AzSPU SSOW Procedure For Op and Maintenance of Gas Detection Equipment (Fixed & Portable)

Procedure for Operation and Maintenance of Gas Detection Fixed & Portable Equipment Page 1 of 14
Procedure for Operation and Maintenance of

Gas Detection Fixed & Portable Equipment
AZSPU-HSSE-DOC-00052-2
This number supersedes UNIF-HSE-PRO-201-C1
Authority: AzSPU Safety & Compliance Custodian: Safety Systems/CoW Lead/Elman Shikhkerimov
Systems Manager/Yuliy
Zaytsev
Scope: AzSPU Document
Administrator: MS Document Coordinator
Issue Date: 05 October 2004 Issuing Dept: Safety & Compliance Systems
Revision Date: 25 January 2011 Control Tier: 2
Next Review 16 March 2011
Date:
Control Tier: <<2>> Revision Date: <<25 January 2011>>

Document Number: << AZSPU-HSSE-DOC-00052-2>> Print Date: 2/1/2011
PAPER COPIES ARE UNCONTROLLED. THIS COPY VALID ONLY AT THE TIME OF PRINTING. THE CONTROLLED
VERSION OF THIS DOCUMENT CAN BE FOUND AT http://docs.bpweb.bp.com/dkazspu/component/hssesms
TABLE OF CONTENTS
1. PURPOSE / SCOPE .............................................................................................................. 3

1.1 DOCUMENT PURPOSE .................................................................................................... 3
1.2 SCOPE .......................................................................................................................... 3
2 DEFINITIONS ................................................................................................................... 3
3 GENERAL REQUIREMENTS .......................................................................................... 4

3.1 LEGISLATION & STANDARDS .......................................................................................... 4
3.2 COMPANY REQUIREMENTS ............................................................................................. 4
3.3 STOPPING UNSAFE WORK.............................................................................................. 4
3.4 DEVIATIONS ................................................................................................................... 4
4 KEY RESPONSIBILITIES ................................................................................................ 5
4.1 SITE MANAGER / SITE CONTROLLER / OIM ..................................................................... 5
4.2 AREA AUTHORITY .......................................................................................................... 5
4.3 GAS TESTERS ............................................................................................................... 5
5 GAS DETECTORS........................................................................................................... 5
5.1 TYPE AND USE............................................................................................................... 5
5.1.1 All Gas Detectors .............................................................................................. 5
5.1.2 Fixed Gas Detectors ......................................................................................... 5
5.1.3 Portable Gas Detectors..................................................................................... 6
5.2 FIXED GAS DETECTION SYSTEMS ................................................................................... 6
5.2.1 Location and Use .............................................................................................. 6
5.2.2 System Failure .................................................................................................. 6
5.2.3 Lower Explosive Limits (Alarm and Shutdown Levels) ..................................... 6
5.2.4 Calibration ......................................................................................................... 7
5.3 PORTABLE GAS DETECTORS .......................................................................................... 8
5.3.1 Issue and Use ................................................................................................... 8
5.3.2 Gas Testers ...................................................................................................... 9
5.3.3 Operation .......................................................................................................... 9
5.3.4 Calibration ....................................................................................................... 11
6 KEY DOCUMENTS / TOOLS / REFERENCES ............................................................. 12

1. PURPOSE / SCOPE
1.1 DOCUMENT PURPOSE
This Safe System of Work provides the guidelines and procedures necessary to ensure a
safe working environment through the:
 Controlled and systematic monitoring for combustible gas using:

o fixed gas detection systems
o portable gas detection equipment
 Regular maintenance of gas monitoring equipment
 Use of suitably trained and authorised Gas Testers
1.2 SCOPE
The contents of this procedure are applicable to all BP owned and managed sites /
installations in Azerbaijan and Georgia. Contractors working on BP owned or managed
sites / installations are also responsible for alignment with this procedure.
This document does not replace the procedures prepared and adopted by specialist
contractors. Neither does it supersede any national and local regulatory requirements.
This procedure contributes to compliance with Group Control of Work (CoW) standard that
the Hazards associated with BP activities are identified and that the risks are assessed and
managed.
All guidelines contained shall be regarded as the minimum requirements for BP owned or
managed sites / installations in Azerbaijan and Georgia.
The scope covers defined activities of BP and Contractors at all BP AzSPU sites and
installations.
2 DEFINITIONS
Refer to document AzSPU-HSSE-DOC-00021-2 HSE Definitions for definitions common to
this Procedure. Definitions specific to the Procedure are included below.
SM Site Manager
SC Site Controller
OIM Offshore Installation Manager
AA Area Authority
SSOW Safe System of Work
AGT Authorised Gas Tester
COW Control of Work
CSE Confined Space Entry
ICC Isolation Control Certificate
L2RA Level 2 Risk Assessment
PTW Permit to Work
RTC Risk It, Talk It, Check It Pre-Task Risk Assessment
TRA Task Risk Assessment
TA Technical Authority
TBT Toolbox Talk
3 GENERAL REQUIREMENTS
3.1 LEGISLATION & STANDARDS

This procedure complies with applicable national law. Applicable national law is national law
as amended by project specific agreements, e.g. the ACG Production Sharing Agreement
(PSA), and relevant International Conventions, if any, in force in Azerbaijan or Georgia, as
applicable.
- Operating Management System OMS Essentials 3.2.1 and 4.5.1
In the absence of national legislation, or where national legislation is inconsistent with the
requirements of project specific agreements, BP Group Standards or applicable
requirements from UK or US legislation will be complied with.
Where requirements conflict, legal advice has been obtained and a defendable compliance
position adopted.
The standards and practices contained in this procedure are consistent with those
internationally recognized within the petroleum industry.
3.2 COMPANY REQUIREMENTS

It is a company requirement that all tasks are subjected to an assessment of risk to
demonstrate that risks have been reduced to as low a level as reasonably practicable
(ALARP). This can be achieved by complying with the Company’s existing standards.
Where compliance with Company standards cannot reasonably be achieved, a formal level
2 Risk Assessment will be undertaken to identify any additional controls and demonstrate
that risks remain as low as reasonably practicable, whether by compliance with Company
Standards or through level 2 Risk Assessment.
3.3 STOPPING UNSAFE WORK

To stop the continuation of potentially unsafe work at the earliest possible stage, the
Control of Work (CoW) Policy and this procedure for Gas Detection Equipment make it
very clear that all personnel are obliged and have the authority to “STOP” the work that
they consider to be unsafe.
3.4 DEVIATIONS
This procedure is written in sufficient detail that it should be able to be applied consistently
at all sites / installations. There may still be the requirement for some local rules covering
site / installation specific logistical/administrative arrangements and local variations in
responsibilities to reflect differences in organisational arrangements. These local rules
should not deviate from the core processes within this document. Any form of deviation
from this procedure, including but not limited to local rules, shall be requested and
authorised in accordance with SSOW, Procedure for Deviations (Doc. No: AZSPU-HSSE-
DOC-00011-2).

4 KEY RESPONSIBILITIES
4.1 SITE MANAGER / SITE CONTROLLER / OIM
The Site Manager / Site Controller / Offshore Installation Manager shall be responsible and
accountable for the application of this procedure in his area of responsibility, He shall
ensure:
 That adequate numbers of Competent responsible persons are appointed to manage
and maintain the requirements of this procedure
 Formally appointing suitably qualified and experienced persons to carry out:
o gas testing
o gas testing instrument calibration and testing
 Ensuring that fixed gas detection systems on the site / installation are maintained in
an operational state
 Ensuring that procedures are in place, to ensure gas testing is carried out wherever
necessary.
4.2 AREA AUTHORITY
Area Authorities are responsible for ensuring that gas tests are carried out within their area
of responsibility wherever there is any possibility that combustible gas might be present.
4.3 GAS TESTERS
Authorised Gas Testers are responsible for carrying out gas tests to the level to which they
are authorised.
5 GAS DETECTORS
5.1 TYPE AND USE
5.1.1 All Gas Detectors
Gas detectors shall:

 Be used wherever there may be a risk to people or property caused by the presence
of flammable and toxic gas
 Be designed to issue suitable audible or visual warnings that alert personnel to the
presence of flammable and toxic gas.
5.1.2 Fixed Gas Detectors
Fixed gas detectors are detectors that are permanently placed at strategic locations, and
where deemed appropriate by local management, to monitor conditions on a continuous
basis. In particular they are placed wherever it is thought that combustible gas could collect
following an uncontrolled and unplanned release.

Note: Fixed gas detection systems may initiate specific safety actions automatically.
5.1.3 Portable Gas Detectors
Portable gas detectors are often used during activities that take place where
flammable/toxic gas could exist, for example, in confined spaces. In most cases, the use of
portable gas detection equipment will be called for by the work procedure / instruction.
It is recommended to use Multi-Gas detectors such as Triple Plus + IR (Intrinsically Safe
Portable Monitors), or Tetra (Intrinsically Safe Personal Multi-Gas Monitor).
5.2 FIXED GAS DETECTION SYSTEMS
5.2.1 Location and Use
Fixed or automatic combustible gas detectors/systems may be used to initiate a number of

automatic safety actions, including:
 Visual and audible warnings of flammable and toxic gas
 Visual and audible fault signal
 Plant / equipment shutdown
 Operation of fire extinguishing systems
 Site/installation evacuation alarm.
5.2.2 System Failure

Any malfunction, abnormal condition, or failure of the fixed gas detection system that
prevents the safe operation of plant and machinery, shall initiate visual and audible fault
signal.
Note: When the facility operates on purchased electrical power, shutdown features
must incorporate adjustable time delays to prevent plant shutdown from short
duration power outages. Automatic restart systems shall be overridden by the
shutdown system.
Partially attended sites / facilities (those which are not manned 24 hours a day) must
have suitable provisions incorporated so that affected plant / equipment can be
automatically shutdown for 24 hours without causing damage to the facility.
In partially attended facilities, any malfunction, abnormal condition, or failure of the fixed
gas detection system that actuates a plant or machinery shutdown must also actuate a
visual enunciator. A remote signalling device must be actuated during unattended periods.
In fully attended facilities, each any malfunction, abnormal condition, or failure of the
fixed gas detection system that actuates a plant or machinery shutdown must actuate a
visual and audible alarm prior to the shutdown. These alarms must actuate sufficiently
ahead of each shutdown point to give time for corrective measures to prevent a shutdown.
5.2.3 Lower Explosive Limits (Alarm and Shutdown Levels)

Concentrations of combustible gases that will trigger alarms and shutdowns shall be as
follows. These are maximum set values. Set points may be lower.
Preferred solution
Voted gas detection system (eg 2003)
 One detector achieve 20% Lower Explosive Limit – Low alarm, actuate
alarms/enunciator
 Two detectors achieve 20% Lower Explosive Limit – High alarm, actuate trip
signal.
Non-preferred solution-required TA approval for new systems
Non-voted gas detection system (eg 1001)
 The detector achives 20% Lower Explosive Limit – Low alarm, actuate
alarms/enunciator
 Two detectors achieve 60% Lower Explosive Limit – High alarm, actuate trip signal.
Concentrations of toxic gases that will trigger alarms and shutdowns shall be as follows.
Exposure limits for common toxic gases
COSHH (UK)
Toxic Gas STEL (ppm) TWA (ppm)
CO 200 30
CO2 15 000 5000
H2S 10 5
HF 3 N/A(1.8)
5.2.4 Calibration
5.2.4.1 Frequency
Combustible gas detection systems shall be calibrated in accordance with the
manufacturer’s recommended procedures or at least every 6 months functional test/PM
shall be performed by authorized instrument or F&G technician which passed CAMS for
PMs.
Gas detectors are usually tested by using filter or gas from a test gas tank (2.5 %, 3.5%
and 4% methane in a nitrogen balance).
If failure functional test the detector will be replaced and returned to manufacture for
calibration/investigation.
Test Gas Tanks
Gas detectors are usually calibrated using gas from a calibration gas tank. It is a good
safety practice to install a tube from floor level to detectors placed at high levels and
ceilings. This permits introduction of the calibration gas through the tubes at ground level.
The contents of the test gas tank are under pressure. Therefore the following precautions
should be observed at all times:
 Do not allow oil, grease or flammable solvents to contact the flow control of the
calibration gas tank.

 Do not store calibration gas tanks near heat or fire, or in room used for habitation.
 When the tank is exhausted, discard in a safe place such as burial in the earth or in
sanitary landfill.
 Do not throw in fire or incinerate.
 Keep out of the reach of children.
 It is not permitted and it is hazardous to refill these gas tanks.
 Do not attach the test gas tank to any other apparatus other than described above.
5.2.4.2 Functional test/PM Records
Records must be maintained on the functional test/PM of these instruments at the site /
installation. Records should include the:
 Detector location
 Detector make/mode
 Detector type
 Date of functional test/PM
 Functional test/PM results
 Name of the person who completed the calibration
5.3 PORTABLE GAS DETECTORS
5.3.1 Issue and Use

5.3.1.1 Issue
Portable gas detectors must only be used:
 In accordance with the manufacturer’s instructions for determining the lower
explosive limit of combustible gas in the air
 By personnel trained in their use
 Where practicable be carried in their manufacturer suppliers’ leather cases
Note: On BP sites and installations in Azerbaijan and Georgia this means that
portable gas detectors may only be used by Authorised Gas Testers.
5.3.1.2 Use
Portable gas detectors, or explosimeters, use a set of batteries to measure the oxidation
rate of the combustible gas. This measurement is then read from a meter showing the gas
combustibility.
Portable combustible gas detectors shall be used when:
 Introducing flame into an area which may contain a flammable atmosphere.
 Lighting fired heater vessels.
 Issuing hot work permits.
 Doing all confined space entry work
 Leak seeking
 Verifying gas-free conditions
5.3.2 Gas Testers
Authorised Gas Testers are approved persons who have been trained and certified in gas
testing, they are authorised to test for the presence of flammable vapours, toxic gas and
oxygen as required in support of the Permit or Entry Certificate as requested by the AA.
Personnel required to operate portable gas detectors shall have completed the training
programme for Authorised Gas Tester Level 1, Level 2 or Level 3 and shall be formally
appointed by the Site Manager, Site Controller or Offshore Installation Manager for carrying
out gas test (see Safe System of Work AZSPU-HSSE-DOC-00012-2 Authorisation).
All training will be conducted by qualified personnel only and will be documented and kept
on file.
5.3.2.1 Gas Tester Level 1
Level 1 AGT’s are competent to carry out gas testing on all activities including Confined
Space Entry (CSE) activities. For confined space work the Level 1 AGT must retest the
atmosphere at the start of each shift, or when the work has been suspended for an
extended period within the shift.
Level 2 AGT’s are qualified to carry out gas tests in support of all activities excluding
Confined Space Entry & carry out continuous monitoring during ongoing work.
Level 3 AGT’s are individuals, usually the Performing Authority, who is approved by the
Site Manager / Site Controller / Offshore Installation Manager as having undergone
practical instruction on the use and interpretation of the results from both portable and
personal gas monitors. The AGT 3 has no authority to record gas test results the PTW:
their responsibility is only for continuous monitoring.
5.3.3 Operation
5.3.3.1 Personal Protective Equipment
Warning: It must be understood that testing an area because there is a possibility of

a hazardous condition, the person conducting the test must be protected
from the potential hazard and be properly equipped with the necessary
safety equipment.
5.3.3.2 Test Criteria
Testing procedures must conform to the following criteria.
 The test must be valid and accurate which means that the correct instrument of
known accuracy was used in such a manner as to give the true picture.
 The person using the instrument must make sure that the instrument is giving
reliable information and that it is interpreted correctly.
 The goal of the test is not to show vapours within certain limits but to show the actual

picture of the entire contents of the space. If the presence of a vapour is indicated,
the space or area must be re-evaluated to determine why, and corrective measures
must be taken before work proceeds.
 Field calibration records must be documented by the tester. This documentation
should include the serial number of the unit, the date and results of the calibration
and the name of the person performing the calibration/gas testing.
5.3.3.3 Test Location
Location is important because the hazard may be restricted to a small portion of the entire
volume. Therefore, it is important to test the whole volume. If the vapour or gas has a
specific gravity which is different from that of air, there may be lighter gases collecting at
the top of the space while the heavier ones will hug the floor and collect in pits and sumps.
Note: Most flammable gases are heavier than air and will settle in low-lying areas.
5.3.3.4 Reading Interpretation
The operator must always watch the meter while testing. The needle can quickly rise and
fall in a high concentration and come to rest on that part of the scale that would indicate a
safe reading, yet in actual fact, an extremely dangerous concentration could exist. This is
particularly evident when strong concentrations of explosive vapour are in an oxygen
deficient atmosphere.
Some instruments cannot be used in oxygen deficient atmospheres. In these cases
detector tubes will be used to give accurate readings, or alternatively, purpose made gas
detector for oxygen deficiency atmosphere can be used, e.g. Triple Plus + IR. Utilizing
infrared sensing technology Triple Plus + IR is suitable for both high gas concentrations
and for use on inert (oxygen free) backgrounds.
5.3.3.5 Handling Portable Gas Detectors
Sampling Hoses:
Select the correct sampling hose for the specific application and always use the shortest
length of sampling hose (this will minimize the possibility of vapours condensing in the
hose), with exception of vessel sampling, i.e. testing from door way.
Before Use:
Before use, check the:
 Calibration of the instrument to be sure it is reading accurately.
 Battery charge and/or zero adjustment periodically.
 Instruments for tightness
Purging:
Whenever a reading is obtained, purge the instrument in fresh air, and take a second test
to be certain of an accurate reading.
Purge the indicator by drawing in fresh air, even if another sample is not to be taken right
away, as this removes any possibility of contamination by corrosive gases in the
combustion chamber.
Restrictions in Use:

Warning: Do not remove the flashback arrestors from the instrument. They
prevent the explosion that occurs in the combustion chamber from
passing back to the mixture being sampled.
 Do not sample high temperatures with a cold instrument. Condensation may occur
and give a false reading. Whenever possible, the instrument must be at the same
temperature as the vapour being sampled.
 Do not use the indicator for sampling gasoline vapours containing TEL (tetrathylead,
liquefied lead additive) unless the indicator has been approved for this specific
application.
 Do not let the sampling hose or probe reach into a liquid.
 Do not adjust the voltage when a sample is in combustion chamber.
5.3.4 Calibration
5.3.4.1 Calibration
Generally the portable gas detectors will be calibrated every 6 month in accordance
with the manufacturers’ instruction. Usually this is performed by sending detector to
a 3d party/manufacture or calibrated by certified personnel at site. An additional
calibration may be required when one of the following has happened:
 Has been dropped
 Used in a highly contaminated environment
 Has been subjected to fluid entry
 Has been subjected to extreme temperature change
5.3.4.2 Before Use
Portable combustible, toxic, oxygen gas detectors shall be inspected and zero checked, in
accordance with the manufacturer’s instruction, prior to use.
Check detector has a valid calibration
Where built-in test facilities are provided, function of the detector shall be confirmed prior to
use (self-test).
All such tests will be done upwind, in a clean fresh air environment, away from the area to
be tested. The reasons for testing in this area are to ensure:
 The instrument is not contaminated and therefore may give false readings.
 That personnel are in a safe working environment
Note: Function tests do not replace calibration. Function tests are only used to
confirm operation of the sensor and alarms.
Warning: Using a butane lighter to activate the alarm during function testing is
dangerous

5.3.4.3 Records
Portable gas detectors will have calibrated sticker attached to them showing due date of
next calibration; carried out by properly trained and certified personnel amongst a staff.
Calibration and maintenance records must be documented by operating personnel and
maintained on file at the local field office.
Records must be maintained on the calibration of these instruments at the installation /
local field office. Records should include the:
 Detector make/mode
 Detector type
 Date of calibration
 Calibration results
 Name of the person who completed the calibration.
6 KEY DOCUMENTS / TOOLS / REFERENCES

This procedure shall, where appropriate, be used in conjunction with this suite of AzSPU
Procedures referenced below.
Document Number Title of Procedure

AZSPU-HSSE-DOC-00011-2 Procedure for Deviations
AZSPU-HSSE-DOC-00060-2 Procedure for Permit To Work
AZSPU-HSSE-DOC-00063-2 Procedure for Task Risk Assessment
AZSPU-HSSE-DOC-00048-2 Procedure for Energy Isolations-Electrical
AZSPU-HSSE-DOC-00049-2 Procedure for Energy Isolations-Process
AZSPU-HSSE-DOC-00013-2 Procedure for Confined Space Entry
AZSPU-HSSE-DOC-00015-2 Procedure for Control Of Over-rides Inhibits And Alarm
Disables
AZSPU-HSSE-DOC-00051-2 Procedure for Fire Prevention, Detection & Response
AZSPU-HSSE-DOC- 00002-2 Procedure for Control of Work

Revision/Review Log
Revision Date Authority Custodian Revision Details

05 October 2004 Alan McNulty Esmira Akhundova Initial Issue
30 September 2008 Central H&S Manager Central Safety TL General: The titled of the Procedure is
Alan McNulty Abbas Islamov changed to „Procedure for Operation and
Maintenance of Gas Detection Equipment
Throughout the Procedure the document

numbering for referred procedures has
been changed from UNIF to AzSPU.
The following inclusions made to Section

1:
1.2 Scope;
1.3 Legislation & Standards;
1.4 Company Requirements;
1.5 Stopping Unsafe Work;
1.6 Deviations;
1.7 Document Review;
1.8 SSOW Specific Cross References;
1.9 Language Facilitation
Section 2. Definition – is added.
Section 3. Roles & Responsibilities:

Changes made to Paragraph 3.1
Section 5. Fixed Gas Detection Systems

Along with “flammable gas” toxic one is
added taken into account.
Additional point is added to Paragraph 5.1.

Additional wording is added to Paragraph
5.2.
Considerable changes made to Paragraph
5.3 & sub-paragraph 5.4.1.
Sub-paragraph 5.4.2 is changed.
Section 6. Portable Gas Detectors.

Considerable changes made to Paragraph
6.2.
Sub-paragraph 6.2.3 Gas Tester Level 3 is
included.
New wording is added to Subparagraph
6.3.4., Reading Interpretation., in regard to
equipment used on oxygen deficiency
background.
Changes were made to Paragraph 6.4
regarding parties involved and terms of
calibrating.
Additional Appendix A is added:

Feedback and Improvement Suggestions

05 December 2008 Yuliy Zaytsev Adalat Mamedov Authority position/name and custodian
Safety & Compliance Central Safety TL name have changed to reflect org changes
Systems Manager in HSE&TD.
16 September 2009 Yuliy Zaytsev Niyaz Mamedov, The numbering of the whole procedure is
Safety & Compliance HSE Systems / CoW changed in accordance with requirements
Systems Manager Adviser of Standardized Document Control
Procedure Template (AzSPU-HSSE-DOC-
00026-2).
Additional point has been added to the

sub-paragraph 5.3.1.1, Issue;
Additional wording has been added to the

sub-paragraph 5.3.3.5, Handling Portable
Gas Detectors, regarding Sampling Hoses;
Wording has been slightly changed in sub-

paragraph 5.3.4.1, Calibration
25 January 2011 Yuliy Zaytsev Elman Shikhkerimov Section 3 General Requirements

Safety & Compliance Safety Systems/CoW Removed reference to Getting HSE right,
Systems Manager Lead Golden Rules and replaced with OMS,
Group requirements


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Procedure for Operation and Maintenance of Gas Detection Fixed & Portable Equipment Page 1 of 14

Procedure for Operation and Maintenance of

This number supersedes UNIF-HSE-PRO-201-C1

Control Tier: <<2>> Revision Date: <<25 January 2011>>

1. PURPOSE / SCOPE .............................................................................................................. 3

3 GENERAL REQUIREMENTS .......................................................................................... 4

Control Tier: <<2>> Revision Date: <<25 January 2011>>

1.1 DOCUMENT PURPOSE

 Controlled and systematic monitoring for combustible gas using:

TBT Toolbox Talk

3.1 LEGISLATION & STANDARDS

- Operating Management System OMS Essentials 3.2.1 and 4.5.1

3.2 COMPANY REQUIREMENTS

3.3 STOPPING UNSAFE WORK

Control Tier: <<2>> Revision Date: <<25 January 2011>>

4.1 SITE MANAGER / SITE CONTROLLER / OIM

4.2 AREA AUTHORITY

4.3 GAS TESTERS

5.1 TYPE AND USE

5.1.1 All Gas Detectors

Gas detectors shall:

5.1.2 Fixed Gas Detectors

Control Tier: <<2>> Revision Date: <<25 January 2011>>

5.1.3 Portable Gas Detectors

5.2 FIXED GAS DETECTION SYSTEMS

5.2.1 Location and Use

Fixed or automatic combustible gas detectors/systems may be used to initiate a number of

5.2.2 System Failure

5.2.3 Lower Explosive Limits (Alarm and Shutdown Levels)

Control Tier: <<2>> Revision Date: <<25 January 2011>>

Exposure limits for common toxic gases

Control Tier: <<2>> Revision Date: <<25 January 2011>>

5.3 PORTABLE GAS DETECTORS

5.3.1 Issue and Use

5.3.2 Gas Testers

Warning: It must be understood that testing an area because there is a possibility of

Control Tier: <<2>> Revision Date: <<25 January 2011>>

Control Tier: <<2>> Revision Date: <<25 January 2011>>

Control Tier: <<2>> Revision Date: <<25 January 2011>>

6 KEY DOCUMENTS / TOOLS / REFERENCES

Document Number Title of Procedure

Control Tier: <<2>> Revision Date: <<25 January 2011>>

Revision Date Authority Custodian Revision Details

Throughout the Procedure the document

The following inclusions made to Section

Section 2. Definition – is added.

Section 3. Roles & Responsibilities:

Section 5. Fixed Gas Detection Systems

Additional point is added to Paragraph 5.1.

Sub-paragraph 5.4.2 is changed.

Section 6. Portable Gas Detectors.

Additional Appendix A is added:

Control Tier: <<2>> Revision Date: <<25 January 2011>>

Additional point has been added to the