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How Much Do You Know API Standards in Pipelines ?

A pipe is a device for conveying a fluid, such as a gas, a liquid, or a solid particle with a pipe, a pipe joint, and a valve. Generally, the fluid through the blower, compressors, pumps and boilers, such as pressurized, from the pipeline high-pressure to the low, can also use the pressure of the fluid itself or gravity transport. Pipelines are widely used in water supply, drainage, heating, gas supply, long-distance transportation of oil and gas, agricultural irrigation, hydraulic engineering and various industrial installations.


As early as 1926, the American Petroleum Institute (API) issued api-5l standards, initially consisting only of A25, A, b three steel grades, and later issued several times, see table 4. Table 4 level of pipeline steel released by API


Note: 1972 API release U80, U100 Standard, later changed to X80, X100.


2000 ago, the world used X70, around the 40%,x65, X60 are in 30%, small-caliber product pipeline selection of a considerable number of X52 steel grade, and many for resistance welding straight pipe (ERW pipe).


China's metallurgical industry in more than 10 years for the development of pipeline steel has paid a great deal of hard work, is currently trying to tackle X70 wide board, Shanghai Baoshan Iron and Steel Company, Wuhan Iron and Steel company, such as X70, X80 chemical composition, mechanical properties are listed in table 5~ table 9 respectively. Table 5 WISCO X80 Plate Performance Table 6 X70 gradesteel Pipe mechanical Properties Table 7 X70 grade steel pipe bending performance Test Results table 8 X70 grade steel tube summer ratio impact toughness Table9 high strength conveyor tube summer ratio impact toughness


The pipe types commonly used in China's pipeline are spiral submerged arc welded pipe (SSAW), straight seam submerged arc welded pipe (LSAW), Resistance welded pipe (ERW). When the diameter is less than 152mm, the seamless steel tube is selected.


China from the late 1960s to 70, the rapid development of spiral welded pipe factory, almost all of the crude oil pipelines using spiral welded steel pipe, ' west-East gas pipeline ' in a type of region also selected spiral welded steel pipe. The disadvantage of spiral welded steel pipe is that the internal stress is big, the dimension precision is poor, and the probability of producing defects is high. According to expert analysis, we should adopt ' two legs ' approach, one is to the existing spiral welded pipe plant active technical renovation, or a great future, the second is to vigorously develop China's direct seam submerged arc welding control industry.


ERW Steel pipe has been widely used at home and abroad because of its characteristics of smooth appearance, high dimensional precision and low price.


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