SPIRAL STEEL PIPE 48‘‘ ASTM API LARGE DIAMETER PIPE

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Loading Port:: Tianjin

Payment Terms:: TT OR LC

Min Order Qty:: 5 m.t.

Supply Capability:: 3000 m.t./month

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Packaging & Delivery

Packaging Detail:	standard export packing or as customer's requirement
Delivery Detail:	within 10 - 30 days

Specifications

Spiral Welded Steel Pipes and Tubes
1.Material:Q195-Q235
2.Length:1-12m
3.WT:1.0-14mm
4.O.D.:20-273mm

Spiral Welded Steel Pipes and Tubes

Product Description:

1.Material : Q235,Q345,L245,L290,L360,L415,L450,L485,GrB,X42,46,X52,X56,X60,X65,X70,X80,X100

2,Standard: SY/T5037-2000,GB/T9711-2011,API Spec 5L PSL1/PSL2,ASTM A252\A53,ISO3183,DIN17172,EN10217,JIS G3457,AWWA C200,ASTM A139,ASTM A671,ASTM A672

3.Wall thickness: 3.0mm-30mm

4.Outer diameter: φ168mm-3020mm

5,Length: 5m-12m or as your requirement

6,Corrosion protection standard: DIN30670,DIN30671, AWWAC210, AWWA C203, SY/T0413-2002,SY/T0414-2002

7,Application: Oil, gas, natural gas, water pipe, thermal electricity pipe, steel structure engineering, etc

Q195-q345 Material Steel Pipe's Materials

Elements Material	Chemical Compsition%					Mechanical Property
	C%	Mn%	S%	P%	Si%	Yield Point (Mpa)	Tensile Strength(Mpa)	Elongation (%)
Q195	0.06-0.12	0.25-0.50	<0.050< span="">	<0.045< span="">	<0.030< span="">	>195	315-430	32-33
Q215	0.09-0.15	0.25-0.55	<0.05< span="">	<0.045< span="">	<0.030< span="">	>215	335-450	26-31
Q235	0.12-0.20	0.30-0.70	<0.045< span="">	<0.045< span="">	<0.030< span="">	>235	375-500	24-26
Q345	<0.20< span="">	1.0-1.6	<0.040< span="">	<0.040< span="">	<0.55< span="">	>345	470-630	21-22

Q: How do steel pipes handle extreme temperatures?: Steel pipes are designed to handle extreme temperatures due to their high thermal conductivity and resistance to heat. At high temperatures, steel pipes expand but maintain their structural integrity, preventing them from warping or weakening. Additionally, steel's low thermal expansion coefficient allows it to withstand rapid temperature changes without significant damage. Overall, steel pipes are well-suited for transporting hot or cold fluids and gases in various industrial applications.

Q: How are steel pipes used in building foundations?: Steel pipes are often used in building foundations as piles or piers. They are driven into the ground to provide structural support and stability for the building. The steel pipes act as load-bearing elements, transferring the weight of the structure to the underlying soil or rock. Additionally, they can also be utilized for underground utility installations or as part of a drainage system in building foundations.

Q: What is the impact of steel pipe size on flow rate and pressure?: Both the flow rate and pressure are significantly impacted by the size or diameter of a steel pipe. To begin with, the flow rate represents the amount of fluid that can pass through the pipe within a given time frame. A larger diameter allows for a greater flow rate as it provides more space for the fluid to move through. This is because a larger cross-sectional area creates less resistance for the fluid. Consequently, increasing the size of the steel pipe generally leads to an increase in flow rate. Additionally, the size of a pipe affects the pressure within it. As the fluid flows through the pipe, it encounters friction against the pipe walls, resulting in resistance. This resistance causes a drop in pressure along the length of the pipe. A smaller diameter pipe experiences higher frictional losses, leading to a greater pressure drop. Conversely, a larger diameter pipe reduces frictional losses, resulting in a lower pressure drop. Therefore, increasing the size of the steel pipe typically leads to a decrease in pressure drop. It is important to note that although increasing the size of a steel pipe generally leads to a higher flow rate and lower pressure drop, other factors can also influence these parameters. These factors include the properties of the fluid, the length and layout of the pipe, and the presence of valves or fittings. Therefore, it is crucial to consider all these factors and perform accurate calculations or simulations to determine the specific impact of steel pipe size on flow rate and pressure within a given system.

Q: How are steel pipes cleaned and maintained?: Steel pipes are commonly cleaned and maintained through a variety of methods. Firstly, they are often cleaned using chemical solvents or detergents to remove any dirt, debris, or rust. This process is followed by rinsing the pipes thoroughly with water. Additionally, periodic inspections are conducted to identify any signs of corrosion or damage, which are then repaired promptly to prevent further deterioration. Lastly, applying protective coatings or paints on the pipes can help to enhance their longevity and prevent future corrosion.

Q: What is the difference between internal coating and external lining of steel pipes?: Steel pipes can be protected from corrosion and damage through two different methods: internal coating and external lining. When it comes to internal coating, a protective layer or coating is applied to the inner surface of the steel pipe. This is done to prevent corrosion or damage caused by the fluid or substance being transported through the pipe. Common materials used for the coating include epoxy, polyurethane, or polyethylene. These materials create a barrier between the pipe and the transported material, thus extending the pipe's lifespan and preserving the quality of the transported material. On the other hand, external lining involves applying a protective layer or lining to the outer surface of the steel pipe. The purpose of this is to shield the pipe from external elements like soil, moisture, chemicals, and physical damage. Materials such as polyethylene, polypropylene, or fusion-bonded epoxy are typically used for the external lining. By acting as a barrier, the lining prevents corrosive substances from coming into contact with the pipe and causing harm. Additionally, it helps maintain the pipe's structural integrity and prevents the formation of leaks or cracks. To summarize, the main distinction between internal coating and external lining of steel pipes lies in where the protective layer is applied. Internal coating focuses on the inner surface of the pipe, while external lining concentrates on the outer surface. While both methods aim to safeguard the pipe from corrosion and damage, they address different aspects of pipe protection.

Q: Difference between seamless steel pipe and welded pipe: Seamless steel pipe can be used in various industries, such as liquid, pneumatic, pipeline and gas pipeline.

Q: What are the different types of gaskets used with steel pipes?: There are several types of gaskets used with steel pipes, including spiral wound gaskets, ring joint gaskets, and non-metallic gaskets. These gaskets are used to create a tight seal between pipe flanges, preventing leakage of fluids or gases.

Q: What are the different factors affecting the flow rate of steel pipes?: The flow rate of steel pipes can be affected by multiple factors. Let's explore some of these factors: 1. Pipe diameter: The size of the pipe plays a significant role in determining the flow rate. Generally, larger pipes allow for greater flow rates as they provide a larger cross-sectional area for the fluid to pass through. 2. Pipe length: The length of the pipe also impacts the flow rate. Longer pipes tend to have higher friction losses, which can decrease the flow rate. Moreover, longer pipes may require higher pressure to maintain the desired flow rate. 3. Fluid viscosity: The viscosity of the fluid passing through the pipe is an important consideration. Viscous fluids, such as heavy oils, exhibit higher resistance to flow, resulting in lower flow rates. Conversely, less viscous fluids, like water, encounter lower resistance and can achieve higher flow rates. 4. Pressure difference: The pressure difference across the pipe serves as a driving force for flow. A higher pressure difference will lead to a higher flow rate, while a lower pressure difference will reduce the flow rate. 5. Surface roughness: The roughness of the inner pipe surface influences the flow rate. Rough surfaces generate more turbulence and friction, thus resulting in a lower flow rate. Conversely, smoother surfaces minimize turbulence and friction, allowing for a higher flow rate. 6. Temperature: The temperature of the fluid can impact its viscosity and density, which subsequently affect the flow rate. Higher temperatures generally decrease the viscosity of fluids, leading to increased flow rates. 7. Pipe material: The choice of pipe material impacts the flow rate due to varying roughness and resistance. Steel pipes, for instance, typically possess a smoother inner surface compared to pipes made of other materials, resulting in higher flow rates. 8. Pipe fittings and bends: The presence of fittings, valves, and bends in the pipe can cause flow restrictions and pressure drops, which can decrease the flow rate. Proper design and placement of these components can minimize their impact on the flow rate. Understanding the interplay of these factors is essential for the design and optimization of fluid flow systems involving steel pipes.

Q: What is the maximum allowable pressure for steel pipes?: The maximum allowable pressure for steel pipes depends on various factors such as the type of steel used, the diameter and thickness of the pipe, and the specific application or industry requirements. The American Society of Mechanical Engineers (ASME) provides guidelines and standards for pressure vessel and piping design, including the determination of maximum allowable pressure. ASME B31.1 and B31.3 are widely used codes for power piping and process piping respectively. These codes specify the design criteria for various materials, including steel, and provide formulas and charts to calculate the maximum allowable pressure for different pipe sizes and wall thicknesses. The maximum allowable pressure is typically determined based on the pipe's ability to withstand internal pressure without causing any permanent deformation or failure. It is important to note that the maximum allowable pressure for steel pipes may also be influenced by other factors such as temperature, corrosion, and the presence of any external loads or stresses. Therefore, it is essential to consult the relevant codes, standards, and engineering calculations specific to the application to ensure the safe and reliable operation of steel pipes under the given conditions.

Q: How are steel pipes inspected for quality?: Steel pipes are inspected for quality through a rigorous process that involves various techniques and standards. One common method is visual inspection, where trained professionals examine the pipes for any visible defects such as cracks, dents, or surface irregularities. This visual inspection ensures that the pipes meet the required specifications and are free from any visible flaws. Additionally, non-destructive testing (NDT) methods are employed to evaluate the internal and external quality of the steel pipes. One widely used NDT technique is ultrasonic testing, which involves sending ultrasonic waves through the pipes to detect any internal defects or inconsistencies in the material. This method can identify issues like wall thickness variations, inclusions, or weld defects that may compromise the pipe's integrity. Another popular NDT technique is magnetic particle inspection, which uses magnetic fields and iron particles to identify surface cracks or flaws in the steel pipes. This method is particularly effective for detecting defects in ferromagnetic materials and can be performed on both the outside and inside surfaces of the pipes. Furthermore, hydrostatic testing is often conducted to evaluate the pipes' strength and resistance to pressure. In this process, the pipes are filled with water or another suitable fluid and subjected to a specified pressure to check for leaks or structural weaknesses. This test helps ensure that the pipes are capable of withstanding the intended operational conditions without failure. In addition to these techniques, various quality control measures are implemented throughout the manufacturing process, including material traceability, dimensional checks, and chemical composition analysis. These measures help guarantee that the steel pipes meet the required standards and specifications, ensuring their quality and reliability. Overall, the inspection of steel pipes for quality involves a combination of visual inspection, non-destructive testing methods, and quality control measures. These comprehensive procedures help identify any defects, inconsistencies, or weaknesses, ensuring that the pipes meet the necessary quality standards and are fit for their intended purpose.

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