Steel piping filter welding, ASME B31.3 pressure piping factory prefabrication, piping flange pipe fittings factory integral welding

This batch of filters is a complete set of ASME B31.3 piping equipment, manufactured by our factory in accordance with the customer’s design drawings. Nominal size is DN600, total length is 2974mm, and the piping transmission medium is oil, gas and water containing H2S and CO2. Design pressure is 3.4MPa, hydraulic test pressure is 5.1MPa. The hydraulic test is witnessed by SGS on site.

Main Pipe for this filtering piping is A106 Gr.B seamless steel pipes from TPCO, specification is 24” Sch40. Material of cap is ASTM A516 Gr.70N from Wuyang Iron & Steel. Material of long neck flange, welding neck flange and blind flange is ASTM A105, pressure is Class 300. Studbolt material is ASTM A193 B7 and hex heavy nut material is ASTM A194 2H. Flanges and caps are produced by our factory. The welding adopts argon arc welding for bottoming and semi-automatic CO2 protection welding. Welding seams are performed 100% radiagraphic testings and provide the documents of WPS, PQR, WPQ. Before manufacturing, our company provide 3D and plan drawings for customer’s confirmation. After welding, perform post-weld annealing heat treatment to eliminate the stress. Shot blasting to SA2.5 roughness before coating. Inside wall is coated with epoxy glass flake painting and outside surface is coated with Jotun epoxy primer and intermediate painting.