Building HRSGs at minus 50C
Building HRSGs at minus 50C
(OP)
We are about to become involved with a CCGT project that will be built under winter conditions when the temperatures can fall to minus 50C.
We have considered storing the boiler pressure parts in heated warehouses and erecting the HRSGs in a building with a sliding roof or similar through we can lower the tube banks within supporting frames. The roof would be closed except for the times when pressure parts are being lowered into place.
Does anyone have anyother ideas.
Regards,
athomas236
We have considered storing the boiler pressure parts in heated warehouses and erecting the HRSGs in a building with a sliding roof or similar through we can lower the tube banks within supporting frames. The roof would be closed except for the times when pressure parts are being lowered into place.
Does anyone have anyother ideas.
Regards,
athomas236





RE: Building HRSGs at minus 50C
RE: Building HRSGs at minus 50C
Thanks for comment and advice on vodka.
Best regards,
athomas236
RE: Building HRSGs at minus 50C
Please note however stress considerations for thermal expansion and contraction are seperate, you dont want to have it all bolted in place at -50 and then run it at +100 that would get mess with the expansion.
In short store it however you want, just dont do final bolt up or start up until you have warmed the steel up a point above its MDMT.
RE: Building HRSGs at minus 50C
My concerns are that during lifting and moving into place stresses could arise that would cause brittle fracture. A further concern is that during welding there could be temperature differences that would cause stresses and brittle fracture.
Best Regards,
athomas236
RE: Building HRSGs at minus 50C
RE: Building HRSGs at minus 50C
RE: Building HRSGs at minus 50C
You are looking at the steel and welding (brittle fracture) but concrete doesn't like curing (or mixing!) that cold either.
Can you buy more vodka and boil the water with it?