COSHH Assessment 16/03/2016, 10 : 50
-Reference Number : 0076
-Date : 21-Mar-2006
-Name : John Pillier
Division : Process Technology Group
Title of Procedure : Use of flammable gasses and flammable gas mixes EXCLUDES CARBON MONOXIDE
Location : D032, F120 and external gas cage
Summary of Activity : To suply upto 10 bar gauge pressure regulated gasses for use in reactors, analytical and thermal processing equipment
Description of Procedures : Changing and transporting full or empty gas bottles
Connecting and disconnecting bottle regulators
Expulsion of entrapped air by system venting to atmosphere
Connecting and disconnecting supply lines
Inspection of regulating equipment
Inspection of supply lines and connectors / joining methods
Disposal of gas
Substances Used : 100% Hydrogen and variuos gas mixtures containing hydrogen
100% hydrocarbon, of either single species or mixed species, and various gas mixes containing hydrocarbons
Quantities and frequency of use : Upto 500ml/min per gas per average working day
Identify hazards : Entrapment injuries from moving or falling bottles
Gas leaks
Failure of regulating equipment
Inhalation : Yes
Ingestion : No
Splash in eyes or mouth : No
Identity of groups of workers with increased risk : N/A
Measures to control the risk : ENTRAPEMENT
Reduce risk by securing all bottles to a suitable immovable object or secure within a bottle carrier.
Minimize manual handling by using bottle carrier for transporting bottles and use safety footwear to prevent foot / toe injuries.
REGULATOR FAILURE http://www2.warwick.ac.uk/fac/sci/eng/local/hands/coshhview?coshhnum=0076&show=hydrogen Page 1 of 2

COSHH Assessment 16/03/2016, 10 : 50
Visually inspect regulators and replace worn or damaged parts. Ensure system design can withstand full bottle pressure. Contain friable elements inside other robust systems or install pressure relief devices.
GAS LEAKS
After refitting a pressure regulator or amending gas supply set up always use � leak detector spray �
(NOT soapy water) to check for gas leaks. Tighten using propriety tool and hand force only. If leak persists isolate gas then strip and remake / replace connection
Engineering control measures : Pressure relief devices
Lab coat : Yes
Gloves : No
Eye or Face : Yes
Other : Safety spectacles
Containment : N/A
Additional control measures : N/A
Waste disposal procedure : Unused or partially used bottles return to B.O.C
Process gasses to be vented externally, above head height, to atmosphere
Emergency procedures : N/A
Checks on control measures : On every bottle change visually inspect condition of pressure gauges for moisture ingress and dial not zeroing, check regulator body for corrosion, physical damage to bottle stem and nut causing burring of the hexagon nut.
Weekly, visually inspect condition of supply lines for evidence of nicks, cuts, abrasion and damage caused by entrapment or kinking of supply lines
Environmental monitoring : N/A
Health surveillance required : N/A
Training requirements : Instruct in correct handling and fitting of regulators and leak checking procedure
Name of Assessor : John Pillier
Page contact: Caroline Farren http://www2.warwick.ac.uk/fac/sci/eng/local/hands/coshhview?coshhnum=0076&show=hydrogen
Student intranet
Staff intranet
Site A-Z
Last revised: Thu 2 Mar 2006
Page 2 of 2