Page 147 - International safety guide for oil tankers and terminals

SHIP’S EQUIPMENT

that the different gas testing functions can be incorporated into a multi-function
gas measuring instrument.
---ใช้เพื่อการศึกษาเท่านั้น---
For descriptions of the various types of gas measuring instruments and their
uses, see Section 2.4.
งานห้องสมุด ศูนย์ฝกพาณิชย์นาวี
The gas measurement instrumentation on board a tanker should form a
comprehensive and integrated system that addresses all the necessary
applications identified by the operator. The instruments should be fit for the
task to which they are applied and users should be made aware of the
particular applications and limitations of each instrument.

Users of gas measuring instruments should be trained in the proper use of the
equipment, to a level suited to their work duties.

A sufficient number of gas measuring instruments should be available on
board the ship to meet all the identified requirements, whilst allowing for
instrument failures, servicing requirements and the capability of the ship’s crew
to undertake repair and certified re-calibration of the instruments.

8.2.4 Alarm Functions on Gas Measuring Instruments

Alarms should only be fitted to instruments that are to be used where an
audible warning is necessary, such as a personal gas alarm monitor. Analytical
ึ
instruments that are used to provide numerical values for gases and vapours
for dangerous space entry certification do not need to have an alarm function.
Instruments with an alarm capability should be designed so that the alarm
inhibit and activate function cannot be changed by the instrument operator.
This is to avoid the possibility of inappropriate or accidental inhibition of the
alarm function.

The use of different instruments for testing atmospheres for entry certification,
and for monitoring atmospheres with a personal monitor during the entry
operation, reduces the probability of an accident due to an instrument
malfunction. It is therefore recommended that the testing instrument is not also
used as the personal alarm instrument during the entry operation.

8.2.5 Sampling Lines
Sampling lines should be suitable for the intended service and be impervious
to the gases present in the atmospheres being monitored. They should also be
resistant to the effects of hot wash water (see Section 2.4.13).

8.2.6 Calibration
Calibration should not be confused with operational testing (see Section 8.2.7
below).

The accuracy of measurement equipment should be in accordance with the
manufacturer’s stated standards. Equipment should, on initial supply, have a
calibration certificate, traceable where possible to internationally recognised
standards. Thereafter, procedures for management of the calibration
certification process should form part of the on board Safety Management
System. These procedures may include on board calibration in line with the
manufacturer’s guidelines and/or equipment being periodically landed to a
recognised testing facility for calibration, either on a timed basis, or during the

© ICS/OCIMF/IAPH 2006 113