Low temperature reached by tubing material during blowdown
Low temperature reached by tubing material during blowdown
(OP)
I've to design an Emergency Depressurization System (blowdown valve + orifice + tubing) for a methane tank (80 bar a. at 35°C). A study seems to show that very low temperatures can be reached by the tubing steel (from -40°C to -100°C).
I want to use some low temperature resisting materials but, because they are more expensive, I need to estimate the length wich will have to be made in this low temperature steel.
Is there anybody having an idea or some informations ?
I want to use some low temperature resisting materials but, because they are more expensive, I need to estimate the length wich will have to be made in this low temperature steel.
Is there anybody having an idea or some informations ?





RE: Low temperature reached by tubing material during blowdown
BTW, if two-inch in Class 600 or higher consider a choke instead of an orifice to take the blowdown pressure drop.
John