Pipe material selection for coiled tube heat exchangers
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In accordance with A1.2.3 in Annex A of Page 100 of the Regulatory Specifications, regarding the determination of the toxicity hazard level and explosion risk level of media, it shall be determined in line with HG 20660-2000. However, HG 20660-2000 has now been updated to HG/T 20660-2017. May I ask whether, when manufacturing the equipment, the piping materials should be selected in accordance with the 2000 version of the standards, or should the piping be purchased based on the 2017 version of the standards? The medium is methanol, containing a small amount of hydrogen sulfide. It is up to the design unit to determine the medium category classification in accordance with A1.3.4, which pertains to pressure vessels with extremely low medium content.
As specified in Notes 1–7 on page p4 of the Compliance Regulations, if the referenced standard includes a publication year, the version corresponding to that year shall be used; newer versions are not applicable.
As specified in Notes 1–7 on page p4 of the Compliance Regulations, if the referenced standard includes a publication year, the version corresponding to that year shall be used; newer versions are not applicable.
Comply with HG 20660-2000
For those with a year designation, proceed according to the version of the referenced standard corresponding to that year.
In accordance with the 2000 version, **the bureau has provided a response
For those with a year designation, proceed according to the version of the referenced standard corresponding to that year.