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H2S
Alarm Condition III
Gas concentration of 50 ppm or more is EXTREME DANGER TO LIFE.
All non-essential personnel will prepare for evacuation.
Note: From the time Alarm Condition III is a fact, no
unauthorized personnel will be allowed to enter the shaker area, cellar deck or mud pump room.
Notes and Information
The acceptable concentration for 8 hours exposure to H2S is 20 ppm.
Hydrogen-sulphide is heavier than air,
colourless and forms an explosive mixture with air between 4.3 and 46% by volume. One breath of 1,000 ppm concentration
H2S will result in death within minutes.
The "Buddy System" Whenever H2S is suspected, personnel must wear breathing apparatus before entering the
contaminated area and MUST have a "back-up man" (buddy), also with breathing apparatus, available.
Safe Briefing Stations
The Barge Captain will indicate these on the rig "black-board".
There will be two
briefing stations so that one is always upwind of the drilling rig. Spare
air bottles will be stored at the "safe briefing area" and bottles must
only be changed at this point.
The "NO SMOKING RULES" will be followed outside all living quarters as soon as "Alarm Condition 1" has been put into force.
As the above
introduction stated, we are drilling in a very dangerous area with a very
dangerous gas. As every man on the rig at all times will have to be ready
for H2S, and must be trained accordingly.
The rig has to be
equipped with sufficient breathing equipment for all personnel onboard.
This should include the maximum of service people that could be at the
rig at any one time.
As the accurate
function of the facemask depends on how airtight the mask seals to your
face, you will be asked to remove your beard (facial hair) or assume
responsibility for risk of death or serious bodily harm.
Alarm Condition
Killing the well with weighted mud, dumping gas cut mud through poor boy degasser and possum belly.
All rig personnel will wear breathing apparatus.
Non-essential personnel will leave the rig floor for "safe briefing area".
Crane driver will
Lay down crane not required.
Pick up walkie-talkies and distribute to rig floor and
Barge Captain and Toolpusher. All radios to be on stand-by Channel 13.
Assist boatswain with anchor winches.
Check personnel basket on upwind side. Stay in contact with rig floor for possible extra personnel.
Barge Engineer will
Set all anchor winches and clutches in gear and check for sufficient power to winch.
Place a walkie-talkie Channel 13 at each anchor winch control house.
Check with portable gas detector that upwind
crane deck
is free of H2S.
In case of evacuation, boatswain will assist
crane driver
at upwind crane.
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