ASTM A53 spiral steel pipe the difference between fixed length and indefinite length

　　Steel pipe manufacturers introduce what are the differences between fixed length and variable length ASTM A53 spiral steel pipes.

　　The length of steel pipes for pipelines, but for the convenience of users, when the steel pipes are sold at any time, the spiral steel pipes are produced with variable length pipes within the standards, but when the actual order is made, the standard length steel pipes are produced. For pipes Arc welded carbon steel pipes are generally 6000 mm, carbon steel pipes for pressure pipes, carbon steel pipes for pipelines, waterway steel pipes, etc. are generally 5500 mm. The length of the heat transfer steel pipe is determined based on the usage location and under the specific spiral steel pipe design, so it is suitable for fixed length.

　　The length of structural steel pipes is also often fixed length. Steel pipes used in mechanical structures require stricter usage deviations in terms of usage. The length of steel pipe columns and steel pipe scaffolding made of general structural steel pipes is specified by the manufacturer. The steel pipes used as pipe materials are produced based on the length which is an integral multiple of the design length. The allowable deviation of the length does not specify the positive deviation, only the control On negative and zero.

　　As mentioned above, most ASTM A53 spiral steel pipes are of fixed length, but steel pipes used in oil wells are not of fixed length. Although it is an indefinite length, it is not completely unlimited. Its length range is divided into three levels. Within each level of the length range, there is a minimum length and the difference between the minimum length and the length.