Schedule 80 seamless steel pipe

Schedule 80 seamless pipe meaning

Schedule 80 (abbreviated as SCH 80) is a grade in the American standard steel pipe wall thickness rating system, meaning "80-gauge wall thickness series," commonly known as Extra Strong (XS, thicker type)—when NPS ≤ 8″, SCH 80 and XS have the exact same wall thickness.

Seamless (SMLS) refers to pipes without longitudinal welds, made from round billets through piercing and hot rolling (or cold drawing). Compared to ERW (resistance welded) pipes of the same specifications, seamless pipes have higher reliability in high and low temperatures, high pressures, alternating loads, and corrosive environments.

ASTM schedule 80 seamless carbon steel pipe characteristic:

High pressure resistance, high precision, cold bending deformation, no crack flattening, no oxide scale, good tensile and impact resistance.

Difference Between SCH 40 pipe and SCH 80 pipe

Pipes with Schedule 40 come with standard weight, and pipes with schedule 80 come with extra strength. The materials used for making Schedule 40 and Schedule 80 come from the same material.
Schedule 80 pipes have a thicker wall than Schedule 40 pipes. As such, Schedule 80 pipes are stronger than Schedule 40 pipes. Though both pipes are used in construction work, Schedule 40 is used more often. But if a stronger pipe was needed, then the engineers would go for Schedule 80 pipes. Schedule 80 pipes are used where the pipes have to be exposed. But if there is no need for any extra strength, Schedule 40 pipes are sufficient.

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

Standard Schedule 80 Steel Pipe Dimensions Chart

NPS	OD	Wall Thickness	ID	Weight
1″	33.4 mm	4.55 mm	24.30 mm	3.24 kg/m
2″	60.3 mm	5.54 mm	49.22 mm	7.48 kg/m
4″	114.3 mm	8.56 mm	97.18 mm	22.32 kg/m
6″	168.3 mm	10.97 mm	146.36 mm	42.56 kg/m
8″	219.1 mm	12.70 mm	193.70 mm	64.64 kg/m

Schedule 80 Seamless Steel Pipe (SMLS ASTM A106 Gr.B) Dimensions and Buying Guide

When procuring or designing Schedule 80 Seamless (SMLS) steel pipes (ASTM A106 Gr.B), several key factors must be carefully considered. First, always clearly specify “seamless pipe” in the inquiry to avoid receiving ERW welded pipe by mistake. Second, remember that Nominal Pipe Size (NPS) is not equal to outside diameter (OD); for example, NPS 2″ has an actual OD of 60.3 mm, which must be used for structural design such as supports, insulation, and wall penetration sleeves. Third, end connections such as beveled ends, threaded & coupled, or socket weld can affect internal diameter and flow calculations, so allowances should be included. In addition, using Schedule 80 for large-diameter pipes is not always cost-effective, and material selection should be optimized based on actual operating conditions. Finally, dimensional tolerances for OD and wall thickness (as per ASTM standards, e.g., up to −12.5%) must be verified, and critical projects should require a Mill Test Report (MTR) to ensure compliance and safety.

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Schedule 80 Seamless Pipe Dimensions Chart

Schedule 80 seamless pipe meaning

ASTM schedule 80 seamless carbon steel pipe characteristic:

Difference Between SCH 40 pipe and SCH 80 pipe

Schedule 80 steel pipe dimensions in mm

Schedule 80 Seamless Steel Pipe (SMLS ASTM A106 Gr.B) Dimensions and Buying Guide