Atmospheric pressure pipeline grade issue
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For normal-pressure pipelines that are non-toxic and harmless, used for transporting gases such as air at a pressure of 0.05 MPa, is it okay to choose a pipeline grade of 0.6 MPa? But what letter is used to represent 0.6 MPa? L is 1.0 MPa; isn’t there any letter after L in the standards? This post was last edited by lcpinging on 2009-2-20 10:26.]
There’s no need to be so rigid; it can be designated as A, B, C, etc. – just make it clear on the homepage image. **There are currently no strict regulations regarding the grading scale; each organization can establish its own rules, so flexibility is required. Generally, valves with a pressure rating of less than 1.0 MPa are made of cast iron. In the chemical industry, apart from water and air, cast iron valves are not typically used as they tend to leak; therefore, it is customary for the pressure rating to start at 1.0 MPa.
The lowest voltage rating is 1.0 MPa, followed by 1.6 MPa, 2.5 MPa, …; therefore, for 0.6 MPa, the rating of 1.0 MPa should be used
*The standard pressure rating starts at 1.0 MPa