Sch 40 Steel Pipe Dimensions And Weight

"Sch 40 steel pipe" refers to the thickness and pressure rating of the pipe.

Schedule 40 steel pipe represents a standardized wall thickness classification defined by ASME B36.10M, governing welded and seamless wrought steel pipe dimensions for high- and low-temperature pressure service.

What Is Schedule Meaning?

The term "Schedule" refers to the wall thickness of a pipe. It is derived from the Barlow’s Formula relationship between internal pressure and allowable stress. Unlike older systems that used terms like "Standard (STD)" or "Extra Strong (XS)," the Schedule system provides a numerical scale for precision engineering.

According to the National Institute of Standards and Technology, dimensional consistency in piping is critical for the "interoperability of pressure-containing components in complex fluid systems." For Sch 40, the wall thickness increases as the Nominal Pipe Size increases, but the relationship is non-linear.

Sch 40 Steel Pipe Dimensions And Weight Table

The table below lists the diameter, wall thickness, and corresponding weight of ASME B36.19 standard:

NPS (DN)	Schedule  No	Outside Diameter, in. (mm)	Wall   Thickness in. (mm)	Plain End Weight  (Mass) Ib/ft(kg/m)
1/8(6)	40S	0.405(10.29)	0.068(1.73)	0.24(0.37)
1/4(8)	40S	0.540(13.72)	0.088(2.24)	0.43(0.63)
3/8(10)	40S	0.675(17.14)	0.091 (2.31)	0.57 (0.84)
1/2(15)	40S	0.840(21.34)	0.109(2.77)	0.85(1.27)
3/4(20)	40S	1.050(26.67)	0.113(2.87）	1.13(1.68)
1(25)	40S	1.315 (33.40)	0.133 (3.38)	1.68  (2.50)
1 1/4 (32)	40S	1.660 (42.16)	0.140(3.56)	2.27(3.39）
1 1/2 (40)	40S	1.900(48.26)	0.145(3.68)	2.72 (4.05)
2(50)	40S	2.375(60.32)	0.154(3.91)	3.66(5.44)
2 1/2(65)	40S	2.875(73.02)	0.203 (5.16)	5.80(8.64)
3(80)	40S	3.500(88.90)	0.216(5.49)	7.58(11.29)
3 1/2(90)	40S	4.000(101.60)	0.226(5.74)	9.12(13.57)
4(100)	40S	4.500(114.30)	0.237(6.02)	10.80(16.08)
5(125)	40S	5.563(141.30)	0.258(6.55)	14.63(21.77)
6(150)	40S	6.625(168.28)	0.280(7.11)	18.99(28.26)
8(200)	40S	8.625(219.08)	0.322(8.18)	28.58(42.55)
10(250)	40S	10.75(273.0)	0.365(9.27)	40.52(60.29)
12(300)	40S	12.75(323.8)	0.375(9.52)	49.61(73.79)
14(350)	40S	14.00(355.6)	0.375(9.52)	54.62(81.25)
16(400)	40S	16.00(406.4)	0.375(9.52)	62.64(93.18)
18(450)	40S	18.00(457.2)	0.375(9.52)	70.65(105.17)
20(500)	40S	20.00(508.0)	0.375(9.52)	78.67(117.03)
24(600)	40S	24.00(609.6)	0.375(9.52)	94.71(140.89)

Sch 40 Steel Pipe Applications

Construction: Among the various applications of metal, the primary uses are structural support, scaffolding, and piping systems for residential and commercial buildings.

Agriculture: Its applications include irrigation systems, greenhouse structures, and water transport.

Manufacturing: This metal is used to manufacture industrial pipelines for transporting liquids and gases in factories.

Oil and Gas: It is used for transporting products, drilling activities, and constructing supporting structures.

Water Treatment: Sch 40 steel pipe is irreplaceable in water treatment and distribution systems, filtration, and wastewater management.

Sch 40 Steel Pipe Installation Guide

Procedure: Before installation begins, ensure all tools and materials are ready. This includes cutting tools, threading equipment, pipe wrenches, sealant, and measuring equipment. Inspect the pipes for damage and remove any dirt or other substances.

Cutting and Threading: Ensure the correct cutting tools are used to not only isolate pipe components but also create a strong, bonded lip and edge. Additionally, if the pipes are threaded, ensure the connection is smooth and precise to prevent leaks during use.

Assembly and Alignment: Pipes should be carefully installed onto the fittings to ensure unrestricted flow and proper pressure throughout the system. Incorrect adjustment can lead to inefficiency or damage to the machine.

Sealing: Applying the correct sealant or tape to the threaded areas of the pipes is crucial to ensure the joints are waterproof and gas-proof. Application should be consistent and complete to prevent any leaks.

Protection: Support the pipes using clamps, brackets, or other methods. This is essential to prevent tensile stress on the joints and to maintain the stability of the entire system during operation.

Testing and Inspection: After installation and sealing, pressure testing and inspection should be performed to detect leaks and weak points. Address all issues immediately, then begin full system operation.

Maintenance Practices: Conduct regular inspections and maintenance to monitor the strength of the pipeline throughout its lifespan. This not only ensures consistent pipeline performance but also extends its service life.

FAQs

What is Schedule 40 Pipe?

Schedule 40 pipe is a type of steel pipe, also known as Sch 40, and is an ASTM-certified product. It refers to the pipe wall thickness, which, according to the standard, is determined by the pipe diameter.

What are the dimensions of 40 Sch steel pipe?

The dimensions of 40 Sch steel pipe depend on the nominal diameter (NPS). For example, the outer diameter and thickness of 40 Sch steel pipe are limited by standard weight classes. A complete 40 Sch steel pipe size chart can help you determine the specific size suitable for your application.

What is the pressure rating of Schedule 40 pipe?

The pressure rating of Schedule 40 pipe depends on its size and material. It can withstand pressures up to 1 MPa, which is still within the range of medium pressure applications, and the pipe is 5-10 times lighter than higher-strength pipes. Therefore, if your process requires higher pressures, then the thicker, stronger Schedule 80 and XXS pipes are your preferred choice.

Can 40 Schedule steel pipe be used for chemical processing?

Of course, 40 schedule steel pipes, once galvanized or hot-dip galvanized, can be used in chemical processing. The latter gives the former stronger corrosion resistance, making it ideal for transporting corrosive substances.

How much does a Sch 40 steel pipe weigh?

The diameter, dimensions, and wall thickness determine the weight of a Sch 40 steel pipe. For example, an NPS 10 gauge Sch 40 steel pipe weighs approximately 1.68 pounds per foot. Therefore, understanding the weight of 40sch steel pipe is an important factor to consider when planning transportation and installation.

What are the applications of Schedule 40 pipes?

Schedule 40 pipes are widely used in various fields, including low-pressure water applications, domestic piping, and industrial piping systems. Their strength and durability in natural gas and water transportation make them suitable even for harsh conditions.