I mean, circulating water pipes are not pressure pipes, but what are the requirements for welds in such cases?

Although they are not pressure pipelines, everyone is aware of the importance of circulation water pipelines. If there are problems with these pipelines during the production process (especially in distillation), it becomes necessary to shut down the operation. Therefore, strict control is required over the welding quality of these pipelines; some companies even require internal welding for pipelines with a diameter of DN1000 or more, and flaw detection inspections are carried out during acceptance.

The design specifications are generally stated as follows: The pipelines for the materials and media used in the device must be constructed and inspected in accordance with the \"Code for Construction and Acceptance of Pipelines for Highly Toxic and Flammable Media in Petrochemical Industries\" (SH3501-2002)； Pipes for utility services such as low-pressure steam, chilled water, circulating water, industrial water, nitrogen, and compressed air are constructed and inspected in accordance with the \"Code for Construction and Acceptance of Industrial Metal Piping Projects\" (GB50235-97).

Yes, handle it in accordance with the specifications for the construction and acceptance of industrial metal pipelines! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !

Treated in accordance with the specifications for the construction and acceptance of industrial metal pipelines; weld coefficient of 0.6

Although the circulating water pipeline is not a pressure pipeline, in accordance with clause 8.1.1 of the \"GB 50184-2011 Code for Acceptance of Construction Quality of Industrial Metal Piping Projects\", when the design pressure is greater than 1 MPa, the inspection grade for welds is III; (3) For pipelines carrying non-flammable and non-toxic fluids at a design pressure greater than 1 MPa but less than 4 MPa and a design temperature below 400°C, radiographic testing at a rate of 5% is required； The requirements for radiographic testing shall be implemented in accordance with the provisions of 8.2.1 and 8.2.2. Regardless of the design pressure of the circulating water pipeline, a pressure test is conducted after it has been installed and passed non-destructive testing. The pressure test shall be carried out in accordance with 8.5.2: (1) Clean water shall be used for the hydraulic test. ) and (3 The test pressure shall comply with the following requirements: 1) For above-ground steel pipes and non-ferrous metal pipes subjected to internal pressure, the test pressure shall be 1.5 times the design pressure. The test pressure for buried steel pipes shall be 1.5 times the design pressure, and shall not be less than 0.4 MPa. ) shall be implemented in accordance with the provisions. For reference