Section 1 General

101. Application

1. The requirements in this chapter apply to Offshore supply vessels(hereinafter referred to as "ships") which are primarily engaged in the transport of stores, materials, equipment and/or personnel (excluding crew boats) to, from and between offshore installations.

2. The ships should comply with the requirements of this chapter in addition to Ch 1 to Ch 3.

102. Scope

This chapter addresses the safety aspects related to offshore supply vessels for carrying deck car- goes, dry and liquid cargoes including flammable cargoes having a flashpoint (closed cup test) above 60°C (140°F), such as fuel oil, base oil and oil-based liquid mud.

103.

1.

2.

Submission of Data

In general, in addition to the plans listed in Ch 2, Sec 2, the following plans and particulars are to be submitted.

(A) Information regarding loading arrangement of deck cargoes, weights and their centers of gravity

(B) Structural details and arrangements of structures in way of cargo deck

(C) Lashing arrangement of deck cargoes

(D) Details of integral liquid cargo tanks including vents and/or overflows height and location

(E) Details of independent liquid and/or dry cargo tanks

(F) Details of independent tank supports and fastening arrangements

(G) Piping diagrams of liquid cargo transfer systems

(H) Piping diagrams of dry bulk cargo transfer systems

(I) Ventilation diagrams of liquid cargoes

(J) Arrangement in dry cargo compartment

Where the ships are intended to carry limited amounts of hazardous and noxious liquid substances in bulk, the following materials are to be submitted in addition to the above 1.

(A) General arrangements showing the locations of the following:

(a) Hazardous areas

(b) Cargo tanks with adjacent cofferdams

(c) Full particulars of the intended cargo or cargoes and its properties

(d) Cargo hatches and other openings to cargo tanks

(e) Doors, hatches and other openings to pump rooms and other hazardous spaces

(f) Ventilation ducts and openings to pump rooms and other hazardous spaces

(g) Doors, air locks, hatches hinged scuttles which can be opened, and other openings to non-hazardous spaces adjacent to cargo area

(h) Cargo pipes above the deck with loading and discharging connections

(i) Vent pipes for cargo tanks

(B) Plans for the following pumps and piping system arrangements:

(a) Cargo piping system including drawings showing details such as expansion elements and flange connections (pipe joints)

(b) Bilge piping systems in pump room, cofferdams, and pipe tunnels within the cargo area

(c) Cargo heating systems

(d) Procedures and calculations of cooling down, loading and unloading operations

(C) Plans for the following equipment and systems as applicable

(a) Pressure vacuum valves or high velocity vent valves, details and installation of safety valves and relevant calculations of their relieving capacity

(b) Arrangement and capacity of ventilation system in the cargo area

(c) Fan rotating parts and casing

(d) Portable ventilators

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Ch 4 Offshore Supply Vessels Ch 4

(e) Arrangement of inert gas supply if applicable.

(D) Plans of electrical installations, listing the following particulars

(a) Drawings showing location of all electrical equipment in hazardous areas

(b) List of certified safe equipment

(c) One-line diagram for intrinsically safe circuits and data

(E) Documents for fire protection

(a) Arrangement and specifications of fixed fire extinguishing systems

(b) Diagrams of fire and gas detection and alarm systems

(F) Documents for the control and monitoring system

(a) Cargo tank level measurement system

(b) Cargo tank overflow protection system

(c) Cargo valves and pump control and monitoring system

(d) Inert gas control and monitoring system if applicable