Page 265 - International safety guide for oil tankers and terminals

Chapter 14
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SPECIAL SHIP

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TYPES

This Chapter sets out safety measures to be taken on combination carriers in
addition to those necessary for conventional tankers. For the purpose of this Guide,
a combination carrier is a tanker designed to carry oil or solid cargoes in bulk,
and is one of two main types, an Oil/Bulk/Ore ship or an Oil/Ore ship.

Other specialised types of combination carriers, which may for example carry
oil in bulk as well as containers or general cargo, are not covered.

Some LPG carriers are certified to carry other petroleum products, such as light
naphtha, jet fuel and motor gasolines (mogas). Section 14.2 provides guidance
relating to LPG carriers when engaged in petroleum trades.

ึ
14.1 Combination Carriers

14.1.1 General Guidance
Petroleum and dry bulk cargoes should not be carried simultaneously.

Attention should be paid to the gas contents of wing tanks when the
vessel is discharging bulk ore. Similarly, it should be realised that
damaged bulkheads may lead to flammable gas mixtures in ore holds.

Between cargo holds, there may be a void space through which various
piping systems can pass and which provide access to tank valves and
double bottom tanks.

A single duct keel may be fitted along the centre line. On some ships, two
duct keels are fitted, one on either side of the centre line. Some duct
keels and pipe tunnels may be fitted with wheeled trolleys on rails to
permit easier access for personnel and equipment. These spaces may be
fitted with fixed lighting, fixed washing systems and a fixed gas monitoring
system.

Because of their restricted natural ventilation, these spaces may be
oxygen deficient. Furthermore, they are adjacent to cargo holds and
ballast tanks, so both hydrocarbon vapour and inert gas may leak into
them. The spaces should be regularly monitored for gas concentrations.
Enclosed space entry requirements given in Chapter 10 should be strictly
applied. The rescue of an unconscious or injured person from these
confined spaces may be extremely difficult.

© ICS/OCIMF/IAPH 2006 231