WELDED LSAW STEEL PIPE

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LSAW Steel Pipe

1 Size: 219-3200 mm*5-25.4mm
2 Material Q235/Q345/20#/X42-X65/J55 etc

Standard:
EN-10208-1/2, GB9711.1/2 etc.

Steel Grade:
B, X42 up to X70; L245, L290 up to L48

Usage:
Used for Steel Structure

Size:
LSAW from 219.1mm to 3200mm, thickness from 5mm to 25.4mm
Ends: Beveled ends with protector

Surface:
Bare / Varnish coating / FBE, 3PE coating DIN30670 / or by client option

Packing:
Casing, bundled shipping in containers or by break bulk vessel

Process	Longitudinal Submerged- Arc Welded Steel Pipe (DSAW -Double Submerged arc welded)
Usage	Used for liquid delivery, such as water, gas, and oil; construction and piling
Standard	API 5L(PSL1,PSL2), ASTM A252,EN10217, EN10219,KS F4602, KS D3583, BS, JIS, IS
Certificate	ISO 9001:2008, ISO 14001, ISO 18001, API 5L (PSL1, PSL2),EN10217, EN10219 and so on.
Outside Diameter	323.9 mm-2134 mm (12"-84")
Wall Thickness	6 mm - 80mm
Length	6 – 14 m
Grade	API 5L: GR A, GR B, X42,X46, X56, X60,X65,X70 ASTM A252 GR 1, GR 2, GR 3 EN 10219: S275, S275JR, S355JRH, S355J2H EN 10224, L235,L275,L355
Surface	Fusion bond Epoxy coating, Coal Tar Epoxy, 3PE, Varnish Coating, Bitumen Coating, Black Oil coating as per customer’s requirement
Test	Chemical Component Analysis, Mechanical Properties (Tensile strength, Yield strength, Elongation), Hydrostatic Test, X-ray Test,Size Inspection.
Mill Test Certificate	Mill Test Certificate:EN 10204/3.1B

Q: How are steel pipes used in the fabrication of storage tanks?: Steel pipes are commonly used in the fabrication of storage tanks due to their strength, durability, and corrosion resistance. They are utilized in various ways, such as forming the structural framework of the tank, creating the walls and roof, and connecting different components together. Additionally, steel pipes can be welded or bolted to ensure a secure and leak-proof construction, making them an ideal choice for storage tank fabrication.

Q: How do you prevent steel pipes from rusting?: To prevent steel pipes from rusting, various measures can be taken. One effective method is to apply a protective coating on the surface of the pipes. This can be done using different types of coatings such as paint, epoxy, or zinc. These coatings act as a barrier between the steel and the corrosive environment, preventing moisture and oxygen from coming into direct contact with the metal and causing rust. Another approach is to use corrosion inhibitors. These substances are added to the water or fluid flowing through the pipes to create a protective film on the steel's surface. This film acts as a shield, inhibiting the corrosion process and preventing rust formation. Regular maintenance is crucial in preventing rust on steel pipes. This includes inspecting the pipes for any signs of damage or corrosion and promptly repairing or replacing any compromised areas. Additionally, keeping the pipes clean and dry by removing any accumulated dirt or moisture helps to prevent rust formation. In some cases, it may be beneficial to use stainless steel pipes instead of regular steel. Stainless steel contains chromium, which forms a passive oxide layer on the surface of the metal. This layer acts as a natural barrier against corrosion, making stainless steel pipes highly resistant to rust. Lastly, controlling the environment in which the pipes are installed can also help prevent rust. This can be achieved by maintaining proper ventilation, controlling humidity levels, and avoiding exposure to harsh chemicals or corrosive substances. By implementing these preventive measures, the lifespan and integrity of steel pipes can be significantly extended while minimizing the risk of rust formation.

Q: How do steel pipes compare to other materials like PVC or copper pipes?: Steel pipes are known for their durability and strength, making them highly preferable for applications that require high pressure and extreme temperatures. In comparison to PVC pipes, steel pipes offer superior resistance to impact, corrosion, and fire, making them suitable for harsh environments. Copper pipes, on the other hand, are primarily used for plumbing and heating systems due to their excellent heat conductivity. While steel pipes may be more expensive than PVC or copper, their robustness and longevity make them a reliable choice for various industrial and infrastructure projects.

Q: What are the quality control measures for steel pipe production?: Quality control measures for steel pipe production typically involve various inspections and tests at different stages of the manufacturing process. Some of the key measures include: 1. Raw material inspection: Ensuring that the steel used for pipe production meets specified standards for chemical composition, mechanical properties, and dimensional accuracy. 2. Dimensional inspection: Checking the outer diameter, wall thickness, and length of the pipes to ensure they meet the required specifications. 3. Welding inspection: Verifying the quality of welds by conducting non-destructive tests, such as ultrasonic or radiographic testing, to detect any defects or discontinuities. 4. Surface inspection: Examining the pipe surface for any defects, such as scratches, pits, or corrosion, which can affect the overall quality and performance. 5. Mechanical testing: Performing tests like tensile strength, yield strength, and impact resistance to assess the mechanical properties of the pipes and ensure they meet the desired standards. 6. Pressure testing: Subjecting the pipes to hydrostatic or pneumatic pressure tests to verify their ability to withstand the intended operational pressures without leakage or failure. 7. Coating inspection: Checking the quality and uniformity of any protective coatings or linings applied to the pipes to prevent corrosion or other forms of deterioration. 8. Documentation and traceability: Maintaining records of all inspections, tests, and certifications to provide traceability and ensure compliance with relevant industry standards and customer requirements. These quality control measures help to ensure that steel pipes are manufactured to the highest standards, possess the required mechanical and dimensional properties, and are fit for their intended application.

Q: How do steel pipes perform in extreme temperature variations?: Steel pipes perform well in extreme temperature variations due to their high thermal conductivity and resistance to expansion and contraction. They are able to withstand both high and low temperatures without losing their structural integrity or experiencing significant changes in dimensions. This makes steel pipes suitable for a wide range of applications, including those in industries with extreme temperature conditions, such as oil and gas, chemical processing, and power generation.

Q: How do you determine the pipe schedule for steel pipes?: Several factors, including pressure rating, wall thickness, and outer diameter, are taken into account to determine the pipe schedule for steel pipes. The pipe schedule serves as a standardized system that classifies the thickness of pipe walls, ensuring compatibility and safety in various applications. To ascertain the pipe schedule for steel pipes, one must consider the maximum pressure the pipe will endure, typically measured in pounds per square inch (psi) or bars. The pressure rating indicates the pipe's ability to withstand pressure without experiencing failure or leakage. Higher pressure ratings necessitate thicker pipe walls. Another crucial factor in determining the pipe schedule is the wall thickness, typically expressed in inches or millimeters. The wall thickness directly correlates with the pressure rating, as thicker walls have the capacity to handle higher pressures. The American National Standards Institute (ANSI) has established a set of standardized wall thicknesses for steel pipes known as the "pipe schedule." The outer diameter of the pipe is also taken into consideration when determining the pipe schedule. The specific application and requirements influence the outer diameter variation. Selecting a pipe with the appropriate outer diameter is essential to ensure proper fit and compatibility with fittings, valves, and other components. In conclusion, the pipe schedule for steel pipes is determined by examining the maximum pressure, wall thickness, and outer diameter. By aligning these factors with the suitable pipe schedule, one can guarantee that the steel pipe is appropriate for its intended usage and capable of withstanding the required pressure.

Q: How do steel pipes handle thermal expansion and contraction?: The unique properties and design of steel pipes enable them to handle thermal expansion and contraction. When exposed to high temperatures, steel pipes expand as the molecules in the material gain energy and become more active. Conversely, when exposed to low temperatures, steel pipes contract as the molecules lose energy and become less active. To accommodate these changes, steel pipes are manufactured with specific features. One such feature is the inclusion of clearance between pipe joints. This clearance allows for expansion and contraction without causing stress or deformation in the pipe. Additionally, expansion joints or flexible connectors are used within the piping system to absorb thermal movements and prevent damage. Moreover, steel pipes are commonly installed with appropriate anchoring and support systems. These systems are designed to allow the pipes to expand and contract within a certain range without exerting excessive stress or strain on the structure or surrounding components. Anchoring and support systems also help maintain the overall stability and integrity of the piping system. In certain cases, thermal insulation materials are applied to steel pipes to minimize temperature changes and mitigate the effects of expansion and contraction. These insulating materials assist in maintaining a consistent temperature within the pipe, thereby reducing the magnitude of thermal movements. Overall, due to their inherent strength and flexibility, steel pipes are well-equipped to handle thermal expansion and contraction. With proper design, installation, and maintenance, steel pipes can effectively accommodate temperature changes without compromising their structural integrity or functionality.

Q: How are steel pipes repaired in case of damage?: Steel pipes are typically repaired by first identifying the damaged section of the pipe. Then, the damaged area is cut out and replaced with a new section of pipe. This new section is welded or clamped into place to ensure a secure connection. In some cases, epoxy or other sealants may be used to repair smaller cracks or leaks. Overall, the repair process aims to restore the structural integrity and functionality of the steel pipes.

Q: How does galvanization protect steel pipes from corrosion?: Galvanization protects steel pipes from corrosion by applying a protective zinc coating on the surface of the pipes. This zinc coating acts as a sacrificial anode, meaning it corrodes first before the steel, effectively preventing rust and corrosion from reaching the underlying steel.

Q: Do steel pipes require maintenance?: Yes, steel pipes do require maintenance. Regular maintenance is necessary to ensure their proper functioning and longevity. This may involve cleaning, inspecting for any signs of corrosion or damage, and applying protective coatings to prevent rusting. Additionally, periodic maintenance checks and repairs may be needed to address any leaks or structural issues that may arise over time.

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