Page 308 - International safety guide for oil tankers and terminals

INTERNATIONAL SAFETY GUIDE FOR OIL TANKERS AND TERMINALS

The Emergency Release System (ERS) valves above and below the
Emergency Release Coupling (ERC) are hydraulically or mechanically
---ใช้เพื่อการศึกษาเท่านั้น---
interlocked to ensure they close fully prior to ERC operation.

Once the emergency disconnection has been initiated, the valves
manufacturers. Hose should be of a grade and type suitable for theิชย์นาวี
adjacent to the PERC will close rapidly (typically in less than 5 seconds)
and therefore precautions need to be taken to avoid a pressure surge
(see Section 16.8). It is usual for the terminal to provide surge control
facilities for this purpose, but if these are not available then special
operating procedures may be necessary.

18.2 Cargo Hoses

งานห้องสมุด ศูนย์ฝกพาณ
18.2.1 General
Oil cargo hose should conform to recognised standard specifications, or
as recommended by OCIMF and confirmed by established hose
service and operating conditions in which it is to be used.

Special hose is required for use with high temperature cargoes, such as
hot asphalt, and also for use with low temperature cargoes.
ึ
The information on cargo hoses in the following Sections (18.2.2 to
18.2.5) is condensed from British Standards BS EN 1765 and BS 1435-2
(‘Rubber Hose Assemblies for Oil Suction and Discharge Services’). It is
provided to give a general indication of hoses that may be supplied for
normal cargo handling duty, commonly referred to as ‘dock hoses’.

Reference may also be made to the OCIMF publication ‘Guide to
Purchasing, Manufacturing and Testing of Loading and Discharge Hoses
for Offshore Moorings’ for information on hoses commonly used at
conventional buoy and single point mooring (SPM) facilities.

18.2.2 Types and Applications

For normal duty, there are three basic types of hose:

Rough Bore (R)
This type of hose is heavy and robust with an internal lining supported by
a steel wire helix. It is used for cargo handling at terminal jetties. A similar
hose is made for submarine and floating use (type R x M).

Smooth Bore (S)
Smooth bore hose is also used for cargo handling at terminal jetties, but
is of lighter construction than the rough bore type and the lining is not
supported by a wire helix. A similar hose is made for submarine and
floating use (type S x M).

Lightweight (L)
Lightweight hose is for discharge duty or bunkering only, where flexibility
and light weight are important considerations.

All of these types of hose may be supplied as either electrically
continuous or electrically discontinuous.

274 © ICS/OCIMF/IAPH 2006