WORK PERMIT. A.K.SINGH, SAFETY MANAGER INDIANOIL CORPORATION LTD. BARAUNI REFINERY, INDIA. ROAD MAP. The session will include the following: Presentation on BR Work Permit system followed by discussion Role of Issuing & Executing Authority Exercise how to fill the permit
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A.K.SINGH, SAFETY MANAGER
INDIANOIL CORPORATION LTD.
The session will include the following:
Permit is required for the following jobs :
SIX MONTHS BASIS / MAX I YEAR
7 types of work permit with specific colors.
HOT WORK & VEHICLE ENTRY PERMIT (Pink, light green & white) For use of or generates local source of ignition,vehicle & engine operated equip. entry to hazardous areas.
CLEARENCE & COLD WORK PERMIT (YELLOW & WHITE)
BR: F&S: FR:2
(For all general maint. works (no ignition source)
DYKE CUTTING & EXCAVATION PERMIT(PINK ,light green & white)
ROAD CUTTING & BLOCKAGE PERMIT (PINK & , yellow & light green)
VESSEL ENTRY/VESSEL BOX UP/EXCAVATION (yellow & white)
For personnel entry into confined space. BR: F&S:FR:14
WORK AT HEIGHT PERMIT (yellow & white) BR:F&S:FR:17
RADIATION WORK PERMIT( PINK & WHITE) BR:F&S:FR:18
Work Permit form generally consists of the following features:
THE ORIGINIAL AND COPIES
HOT WORK PERMIT
RENEWABLE AFTER AUTHORISATION FROM HOD.RENEW AT FIRE STATION ON EXTENSION.
Why gas test is required ?
Hazards involved -
Common flammable gases/liquids in refinery are -
COMMON TERMINOLOGIES :
For flammable substances:
Minimum temp. at which a liquid gives off sufficient vapor to form an ignitable mix. It will give a flash, flame will not continue.
Auto Ignition Temp.:
The lowest temp. to which a substance will ignite without a spark or flame.
The concentration range of vapor in air when propagation of flame(ignition) occurs in presence of an ignition source.
The minimum concentration of vapor to air required to propagate(ignite) flame.
The maximum vapor to air conc.above which propagation of a flame will not occur(will not ignite).
Material LEL UEL F Pt.(C) AIT(C)
Hydrogen 4 75 Gas 585
Methane 5 15 Gas 538
Propane 2 9.5 - 104 466
Naphtha 1.1 5.9 - 18 288
ATK/ATF 0.7 5.0 35-50 210
Diesel 0.7 5.0 32-96 256
Fuel Oil 1 5.0 66 262-407
Toxic substances :
TLV (Threshold Limit Value / PEL(Permissible Exposure Limit) :
The maximum permissible conc. of a toxic substance to which exposure of a person will have no adverse effect on health for working 8 hrs per day.
STEL(Short Term Exposure Limit) :
Maximum conc. to which worker can be exposed for a period of 15 mins. without any adverse effect to health.
IDLH(Immediate Danger to Life & Health)
Highly toxic, combustible, colorless.
Smells like rotten egg.
EFFECTS ON HUMAN BODY
Can be smelled as rotten egg 0.13
Smelling sense will dry within 150 - 200
2 mins, burning sensation in
eye & throat
IDLH(Loss of smelling sense, 300
heavy breathing, dizziness,
headache,and total collapse
within 1 to 4 Hrs)
problem and total collapse within 30 to
PHYSICAL EFFECT CONC(PPM)
Slow down of heart beats, 700
heavy breathing with coughing,
then death, if not rescued
Fatal emergency over 700
Explosive limits : 4.6 to 46%, it gives blue flame when ignited.
FIRST AID :
IF INHALED -
Remove exposed person to fresh air and administer oxygen immediately.
Use fresh air mask in case conc. exceeds 10 PPM
TOXIC AS WELL AS FLAMMABLE
TLV - 50 PPM
STEL - 400 PPM
IDLH - 1500 PPM
LEL - 12.5%
UEL - 74 %
CO combines with hemoglobin of blood and make it unable to carry oxygen.
Symptoms : Headache, dizziness to unconscious and ultimately death.
First Aid :
Remove to fresh air and apply oxygen at the earliest.
TOXIC GAS TLV STEL IDLH
NH3 25 35 -
SO2 2 5 -
CL2 0.5 1 30
For hot work the gas test results shall be :
( Preferably NIL)
For confined space entry :
Confined space With BA protection :
However, no hot job can be carried out inside the confined space at this condition.
‘DO NOT OPERATE’ tag shall be used when isolation by local switch is decided as adequate protection.
Multi-lock systems to be used when different crafts are involved.(this is towards best safety practices)
An Auditor shall check the following: