Page 301 - International safety guide for oil tankers and terminals

TERMINAL SYSTEMS AND EQUIPMENT

impressed current system takes many hours to decay after the system
has been switched off, so the ship would have to be deprived of full
---ใช้เพื่อการศึกษาเท่านั้น---
protection, not only while alongside but also for a period before arrival in
port.

งานห้องสมุด ศูนย์ฝกพาณิชย์นาวี
17.5.3 Sea Islands
Offshore facilities that are used for tanker cargo handling operations
should be treated in the same way as shore terminals for the purpose of
earthing and bonding, i.e. either an insulating flange or non-conducting
hose should be used as appropriate.

It should be noted that switching off a cathodic protection system is not a
substitute for the installation of an insulating flange or a length of
non-conducting hose.

17.5.4 Ship/Shore Bonding Cables
A ship/shore bonding cable does not replace the requirement for an
insulating flange or hose as described above. Use of ship/shore bonding
cable may be dangerous and should not be used.

ึ
Although the potential dangers of using a ship/shore bonding
cable are widely recognised, attention is drawn to the fact that
some national and local regulations may still require a bonding
cable to be connected.

If a bonding cable is insisted upon, it should first be inspected to
see that it is mechanically and electrically sound. The connection
point for the cable should be well clear of the manifold area. There
should always be a switch on the jetty in series with the bonding
cable and of a type suitable for use in a Zone 1 hazardous area. It
is important to ensure that the switch is always in the ‘off’ position
before connecting or disconnecting the cable.

Only when the cable is properly fixed and in good contact with the
ship should the switch be closed. The cable should be attached
before the cargo hoses are connected and removed only after the
hoses have been disconnected.

17.5.5 Insulating Flange

17.5.5.1 Precautions

See Figure 17.1 for a schematic diagram of a typical insulating
flange joint.
Points to be borne in mind when fitting an insulating flange are:
When the ship-to-shore connection is wholly flexible, as with a
hose, the insulating flange should be inserted at the jetty end
where it is not likely to be disturbed. Then the hose must
always be suspended to ensure the hose-to-hose connection

© ICS/OCIMF/IAPH 2006 267