Methanol, Glycol injection
Methanol, Glycol injection
(OP)
This question might have a simple answer I do not know. Why where there is a high pressure drop across a PSV or PCV, they inject glycol or methanol upstream of the device?
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Methanol, Glycol injection
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RE: Methanol, Glycol injection
Hopefully you can eloborate a little.
If it exists a small "java scetch" application would really benefit this site
Best regards
Morten
RE: Methanol, Glycol injection
I also have not seen this for a pressure relief valve (PSV).
RE: Methanol, Glycol injection
Thank you guys for your reply. MortenA, the answer to your question is affirmative. PSV is pressure safety valve and PCV stands for pressure control valve.
TDK2,
I know that the dp accross the PCV creates hydrate downstream of the valve. Why they don't inject MEG or Methanol downstream then?
When I was working in Iran in sour gas compressor station, I ran into a case where a 1" Methanol injection line was connected to upstream of a PSV which was installed on the composite gas K.O.D.
Rgds,
M.E
RE: Methanol, Glycol injection
RE: Methanol, Glycol injection
The injection rates on a volumetric basis are pretty low typically if you think about it.
RE: Methanol, Glycol injection
RE: Methanol, Glycol injection
You can ask for the simulation cases of your plant to the process engineering department, and you would learn more about hydrate formation across PCV`s, Injection rates, temperature and pressure conditions that promotes the hydrate formation
Hope this would help you.
My best regards from Venezuela !!
RE: Methanol, Glycol injection
All the best.
RE: Methanol, Glycol injection
About injection methanol upstream of PCV. Once we had accident with PCV, because of leaking it hydrated. One of possible solution this problem proposed to inject methanol upstream of PCV.
Best regards.
RE: Methanol, Glycol injection
Could you please rephrase "because of leaking it hydrated"?
Do you mean you had a leak upstream of PCV and you had ice formation around it?
Thanks
RE: Methanol, Glycol injection
Yes. It didn't look like ice. We didn't make special analysis for it. That plug looked like hydrate. The 4" outlet pipe was completly blocked that half metre plug.
Best regards.