Author: BaoLaiPipes Official

A pipe spool is a prefabricated section of a piping system made for a defined position or connection scope. Depending on the design, it can include pipe, fittings, flanges and other specified components. Workshop fabrication can reduce site cutting, welding and inspection workload. However, the selected seamless or welded steel pipes still need to match…

Common GI pipe sizes range from DN15 (½ inch) to DN150 (6 inches). Their actual outside diameters are larger than their nominal inch sizes. A DN50 medium pipe, for example, has a specified outside diameter of 60.3 mm, a 3.6 mm wall and a plain-end weight of approximately 5.03 kg/m. The tables below cover common…

Steel pipe expands when its temperature rises and contracts when it falls. The length change is calculated with three values: the pipe’s original length, the temperature difference and the material’s linear expansion coefficient. The basic formula is: ΔL = α × L × ΔT For preliminary calculations, carbon steel is commonly assigned a coefficient of…

Schedule 160 pipe has a much thicker wall than Schedule 40 or Schedule 80 pipe of the same nominal size. Its outside diameter remains unchanged, but the inside diameter becomes smaller and the pipe becomes heavier. It is commonly used in demanding pressure and temperature services. However, Schedule 160 is a dimensional designation, not a…

Schedule 80 steel pipe has a thicker wall, smaller inside diameter and greater weight than Schedule 40 pipe of the same nominal size. It generally provides higher pressure capacity but also increases material, transport and installation costs. Schedule 40 is widely used for general water, air, fire protection and industrial services. Schedule 80 is more…

To measure steel pipe size, take the outside diameter on a straight section with a caliper or diameter tape. If only the circumference is accessible, divide it by π. Match the result to an NPS and DN chart, then measure the wall thickness. This method applies when identifying standard welded steel pipes in storage or…

Nominal diameter is a standardized size designation used to identify pipes, valves, flanges and other piping components. It is not necessarily the pipe’s actual inside diameter or outside diameter. To determine the physical dimensions, you must read the nominal size together with the applicable dimensional standard and pipe schedule. This distinction explains why a “2-inch…

The main difference between A500 and A513 steel tubing is their intended use. ASTM A500 specifies structural tubing with minimum strength requirements for load-bearing applications. ASTM A513 covers electric-resistance-welded mechanical tubing, where dimensional accuracy, surface finish and fabrication performance are often more important. Buyers comparing A513 and A500 steel tubing should choose A500 when structural…

Cold changes the way steel fails. A pipe that remains strong at room temperature may become brittle when exposed to refrigerated fluids, pressure reduction or severe winter conditions. ASTM A333 addresses this risk by requiring carbon and alloy steel pipe to demonstrate notch toughness at specified low temperatures. The standard covers nine ferritic steel grades,…

ASTM A135/A135M is a specification for electric-resistance-welded steel pipe used to convey gas, vapor, water and other liquids. It covers Grade A and Grade B pipe, with requirements for chemical composition, mechanical properties, manufacturing, dimensions and testing. ASTM A135 pipe is also widely used in water-based fire protection systems. However, ASTM A135 is not exclusively…