The length of LSAW Steel Pipes is usually 3-14 meters and can be supplied in fixed or irregular sizes. The specific length requirements for different applications are as follows:

Oil and gas transportation:

Long distance mainline pipelines: In order to reduce welding workload, improve construction efficiency, and overall pipeline quality, longer steel pipes are often used, generally ranging in length from 12-14 meters. For example, in large-scale long-distance oil and gas transmission projects such as the West East Gas Pipeline, LSAW steel pipes of about 12 meters are extensively used.

Branch pipeline: The length requirement is relatively flexible, possibly ranging from 6-12 meters. Due to the relatively complex laying environment and construction conditions of branch pipelines, shorter steel pipes are convenient for transportation and installation to adapt to different terrains and construction requirements.

Offshore oil and gas transmission pipelines: The length requirements for steel pipes are relatively strict, usually using a standard length of about 12 meters. This is to facilitate construction operations on offshore platforms and ships, and also to ensure the stability and sealing of the pipeline.

Water supply and drainage engineering:

Urban water supply network: LSAW steel pipes with a length of 6-12 meters are generally used. In urban areas, considering the convenience of transportation and the need to cross streets and buildings during construction, 6-9-meter steel pipes are commonly used; In the construction of water supply pipelines in some suburban or open areas, 12 meter long steel pipes are also used to reduce the number of interfaces and lower the risk of water leakage.

Internal pipelines of sewage treatment plants: typically ranging in length from 6 to 9 meters. The pipeline layout in the sewage treatment plant is relatively complex, and it is necessary to choose the appropriate length of steel pipes according to different treatment processes and the layout of structures. Shorter lengths are more convenient for installation and adjustment in the plant area.

Building Structure:

Building support structure: Depending on the design height and structural form of the building, LSAW steel pipes with a length of 3-12 meters may be used. For example, in some multi story buildings, steel pipes used for structures such as columns and beams may be 6-12 meters long; In some large-span steel structure buildings, longer steel pipes may be used to reduce the number of nodes and improve the stability of the structure.

Building curtain wall support: Generally, steel pipes with a length of 3-6 meters are used to adapt to the size and installation requirements of the curtain wall, facilitating installation and adjustment on the exterior facade of the building.

Length accuracy requirements for LSAW steel pipes

1. International standard requirements

API SPEC 5L standard: This is a widely used standard in the oil and gas industry. For pipeline steel pipes, including LSAW steel pipes, the allowable length deviation is usually quite strict. It is generally stipulated that the length of steel pipes should be fixed length or non fixed length. For fixed length, the allowable deviation is+6mm- 0mm, which means that the length of the steel pipe is only allowed to have a positive deviation, and the maximum length cannot exceed the specified length plus 6mm. For example, if the fixed length is 12m, the actual length of the steel pipe can be up to 12.006m and as short as 12m. This requirement is to ensure that during the pipeline laying process, especially for long-distance pipelines, each section of the pipeline can be accurately connected to avoid installation problems caused by accumulated length deviations.

ASTM standards (such as ASTM A53) are widely used in fields such as construction and general fluid transportation. Its requirements for the accuracy of steel pipe length are relatively flexible. For fixed length steel pipes, the allowable deviation is generally around+3/8 inches (about 9.5mm) and -0 inches. There are clear regulations on the length range of indefinite steel pipes, for example, the specified length should be within a certain range, such as 4-7m, 6-10m, etc., and the specific range depends on factors such as the nominal size of the steel pipe.

2. Chinese standard requirements

GB/T 9711 standard: Similar to API SPEC 5L, it has higher requirements for length accuracy in steel pipes used for oil and gas transportation. For fixed length steel pipes, the allowable deviation is also positive deviation, generally+20mm- 0mm. However, in some specific engineering applications or special specification requirements, the deviation range may be further reduced through negotiation between the supply and demand parties. For example, in high-precision pipeline installation projects, it may be required to control the length deviation within+10mm- Within 0mm.

Other industry standards (such as steel pipe standards for building structures): When using LSAW steel pipes in the construction industry, the length accuracy requirements are slightly lower than those in the oil and gas industry. For fixed length steel pipes used in building structures, the allowable length deviation may be+10mm- Around 0mm, the length range of the indefinite steel pipe will also be determined according to the actual application situation. For example, the indefinite length of the steel pipe used in the support structure of the building curtain wall may be specified between 3-6m, and the length deviation of each steel pipe is within a certain range to meet the requirements of on-site installation and splicing.