SSAW Pipe

　　Before the pressure pipeline nondestructive testing, visual inspection of welds shall comply with the requirements. Pressure pipe weld appearance and surface quality of welded joints general requirements are as follows: welding should look good shape, width of each side groove edge 2mm overshadowed appropriate. Fillet weld leg height should meet the design requirements, the shape should be smooth transition. 　　(1) Do not allow cracks, lack of fusion, pores, slag, spatter exist. 　　(2) The design temperature is below -29 degrees pipes, stainless steel and hardened alloy steel pipes tend to be larger weld surface, without undercut. Other material pipe weld undercut depth should be greater than 0.5mm, continuous undercut length should not exceed 100mm, and both sides of the weld undercut always grow up to 10 percent of the entire length of the weld. 　　(3) Not be lower than the surface of the weld surface of the pipe. Weld reinforcement and no more than 3mm, (the maximum width of we...

    The components of the pressure pipe are generally standard parts like the astm a53 pipe or astm a106 pipe, so the design of the pressure pipe components is mainly the selection of standard parts, pipeline pressure level is to determine the level of its standard parts to determine.     The pipeline's pressure rating consists of two parts:     Nominal pressure standard pipe nominal pressure rating;     Wall thickness rating of standard pipe in terms of wall thickness.     Pipeline pressure rating: Pipeline usually by standard pipe nominal pressure level and wall thickness level together to determine the characteristics of the pipe can be reflected pressure characteristics of the pipe called the pressure rating. Customary to simplify the description, often the nominal pressure pipe fittings in the pipeline called the pressure level.     The determination of the pressure level is the basis of the design of the pressur...