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Operating a flowline made of duplex steel (A790 S31803) at a lower temp. than it was designed for.
We have taken the dicision to replace the downstream piping with Duplex material according to the new Material Data Sheet (charpy at -46 deg C). As SJones mentioned, there is not an easy critical assessment that we can do for duplex material without destructive intervention. Thanks to all...- kjdush
- Post #12
- Forum: Pipelines, Piping and Fluid Mechanics engineering
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Operating a flowline made of duplex steel (A790 S31803) at a lower temp. than it was designed for.
No, -38 deg C is the metal temp during the normal operating condition.- kjdush
- Post #8
- Forum: Pipelines, Piping and Fluid Mechanics engineering
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Operating a flowline made of duplex steel (A790 S31803) at a lower temp. than it was designed for.
You are absolutely correct LittleInch. Practically we can operate at -38 deg C. But the problem is that we can not approve it with documentation without proper evaluation. As you said the low temperature is a real issue. Regarding the thermal stress analysis:-The stress calculation is updated...- kjdush
- Post #6
- Forum: Pipelines, Piping and Fluid Mechanics engineering
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Operating a flowline made of duplex steel (A790 S31803) at a lower temp. than it was designed for.
Thankas to both BigInch and Sjones for the answers:-) We thought of removing a small pipe spool and test it for Charpy at lower temperature. But, because of the lack existing documentation tracing of the Heat number for the different pipe spools, forgings and castings is a big task. We are...- kjdush
- Post #4
- Forum: Pipelines, Piping and Fluid Mechanics engineering
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Operating a flowline made of duplex steel (A790 S31803) at a lower temp. than it was designed for.
Hi! This is regarding operating a flowline made of duplex material(A790 S31803) at a lower temperature than it was designed for. This flowline was designed for a lowest temperature of -20C around 25 years ago for Oil production. Now it is producing only Gas. After the chock valve, because of...- kjdush
- Thread
- Replies: 12
- Forum: Pipelines, Piping and Fluid Mechanics engineering
