To which qualification category do the design documents for fittings such as tees and elbows in pressure pipelines belong?
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The safety technical specifications for special equipment state that: “For the manufacture of pipeline components, there must be design (technical) documents and manufacturing process documents,......” Should the design (technical) documents in question be prepared by entities with qualifications for pressure pipeline design, or by those with qualifications for pressure pipeline manufacturing? And who is responsible for preparing the stress calculation reports for strengthening tees created on-site? Should this be done by the pressure pipeline design unit or by the entity carrying out the on-site fabrication?
In cases involving pressure pipelines, all documents are prepared by units with design qualifications; the construction party merely builds according to the plans and arranges for inspections.
My main question is: does the qualification for pressure pipeline design include the qualification for designing pipeline components? The regulations on safety supervision of pressure pipelines specify that pipeline components include pipes, fittings, flanges, valves, safety protection devices, expansion joints, and many other elements. Is a pressure pipeline design qualification, or a pressure vessel design qualification, required for the design of these components? For things like tees, valves, etc., is a pressure vessel design qualification required?
Pressure pipeline components do not have design qualifications. . . . The statement
The reinforcement calculation document for fabricating tees through on-site drilling is prepared by the pressure pipeline design agency
The safety technical specifications for special equipment stipulate that: \"For the manufacture of pipeline components, there must be design (technical) documents and manufacturing process documents,...\" This is divided into \"design qualifications for pressure pipeline components\", which are available in ordinary design institutes； Manufacturers with the qualification for manufacturing pressure pipeline components exist.
Manufacturers generally produce products according to design requirements. Such as drawings, product standards, etc. If it is a standard part, then the products manufactured by the manufacturer must meet the requirements of the standards. For pipeline design, standard components are generally selected, and only strength calculations are required.