Page 163 - International safety guide for oil tankers and terminals

MANAGEMENT OF SAFETY AND EMERGENCIES

the IG main and isolated from the piping system for the duration of the
Hot Work.
Completely filled with water.าเท่านั้น---

9.4.4.3 Hot Work Within the Cargo Tank Deck Area
งานห้องสมุด ศูนย์ฝกพาณิชย์นาวี
On the Tank Deck
If Hot Work is to be undertaken on the tank deck or at a height of less
than 500 mm above the tank deck, it should be classed as Hot Work
within that tank and the appropriate measures complied with
(see 9.4.4.2).

Above the Tank Deck
If Hot Work is to be undertaken above the tank deck (higher than
500 mm), cargo and slop tanks within a radius of at least 30 metres
around the working area should either be:
Cleaned and gas freed, with hydrocarbon vapour content reduced to
not more than 1% LFL and maintained at that level; or
---ใช้เพื่อการศึกษ
Emptied, purged and the hydrocarbon vapour content reduced to less
than 2% by volume and inerted; or

All other cargo tanks must be inerted with openings closed.
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All slops should be either removed from the ship or isolated in a tank as
far as practicable from the Hot Work location.

Additionally, on Non-Inerted Ships
All cargo tanks within 30 metres of the work location, including diagonally
positioned cargo tanks, should either have been cleaned and gas freed to
Hot Work standard, or completely filled with water.

All slops should be either removed from the ship or securely isolated in
the tank furthest (and at least 30 metres) from the Hot Work location.
Vapour or vent lines to the compartment should also be ventilated to not
more than 1% LFL and isolated.

The possibility of using an external source of inert gas should be
considered.

9.4.4.4 Hot Work in the Vicinity of Bunker Tanks

Hot Work in the vicinity of bunker fuel tanks should, in general, be treated
in the same manner as Hot Work over the tank deck. No Hot Work should
be carried out on the deck, or within 500 mm from such a deck, unless
the tank has been cleaned to Hot Work standard.

Bunker fuel tanks should be clearly identified to avoid any
misunderstanding as to their location and extent.

9.4.4.5 Hot Work on Pipelines

Wherever possible, sections of pipelines and related items, such as
strainers and valves, should be removed from the system and repaired in
the designated space. (See Section 9.4.2.)

Where Hot Work on pipelines and valves needs to be carried out with the
equipment in place, the item requiring Hot Work must be disconnected by
Cold Work, and the remaining pipework blanked off. The item to be

© ICS/OCIMF/IAPH 2006 129