Sink pipe is one of the essential equipments in oil and gas gathering and transportation. It is directly connected with the pipeline, the working pressure from a few tenths of MPa to more than and 10 MPa, the diameter from a few hundred to one thousand mm above, the length from a few meters to more than and 10 meters have, it has the characteristics of pipeline and pressure vessel. National standard "code for design of transmission pipeline engineering (hereinafter referred to as the" GB50251-2003 "design specification") will regard it as the pipeline accessories, and the combination of conditions working pressure, geometric dimensions and working medium with pressure vessels safety and technical regulations issued by the State Bureau of quality and technical supervision "(hereinafter referred to as the" content regulation "). Jurisdiction. Therefore, the manifold in the design, manufacture, use and maintenance, whether it is treated as a pipe attachment or by the pressure vessel, in the exchange of gas mains on the mouth is essential to the production process.

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