Page 222 - International safety guide for oil tankers and terminals

INTERNATIONAL SAFETY GUIDE FOR OIL TANKERS AND TERMINALS

Non-Inert Tanks
In ships that do not have access to inert gas, either through on board
Supervision and Preparation เท่านั้น---
facilities (e.g. IGS plant) or shore supply, it is only possible to address the
‘fuel’ and the ‘sources of ignition’ sides of the fire triangle. In a non-inert
condition, there are no physical barriers that will ensure elimination of
these two hazards individually. Therefore, the safety of tank washing in
the non-inert condition depends on the integrity of equipment, and
implementation of strict procedures to ensure these two hazards are
effectively controlled.
Non-inert cargo tank washing should only be undertaken when two sides
of the fire triangle are addressed by a combination of measures to control
both the flammability of the tank atmosphere AND sources of ignition.
It is recommended that all tankers that operate in the non-inert mode
incorporate within their design and equipment the ability to mechanically
ventilate cargo tanks concurrently with tank washing, in order to control
---ใช้เพื่อการศึกษา
tank atmosphere.

11.3.3 Preparationศูนย์ฝกพาณิชย์นาวี
11.3.3.1 Supervision

A Responsible Officer must supervise all tank washing operations.
ึ
All crew involved in the operation should be fully briefed by the
Responsible Officer on the tank washing plans, and their roles
and responsibilities prior to commencement.

All other personnel on board should also be notified that tank
washing is about to begin and this notification MUST in particular
be extended to those on board not involved directly in the tank
งานห้องสมุด
washing operation but who, by virtue of their own concurrent
tasks, may impact upon the safety of the tank washing operation.

11.3.3.2
Both before and during tank washing operations, the Responsible
Officer should be satisfied that all the appropriate precautions set
out in Chapter 4 are being observed. If craft are alongside the
tanker, their personnel should also be notified and their
compliance with all appropriate safety measures should be
confirmed.

Before starting to tank wash alongside a terminal, the following
additional measures should be taken:

Relevant precautions described in Chapter 24 should be
observed.
The appropriate personnel ashore should be consulted to
ascertain that conditions on the jetty do not present a hazard
and to obtain agreement that operations can start.

The method of tank washing utilised on board a tanker is
dependent on how the atmospheres in the cargo tanks are
managed and will be determined by the equipment fitted to the
vessel.

188 © ICS/OCIMF/IAPH 2006