recip compress blowdown on esd
recip compress blowdown on esd
(OP)
I have a recip compression train offshore. It always blows down after a trip so gas inventory lost. Why must it always blowdown?
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recip compress blowdown on esd
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RE: recip compress blowdown on esd
I've never set up a compressor to blow down on a trip. I've been involved in situations where recips were belown down on an ESD when the ESD strategy is to blow the entire station down on ESD, but that strategy is not universal.
David Simpson, PE
MuleShoe Engineering
"Belief" is the acceptance of an hypotheses in the absence of data.
"Prejudice" is having an opinion not supported by the preponderance of the data.
"Knowledge" is only found through the accumulation and analysis of data.
RE: recip compress blowdown on esd
You can also propose that it be changed after looking into the what effects the change would have and go through your MOC (management of change) procedure. Documentation such as cause and effects, procedures, training would have to be updated, basically any designated key documents that would need to be updated.
RE: recip compress blowdown on esd
How about this one,
BECAUSE IF YOU DON'T DO IT
YOU ARE VIOLATING FEDERAL LAW!
CFR 192.167
And see API RP14C
Recommended Practice fo Analysis, Design, Installation and Testing
of Basic Surface Safety Systems
for Offshore Production Platforms
Sheet 5 of 6 Page 83
"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek
RE: recip compress blowdown on esd
How about this one.
Piper Alpha
"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek
RE: recip compress blowdown on esd
David Simpson, PE
MuleShoe Engineering
"Belief" is the acceptance of an hypotheses in the absence of data.
"Prejudice" is having an opinion not supported by the preponderance of the data.
"Knowledge" is only found through the accumulation and analysis of data.
RE: recip compress blowdown on esd
I personally do not know of ANY REGULATED compressor station that does not blow down on ESD, offshore, or onshore. Some unregulated, mini HP, field compressor, in some podunk gathering system, with a population of 12 cows, go for it. I like a good BBQ just as much as the next guy.
"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek
RE: recip compress blowdown on esd
RE: recip compress blowdown on esd
Useless? USELESS? Well, being that the OP now knows that further actions may be potentially illegal, not to mention dangerous, I wouldn't say that the thread was entirely useless.
And we hopefully learned not to give what can be preceived as well founded advice, based on years of experience, on such sensitive topics, especially when the advisor isn't aware of the full details. IMO the best course of action in such cases is to convince them into leaving it alone completely and, or, recommend that he find somebody who is qualified to troubleshoot the system and rectify it properly, rather than in any way, shape or form, potentially encourage them to switch off what may be an essential safety system.
I wouldn't say that the thread is pointless, if the OP now realizes that acting without knowledge and some serious thought in this matter at hand could be a very, very bad idea and that we also learn to think of the consequences that our advice might bring especially when involving serious safety concerns. After all, this isn't a question about pressure loss of a micro psi or two going around some 2" elbow.
"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek
RE: recip compress blowdown on esd
RE: recip compress blowdown on esd
For a centrifugal machine, it is acceptable to leave the machine pressurised then restart. I don't think this can be done in a recip and want to undertstand why.
RE: recip compress blowdown on esd
"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek
RE: recip compress blowdown on esd
Now, we're dealing with dry, pipeline quality gas, not gas that may have a fairly high dew point temperature, as it seems you have. With rich gas, I can only imagine a couple reasons why you would blow down upon each shutdown would to be to limit the amount of condensate build-up in the piping, bottles or cylinders, which could be, however unlikely, an issue on start-up (hydro-testing a cylinder). Or perhaps maybe to protect soft parts like o-rings, etc from degradation, but most materials used are pretty resistant to normal gas components. So, those would be my guesses as to why the compressor was set up to operate in that way. I would back-track the project to the automation guys, the project manager/engineer, to see what the reason for that may be (if those people are still around).
RE: recip compress blowdown on esd
"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek
RE: recip compress blowdown on esd
"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek
RE: recip compress blowdown on esd
(1) It must be able to block gas out of the station and blow down the station piping.
It must be able to block gas and blow down, it is not mandatory that this happens automatically.!!!!
RE: recip compress blowdown on esd
RE: recip compress blowdown on esd
Interesting to know about the liquids buildup. Thanks for that info.