Enhancing Sewer Infrastructure Using Spiral Submerged Arc Pipes (SSAW)

Short Description:

This part of this European Standard specifies the technical delivery conditions for cold formed welded structural, hollow sections of circular, square or rectangular forms and applies to structural hollow sections formed cold without subsequent heat treatment.

Cangzhou Spiral Steel Pipes Group Co., Ltd supplies hollow section of circular forms steel pipes for structure.

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Introduce:

An efficient sewer system is vital to the growth and development of any city. In the construction and maintenance of sewer lines, selecting the appropriate pipes and installation methods is crucial. Spiral submerged arc pipes (SSAW) have become a highly reliable and cost-effective solution for sewer infrastructure. The purpose of this blog is to shed light on the benefits and applications of spiral submerged arc welded pipe in enhancing sewer systems.

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	-	-

Overview of spiral submerged arc welded pipe:

Spiral submerged arc pipe, commonly known as spiral submerged arc welded pipe, is formed by rolling hot rolled steel into a spiral shape and welding it along the weld seam using the submerged arc welding method. These pipes offer a high degree of rigidity, strength and corrosion resistance, making them ideal for critical infrastructure projects such as sewers.

Advantages of SSAW pipe in sewer applications:

1. Durability: Spiral submerged arc welded pipes are made of high-quality steel and have excellent durability. They have the strength to withstand heavy loads and extreme underground conditions, ensuring a long service life for sewer pipes.

2. Corrosion resistance: The hot-dip galvanizing process adds an extra layer of protection to the spiral submerged arc welded pipe, making it highly corrosion-resistant. This property is critical for sewer systems because they often encounter aggressive chemical and biological environments.

3. Leak-proof design: The spiral submerged arc welded pipe is manufactured using a continuous welding process to ensure a leak-proof structure. This feature prevents any possibility of penetration or leakage, thereby minimizing the potential for ground contamination and the need for expensive repairs.

4. Flexibility and adaptability: Spiral submerged arc welded pipe can be manufactured to fit a variety of diameters, lengths and slopes, allowing greater flexibility in sewer system design. They can easily adapt to changes in terrain and direction, ensuring smooth flow of wastewater even in complex sewer networks.

5. Cost-Effectiveness: Compared with traditional sewer pipe materials such as concrete or clay, spiral submerged arc welded pipes can provide significant cost savings in installation and maintenance. Their lightweight nature reduces shipping costs and they are easy to install, minimizing labor requirements. Additionally, its long service life and minimal maintenance requirements contribute to long-term cost effectiveness.

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.

Applications of SSAW pipes in sewer systems:

1. Municipal Sewer Networks: SSAW pipes are commonly used in the construction of main sewer lines serving residential, commercial and industrial areas. Their strength and corrosion resistance make them an excellent choice for transporting wastewater over long distances.

2. Stormwater drainage: SSAW pipes can effectively manage stormwater runoff and prevent flooding in urban areas. Their robustness allows the efficient transfer of large volumes of water at high water pressures.

3. Sewage treatment plant: Spiral submerged arc welded pipes can be used in the construction of various parts of the sewage treatment plant, including raw sewage pipes, aeration tanks and sludge treatment systems. Their resistance to corrosive chemicals and ability to handle varying pressures make them indispensable in such demanding environments.

In conclusion:

Choosing the correct pipe material is critical to the successful construction and maintenance of your sewer system. Spiral submerged arc pipe (SSAW) has proven to be a cost-effective, durable and versatile sewer infrastructure solution. With their excellent corrosion resistance, leak-proof design, and adaptability to different terrains, SSAW pipes can efficiently transport wastewater, contributing to the overall sustainable development of cities. The use of spiral submerged arc welded pipes in sewer projects can pave the way for enhanced sewer networks to meet the growing demands of urban development.