SCH 80 Seamless Steel Pipe

Date:2024-09-24Tags:SCH 80, Seamless Steel Pipe

What is seamless steel pipe?

Seamless steel pipe (SMLS Pipe) is a kind of steel pipe made by heating steel billet, perforating, rolling and cooling. Compared with welded steel pipe, seamless steel pipe has significant advantages in appearance and performance. First, the inner and outer walls of seamless steel pipe are smooth, without welds and scales, which can reduce the resistance of fluid flow, prevent fluid contamination, and ensure higher conveying quality. Secondly, seamless steel pipe has excellent strength and pressure resistance, simpler structure, stronger durability, can withstand higher pressure and temperature, suitable for high pressure and high precision working environment, and longer service life.

Definition of SCH 80

SCH 80 (Schedule 80 Pipe) represents a wall thickness grade, usually refers to seamless steel pipe with thicker wall thickness, especially suitable for occasions with high temperature, high pressure and strong corrosion conditions. SCH 80 piping system is often used in the manufacture of chemical equipment, high pressure pipelines, high temperature heaters and other special piping systems. When designing and installing steel pipe systems, it is crucial to choose the right pipe number to ensure the stability and safety of the pipeline system.

How to determine the actual diameter of SCH 80 seamless steel pipe

To determine the actual diameter of SCH 80 seamless steel pipe, you usually need to refer to the specific product specification sheet, standard documents or consult the manufacturer. Here are a few steps:

1. Understand the meaning of SCH 80

SCH 80 is a representation of the wall thickness grade, which reflects the pressure bearing capacity of the steel pipe. Different wall thickness grades correspond to different wall thickness ranges, so it is necessary to choose according to the actual use scenario of the pipeline.

2. Find relevant standards or specification sheets

You can refer to standard documents such as ASME, ASTM, GB, etc. These documents usually list parameters such as nominal diameter, outer diameter and wall thickness of steel pipes of different specifications. In addition, if SCH 80 is the naming method of a specific manufacturer, you need to find the product specification sheet provided by the manufacturer.

3. Determine the actual diameter

There is a relationship between the nominal diameter (DN) and the outer diameter. By referring to the relevant standards or specification sheets, combined with the known nominal diameter and the wall thickness range of SCH 80, the actual outer diameter can be inferred using a formula (such as "nominal diameter = outer diameter - 2 × wall thickness").

Notes

The naming and representation methods under different standards may be different, so when consulting the documents, you need to pay attention to the matching of the selected standard with the required steel pipe. If you cannot determine it, it is recommended to consult the manufacturer or supplier directly for professional support.

Wall thickness standard of seamless steel pipe

Seamless steel pipes are divided into two categories: hot-rolled and cold-rolled (drawn). Hot-rolled seamless steel pipes include general steel pipes, low-pressure boiler steel pipes, high-pressure boiler steel pipes, alloy steel pipes, etc. In addition to the above types, cold-rolled seamless steel pipes also include thin-walled steel pipes and special-shaped steel pipes. The outer diameter of hot-rolled seamless steel pipes is generally greater than 32mm, and the wall thickness can reach 2.5-75mm, while the outer diameter of cold-rolled seamless steel pipes can be as small as 6mm, and the wall thickness can be as low as 0.25mm. The outer diameter of thin-walled pipes can reach 5mm, and the wall thickness is less than 0.25mm, and the dimensional accuracy of cold rolling is usually higher than that of hot rolling.


Schedule 80 steel pipe dimensions in mm

Nominal size [inches] Outside diameter [inches] Outside diameter [mm] Wall thickness [inches] Wall thickness [mm] Weight [lb/ft] Weight [kg/m]
1/8 inches 0.405 inches 10.3 MM 0.068 inches 1.73 MM 0.24 lb/ft 0.37 kg/m
1/4 inches 0.540 inches 13.7 MM 0.088 inches 2.24 MM 0.42 lb/ft 0.84 kg/m
1/2 inches 0.840 inches 21.3 MM 0.109 inches 2.77 MM 0.85 lb/ft 1.27 kg/m
3/4 inches 1.050 inches 26.7 MM 0.113 inches 2.87 MM 1.13 lb/ft 1.69 kg/m
1 inches 1.315 inches 33.4 MM 0.133 inches 3.38 MM 1.68 lb/ft 2.50 kg/m
1 1/4 inches 1.660 inches 42.2 MM 0.140 inches 3.56 MM 2.27 lb/ft 3.39 kg/m
1 1/2 inches 1.900 inches 48.3 MM 0.145 inches 3.68 MM 2.72 lb/ft 4.05 kg/m
2 inches 2.375 inches 60.3 MM 0.154 inches 3.91 MM 3.65 lb/ft 5.44 kg/m
2 1/2 inches 2.875 inches 73.0 MM 0.203 inches 5.16 MM 5.79 lb/ft 8.63 kg/m
3 inches 3.500 inches 88.9 MM 0.216 inches 5.49 MM 7.58 lb/ft 11.29 kg/m
3 1/2 inches 4.000 inches 101.6 MM 0.226 inches 5.74 MM 9.11 lb/ft 13.57 kg/m
4 inches 4.500 inches 114.3 MM 0.237 inches 6.02 MM 10.79 lb/ft 16.07 kg/m
5 inches 5.563 inches 141.3 MM 0.258 inches 6.55 MM 14.62 lb/ft 21.77 kg/m
6 inches 6.625 inches 168.3 MM 0.280 inches 7.11 MM 18.97 lb/ft 28.26 kg/m
8 inches 8.625 inches 219.1 MM 0.322 inches 8.18 MM 28.55 lb/ft 42.55 kg/m
10 inches 10.750 inches 273.0 MM 0.365 inches 9.27 MM 40.48 lb/ft 60.31 kg/m
12 inches 12.750 inches 323.8 MM 0.406 inches 10.31 MM 53.52 lb/ft 79.73 kg/m
14 inches 14 inches 355.6 MM 0.375 inches 11.13 MM 54.57 lb/ft 94.55 kg/m
16 inches 16 inches 406.4 MM 0.500 inches 12.70 MM 82.77 lb/ft 123.30 kg/m
18 inches 18 inches 457.0 MM 0.562 inches 14.27 MM 104.67 lb/ft 155.80 kg/m
20 inch 20 inch 508.0 MM 0.594 inch 15.09 MM 123.11 lb/ft 183.42 kg/m
24 inch 24 inch 610.0 MM 0.688 inch 17.48 MM 171.29 lb/ft 255.41 kg/m
32 inch 32 inch 813.0 MM 0.688 inch 17.48 MM 230.08 lb/ft 342.91 kg/m

Application of SCH 80 seamless steel pipes

SCH 80 seamless steel pipes are usually used in places that need to withstand high pressure, such as petrochemicals, pipeline transportation, etc. Its thick wall design enables it to work reliably under extreme temperature and pressure conditions, and is widely used in many fields such as chemical, pharmaceutical, aerospace and construction.
Seamless Steel Pipe

Summary

SCH 80 seamless steel pipe has become the preferred material in high-pressure and highly corrosive environments due to its excellent performance and wide application. By understanding its wall thickness standards and related applications, this steel pipe can be better selected and used in actual projects. Seamless steel pipe not only provides higher fluid delivery quality, but also ensures the safety and reliability of the pipeline system due to its high pressure and high temperature resistance. When selecting seamless steel pipes, be sure to pay attention to important parameters such as wall thickness and diameter to ensure its stability and durability in specific environments.

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