Page 382 - International safety guide for oil tankers and terminals

INTERNATIONAL SAFETY GUIDE FOR OIL TANKERS AND TERMINALS

Before entering a tank that has been inerted, it must be gas freed for entry and,
unless all tanks are gas freed and the inert gas system is completely isolated, each
---ใช้เพื่อการศึกษาเท่านั้น---
individual tank to be entered for inspection must be isolated from the inert gas
system (see Sections 7.1.6.12).

งานห้องสมุด ศูนย์ฝกพาณิชย์นาวี
If, because the cargo to be loaded has a critical specification, it is necessary for the
inspector to enter a tank, all the precautions contained in Section 10.5 must be
followed.

24.5 Segregated Ballast Tank Lids

Segregated ballast tank lids may be opened before discharge of ballast is
commenced, to allow the surface of the ballast to be inspected for contamination.
Segregated ballast tank lids should, however, normally be kept closed when cargo or
ballast is being handled because petroleum gas could be drawn into them.

Segregated ballast tank lids must be clearly marked to indicate the tank they serve.

24.6 Ship and Shore Cargo Connections

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24.6.1 Flange Connections
Flanges for ship-to-shore cargo connections at the end of the terminal
pipelines and on the ship’s manifold should be in accordance with the
OCIMF publication ‘Recommendations for Oil Tanker Manifolds and
Associated Equipment’.

Flange faces, gaskets and seals should be clean and in good condition.
When in their storage location, flange faces should be suitably protected
from corrosion/pitting.

Where bolted connections are made, all bolt holes should be used. Care
should be taken when tightening bolts as uneven or over tightened bolts
could result in leakage or fracture. Improvised arrangements using
‘G’ clamps or similar devices must not be used for flange connections.

24.6.2 Removal of Blank Flanges

Each tanker and terminal manifold flange should have a removable blank
flange made of steel or other approved material, such as phenol resin,
and preferably fitted with handles.

Precautions should be taken to ensure that, prior to the removal of blanks
from tanker and terminal pipelines, the section between the last valve and
blank does not contain oil under pressure. Precautions must also be
taken to prevent any spillage.

Blank flanges shall be capable of withstanding the working pressure of
the line or system to which they are connected. Blank flanges should
normally be of a thickness equal to that of the end flange to which they
are fitted.

348 © ICS/OCIMF/IAPH 2006