SPIRAL STEEL PIPE 32’‘ CARBON ASTM API DIN ISO

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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	<0.045	<0.030	>195	315-430	32-33
Q215	0.09-0.15	0.25-0.55	<0.05	<0.045	<0.030	>215	335-450	26-31
Q235	0.12-0.20	0.30-0.70	<0.045	<0.045	<0.030	>235	375-500	24-26
Q345	<0.20	1.0-1.6	<0.040	<0.040	<0.55	>345	470-630	21-22

Q:How are steel pipes used in the marine industry?: Steel pipes are widely used in the marine industry for various applications such as shipbuilding, offshore structures, and underwater pipelines. They provide strength, durability, and corrosion resistance, making them suitable for transporting fluids, gases, and other materials in harsh marine environments. Steel pipes are also used for constructing piers, docks, and oil rigs, as well as for supporting and reinforcing marine structures.

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:Can steel pipes be coated for additional protection?: Yes, steel pipes can be coated for additional protection. Coating the pipes helps to prevent corrosion, enhance durability, and improve resistance to various environmental factors.

Q:How do you calculate the pipe deflection for steel pipes?: To calculate the pipe deflection for steel pipes, you need to consider several factors. The deflection of a pipe is the bending or displacement that occurs when a load is applied to it. Here are the steps to calculate the pipe deflection: 1. Determine the properties of the steel pipe: You need to know the material properties of the steel pipe, including its Young's modulus (E) and its moment of inertia (I). Young's modulus represents the stiffness of the material, while the moment of inertia measures its resistance to bending. 2. Identify the load applied: Determine the type and magnitude of the load that will be applied to the pipe. This could include factors such as internal pressure, external loads, or thermal expansion. 3. Use the appropriate formula: Depending on the type of load and the support conditions of the pipe, you will need to use the appropriate formula to calculate the deflection. For example, if the pipe is simply supported (fixed at both ends), you can use the formula δ = (5 * w * L^4) / (384 * E * I), where δ represents the deflection, w is the load per unit length, L is the length of the pipe, and E and I are the material properties mentioned earlier. 4. Input the values and calculate: Plug in the values of the load, pipe length, and material properties into the formula. By doing so, you can calculate the deflection of the steel pipe. It is important to note that the calculation of pipe deflection is a complex process that requires expertise in structural engineering. Therefore, it is advisable to consult a professional engineer or use specialized software for accurate and reliable results.

Q:How are steel pipes protected against external moisture?: Steel pipes are protected against external moisture through a variety of methods. One common method is the application of a protective coating or paint on the surface of the pipes. This coating acts as a barrier, preventing moisture from coming into direct contact with the steel. The coating can be made of different materials, such as epoxy, polyethylene, or zinc, depending on the specific requirements and environment. Another method of protection is through the use of corrosion inhibitors. These inhibitors are added to the internal or external surfaces of the pipes, forming a protective layer that prevents moisture from causing corrosion. Corrosion inhibitors can be in the form of chemicals, such as rust converters or rust preventatives, which react with the steel to form a protective barrier. Additionally, steel pipes can be protected against external moisture through cathodic protection. This technique involves the use of sacrificial anodes or impressed current to create an electric current that protects the steel. Sacrificial anodes, typically made of zinc, aluminum, or magnesium, are attached to the steel pipes and corrode over time instead of the steel, thus preventing moisture-induced corrosion. Furthermore, proper insulation and waterproofing measures are crucial in protecting steel pipes from external moisture. Insulation materials, such as foam or tape, are applied to the pipes to provide an additional layer of protection and prevent moisture infiltration. Waterproofing measures, such as the use of sealants or membranes, can also be implemented to ensure that no moisture seeps into the pipes. Regular maintenance, including inspections and repairs, is essential to ensure the continued protection of steel pipes against external moisture. By promptly addressing any areas of damage or corrosion, the integrity of the protective measures can be maintained, prolonging the lifespan of the steel pipes and preventing costly repairs or replacements in the future.

Q:What are the different types of pipe coatings used for corrosion protection?: There are several different types of pipe coatings used for corrosion protection. These coatings are applied to the exterior surface of pipes to prevent or delay corrosion, ensuring the longevity and integrity of the pipes. Some of the commonly used pipe coatings for corrosion protection include: 1. Fusion-Bonded Epoxy (FBE) Coatings: FBE coatings are widely used for corrosion protection due to their excellent adhesion and resistance to chemicals, moisture, and abrasion. These coatings are applied by heating the pipe and spraying it with epoxy powder, which then melts and forms a protective layer upon cooling. 2. Polyethylene (PE) Coatings: PE coatings are known for their flexibility and resistance to impact and chemicals. These coatings are typically applied by extrusion or wrapping methods and provide excellent resistance against water, soil, and other corrosive substances. 3. Polyurethane (PU) Coatings: PU coatings offer good resistance to chemicals, moisture, and mechanical damage. They are commonly used for underground pipelines and are applied by spraying or brush coating methods. 4. Coal-Tar Enamel Coatings: Coal-tar enamel coatings are suitable for protecting pipes exposed to highly corrosive environments such as marine conditions or underground applications. They are typically applied by hot or cold wrapping methods and provide excellent resistance to water, acids, and alkalis. 5. Metallic Coatings: Metallic coatings such as zinc, aluminum, or zinc-aluminum alloys are often used as sacrificial coatings to protect the underlying steel pipes. These coatings corrode preferentially, sacrificing themselves to protect the pipe from corrosion. 6. Asphalt Coatings: Asphalt coatings provide a robust barrier against moisture, chemicals, and soil. They are typically applied by hot or cold wrapping methods and are commonly used for underground pipelines. It is important to consider factors such as the specific environment, temperature, and expected lifespan of the pipes when selecting the appropriate type of pipe coating for corrosion protection.

Q:How do you join two steel pipes together without welding?: There are various ways to join two steel pipes together without welding. Mechanical fittings or connectors are commonly used for this purpose. These fittings are designed to securely connect pipes without the need for welding. Here are a few options you can explore: 1. Threaded Fittings: You can use threaded fittings, which have male and female threads that allow you to screw them together. To join the pipes, you will need to cut the ends of the pipes to create male and female threads. Apply thread sealant to ensure a tight and leak-free connection. 2. Compression Fittings: Another option is compression fittings, which consist of a nut, a compression ring, and a compression seat. These fittings create a tight seal by compressing the ring against the seat. Simply slide the compression ring and nut onto the pipe ends, and use a wrench to tighten the nut until a secure connection is formed. 3. Flange Connections: Flange connections involve using flanges, which are flat plates with bolt holes, to join the pipes. The flanges are bolted together using gaskets to create a tight seal. This method is commonly used for larger diameter pipes or in situations where frequent disassembly may be necessary. 4. Grooved Couplings: Grooved couplings are another option, particularly in plumbing and fire protection systems. They utilize a mechanical coupling housing with two grooved ends that fit over the pipe ends. The coupling is then secured using bolts or screws, which tighten the housing around the pipe ends, creating a secure connection. Before deciding on a method, it is crucial to consider the specific requirements of your application, such as the pipe diameter, pressure, and temperature. Additionally, ensure that the chosen method complies with relevant industry standards and regulations to ensure a safe and reliable connection.

Q:Can steel pipes be used in marine environments?: Indeed, the usage of steel pipes is viable in marine environments. Steel, being a robust and sturdy material, possesses the capability to endure the severe conditions prevalent in marine surroundings, encompassing saltwater exposure, wave impacts, and corrosion. Nevertheless, it is imperative to meticulously choose the appropriate steel variant and implement suitable protective measures to avert corrosion. Stainless steel and corrosion-resistant alloys are often employed in marine applications due to their exceptional resistance against corrosion and ability to withstand continuous saltwater exposure. Furthermore, the application of coatings such as epoxy or zinc can be an effective means of fortifying steel pipes against corrosion. Consistent maintenance and inspections are also pivotal in ensuring the durability and functionality of steel pipes in marine settings.

Q:Are steel pipes resistant to UV degradation?: Steel pipes are generally not resistant to UV degradation. Exposure to ultraviolet (UV) radiation over time can cause steel pipes to undergo various forms of degradation. UV radiation can cause the steel to become brittle, leading to cracking and potential failure. Additionally, UV radiation can also cause corrosion and discoloration on the surface of the steel pipes. To mitigate the effects of UV degradation, protective coatings or paint can be applied to the steel pipes to provide a barrier against UV radiation. Regular maintenance and inspections are also necessary to identify any signs of UV degradation and take appropriate measures to prevent further deterioration.

Q:How are steel pipes used in irrigation systems?: Steel pipes are commonly used in irrigation systems to transport water from a water source, such as a well or a reservoir, to the fields or plants that need to be irrigated. These pipes are durable, strong, and resistant to corrosion, making them ideal for withstanding the constant flow of water and the harsh outdoor conditions. They are typically laid underground or above the surface, depending on the specific irrigation system design, and are connected to sprinklers or drip irrigation systems to distribute water efficiently and effectively to the crops or plants.

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