The air cooler in HYDROCRACKER unit (oil refining plant)have the below
specifications,Please guide me about the welding procedure ,filler
metal and any requirements in conform to service.
design pressure:55.3 bar/f.v
design temperature:171 celsius
fluid circulated: H2+HCBN TRACES
X-ray examination:spot
PWHT:yes (Max. weld hardness;200 brinnel)
Materials:SA-516Gr.60 , SA-105 , SA-234WPB
Headers Thk.:30 mm.
This air cooler is in first steps of construction and only the main
drawing is available.the old equipment shall be replaced by the new.
Any supplementary date or detail is out of availability.
in API 661 some requirements like as low hydrogen content , ... is
mentioned, but it is possible the medium/service make the more
restriction that is not mentioned or detailed in this standard,
Is there any requirement for filler metal or welding process in
relation to medium (H2+HCBN TRACES) or service (hydrocracking)?
With best regards.
GRH
28.02.2011
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