Questions regarding pipeline-grade GC and SH
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Previously, GC grade materials were used; now a design based on petrochemical standards is required – does this mean that materials of types SHA and SHB as specified in SH3501 need to be used instead? Another issue is that SH3501-2011 only specifies requirements for SHA and SHB, which apply to toxic and flammable substances; so how should high-pressure steam be classified? Thank you all!
Piping classification is specified in the \"Code for Selection of Materials for Petrochemical Piping Design\" SH/T 3059-2012
Found it, thanks. I have another question: GC classification is required only for DN50 and above. Are there any specifications regarding pipe diameter in the petrochemical industry?
Check the date of your license; if it needs to be renewed after June 1, 2019, it should be designed in accordance with the requirements of the new license. If the license was issued earlier and has not yet expired, it remains valid.
It means that the license only includes GC, so it can only be issued according to GC? Are there two types of this license: national standard and petrochemical? Thank you
GC is the classification for pressure pipelines, while SH is the inspection level for pipelines. The two definitions are different. . .
What was said upstairs is correct; GC is used for classifying industrial pressure pipelines, while for steam, classification is based on pressure and temperature – GC1, GC2, and GC3 are all possible options； SHA SHB is used to inspect installations and welded joints; for example, if there are 100 welds, 5% means that 5 welds need to be inspected. There is also the choice of inspection methods (ultrasonic testing, radiographic testing, etc.). There is no corresponding relationship between GC and SH, with national standards being more stringent than industry standards ； For steam, refer to GB50517
C is used for classifying industrial pressure pipelines; for steam, classification is based on pressure and temperature, with GC1, GC2, and GC3 all being possible options； SHA SHB is used to inspect installations and welded joints; for example, if there are 100 welds, 5% means that 5 welds need to be inspected. It also involves the selection of inspection methods (ultrasonic testing, radiographic testing, etc.)
GB 50517 can be referred to