Page 148 - International safety guide for oil tankers and terminals

INTERNATIONAL SAFETY GUIDE FOR OIL TANKERS AND TERMINALS

ship’s refit, or when the accuracy of the equipment is considered to be outside
the manufacturer’s stated accuracy.
พื่อการศึกษาเท่านั้น---
Calibration certificates, showing the instrument’s serial number, the calibration
date and the calibration gas or the method of calibration used, together with
used.งสมุด ศูนย์ฝกพาณิชย์นาวี
reference to applicable standards, should be provided for retention on board.
Instruments are typically calibrated using a calibration gas consistent with the
use of the instrument, such as propane or butane. The calibration gas used
should be marked on the instrument.

The use of an inappropriate gas for calibration could result in erroneous
readings during operation, even though the instrument appears to be operating
correctly.

Instruments should only be dismantled by persons who are qualified and
certified to carry out such work.

8.2.7 Operational Testing and Inspection
Gas measuring instruments should be tested in accordance with the
manufacturer’s instructions before the commencement of operations requiring
their use. Such tests are designed only to ensure that the instrument is
working properly. They should not be confused with calibration (see
ึ
Section 8.2.6 above).

Instruments should only be used if the tests indicate that the instrument is
giving accurate readings and that alarms, if fitted, are operating at the
pre-determined set points.

Physical checks should include:
---ใช้เ
Hand pump.

Extension tubes.
Tightness of connections.
Batteries.
Housing and case.
Instruments not passing these operational tests should be re-calibrated before
งานห้อ removed from service and clearly labelled to denote that they are not to be
they are returned to operational use. If this is not possible, they should be

During operations, it is important to check the instrument and sample lines for
leakage occasionally, since the ingress of air will dilute the sample and give
false readings. Leak testing may be carried out by pinching the end of the
sample line and squeezing the aspirator bulb. The bulb should not expand as
long as the sample line is pinched.

During extended operations, the ship operator should determine the frequency
at which operational checks should be made. The results of the tests and
inspections should be recorded.

These procedures should be documented in the Safety Management System
(see Section 9.2).

114 © ICS/OCIMF/IAPH 2006