Large-diameter steel pipes are an important pillar of modern infrastructure design and play a very important role in industrial applications, especially transportation and water conservancy. This article will introduce large-diameter pipes from multiple aspects such as definition, standards, and application scenarios, so that you can have a clear and in-depth understanding of large-diameter steel pipes.
Large diameter steel pipe basic introduction
What is considered a large diameter steel pipe?
Large diameter refers to pipes above 457 mm (16 inches) and 508 mm (20 inches)
Large diameter steel pipes usually refer to pipes with diameters above 457 mm (16 inches) and 508 mm (20 inches). The maximum diameter of ERW is 457 mm 16 inches, and we can call pipes larger than this large diameter pipes.
LSAW and SSAW are two welding processes that manufacture pipes with diameters ranging from 508 mm (20 inches) to 2540 mm (100 inches). Large diameter seamless pipes refer to pipes with diameters exceeding 16 inches or 20 inches.
Material Standards
Almost all steel materials can be used to make large diameter pipes. Here are some common material standards:
ASTM A53B: Welded and straight seam submerged arc welded pipes for general use.
ASTM A671: Welded steel pipes for low temperatures.
ASTM A691: For high-strength steel pipes.
Large diameter stainless steel pipes
Large-diameter stainless steel pipes are also very common and are used in areas such as liquid transportation. They have excellent corrosion resistance and mechanical properties. They are welded using argon arc welding (TIG welding) technology. Material standards generally follow ASTM A312 or EN 10088-3. Common grades include:
TP304/L/H: The first choice for the chemical, food, and pharmaceutical industries.
TP316/L/H: Stronger corrosion resistance than 304, used in chemical environments such as the ocean.
TP310S/H: Suitable for furnaces and heat treatment equipment
Application of large diameter steel pipe
Bored shaft casing
The American Society of Civil Engineers (ASCE) stated in the Standard Guide for Pile Foundation Design and Installation that bored piles without casings have a 38% lower bearing capacity safety factor, so using only large-diameter steel pipes as bored shaft casings can improve construction efficiency.
Structural part
Large diameters show excellent anti-buckling performance when subjected to external pressure. This makes large-diameter steel pipes widely used in bridges, buildings, high-rise structures and other heavy projects.
Caisson
The caisson is an infrastructure component widely used in bridge engineering. It usually uses large-diameter steel pipes with a length of up to 10 feet. It is drilled into the riverbed to provide stable support.
Things to note before purchasing large diameter seamless pipes
First of all, seamless pipes cannot have welds, but some unscrupulous merchants will use imperceptible methods to eliminate welds, so be extra careful. Secondly, pay attention to the overall uniformity and roundness. Large-diameter seamless pipes have high strength. And when the pipe is filled with materials, it will also share some of the weight and can withstand greater pressure. It can work in extremely cold or extremely hot environments.
FAQs:
Is the cost of seamless large-diameter pipes very high?
The price of large-diameter seamless pipes is slightly higher than that of welded pipes, lower than that of ordinary hot-rolled seamless pipes, and higher than that of large-diameter welded pipes such as spiral submerged arc welded pipes and straight seam submerged arc welded pipes.
