SSAW Pipe

　　Hydrostatic pressure test is an indispensable part in the manufacturing process of steel pipe. Its function is to detect the anti-leakage function of steel pipe under the standard test pressure and steady voltage. It is the same as the flaw detection process of ray and ultrasonic, and is an important means to check the overall quality of steel pipes. So what are the regulations for the hydrostatic test of the casing pipe? The following is simple for everyone: 　　1. The hydrostatic test pressure value of the coupling and threaded pipe is the lowest value of the hydrostatic test pressure of the flat end pipe, the maximum hydrostatic pressure test pressure of the coupling, and the internal pressure leakage resistance, but the maximum pressure is 69 MPa, and 　　the calculation pressure is The value is usually rounded to the nearest 0.5 MPa. 　　2. According to the API requirements, the hydrostatic pressure test pressure measuring device should be calibrated within 4 months before each ...

　　Steel Pipe cleaning and maintenance need to follow certain methods to clean up. The main use of tools such as wire brush the surface of polished steel. Steel pipe cleaning and removal of loose or tilt can preheat the oxidation, rust, welding slag. Hand tools rust can reach Sa2 grade power tools rust up Sa3 level. If attached to a solid steel surface oxide scale, the result is not ideal tools rust, corrosion construction requirements not reach the depth of the anchor pattern. 　　Acid using solvent, emulsion cleaning fluid low pressure welded steel pipe surface, in order to achieve the removal of oil, grease, dust, lubricants and similar organisms, but it can not remove the steel surface rust, oxide, welding medicines, and therefore the production of anti-corrosion only as an adjunct. Different forms of ways and means to clear rust will cause some of the important impact of seamless, affecting a large number of performance and factors, in strict accordance with traditional Chinese me...

　　API early in 1926 released by the American Petroleum Institute (API) API-5L standard, initially including three steel grade A25, A, B, and later released several times. Prior to 2000, the worldwide use X70, about 40%, X65, X60 are in the 30%, a considerable number of small-caliber product oil pipeline selection of X52 steel grade, mostly for resistance welding straight pipe ( ERW steel pipe ). 　　China is currently used in the Petroleum Pipeline tube spiral welded pipe (SSAW), LSAW pipe (LSAW), electric resistance welded pipe (ERW). Diameter less than 152mm selection of seamless steel tubes. Of the late 1960s to the 1970s, spiral pipe plant rapid development of crude oil pipelines almost all spiral welded steel pipe, "West-East pipeline region selection spiral welded steel pipe. The spiral welded steel pipe of the disadvantage is the internal stress is large, the dimensional accuracy is poor, the probability of generation of defects. According to expert analysis, should adopt t...

　　Inner coating can greatly improve pipeline capacity. It can prevent corrosion and reduce the role of the pumping costs. Improving gas flow within the coating technology development update has become the main methods of transport in major companies to increase the amount. It can significantly reduce the friction between the gas and the tube wall which is the basic function of the inner coating technology. The friction caused by the tube at the factory of its inner surface is rough, the use of the inner pipe wall coating becomes smooth, the friction between the gas and the wall becomes small. It will accelerate the gas flow rate, and the cost of pumping the respective compression lower. 　　The coating into a file (dry film thickness of 80 ~130 um) coated on the inner wall of the tube. Epoxy resins are currently the most widely used in the coating material, a lot of in-service pipeline are in use. The inner coating should have a certain adhesion, porosity, elasticity, chemical resistan...

　　Welding neck flange is a type of pipe fittings which has “round neck” in the center. The “round neck” is already bevelled which is directly for welding with the pipe ends. The outside diameter of the “round neck” is the same as the connected pipe outside diameter. In general, the outside diameter for the “round neck” hole is ranges from 50mm to 2130mm. Around the “round neck” there are 4 to 48 bore hole which is used with bolts to connect two flanges together. The outside diameter for the bore hold ranges from 11mm to 30mm. The outside diameter for welding neck flange ranges from 75mm to 2190mm, and the thickness is from 12mm to 58mm. There are five types of sealing face for welding neck flange which are RF, MFM, TG, FF, RJ. 　　Welding neck flange has good sealing and distortion properties with a relatively cheap price. It is widely applied for pressure or temperature fluctuation pipeline under the nominal pressure less than PN 2.5 MPa, and also used for transporting expansive, fla...

　　Specified in ISO 4200, EN10220 or DIN2448, the specified size of steel pipe refers to the length, outside diameter, inside diameter and wall thickness of the steel pipe . The range size of steel is an effective measure to save materials. Today we will discuss the length of steel pipe. Delivery length is also known as customer required length or contract length. Steel pipe manufacturers or suppliers can supply according to standard length. The legal units of measurement for the length of steel pipe are “m”, ” cm” and “mm”. 　　Random length 　　Indefinite length refers to the length of steel pipe in the standard range and does not require fixed length, also known as the usual length. The steel pipes delivered by indefinite scale shall be delivered within the specified length range. For example, the standard of structural pipes stipulates: the length of hot-rolled (extruded and expanded) steel pipes is 3000mm ~ 12000mm; Cold drawn (rolled) steel tubes with a length of 2000mm ~ 10500mm ...

　　Hydrostatic pressure test is an indispensable part in the manufacturing process of steel pipe. Its function is to detect the anti-leakage function of steel pipe under the standard test pressure and steady voltage. It is the same as the flaw detection process of ray and ultrasonic, and is an important means to check the overall quality of steel pipes. So what are the regulations for the hydrostatic test of the oil casing? The following is simple for everyone: 　　1. The hydrostatic test pressure value of the coupling and threaded pipe is the lowest value of the hydrostatic test pressure of the flat end pipe, the maximum hydrostatic pressure test pressure of the coupling, and the internal pressure leakage resistance, but the maximum pressure is 69 MPa, and the calculation pressure is the value is usually rounded to the nearest 0.5 MPa. 　　2. According to the API requirements, the hydrostatic pressure test pressure measuring device should be calibrated within 4 months before each appli...