Page 162 - International safety guide for oil tankers and terminals

INTERNATIONAL SAFETY GUIDE FOR OIL TANKERS AND TERMINALS

Heating coils should be flushed or blown through with steam and proved
clear of hydrocarbons.
---ใช้เพื่อการศึกษาเท่านั้น---
An adjacent fuel oil bunker tank may be considered safe if tests give a
reading of less than 1% LFL in the vapour space of the bunker tank, and
All slops should be either removed from the ship or securely isolated in aย์นาวี
no heat transfer through the bulkhead of the bunker tank will be caused
by the Hot Work.

Non-inerted Ships
The compartment in which the Hot Work is to be carried out should be
cleaned, gas freed to Hot Work standard and be continuously ventilated.

Adjacent cargo tanks, including diagonally positioned cargo tanks, should
งานห้องสมุด ศูนย์ฝกพาณิช
either have been cleaned and gas freed to Hot Work standard or
completely filled with water.

closed and non-adjacent tank at least 30 metres from the Hot Work
location. For this purpose, tanks located diagonally should be regarded as
adjacent tanks. A non-adjacent slop tank should be kept closed, securely
isolated from the IG main and isolated from the piping system for the
duration of the Hot Work.

Vapour or vent lines to the compartment should also be ventilated to not
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more than 1% LFL and isolated.
The possibility of using an external source of inert gas should be
considered.

Inerted Ships
The compartment in which the Hot Work is to be carried out should be
cleaned, gas freed to Hot Work standard and be continuously ventilated.

Adjacent cargo tanks, including diagonally positioned cargo tanks, should
either be:
Cleaned and gas freed, with hydrocarbon vapour content reduced to
not more than 1% LFL and maintained at that level; or
Emptied, purged and the hydrocarbon vapour content reduced to less
than 2% by volume and inerted; or

Completely filled with water.

All other cargo tanks should be inerted and their deck openings closed.

When Hot Work is to be carried out on a cargo tank bulkhead, or within
500 mm of such a bulkhead, then the space on the other side should also
be cleaned to Hot Work standard.

Consideration should be given to reducing the inert gas pressure for the
duration of the Hot Work to prevent uncontrolled venting.

Inert gas lines to the compartment should be purged with inert gas to not
more than 2% hydrocarbon by volume and isolated.

All slops should be either removed from the ship or securely isolated in a
non-adjacent tank at least 30 metres from the Hot Work location. For this
purpose, tanks located diagonally should be regarded as adjacent tanks.
A non-adjacent slop tank should be kept closed, securely isolated from

128 © ICS/OCIMF/IAPH 2006