Schedule 20 carbon steel pipe

What does "Schedule 20" mean in the pipeline standard?

"Schedule" (SCH) is a standard representation of pipe wall thickness, representing the thickness grade of the pipe. The number 20 indicates the specific thickness grade, which is usually used to identify the thickness and pressure resistance of the pipe. For Schedule 20 Carbon Steel Pipe, this specification is designed for low-pressure systems. The steel pipe wall thickness grade includes 10 grades, including Sch10, 20, 30, 40, 60, 80, 100, 120, 140, 160, etc. The larger the value, the thicker the wall thickness. In fact, for the same pipe diameter, different Sch grades have different specifications for wall thickness.

The pressure grade of a pipe depends on its size: a pipe with a smaller diameter and thicker wall has a higher pressure tolerance, while a pipe with a larger diameter and thinner wall has a lower pressure grade. In engineering design and construction, SCH 20 is often used to identify the specifications and materials of pipes to ensure accuracy during selection and use.

Schedule 20 pipe pressure rating is essential to determine its suitability for various industries, ensuring that it can handle specific pressure loads without risk of failure.

Relationship between steel pipe specifications and use:
The specifications of steel pipes are closely related to their use. Steel pipes of different specifications have different load-bearing capacity and application range. For example, steel pipes marked with SCH 20 are usually used in some occasions where the wall thickness is required but not too high, such as conveying fluids, building temporary structures, etc. In specific use, users need to choose the appropriate steel pipe specifications according to actual needs.

Schedule 20 steel pipe production standards:

Schedule 20 steel pipe production follows a series of international and regional standards, including but not limited to:

ASME B36.10: This standard specifies the size standards and tolerances of steel pipes in detail.
ASTM A53: There are strict requirements on the chemical composition and mechanical properties of carbon steel pipes for pipelines.
DIN 2448: German industry standard that specifies the dimensions and tolerances of seamless steel pipes.

Key Features and Material Properties of Schedule 20 Carbon Steel Pipe:

Material Composition: Schedule 20 carbon steel pipe is made of carbon and iron, providing strength and durability for low-pressure systems.
Wall Thickness: Schedule 20 wall thickness ranges from 6.35 mm to 12.7 mm, affecting the pressure tolerance and weight of the pipe. Thicker walls can withstand higher pressures, while thinner walls are suitable for low-pressure applications.
Nominal Sizes: Schedule 20 sizes range from 8 inches to 36 inches, which can be used in a variety of low-pressure applications.
Pressure Ratings: These pipes are designed for low-pressure systems, and the pressure rating depends on the wall thickness and diameter.
Material Options: In addition to carbon steel, low-alloy steel and stainless steel options are also available to meet specific needs.
Mechanical Properties: The pipes meet industry-standard elongation, yield strength, and tensile strength, ensuring reliability in low-pressure systems.
Weldability: Schedule 20 carbon steel pipes are easy to weld, and strong connections can be achieved using methods such as arc welding or TIG welding.

Surface quality: The surface of the pipe is smooth and defect-free, ensuring durability and suitable for welding and coating processes.

Schedule 20 Steel Pipe Dimensions:

Exporter, Manufacturer & Supplier of SCH 20 Carbon Steel Pipe in ASTM A106 GR.B, A53 GR.B, A335 P22/ P11, API 5L GR.B, A333 GR.3/GR. 6 in China

Nominal size [inches]	Outside diameter [inches]	Outside diameter [mm]	Wall thickness [inches]	Wall thickness [mm]	Weight [lb/ft]	Weight [kg/m]
8 inches	8.625 inches	219.1 mm	0.250 inches	6.35 mm	22.36 lb/ft	33.31 kg/m
10 inches	10.750 inches	273.0 mm	0.250 inches	6.35 mm	28.04 lb/ft	41.77 kg/m
12 inches	12.750 inches	323.8 mm	0.250 inches	6.35 mm	33.38 lb/ft	49.73 kg/m
14 inches	14.000 inches	355.6 mm	0.312 inches	7.92 mm	45.61 lb/ft	67.90 kg/m
16 inches	16.000 inches	406.4 mm	0.312 inches	7.92 mm	52.27 lb/ft	77.83 kg/m
18 inches	18.000 inches	457.0 mm	0.312 inches	7.92 mm	58.94 lb/ft	87.71 kg/m
20 inches	20.000 inches	508.0 mm	0.375 inches	9.53 mm	78.60 lb/ft	117.15 kg/m
22 inches	22.000 inches	559.0 mm	0.375 inches	9.53 mm	86.61 lb/ft	129.13 kg/m
24 inches	24.000 inches	610.0 mm	0.375 inches	9.53 mm	94.62 lb/ft	141.12 kg/m
26 inches	26.000 inches	660.0 mm	0.500 inches	12.70 mm	136.17 lb/ft	202.72 kg/m
28 inches	28.000 inches	711.0 mm	0.500 inches	12.70 mm	146.85 lb/ft	218.69 kg/m
30 inches	30.000 inches	762.0 mm	0.500 inches	12.70 mm	157.53 lb/ft	234.67 kg/m
32 inches	32.000 inches	813.0 mm	0.500 inches	12.70 mm	168.21 lb/ft	250.64 kg/m
34 inches	34.000 inches	864.0 mm	0.500 inches	12.70 mm	178.89 lb/ft	266.61 kg/m
36 inches	36.000 inches	914.0 mm	0.500 inches	12.70 mm	189.57 lb/ft	282.27 kg/m

Schedule 20 Pipes Pressure Rating:

Outer diameter, Inner diameter, & Wall Thickness Dimensions For Given Pipes Sizes
Pipes Size in inch	Schedule 20 Thickness
	Outer diameter.	Inner diameter	Wall Thickness
3/4 inch	1.050 inch	0.920 inch	0.065 inch
1 inch	1.315 inch	1.185 inch	0.065 inch
1-1/4 inch	1.660 inch	1.530 inch	0.065 inch
1-1/2 inch	1.900 inch	1.770 inch	0.065 inch
2 inch	2.375 inch	2.245 inch	0.065 inch
2-1/2 inch	2.875 inch	2.709 inch	0.083 inch
3 inch	3.500 inch	3.334 inch	0.083 inch
3-1/2 inch	4.000 inch	3.834 inch	0.083 inch
4 inch	4.500 inch	4.334 inch	0.083 inch
6 inch	6.625 inch	6.407 inch	0.109 inch
8 inch	8.625 inch	8.407 inch	0.109 inch

Schedule 20 carbon steel pipe manufacturing process:

SCH 20 seamless pipe manufacturing processes mainly include hot rolling, cold rolling and hot extrusion.

1. Hot rolling
The billet heated at high temperature is perforated by a piercing machine to form a rough pipe. Then, the rough pipe is rolled, sized and reduced for many times to finally obtain a seamless steel pipe that meets the specifications.

2. Cold rolling and hot extrusion
It is mainly used to produce seamless steel pipes with high precision and high surface quality. The steel pipe after hot rolling is reprocessed by cold rolling process to improve dimensional accuracy and surface finish. Hot extrusion is the process of forming a billet through a die at high temperature, which improves the mechanical properties and surface quality of the product.

Schedule 20 carbon steel pipe application field:

SCH 20 pipes are suitable for low-pressure working environments. Commonly used in:
Water supply and drainage systems: such as fire protection systems and some industrial cooling water circulation systems.
Oil and gas: sch20 pipes are used as auxiliary pipes for fresh water, nitrogen and other media in oil field water injection systems, natural gas distribution stations, and small liquefied natural gas (LNG) storage facilities.
Food processing and pharmaceutical industries: sch20 pipes can meet corrosion resistance requirements after surface treatment such as galvanizing, and are responsible for the transportation of raw materials and semi-finished products.

FAQ:

What is the use of Schedule 20 carbon steel pipe?
SCH 20 carbon steel pipes are generally used in low-pressure applications such as water supply systems, HVAC and pipelines, which have the lowest pressure requirements.

What is the pressure rating of Schedule 20 carbon steel pipes?
SCH 20 carbon steel pipes are designed to handle low-pressure systems, and the pressure rating depends on the wall thickness and size of the pipe.

What sizes are available for Schedule 20 carbon steel pipes?
The nominal size of SCH 20 carbon steel pipes ranges from 8 inches to 36 inches, providing a variety of options for different applications.

How does Schedule 20 carbon steel pipe compare to other specifications?
Schedule 20 carbon steel pipe has a thinner wall than Schedule 40 pipe and higher and is used in applications with lower pressure tolerances.

Is Schedule 20 carbon steel pipe suitable for outdoor use?
Schedule 20 carbon steel pipe can be used outdoors but should be coated or treated for corrosion protection, especially in environments where it may be exposed to moisture or chemicals.

What is the wall thickness of Schedule 20 carbon steel pipe?

The wall thickness of Schedule 20 carbon steel pipe ranges from 6.35 mm to 12.7 mm, depending on size and application requirements.

Read more: Schedule 40 pipe vs Schedule 80 pipe or Carbon steel pipe material and classification