OSV chemical code : code for the transport and handling of hazardous and noxious liquid substances in bulk on offshore support vessels - 2018 Ed. - London International Maritime Organization 2018 - vii, 83p.


Resolution A.1122(30)
Chapter 1 – General
1.1 Application
1.2 Definitions
1.3 Equivalents
1.4 Surveys and certification
Chapter 2 – Vessel survival capability and location of cargo tanks
2.1 General
2.2 Freeboard and stability 2.3 N on-cargo discharges below the freeboard deck
2.4 Conditions of loading
2.5 Flooding assumptions
2.6 Damage assumptions
2.7 Standard of damage
2.8 Survival requirements
2.9 Location of cargo tanks
Chapter 3 – Vessel design
3.1 Cargo segregation
3.2 Accommodation, service and machinery spaces and control stations
3.3 Access to spaces in the cargo area
Chapter 4 – Special requirements for products with a flashpoint not exceeding 60°C, toxic products and acids
4.1 General requirements for products with a flashpoint not exceeding 60°C, toxic products and acids
4.2 Products with a flashpoint not exceeding 60°C
4.3 Toxic products
4.4 Acids
Chapter 5 – Cargo containment
5.1 Definitions
5.2 Tank type requirements for individual products
Chapter 6 – Cargo transfer
6.1 Piping scantlings
6.2 Piping fabrication and joining details
6.3 Flange connections
6.4 Test requirements for piping
6.5 Piping arrangements
6.6 Cargo-transfer control systems
Chapter 7 – Cargo tank venting
7.1 General
7.2 Types of tank venting systems
7.3 Venting requirements for individual products
7.4 Cargo tank gas freeing
Chapter 8 – Electrical installations
8.1 General requirements
8.2 Electrical requirements for individual products
Chapter 9 – Fire-fighting requirements
9.1 Application
9.2 Cargo pump-rooms
9.3 Protection of the cargo area
9.4 Special requirements
9.5 Inert gas production on board
Chapter 10 – Mechanical ventilation in the cargo area
10.1 Definitions
10.2 General requirements
10.3 Spaces not normally entered
Chapter 11 – Instrumentation and automation systems
11.1 General
11.2 Level indicators for cargo tanks
11.3 Overflow control
11.4 Vapour detection
Chapter 12 – Pollution prevention requirements
Chapter 13 – Life-saving appliances and arrangements
Chapter 14 – Personnel protection
14.1 Protective equipment
14.2 First-aid equipment
14.3 Safety equipment
14.4 Emergency equipment
Chapter 15 – Operational requirements
15.1 General.
15.2 Cargo information.
15.3 Personnel training.
15.4 Opening of and entry into cargo tanks.
15.5 Simultaneous carriage of deck cargo and products.
Chapter 16 – Backloading of contaminated bulk liquids
16.1 Preamble.
16.2 General.
16.3 Documentation.
16.4 Operation.
Chapter 17 – Discharging and loading of portable tanks on board
17.1 Preamble.
17.2 General.
17.3 Independent tanks.
17.4 Shipment of cargo in portable tanks used as deck tanks .
Chapter 18 – Carriage of liquefied gases
18.1 General requirements .
18.2 Accommodation, service and machinery spaces and control stations .
18.3 Cargo containment.
18.4 Materials of construction.
18.5 Vent system for cargo containment.
18.6 Cargo transfer.
18.7 Vapour detection.
18.8 Gauging and level detection.
18.9 Emergency shutdown system.
18.10 Personnel protection.
18.11 Carriage on open deck .
18.12 Carriage of other liquefied gases listed in chapter 19 of the IGC Code.
Appendix 1 Model form of Certificate of Fitness.
Appendix 2 Guidelines for testing prior to backloading.
Appendix 3 Model format for the procedure for discharging and loading portable tanks containing dangerous goods carried as deck tanks on offshore support vessels.

This present Code has been developed for the design, construction and operation of offshore support vessels (OSVs) which transport hazardous and noxious liquid substances in bulk for the servicing and resupplying of offshore platforms, mobile offshore drilling units and other offshore installations, including those employed in the search for and recovery of hydrocarbons from the seabed. The basic philosophy of the present Code is to apply standards contained in the Code and the International Code for the Construction and Equipment of Ships Carrying Dangerous Chemicals in Bulk (IBC Code) and in the International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk (IGC Code) to the extent that is practicable and reasonable taking into account the unique design features and service characteristics of OSVs.


Offshore support vessels
Ships - Cargo
Safety regulations

623.888 / IMO
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