Should the nominal pressure of chlorine pressure pipelines be 5.0?
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I would like to ask the experts: According to SH3059, \"the nominal pressure of SHA pipelines should not be lower than 5.0 MPa.\" Chlorine pressure pipelines fall under the category of SHA; therefore, when submitting materials, should these pipelines, valves, and flanges all be specified at 5.0 MPa?
Yes, according to SH3059, chlorine pressure pipelines, as SHA pipelines, must have a nominal pressure of not less than 5.0 MPa. Therefore, when supplying materials for chlorine pipelines, valves, and flanges, it should be ensured that their nominal pressure meets or exceeds 5.0 MPa. This ensures the security and reliability of the system. .
If I don’t design in accordance with petrochemical standards, do I then not need to follow standard 5.0? For example, if I design based on GB50316 and GB20801, can I use standards of 2.5 or 2.0 instead? Is such a specification allowed?
This clause is no longer included in the 2012 version of the standards.
Is there then a specification for the minimum nominal pressure of highly toxic materials?
Yes, there are. In GB50316, flanges for Class A1 fluids shall be at least PN20.
“\"HGT20646-1999 Specifications for the Design of Pipeline Materials in Chemical Plants\", P120: For highly toxic and toxic fluids, flat-weld (plate-type) flanges should not be used. When selecting the nominal pressure of such flanges, a margin of 25% or more should be reserved, and it should not be lower than 2.0 MPa. When soft gaskets are used, flanges with male-female faces or tenon-socket faces should be chosen.