Are there any materials that can compare to HG20559?
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This post was last edited by Desert Fish on 2017-5-18 at 18:18. After reading the \"Basic Unit Patterns for Piping and Instrumentation Diagrams\" (HG20559-93), I found it to be good and practical, but it’s a bit outdated. Are there any materials that can compare to HG20559? Please give some recommendations.
It seems this specification hasn’t been updated; the old one is still fine
The more you get older, the more you use it; many new standards only tell you the results, while providing little information on how they were obtained
There is also a petrochemical standard. It seems to be from 2014.