Welding requirements for process piping
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Our company’s equipment and pipelines will soon be put into use. I would like to ask if anyone has any requirements regarding the welds during piping work. For example, should we try to save on pipeline costs? And in cases where the medium used is hazardous, is it necessary to use TIG welding for the root passes? The nominal pressure is 2 MPa
Refer to the \"Code for Construction and Acceptance of Industrial Metal Piping\", the \"Code for Construction and Acceptance of Welded Works of Field Equipment and Industrial Piping\", and the \"Code for Construction and Acceptance of Piping Projects Involving Toxic and Flammable Media in the Petrochemical Industry\"; they are available on the forum, so you can search for them. There is no slag after TIG welding, and the inside of the pipe is relatively clean; therefore, it is essential to use TIG welding for the root pass.
The material of the pipe also affects welding; aluminum alloy pipes seem to require TIG welding, as do media at low temperatures
All of the pipes in use at our company are carbon steel fluid pipes, with an operating pressure of less than 1.6 MPa and a design pressure of 2.16 MPa. The media handled are saturated steam as well as toxic, harmful, flammable, and explosive substances. Is it necessary to use TIG welding for the root pass?