GB 3087-1999 Seamless steel pipes for low and medium pressure boilers GB 3089-1982 Stainless acid-resistant steel extremely thin-walled seamless steel pipe GB/T 3090-2000 Stainless steel small diameter seamless steel pipe GB/T 3091-1993 Galvanized welded steel pipes for low-pressure fluid transportation GB/T 3091-2001 Welded steel pipes for low-pressure fluid transportation GB/T 3092-1993 Welded steel pipes for low-pressure fluid transportation GB/T 3093-2002 High-pressure seamless steel pipe for diesel engines GB/T 3639-2000 Cold drawn or cold rolled precision seamless steel pipe GB 5310-1995 Seamless steel pipes for high-pressure boilers GB/T 5312-1999 Carbon steel and carbon-manganese steel seamless steel pipes for ships GB 6479-2000 Seamless steel pipe for high-pressure fertilizer equipment GB/T 8162-1999 Seamless steel pipes for structural use GB/T 8163-1999 Seamless steel pipes for conveying fluids GB 8713-1988 Precision inner diameter seamless steel pipes for hydraulic and pneumatic cylinders GB 9948-2006 Seamless steel pipe for petroleum cracking GB 13296-2007 Stainless steel seamless steel pipes for boilers and heat exchangers GB/T 14975-2002 Stainless steel seamless steel pipes for structural use GB/T 14976-2002 Stainless steel seamless steel pipes for fluid transportation GB/T 17395-1998 Size, shape, weight and allowable deviation of seamless steel pipes GB/T 17396-1998 Hot-rolled seamless steel pipe for hydraulic props GB 18248-2000 Seamless steel pipes for gas cylinders GB/T 18984-2003 Seamless steel pipes for low temperature pipelines GB/T 20409-2006 Internally threaded seamless steel pipe for high-pressure boilers
GB/T 20409-2006 Internally threaded seamless steel pipe for high-pressure boilers
1. Pipeline installation includes all processes of low-pressure straight pipe installation, excluding the pipe connection process of low-pressure pipe fittings. Pipeline installation is listed separately according to material and welding form, and "10m" is used as the unit of measurement. 2. The installation of low-pressure carbon steel pipes, low-pressure stainless steel pipes, low-pressure alloy steel pipes, low-pressure non-ferrous metal pipes, low-pressure non-metallic pipes, and cast iron pipes for production does not include the installation of pipe fittings. The installation of pipe fittings shall be carried out according to the designed amount and the corresponding sub-item of pipe fitting connection. 3. Low-pressure lined steel pipes include the entire process of installation and removal of straight pipes, pipe fittings, and flanges, with "10m" as the unit of measurement. 4. The engineering quantities of various pipeline installation projects are calculated in "extended meters" based on the design pipeline center length, without deducting the length of valves and various pipe fittings; in the case of bent pipes, the calculation is based on the intersection of the center lines of the two pipes. The quantity of main materials should be calculated according to the corresponding sub-item usage. 5. Calculate the engineering quantities for the installation of the inner and outer pipes of the heating casing respectively, and execute the corresponding projects. 6. The threaded connection items of seamed steel pipes include the installation of heads and core fillers, and shall not be calculated separately.
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