OCM2 - Local exhaust ventilation (LEV)

Health and Safety Executive

OCM Local exhaust ventilation (LEV) Offshore COSHH Control approach 4 essentials Special advice

This information will help offshore What this sheet covers dutyholders (owners, operators and This sheet describes good practice for checking, maintaining and contractors) to comply with the Control testing local exhaust ventilation (LEV) equipment to control gas, vapour, of Substances Hazardous to Health fume or dust. Regulations 2002 (COSHH), as amended, Air mover to protect workers’ health. This guidance consolidates good control practice and reinforces existing knowledge with Discharge additional information. It will help you carry out COSHH assessments, review existing assessments, deliver training and in Air cleaner Ducting supervising activities involving substances hazardous to health. Hood

It is aimed at staff whose responsibilities include the management of substances Inlet hazardous to health on offshore installations (eg occupational health Local exhaust ventilation should: specialists, COSHH assessors, supervisors n collect or contain the airborne contaminant;

etc). It is also useful for trade union and n carry it away from workers for treatment and/or discharge to a safe

employee safety representatives. Following place; and the guidance is not compulsory and you n ensure adequate control of exposure and, where applicable, below

are free to take other action. But if you relevant workplace exposure limit (WEL). do follow this guidance you will normally Loss of LEV control can lead to ill health. be doing enough to comply with the law. Health and safety inspectors seek to secure Checking and maintaining existing LEV compliance with the law and may refer to this guidance as illustrating good practice. 3 You need to know that the system is performing to its design specification.

If you need a service provider (eg 3 The LEV user manual and logbook should set out the frequency of checking, maintenance and parts replacement. consultant), OCM sheets describe what they should deliver. You should plan LEV 3 If the LEV has no user manual or performance data, hire a competent ventilation engineer and occupational hygienist to determine the checking and maintenance. performance needed for adequate control.

Operators and supervisors need training 3 Checks and maintenance cover four types of parts: n moving parts that wear, eg fan bearings, filter shakers; to use LEV systems. You may need help n hoods, ductwork and seals that can get damaged; from a ventilation engineer or occupational n parts that deteriorate with use, eg filters, flexible ducting; and hygienist for commissioning and statutory n items needing regular attention, eg filter bins, sludge collectors. testing of LEV. The report should cover the points in this sheet. 3 Make sure relevant COSHH assessment for cleaning and maintenance is carried out.

Local exhaust ventilation (LEV) OCM2 Special advice

3 Make sure everyone knows who is responsible for what checks, and for completing the records.

Caution: You may need to use permit-to-work procedures.

Thorough examination and test 3 Most LEV needs a statutory test at least once every 14 months to make sure it works well. Exceptions to this are given in Schedule 4 of the COSHH Regulations. 3 The test must be done by a competent person, testing against standards in the LEV commissioning report.

Action 3 Implement the report recommendations. 3 Keep records of all examinations and tests for at least five years. Caution: The thorough examination and test can be used by an employer as an audit of the past year’s LEV system management. A long list of actions arising from this test shows that your checking and maintenance are not thorough enough.

Training 3 Training covers: n How the LEV system works. n How to use the LEV to get the best out of it. n How to check that the LEV is working.

n What to do if something goes wrong.

3 Keep training records. 3 Changes to the work process and LEV means that staff may need retraining.

New LEV 3 Use a reputable LEV supplier, with experience of the type of control that you need. 3 Ask LEV suppliers how they will prove that their system will control exposure adequately. 3 LEV is rarely straightforward and mistakes are costly. Installation and commissioning The LEV supplier should give you three documents:

3 A user manual describing what the LEV is designed to control, and how it achieves control. It should also contain the following: n the LEV description, with diagrams; n the LEV performance from commissioning;

n checks, maintenance and parts replacement schedules;

n description of the statutory ‘thorough examination and test’ and

exposure targets; n signs of wear and control failure to look out for;

n description of how operators should use the LEV so it works

effectively; and n list of replaceable parts.

Local exhaust ventilation (LEV) OCM2 Special advice

3 A logbook that includes: Further information n schedules for regular checks and maintenance; Clearing the air: A simple n records of checks, maintenance, replacements and repairs; guide to buying and using n checks that the LEV is being used in the right way; and local exhaust ventilation (LEV) n the name of the person making the checks. INDG408 Leaflet HSE Books 2008 (priced packs of 25 3 A commissioning report that includes: ISBN 978 0 7176 6300 2) n diagrams and a description of the LEV, including test points; www.hse.gov.uk/pubns/ n details of the LEV performance specification; indg408.pdf n results, such as pressures and air velocities at stated test points; Controlling airborne n calculations made; contaminants at work: A guide n written descriptions of commissioning, the tests made, and the to local exhaust ventilation (LEV) outcome along with any air sampling results; and HSG258 HSE Books 2008 n a description of how operators should use the LEV so that it works ISBN 978 0 7176 6298 2 effectively. www.hse.gov.uk/pubns/books/ hsg258.htm 3 If any of these is missing, your LEV needs recommissioning to produce a user manual, a logbook and a commissioning report. Useful links 3 The LEV also needs recommissioning if it is changed in any way. Occupational Safety and Health Consultants Register www.oshcr.org/

Independent National Inspection and Testing Association www.inita.org.uk/

Further information www.hse.gov.uk/lev/

You can find the full Offshore COSHH essentials series at www.hse.gov.uk/coshh/index.htm

This guidance was developed by representatives from the UK offshore oil and gas industry and trade unions, with HSE.

© Crown copyright 2011 Published by the Health and Safety Executive 03/11