Some standard content:
GB18180—2000
The requirements specified in this standard involve the safe operation management, loading and unloading, lightering and other related operation requirements of liquefied gas tankers. These regulations are used to ensure the uniformity of safety technical requirements for liquefied gas tankers. This standard is proposed and managed by the Ministry of Transport of the People's Republic of China. The drafting units of this standard are: the Institute of Standards and Metrology of the Ministry of Transport, the Maritime Safety Administration of the People's Republic of China, the Zhuhai Maritime Safety Supervision Bureau, Shekou South China Liquefied Gas Shipping Company, Dalian Ocean Shipping Company, Shenzhen Water Safety Supervision Bureau. The main drafters of this standard are: Bai Zongcheng, Hao Xilan, Yang Xinzhai, Yang Wen, Lian Junhong, Zhang Xuewen, Wang Shengming. 68
1 Scope
National Standard of the People's Republic of China
Requirements for the safe operation of liquefied gas tankers
The requirements for the safe operation of liquefied gas tankers
This standard specifies the technical and management requirements for the safe operation of liquefied gas tankers. This standard applies to liquefied gas tankers.
2 Referenced standards
GB18180—2000
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. All versions are valid when this standard is published. All standards will be revised, and parties using this standard should explore the possibility of using the latest version of the following standards. GB17422—1998 Safety Code for Water Transfer Operations of Liquefied Gas Tankers IMOIGC-1983 International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk 3 Definitions
This standard adopts the following definitions.
3.1 Liquefied gas
Liquids with an absolute vapor pressure exceeding 0.28MPa at a temperature of 37.8C and other bulk cargoes listed in Chapter 19 of IMOIGC.
3.2 Liquefied gas tanker Liquefied gas tanker is a ship used to transport liquefied gas in bulk. 3.3 Cargo operations cargo operations
Any operation on board a liquefied gas ship involving liquid cargo or vapor, including loading and unloading, reliquefaction, vapor discharge, etc. 3.4 Hazardous area hazardous area
A place for loading and unloading flammable cargoes and where flammable gases may be generated and easily accumulated. 3.5 Insulating flange insulating flange refers to a special flange for joints equipped with insulating linings, bushings and gaskets to prevent current paths between pipes, hoses or loading and unloading arms. 3.6 Gas freeing
It means to introduce sufficient fresh air to reduce the content of any flammable, toxic or inert gas to the required standard for a specific purpose (such as hot work, personnel entry, etc.).
3.7 Interbarrier space The space between the primary and secondary barriers of the cargo containment system, whether filled with insulating materials or other materials in whole or in part. 3.8 Hot workwwW.bzxz.Net
Work that produces a source of ignition or a temperature high enough to cause a flammable mixture to ignite. This includes work that requires the use of any of the following equipment: electric welding, gas welding, burning and cutting equipment, blowtorches, certain power tools, portable electrical equipment that is not intrinsically safe or does not have an approved explosion-proof enclosure, and internal combustion engines.
Approved by the State Administration of Quality and Technical Supervision on August 28, 2000 and implemented on July 1, 2001
3.9 Inerting
GB 18180--2000
The process of introducing inert gas into a cargo tank to prevent the formation of a flammable mixture in the tank. 3.10 Aerating
The process of replacing the unacceptable gas environment in the tank by introducing nitrogen or other suitable inert gas or suitable cargo vapor. 4 Vessel suitability requirements
4.1 All vessels transporting bulk liquefied gases shall comply with the relevant regulations established by IMO or the relevant specifications established by the national ship inspection department and obtain the corresponding recognized certificates.
4.2 Vessels must be equipped with a cargo operation safety manual, the contents of which shall include all items in Section 18.1.1 of IMO IGC (1983). 5 Information exchange between the ship and the loading and unloading parties
5.1 Before the ship berths, the two parties shall exchange the following information a) berth water depth and water density;
b) the draft of the ship when it arrives at the port;
c) the maximum draft expected during and at the end of loading and unloading d) the captain's notice requesting the assistance of the terminal tugboat; e) providing detailed information on mooring facilities;
f) whether there is any repair work that affects the start of loading and unloading on time; g) whether there is any leakage in the hull, cabins, valves or pipelines that affects loading and unloading or causes pollution; h) cathodic protection measures taken by the ship.
5.2 Before loading, the two parties shall exchange the following information: a) the physical and chemical characteristics of the cargo that should be noted; b) the special requirements of the cargo for the cargo hold environment (inerting, purification, inhibition, drying); c) the expected loading temperature, pressure and loading order of the cargo; d) the maximum loading rate and the maximum pressure that the ship-shore connection can withstand; e) the arrangement of the ballast, the composition and quantity contained, the time required for ballast discharge and the maximum empty load. 5.3 Before unloading, the two parties shall exchange the following information:
a) the name of the cargo that the consignee intends to accept, the designated quantity and the unloading order that can be accepted; b) the vapor pressure and liquid cargo temperature of the cargo when it arrives at the port; c) the name, quantity and loading diagram of the cargo loaded into the liquid cargo tank; d) the achievable unloading rate and unloading pressure; e) the estimated start time and required continuation time of ballasting the dedicated ballast tank. 5.4 Other information that the ship and the loading and unloading parties need to exchange a) The number, size and number of pipe joints of hoses and loading and unloading arms; b) The quantity and characteristics of sewage, dirty ballast water and chemical additives pollution; c) The name, composition and composition of the cargo, molecular weight, density or specific gravity and other physical and chemical characteristics that should be paid attention to; d) The communication system for controlling loading and unloading operations, including emergency stop operation signals; e) Loading and unloading operation mode, loading and unloading plan, quantity and cargo stowage diagram; f) Whether cargo vapor is refluxed, cargo vapor treatment methods or requirements; g) Before cargo loading and unloading operations, both the ship and the shore are familiar with the performance of the ship and shore cargo loading and unloading equipment, the predetermined operating procedures, safety measures, safety requirements and other safety operation regulations.
6 General safety requirements
GB18180-2000
6.1 During loading and unloading, fire-fighting equipment should be in a ready-to-use state. 6.2 Permanent warning signs or general signs on board should be placed in conspicuous places. 6.3 Electrical insulation between the ship and the shore should be carried out with insulating flanges or a section of non-conductive hose. 6.3.1 All metal components on the shore side of the insulating flange or non-conductive hose are to be reliably grounded to the dock, while all metal components on the seaward side are to be reliably connected to the hull.
6.3.2 The insulating flange is to be inspected regularly to ensure that the surface of the insulating flange is clean and in good insulation condition. 6.3.3 The internal electrical connection continuity between the flanges at both ends of the non-conductive hose is to be checked before it is put into use, and is to be checked regularly thereafter.
6.4 Ventilation
6.4.1 Ventilate spaces where gas often accumulates at least 10 minutes in advance and throughout the process. 6.4.2 Ventilate if there is a suspected leakage of liquid or cargo vapor. 6.4.3 During cargo operations, in order to prevent cargo vapor from being sucked into the living area, the mechanical ventilation of the living area is to be stopped, the air conditioning system is to be stopped or converted to internal circulation, and the window air conditioner is to be stopped and its opening is to be closed. 6.4.4 During cargo operations, in order to prevent cargo vapor from entering the deckhouse or superstructure, all doors, windows and other openings in these spaces are to be kept closed.
6.5 Weather
6.5.1 When weather conditions may affect the safety of operations, operations should be stopped in time. 6.5.2 In cold weather, equipment should be prevented from freezing. 6.6 Lighting
6.6.1 There should be good lighting for night operations. 6.6.2 All lighting equipment used in hazardous areas must be of approved safety type. 6.7 When ballasting or deballasting, full attention should be paid to the stability of the ship. 6.8 The liquid in the cargo pipeline on board should be blown clean. 6.9 Strictly abide by the regulations on smoking and using open flames. 6.10 When carrying out open flame or non-open flame repair work on board, relevant regulations should be strictly observed. 6.11 During loading and unloading, the ship should be equipped with emergency towing cables. 6.12 Establish a safety patrol inspection system for liquefied gas ships. 6.13 Formulate safety codes for liquefied gas ships. 6.14 Monitor the pressure changes in the cargo hold space or the space between the barriers, and take some necessary measures. 6.15 Personnel protection
The ship should prepare firefighter equipment, safety protection clothing, first aid kit, air breathing apparatus, gas mask and oxygen resuscitator so that they can be used at any time.
7 Loading and unloading operations
7.1 Carry out inspections according to the ship-shore safety inspection list. Loading and unloading operations can only be carried out after the ship and the loading and unloading parties are satisfied. 7.2 According to the special requirements of the cargo for the cargo tank environment, the liquid cargo tank and cargo pipelines shall be dried, inerted or cooled. 7.3 During loading and unloading, the pressure of the liquid cargo tank should be observed regularly and the changes in the liquid level should be monitored. 7.4 If an electric submersible pump is installed, its insulation value should be checked before starting. 7.5 Start the cargo pump with the discharge valve closed or partially opened to reduce the starting load and reduce pressure shock. 7.6 Check the sealing condition of the pipeline joints frequently. 7.7 Strictly comply with the filling limit requirements.
8 Cargo status control
GB18180-2000
8.1 Cargo status control using reliquefaction equipment. 8.1.1 Prevent the formation of ice and hydrates, and give full consideration to the compatibility of various cargoes and the possibility of mutual contamination. 8.1.2 Before starting the reliquefaction equipment, all pipelines and valves should be rechecked. 8.1.3 Flammable cargo vapor/air mixture should not enter the cargo compressor. 8.1.4 Regularly check the discharge of non-condensable gases. 8.1.5 After the condensate is recovered, the liquid level of the condensate container should be checked regularly. 8.2 Cargo status control using cargo vapor as fuel (only applicable to liquefied natural gas transport ships). 8.2.1 Before and after the combustion operation, the fuel supply pipeline should be flushed with inert gas in time. 8.2.2 During the combustion operation, ensure that the pressure of the liquid cargo tank is higher than the atmospheric pressure. 8.2.3 Avoid rapid changes in the gas supply pressure to ensure the stability of the combustion flame. 8.2.4 Check the gas supply pipeline for leakage regularly. 8.2.5 All joints of the gas supply pipeline should be pressure tested after repair and before being put into operation. 8.2.6 Drain the accumulated water in the fuel pipeline regularly. 8.2.7 Clean the fireproof net inside the fuel supply pipeline or burner regularly. 9 Other related operation requirements
9.1 Water transfer operation
Water transfer operation should comply with the requirements of GB17422. 9.2 Repair work (including open flame operation and use of power tools) 9.2.1 Ensure that there is no flammable gas in the construction area during the entire process. 9.2.2 There is no flammable gas in the adjacent space that can be ignited by heat transmitted through bulkheads or decks. 9.2.3 All flammable materials (such as insulating materials) have been completely removed or protected from heat. 9.2.4 Written permission from the competent authority should be obtained for hot work in the port. 9.2.5 Repairs and other works which may render the vessel incapable of manoeuvring shall not be carried out at the dock without the consent of the Administration. 5 Sufficient fire-fighting equipment shall be available and in a state of ready use. 9.2.6
9.2.7 Safety measures and construction procedures shall be established and strictly followed. 9.3 Inerting operations
9.3.1 Inerting cargo holds containing air
The oxygen content in the tanks shall be checked regularly and the oxygen content after inerting shall meet the requirements of the intended cargo. 9.3.2 Inerting cargo holds containing cargo vapour
9.3.2.1 Before connecting the inerting gas system, the cargo pipeline shall be connected to the ventilation system to prevent the backflow of cargo vapour. 9.3.2.2 The inerting process shall continue until the concentration of cargo vapour is low enough to prevent the formation of a flammable mixture when subsequently ventilated with air. 9.4 Purification Operation
9.4.1 When the original inert gas in the cargo hold cannot meet the requirements of the cargo, it shall be replaced with pure nitrogen. 9.4.2 Replace the cargo vapor loaded last time with the cargo vapor planned to be loaded. 9.4.2.1 If the two cargoes are compatible, the cargo vapor stored on board or supplied on board can be directly used for purification. 9.4.2.2 If the two cargoes are incompatible, the inert gas shall be used for purification. 9.5 Steam Emission
9.5.1 When purging in port, the discharged steam shall be passed to appropriate facilities on shore for combustion or treatment and recovery. 9.5.2 If it is directly discharged into the atmosphere in port, the relevant regulations shall be strictly observed. 9.5.3 If the concentration of cargo vapor is detected to reach 30% of the lower explosion limit or the toxicity reaches above the critical limit in the vicinity of the ship during the discharge, the discharge shall be stopped immediately.
10 Emergency Measures
10.1 Establish an emergency organization.
10.2 Prepare an emergency plan.
GB 18180—2000
10.3 When formulating emergency measures, at least the following situations should be considered: a) ship fire;
b) liquefied gas leakage;
c) collision;
d) grounding;
e) mooring failure;
f) communication failure;
g) personal injury (frostbite, scald, poisoning and suffocation, etc.); h) emergency departure;
i) hydrological and meteorological conditions exceed the safe operation limit. 10.4 The ship should organize personnel to conduct drills according to emergency procedures regularly. 733 If the concentration of cargo vapor detected near the ship reaches 30% of the lower explosion limit or the toxicity reaches above the critical limit during discharge, the discharge should be stopped immediately.
10 Emergency measures
10.1 Establish an emergency organization.
10.2 Prepare an emergency plan.
GB 18180—2000
10.3 When formulating emergency measures, at least the following situations should be considered: a) ship fire;
b) liquefied gas leakage;
c) collision;
d) grounding;
e) mooring failure;
f) communication failure;
g) personal injury (frostbite, scald, poisoning and suffocation, etc.); h) emergency unberthing;
i) hydrological and meteorological conditions exceed the safe operation limit. 10.4 Vessels should regularly organize personnel to conduct drills according to emergency procedures.3 If the concentration of cargo vapor detected near the ship reaches 30% of the lower explosion limit or the toxicity reaches above the critical limit during discharge, the discharge should be stopped immediately.
10 Emergency measures
10.1 Establish an emergency organization.
10.2 Prepare an emergency plan.
GB 18180—2000
10.3 When formulating emergency measures, at least the following situations should be considered: a) ship fire;
b) liquefied gas leakage;
c) collision;
d) grounding;
e) mooring failure;
f) communication failure;
g) personal injury (frostbite, scald, poisoning and suffocation, etc.); h) emergency unberthing;
i) hydrological and meteorological conditions exceed the safe operation limit. 10.4 Vessels should regularly organize personnel to conduct drills according to emergency procedures.
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