Spiral Submerged Arc Welded Pipe In API 5L Line Pipe Applications

Short Description:

In the oil and gas transportation sector, the use of spiral submerged arc welded pipes is becoming more and more common, especially in the construction of API 5L line pipe systems. SSAW (submerged arc welded) pipe is known for its high strength, durability and flexibility, making it ideal for demanding applications such as the oil and gas industry.

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The API 5L line pipe standard is a specification developed by the American Petroleum Institute (API) for the transportation of natural gas, oil and water. It outlines the manufacturing requirements for welded steel pipes and sets out strict guidelines for the quality, strength and performance of these pipes.

Mechanical Property

steel grade	minimum yield strength Mpa		Tensile strength		Minimum elongation %	Minimum impact energy J
steel grade	Specified thickness mm		Specified thickness mm		Specified thickness mm	at test temperature of
	＜16	＞16≤40	＜3	≥3≤40	≤40	-20℃	0℃	20℃
S235JRH	235	225	360-510	360-510	24	-	-	27
S275J0H	275	265	430-580	410-560	20	-	27	-
S275J2H	275	265	430-580	410-560	20	27	-	-
S355J0H	365	345	510-680	470-630	20	-	27	-
S355J2H						27	-	-
S355K2H						40	-	-

SSAW pipe is manufactured using a submerged arc welding process that involves forming a coil of steel into a round shape and then using a welding arc to fuse the edges of the coil together.

One of the main advantages of using spiral submerged arc welded pipe in API 5L line pipe applications is their ability to withstand high levels of internal and external pressure. This is especially important in the oil and gas industry, where pipelines are exposed to extreme conditions and heavy loads. The strong construction of SSAW pipes makes it ideal for pipelines operating at high pressures and temperatures, providing a reliable and long-lasting solution for the transportation of valuable resources.

In addition, the flexibility of spiral submerged arc welded pipe makes it easy to install and maintain, making it a cost-effective choice for pipeline construction projects. Their ability to flex and conform to the natural contours of the terrain eliminates the need for expensive and time-consuming custom fitting manufacturing and reduces the risk of leaks and failure. Additionally, the smooth inner surface of SSAW pipes minimizes friction and turbulence, resulting in more efficient flow and lower energy consumption.

Chemical Composition

Steel grade		Type of de-oxidation a	% by mass, maximum
Steel name	Steel number	C	C	Si	Mn	P	S	Nb
S235JRH	1.0039	FF	0,17	—	1,40	0,040	0,040	0.009
S275J0H	1.0149	FF	0,20	—	1,50	0,035	0,035	0,009
S275J2H	1.0138	FF	0,20	—	1,50	0,030	0,030	—
S355J0H	1.0547	FF	0,22	0,55	1,60	0,035	0,035	0,009
S355J2H	1.0576	FF	0,22	0,55	1,60	0,030	0,030	—
S355K2H	1.0512	FF	0,22	0,55	1,60	0,030	0,030	—
a. The deoxidation method is designated as follows: FF: Fully killed steel containing nitrogen binding elements in amounts sufficient to bind available nitrogen (e.g. min. 0,020 % total Al or 0,015 % soluble Al). b. The maximum value for nitrogen does not apply if the chemical composition shows a minimum total Al content of 0,020 % with a minimum Al/N ratio of 2:1, or if sufficient other N-binding elements are present. The N-binding elements shall be recorded in the Inspection Document.

In summary, the use of spiral submerged arc welded pipe in API 5L line pipe applications offers a series of advantages that make it an attractive option for the oil and gas industry. Their strength, durability and flexibility make them ideal for use in demanding environments, while their ease of installation and low maintenance requirements provide a cost-effective solution for pipeline construction projects. As the demand for reliable, efficient transportation of oil, natural gas and water continues to grow, the importance of spiral submerged arc welded pipe in the API 5L line pipe standard cannot be overstated. With its proven performance and versatility, spiral submerged arc pipe is set to continue to be a critical component of the infrastructure that drives the global economy.