-Are pipes at 15℃, 0.4MPa, DN250 and DN40 considered pressure pipelines? Is it necessary to submit for inspection?
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As the title suggests, please discuss this.
As a supplementary note, the material is frozen saline
According to the definition of pressure pipelines: any pipeline with a pressure of 0.1 MPa or higher is considered a pressure pipeline.
Experts who have dealt with the Special Inspection Institute for a long time say it can be disregarded, but the design institutes classify them all as pressure pipelines, and now things are unclear
The definition and classification of pressure pipelines are clearly stated there; believe it or not, they are indeed there, and enterprises and individuals across the country abide by them. Of course, you can also create your own standards and have **others recognize those standards. It is your personal right, as well as your boss’s right.
This post was last edited by hcer on 2019-9-28 17:22. DN250 is, DN40 is not
Since the task has been entrusted to a design institute, one must trust that institute; setting higher standards and more stringent requirements is always the right approach, as it brings only benefits to the company with no drawbacks. The drawings from the design institute show it as a pressure pipeline – why don’t you follow the design requirements? ? If one has objections and believes oneself to be absolutely correct, why not go straight to the design office and firmly refute those opinions so that the engineers there can correct their mistakes immediately? ? ? It seems that the design institute is still more authoritative! Why bring up such a trivial question for discussion? Only private enterprises deduct points on these standards; they hope for even lower standards, or ideally no standards at all, to save more money.
Equipment and pipelines that use circulating water (chilled brine) are all considered pressure equipment; they must be classified as pressure vessels and undergo regular inspections. I support the Design Institute. If one insists it isn’t, then it’s just a waste of time. Believe it or not.