Rank: New forum user 
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Hi all,
I am helping my Project Manager to carry out a risk assessment and setting out a Method Statement to cut a pipe that normally carried kerosene. The valves at the two extremities of the pipe will be closed off and the pipe drained (not sure if 100%). acold cutter will be used to cut the 6" nomimal diameter pipe.
I am loooking for suggestions of hazard and risks associated with the operation. we have though of the obvious but we don't want to miss anything given the flammability nature of the liquid and possibly vapour still present in the pipe.
The pipe is not in a confined space. It connects to a pump on one end and to three kerosene tanks on the other end.
Any help would be appreciated.
Thanks.
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Rank: Super forum user 
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Rank: Super forum user 
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ron hunter wrote:fill it with water?
Makes good sense to me
"cold cutting" is difficult to be spark free & any vapours are your enemy
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Rank: New forum user
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Thanks Ron and Walker. Not a bad idea to fill it it water. Only question is how do you make sure you get all the water out before filling the pipe with kerosene again. kerosene may be used as fuel jet so not want to contaminate with water.
We occassionally use the cold cutting technique on gas pipes - basically has water constantly flowing around the blades.
We were thinking of having a constant flow of Nitrogen or C02 through the pipe while we cut.
Also do we need to ground the pipe agaisnt static. it's a steel pipe.
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Rank: Super forum user
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Yeah but
If vapour releases under pressure -is the equipment motor Intrinsically protected.
THere musdt be a industry approve best practice -I'm saying no more as I'm out of my depth
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Rank: Super forum user 
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Why not contact an approved contractor, there must be some around that specialise in that type of work?
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Rank: Super forum user
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Why not remove the spool piece to a safe area then work on it?
Notrogen or CO2 is going to add to the hazards and risks
David
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Rank: Forum user 
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If the pipe is filled with water then you let the pipe's remaining water and kerosene evaporate before re attachine, both products should evaporate quite readily if you apply enough heat?
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Rank: Forum user
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rockybalboa wrote:If the pipe is filled with water then you let the pipe's remaining water and kerosene evaporate before re attachine, both products should evaporate quite readily if you apply enough heat?
*attaching
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Rank: Super forum user
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Rank: Forum user
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Just make sure you cut the blue wire. =)
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Rank: Super forum user 
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We haven't been told how long the section that will be drained is, its profile or the local environment.
Water and aviation kerosene are never good bedfellows and raise a whole raft of issues not the least of which is how you would introduce it and recover it for proper disposal.
As Ron suggests responses to this one is for those with experience in this area; this sort of thing is a routine maintenance matter with the work plan and the detail very much depends on the local conditions and environment in which it is carried out.
p48
klungtoo, you have pm
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Rank: Super forum user
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Doh! "dependant" not "depends"
p48
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Rank: Super forum user
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Those that can do, those that can't teach!
This could be altered in this situation to "Those that can do, those that can't ask how to"?
Personally I would be very reluctant to carry out such a task considering the potential for great harm when just receiving advice from this forum. If I were to risk assess this task right now I would result in High Risk.
Not saying the advice is good or otherwise I would recommend an expert.
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Rank: New forum user
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ChrisBurns wrote:Those that can do, those that can't teach!
This could be altered in this situation to "Those that can do, those that can't ask how to"?
Personally I would be very reluctant to carry out such a task considering the potential for great harm when just receiving advice from this forum. If I were to risk assess this task right now I would result in High Risk.
Not saying the advice is good or otherwise I would recommend an expert.
Thanks for your replies all. Mostly helpful.
"Those that can, do; those that can't, ask how to" very wise.
Everything starts somewhere, everybody learns, and with experience becomes an expert in a field. There is always risks involved in business - its all about managing that risk and recognising limitations..
Thanks all for your help.
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