Classification of Spiral Welded Steel Pipes

Release date:

2019-04-17

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Steel Pipe Knowledge

Pressure‑bearing fluid conveyance: spiral‑seam submerged‑arc welded steel pipe, conforming to SY 5036‑2000, is primarily used for oil and natural gas pipelines. Spiral‑seam high‑frequency welded steel pipe, specified in SY 5038‑2000, is manufactured by high‑frequency lap welding and likewise employed for pressure‑bearing fluid transport. These pipes exhibit strong pressure resistance, good ductility, and are easy to weld and form. For general low‑pressure fluid conveyance, spiral‑seam submerged‑arc welded steel pipe, designated as SY 5037‑2000, is produced via double‑sided automatic submerged‑arc welding or single‑side welding. It is intended for transporting water, coal gas, air, steam, and other common low‑pressure fluids. Common standards for spiral‑welded steel pipes generally include: SY/T 5037‑2008 (a ministry‑level standard, also known as spiral‑seam submerged‑arc welded steel pipe for ordinary fluid conveyance); GB/T 9711.1‑2008 (a national standard, referred to as the technical delivery requirements for steel pipes used in the petroleum and natural gas industries—Part I: Grade A steel pipe; stricter requirements apply to GB/T 9711.2 Grade B steel pipe); API 5L (the American Petroleum Institute standard, also called line pipe, with two grades—PSL1 and PSL2); and SY/T 5040‑2008 (spiral‑welded steel pipe for pile applications). SY/T 5037‑2008, established by the Ministry of Petroleum, is commonly referred to as a “ministry standard.” GB/T 9711.1‑2008 specifies national spiral‑welded pipes for the petroleum and natural gas industries, classified as Grade A. General low‑pressure fluid‑conveying spiral‑seam high‑frequency welded steel pipe (SY 5039‑2000) is fabricated from hot‑rolled steel strip coils serving as tube blanks, formed into spirals at ambient temperature, and welded using high‑frequency lap welding. Spiral‑welded steel pipe for pile applications (SY 5040‑2000) is made from hot‑rolled steel strip coils as tube blanks, shaped into spirals at room temperature, and manufactured through either double‑sided submerged‑arc welding or high‑frequency welding. It is utilized as foundation piles in civil engineering structures, wharves, bridges, and similar applications.

Pressure‑fluid transportation, using spiral‑seam submerged‑arc welded steel pipe in accordance with SY 5036‑2000, is primarily employed for pipelines conveying petroleum and natural gas.

Spiral‑seam high‑frequency welded steel pipe for pressurized fluid conveyance, conforming to SY 5038‑2000, is manufactured by the high‑frequency lap‑welding process and is intended for the transport of pressurized fluids. This type of pipe exhibits strong pressure resistance, excellent ductility, and is easy to weld and form during fabrication.

For general low-pressure fluid conveyance, spiral‑seam submerged‑arc welded steel pipes conforming to SY 5037‑2000 are used. These pipes, manufactured by either double‑sided automatic submerged‑arc welding or single‑sided welding, are intended for the transport of water, coal gas, air, steam, and other common low‑pressure fluids.

Common standards for spiral welded steel pipes generally include: SY/T 5037-2008 (a ministry standard, also known as spiral submerged‑arc welded steel pipe for general fluid transportation); GB/T 9711.1-2008 (a national standard, also referred to as Technical Delivery Conditions for Steel Pipes Used in the Petroleum and Natural Gas Industries—Part 1: Grade A steel pipe; stricter requirements are specified in GB/T 9711.2, Grade B steel pipe); API 5L (published by the American Petroleum Institute, also known as line pipe, which is further divided into two grades: PSL1 and PSL2); and SY/T 5040-2008 (spiral welded steel pipe for pile applications).

SY/T 5037-2008 is a standard established by the Ministry of Petroleum; such standards are commonly referred to as “Ministry Standards.”

GB/T 9711.1-2008 National Standard for Spiral Welded Steel Pipes, Steel Pipes for Transportation in the Petroleum and Natural Gas Industries, Grade A

General-purpose spiral‑seam high‑frequency welded steel pipe for low‑pressure fluid conveyance (SY5039‑2000) is manufactured by using hot‑rolled steel strip coils as the tube blank, forming it into a spiral shape at room temperature, and welding it with high‑frequency lap‑joint technology.

Spiral-welded steel pipe for piles (SY5040-2000) is manufactured from hot‑rolled steel strip coils as the tube blank, formed into a spiral shape at room temperature, and produced by either double‑sided submerged arc welding or high‑frequency welding. It is used as pile steel pipe in civil and structural engineering applications, such as foundations for docks, bridges, and other infrastructure.