high quality api 5ct erw steel pipe

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WELDED ROUND STEEL PIPE

Commodity	Steel Pipe and Tube
Features	OD(mm)	Thickness(mm)	Length(m)
Cross-sectional	OD(mm)	Thickness(mm)	Length(m)
Round:	21.3-273.1	1.0-9.5	5.8/6 or you require
Square:	1515-300300	1.0-15.0	5.8/6 or you require
Rectangular:	1015-350400	1.0-15.0	5.8/6 or you require

National Standard
Welded Steel Pipe For Transportation Of Low Pressure Fluid
GB/T13091-2001
1	Outside Diameter Of Steel Pipe
	Outside Diameter D/mmm	Tolerance Of Pipe Outside Diameter	Tolerance Of Pipe And Outside Diameter/mm
	D≤48.3	±0.5mm
	48.3<D≤508	±1.0%
	168.3<D≤508	±0.75%	+2.4 -0.8
	D>508	±1.0%	+3.0 -0.8
	Tolerance Of Wall Thickness	±12.5%
2	Length	Usual Length	Tolerance
		4M-9M	+20 -0
		Multiple Length:5-10mm Tolerance For Each Mutiple	+20 -0
3	Bending	≤168.3mm	Straight For Ordinary Use Or Negotiate The Bending
3	Bending	>68.3mm	Smaller Than 0.2%Of Full Length Steel Pipe

Nominal Pipe size (inch)	Outside Diameter (mm)	Schedule 1
		Nominal Wall Thickness (mm)	Weight(kg/m)
		Nominal Wall Thickness (mm)	Small	Big
1/2”	20	1.0-2.75	0.467	1.168
3/4”	25	0.9-2.75	0.662	1.55
1”	32	1.0-3.25	0.693	2.341
11/4	40	1.0-3.25	1.24	2.945
11/2	47	1.0-3.5	1.367	3.5
2	59	1.5-3.5	3.758	4.716
21/2	75	1.5-3.75	2.718	6.588
3	88	1.8-3.75	3.825	7.79
4	114	1.5-4.0	4.16	10.85
5	140	2.5-4.25	8.476	14.227
6	165	2.5-4.5	10.017	17.717
8	219	3.5-5.0	18.572	26.385

Q: Are steel pipes suitable for underground oil pipelines?: Yes, steel pipes are suitable for underground oil pipelines. Steel pipes are commonly used in underground oil pipelines due to their durability, strength, and resistance to corrosion, making them a reliable choice for transporting oil over long distances. Additionally, steel pipes can withstand high pressure and extreme temperatures, ensuring the safe and efficient transport of oil underground.

Q: How are steel pipes used in airport infrastructure?: Steel pipes are widely used in airport infrastructure for various purposes. They are used for constructing the framework of airport terminals, hangars, and other buildings. Steel pipes are also used for the installation of HVAC systems, electrical wiring, and plumbing in airport facilities. Additionally, steel pipes are used for the construction of runways, taxiways, and aprons, providing a strong and durable foundation for aircraft operations.

Q: What is the difference between seamless steel pipe and welded pipe?: The thicker the diameter, the more commonly the spiral weld. The seamless steel pipe is generally molten state molten steel through the annular slot backlog, and then stretched and other treatment process, so that there is no weld. On the performance, especially the pressure capacity of the steel pipe than ordinary steel has greatly improved, so often used for high voltage equipment.

Q: What does "spiral welded steel pipe" DN325*10 mean?: Spiral welded steel pipe with nominal diameter of 325mm and wall thickness of 10mm

Q: How do steel pipes handle high-velocity flow?: Steel pipes are designed to handle high-velocity flow efficiently due to their inherent strength and durability. The smooth interior surface of steel pipes minimizes friction, allowing for smooth flow and reducing energy loss. Additionally, the sturdy construction of steel pipes enables them to withstand the pressures and forces exerted by high-velocity flow without deformation or failure.

Q: What are the common methods for inspecting the integrity of steel pipes?: To inspect the integrity of steel pipes, various methods are employed. These methods play a vital role in identifying any faults or weaknesses in the pipes that could jeopardize their structural soundness and potentially result in failures or leaks. 1. Visual Inspection: This method involves a visual examination of the external surface of the steel pipe by an inspector. The purpose is to spot any signs of damage, such as corrosion, cracks, or deformities. Although it is a quick and cost-effective approach, it may not be sufficient to detect internal defects. 2. Ultrasonic Testing (UT): UT is a non-destructive testing method that utilizes high-frequency sound waves to identify flaws in steel pipes. A transducer emits ultrasonic waves into the pipe, and any waves that bounce back are analyzed to detect defects like cracks or voids. UT is effective for inspecting both the internal and external aspects of the pipe and can provide precise measurements of defect size and location. 3. Magnetic Particle Inspection (MPI): MPI is primarily employed to detect surface or nearby surface defects in ferromagnetic materials like steel. Magnetic particles are applied to the pipe's surface, and if there is a defect, these particles will gather around it, creating a visible indication. MPI is particularly useful in identifying cracks and other discontinuities that may not be easily visible to the naked eye. 4. Radiographic Testing (RT): RT involves the use of X-rays or gamma rays to examine the internal structure of steel pipes. These rays pass through the material, and an image is recorded on a radiographic film or a digital detector. This method is effective in detecting internal defects such as cracks, voids, or inclusions. However, it necessitates proper safety measures due to the use of radiation. 5. Eddy Current Testing (ECT): ECT is a non-destructive testing method that relies on electromagnetic induction to assess the integrity of steel pipes. An alternating current is passed through a probe, generating an electromagnetic field. Any alterations in the material's electrical conductivity or magnetic permeability caused by defects are detected by the probe, providing information about the pipe's condition. These represent some of the commonly used techniques for inspecting the integrity of steel pipes. Each method possesses its own advantages and limitations, and the choice of inspection method depends on factors such as the type of defect to be identified, access to the pipe, and budgetary considerations. Regular inspection and maintenance using these methods are crucial to ensure the secure and dependable operation of steel pipe systems.

Q: How are steel pipes used in the manufacturing of hydraulic systems?: Steel pipes are commonly used in the manufacturing of hydraulic systems due to their durability, strength, and resistance to high pressure. These pipes are used to transport hydraulic fluids, such as oil or water, throughout the system, ensuring the smooth operation of various components, such as pumps, valves, and cylinders. The steel pipes provide a reliable and leak-free connection between these components, allowing for efficient transfer of power and control in hydraulic systems.

Q: Are steel pipes suitable for use in nuclear power plants?: Yes, steel pipes are suitable for use in nuclear power plants. They are commonly used in various systems such as cooling, steam, and reactor coolant systems due to their high strength, durability, and resistance to corrosion. Additionally, steel pipes can withstand the high pressure and temperature conditions present in nuclear power plants, making them a reliable choice for this critical infrastructure.

Q: How are steel pipes protected against fire?: Steel pipes are typically protected against fire through the application of fire-resistant coatings or by encasing them in fire-rated materials, such as concrete or gypsum board. Additionally, fire sprinkler systems or fire-resistant insulation may be installed around the pipes to provide an added layer of protection.

Q: Can steel pipes be used for oil refineries?: Yes, steel pipes are commonly used in oil refineries due to their high strength, durability, and resistance to corrosion, making them suitable for transporting various petroleum products and chemicals within the refinery infrastructure.

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