paragraph 11.6.1 - Amend to read: IMM “1 1.6.1 All ships should comply with th

10、e requirements of Regulation 52(j) of Chapter i 1-2 of the 1974 Safety Convention. In addition, in ships carrying flammable products of a cargo capacity of 2,000 m3 and over but ,less than 5,000 m3 two firemens outfits should be provided and on ships of a cargo capacity of 5,000 m3 and over three fi

11、remens outfits should be provided. Firemens outfits should comply with the requirements of Regula- tion 14 of Chapter 11-2 of the 1974 Safety Convention.“ CHAPTER XIV - PERSONNEL PROTECTION Section 14.3 -Amend to read: IMM “14.3 Sufficient, but not less than two complete sets of safety equipment in

12、addition to the firemens outfits required by 11.6.1, each permitting personnel to enter and work in a gas-filled space, should be provided.“ Section 14.5 - Amend to read: IMM “14.5 (a) An adequate supply of compressed air should be provided and should consist either of: (i) one set of fully charged

13、air-bottles for each breathing apparatus required by 14.3, a special air compressor suitable for the supply of high pressure air of the required purity, and a charging manifold capable of dealing with sufficient spare breathing apparatus cylinders for the breathing apparatus required by 14.3; or (i)

14、 fully charged spare air-bottles with a total free air capacity of at least 6,000 litres for each breathing apparatus required by 14.3. 7 (b) Alternatively, the Administration may accept a low pressure air line system with hose connexions suitable for use with the breathing appara- tus required by 1

15、4.3. This system should provide sufficient high pressure air capacity to supply, through pressure reduction devices, enough low pressure air to enable two men to work in a gas dangerous space for at least one hour without using the cylinders of the breathing apparatus. Means should be provided for r

16、echarging the fixed air-bottles and the breathing apparatus cylinders from a special air compressor suitable for the supply of high pressure air of the required purity.“ CHAPTER XVII - SPECIAL REQUIREMENTS Paragraph 17.2.3 - Amend to read: IMM “1 7.2.3 In ships of a cargo capacity of 2,000 m3 and ov

17、er, two complete sets of safety equipment should be provided in addition to the equipment required by 11.6.1 and 14.3. At least three spare charged air-bottles should be provided for each self-contained air-breathing apparatus required in this paragraph.“ 8 SECOND SET OF AMENDMENTS (adopted by the M

18、aritime Safety Committee at its fortieth session, 8 May 1979) CONTENTS Chapter XV I I - Special Requirements - add six new headings: “Section 10 - Vapour return connexions Section 11 - Toxic products Section 12 - High level alarm Section 13 - Flame screens on vent outlets Section 14 - Maximum allowa

19、ble quantity of cargo per tank Section 15 - Tanks used for carriage of products“ CHAPTER I - GENERAL Paragraph 1.2.4 - Replace by: IMM “1.2.4 Except as provided in 1.2.5(a), when it is intended to carry products covered by this Code and products covered by the Code for the Construction and Equipment

20、 of Ships Carrying Dangerous Chemicals in Bu1 k, Resolution A.212(VI I) (referred to hereunder as the Bu1 k Chemical Code) as amended, the ship should comply with the requirements of both Codes appropriate to the products carried.“ Paragraph 1.2.5 - Replace by: IMM “1.2.5 (a) The-rquiremeiits of thi

21、s Code should take precedence when a ship is designed and constructed for the carriage of the following products: (i) those listed exclusively in Chapter XIX of this Code; and (i) one or more of the products which are listed both in this Code and the Bu1 k Chemical Code as amended. These productsare

22、marked with an asterisk (“1 in table column (al of Chapter XIX. (b) When a ship is intended exclusively to carry one or more of the products noted in 125(a)(ii), the requirenients of the Bulk Chemical Code as amended should apply.“ IMM Paragraph ?.2.G - Rencrnber 1.2.4 as 7.2.6. Paragraph 1.2.7 - Re

23、number 1.2.5 as 1.2.7. Paragraph 1.2.8 - Renumber 1.2.6 as 1.2.8. Paragraph 1.2.9 - Renumber 1.2.7 as 1.2.9. 9 Paragraph 1.6.10 - Replace by: IMM “1.6.10 When a ship is designed and constructed under the provisions of 1.2.6, Certificates of Fitness should be issued in accordance with the requirement

24、s of this section and the requirements of section 1.6 of the Bu1 k Chemical Code.“ Paragraph 1.6.1 1 - Renumber 1.6.10 as 1.6.1 1. CHAPTER XVII - SPECIAL REQUIREMENTS Paragraph 17.2.1 - Replace by: 1 “1 7.2.1 purposes should be provided for every person on board subject to the fol lowing: Respirator

25、y and eye protection suitable for emergency escape (a) (i) filter type respiratory protection should be accepted, only when one filter is suitable for all designated cargoes that the ship IS certified to carry; or (i) self-contained breathing apparatus normally having a dura- tion of service of at l

26、east 15 minutes; (b) emergency escape respiratory protection should not be used for fire-fighting or cargo handling purposes and should be marked to that effect; (c) two additional sets of the above respiratory and eye protec- tion should be permanently located in the wheelhouse.“ Section 17.3 - Add

27、 the following three paragraphs to read: IMM “1 7.3.4 Copper, copper alloys, zinc or galvanized steel IMM 17.3.5 Aluminium or copper or alloys of either IMM 17.3.6 Copper and copper bearing alloys with greater than one per cent copper.“ Paragraph 17.9.5 - Add the following new paragraphs to read: IM

28、M “1 7.9.5 Diethyl ether/vinyl ethyl ether The cargo should be discharged only by deepwell pumps or by hydraulically operated submerged pumps. These pumps should be of a type designed to avoid liquid pressure against the shaft gland. Inert gas displace- ment may be used for discharging cargo from in

29、dependent tanks type C provided the cargo system is designed for the expected pressure.“ 10 IMM “1 7.9.6 Propylene oxide (a) (b) Propylene oxide transported under the provisions of this section should be acetylene free. For the purpose of this section, the term “independent“ means that a piping syst

30、em or venting system, for example, is in no way connected to another system and that there are no means available for the potential connexion to other systems. Unless cargo tan ks are properly cleaned, propylene oxide should not be carried in tanks which have contained as one of the three previous c

31、argoes any product known to catalyse polymerization, such as: (1) (2) amines and amine solutions; (3) oxidizing substances, (e.g. chlorine) Before carrying propylene oxide, tanks should be thoroughly cleaned effectively to remove all traces of previous cargoes from tanks and associated pipework, exc

32、ept where the immediate prior cargo has been propylene oxide. Particular care should be taken in the case of ammonia in mild steel tanks. In all cases, the effectiveness of cleaning procedures for tanks and associated pipework should be checked by suitable testing or inspection to ascertain that no

33、traces of acidic or alkaline materials remain that might create a hazardous situation in the presence of propylene oxide. Tanks should be entered and inspected prior to each initial loading of propylene oxide to ensure freedom from contamina- tion, including heavy rust deposits. When cargo tanks are

34、 in continuous propylene oxide service, such inspections should be performed at intervals of not more than two years. Tanks for the carriage of propylene oxide should be of steel or stainless steel construction. Tanks which have contained propylene oxide may be used for other cargoes after thorough

35、cleaning of tanks and associated pipework systems by washing or purging. All valves, flanges, fittings and accessory equipment should be of a type suitable for use with propylene oxide and should be con- structed of steel or stainless steel or other material acceptable to the Administration. The che

36、mical composition of all material used should be submitted to the Administration for approval prior to fabrication. Discs or disc faces, seats and other wearing parts of valves should be made of stainless steel containing not less than 11 per cent chromium. Gaskets should be constructed of materials

37、 which do not react with, dissolve in or lower the auto-ignition temperature of propylene oxide and which are fire resistant and possess adequate mechanical behaviour. The surface presented to the cargo should ammonia anhydrous and ammonia solutions; 11 (iii) (iv) be polytetrafluoroethylene (PTFE) o

38、r materials giving a similar degree of safety by their inertness. Spirally-wound stainless steel with a filler of PTFE or similar fluorinated polymer may be accepted by the Administration. Insulation and packing if used, should be of a material which does not react with, dissolve in, or lower the au

39、to-ignition temperature of propylene oxide. The following materials are generally found unsatisfactory for gaskets, packing and similar uses in propylene oxide containment systems and would require testing before being approved by the Ad m i n ist rat ion : (1) Neoprene or natural rubber if it conta

40、cts propylene oxide. (2) Asbestos or binders used with asbestos. (3) Materials containing oxides of magnesium, such as mineral wools. Filling and discharge piping should extend to within 100 mm of the bottom of the tank or any sump pit. (i) Propylene oxide should be loaded and discharged in such a m

41、anner that venting of the tanks to atmosphere does not occur. If vapour return to shore is used during tank loading, the vapour return system connected to a propylene oxide containment system should be independent from all other containment systems. (i) During discharging operations, the pressure in

42、 the cargo tank must be maintained above 0.035 kp/cm2 gauge. (iii) The cargo may be discharged only by deepwell pumps, hydrauli- cally operated submerged pumps, or inert gas displacement. Each cargo pump should be arranged to ensure that the propylene oxide does not heat significantly if the dischar

43、ge line from the pump is shut off or otherwise blocked. Tan ks carrying propylene oxide should be vented independently of tanks carrying other products. Facilities should be provided for sampling the tank contents without opening the tank to atmosphere Cargo hoses used for transfer of propylene oxid

44、e should be marked “FOR PROPYLENE OXIDE TRANSFER ONLY“. Hold spaces should be inerted and should be moriitored for propylene oxide and oxygen. The oxygen content of these spaces should be main- tained below 2 per cent. Prior io disconnecting shore-lines, the pressure in liquid and vapour lines shoul

45、d be relieved through suitable valves installed at the loading header. Liquid and vapour from these lines should not be discharged to atmosphere. Tanks should be designed for the maximum pressure expected to be encountered during loading, conveying and discharging cargo. 12 (1) Cargo tanks with a de

46、sign vapour pressure less than 0.6 kp/cm2 gauge should have a cooling system to maintain the propylene oxide below the reference temperatu re. (m) Pressure relief valve settings should not be less than 0.21 kp/cm2 gauge, nor greater than 7.0 kp/cmZ gauge for independent tanks type C. The piping syst

47、em for tanks to be loaded with propylene oxide should be completely separate from piping systems for all other tanks, including empty tanks, and from all cargo compressors. If the piping system for the tanks to be loaded with propylene oxide is not independent as defined in 17.9.6(b), the required p

48、iping separation must be accomplished by the removal of spool pieces, valves, or other pipe sections, and the installation of blank flanges at these locations. The required separation applies to all liquid and vapour piping, liquid and vapour vent lines and any other possible connexions such as comm

49、on inert gas supply lines. Propylene oxide may be transported only in accordance with cargo handling plans that have been approved by the Administra- tion. Each intended loading arrangement should be shown on a separate cargo handling plan. Cargo handling plans should show the entire cargo piping system and the locations for installation of blank flanges needed to meet the above piping separation requirements. A copy of each approved cargo handling plan should be kept on board the ship. The Certificate of Fitness should be endorsed to include reference to the approved cargo handl