Carbon steel pipe, schedule 10 (SCH 10)

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Thin-wall schedule 10 carbon steel pipe for low-pressure lines: drains, vents, condensate returns, service air and water. Dimensions per ASME B36.10-2022, 14 diameters NPS 1/2″–12″; usual supply is welded (ERW) under ASTM A53 Gr B. Not suitable for threaded joints.

CALCULATED ALLOWABLE PRESSURE · NPS 2″ AT ≤38 °C

94 bar

1,365 psi · Barlow, E=0.85 (ERW), −12.5% tolerance

FULL ALLOWABLE STRESS UP TO

149 °C

S = 137.9 MPa (20.0 ksi) · ASME B31.3-2024, Table A-1

DIAMETER RANGE

1/2″–12″

DN 15–300 · 14 published sizes

DIMENSIONAL STANDARD

ASME B36.10-2022

Welded and Seamless Wrought Steel Pipe

Important: Before using these data in engineering, design or installation decisions on systems exposed to mechanical, pressure, rupture, fatigue, impact or water-hammer risk, it is essential to read the technical notice and limitation of liability at the end of this sheet.

VT-tubo-acero-al-carbon-sch10 · carbon steel pipe, schedule 10 wall · 6 m lengths · made to order, quoted per project

1. Technical specifications

Dimensions and calculated working pressure by diameter

NPS	DN	O.D.		SCH 10 wall		Weight per linear metre		Allowable pressure at ≤38 °C¹
NPS	DN	mm	in	mm	in	kg/m	lb/ft	bar	psi
1/2″	15	21.3	0.840	2.11	0.083	1.00	0.67	203	2,940
3/4″	20	26.7	1.050	2.11	0.083	1.28	0.86	162	2,352
1″	25	33.4	1.315	2.77	0.109	2.09	1.41	170	2,466
1-1/4″	32	42.2	1.660	2.77	0.109	2.69	1.81	135	1,954
1-1/2″	40	48.3	1.900	2.77	0.109	3.11	2.09	118	1,707
2″	50	60.3	2.375	2.77	0.109	3.93	2.64	94	1,365
2-1/2″	65	73.0	2.875	3.05	0.120	5.26	3.53	86	1,242
3″	80	88.9	3.500	3.05	0.120	6.45	4.34	70	1,020
4″	100	114.3	4.500	3.05	0.120	8.36	5.62	55	793
5″	125	141.3	5.563	3.40	0.134	11.57	7.78	49	717
6″	150	168.3	6.625	3.40	0.134	13.84	9.30	41	602
8″	200	219.1	8.625	3.76	0.148	19.96	13.41	35	511
10″	250	273.1	10.750	4.19	0.165	27.78	18.67	31	457
12″	300	323.8	12.750	4.57	0.180	36.00	24.19	29	420

¹ Allowable pressure calculated with Barlow's formula (see calculations) using S = 137.9 MPa, joint factor E = 0.85 — ERW welded pipe, the usual schedule 10 supply — and −12.5% wall manufacturing tolerance. If the lot is seamless (E = 1.00), allowable pressure is 17.6% higher. Reference material: ASTM A53/A53M-24 Gr B; dimensions and weights per ASME B36.10-2022.

Joining: schedule 10 wall does not allow NPT threading: ASME B31.3-2024, Table 314.2.1, requires minimum schedule 80 for NPS ≤ 1-1/2″ and schedule 40 for 2″–6″ on threaded joints. This pipe is joined by butt welding, grooved couplings or welded flanges.

⚠ Important: this technical data sheet is a reference guide to the product's properties; it is not a quality certificate for the product you are buying. Heats vary from one another and may differ from the values stated here, or even depart from the standards. If your application requires compliance with a standard, always check the quality certificate (mill certificate) of the lot you are buying. If in doubt, ask one of our technical advisors →

2. Engineering calculations

Allowable pressure per Barlow's formula of ASME B31.3-2024 (para. 304.1.2), with effective wall after manufacturing tolerance:

t_ef = 0.875 · t_nominal P = 2 · S · E · t_ef / D

Worked example — NPS 2″ (D = 60.3 mm, t = 2.769 mm):

t_ef = 0.875 × 2.769 = 2.423 mm
P = 2 × 137.9 × 0.85 × 2.423 / 60.3 = 9.41 MPa ≈ 94 bar ≈ 1,365 psi

Values used: S = 137.9 MPa (20.0 ksi), allowable stress at ≤38 °C for A53 Gr B per ASME B31.3-2024, Table A-1 (identical series for A106 Gr B and API 5L Gr B); E = 0.85, weld joint quality factor for ERW pipe per Table A-1B. Temperature derating follows the tri-standard series: full S up to 149 °C; factors 0.995 at 204 °C, 0.95 at 260 °C and 0.835 at 371 °C — full table in FT-TC-TUB-SCH40-001.

When schedule 10: its wall (35–45% of sch 40 in most diameters) cuts weight and cost on low design-pressure lines — industrial drains, vents, gravity condensate returns, service water and low-pressure air — joined by welding or grooved couplings. For medium pressures or threaded joints, see FT-TC-TUB-SCH40-001 and FT-TC-TUB-SCH80-001.

3. Application notes

Feasibility

Made to order per project, 6 m lengths, 14 diameters NPS 1/2″–12″. Usual lot is ERW A53 Gr B; seamless available per project (improves allowable pressure by 17.6%).

Installation

Butt-weld joints (bevel per the welding procedure), grooved or flanged. Do not thread: the wall is below the ASME B31.3 Table 314.2.1 minimum. Support at closer spacing than sch 40 due to lower wall stiffness.

Design

Published calculation uses E = 0.85 (ERW) and −12.5% tolerance. In corrosive service, the corrosion allowance quickly consumes a thin wall: consider sch 40 if the required allowance is ≥ 1 mm.

4. Technical notice and limitation of liability

The pressures, dimensions, weights and other characteristics in this sheet are theoretical calculation values obtained from nominal properties published in the standards cited (ASME B36.10-2022, ASME B31.3-2024, ASTM A106/A106M-19a, ASTM A53/A53M-24, API Spec 5L 46th ed.). They guide selection; they are not a certificate of conformity for any given lot.

The actual behavior of each lot varies with manufacturing — wall tolerance (up to −12.5%), out-of-roundness, residual stresses — and with the raw material — chemical composition within the ranges the standard allows, heat-to-heat differences. To certify a lot, the tests defined by its product standard are required: tensile test, flattening test and hydrostatic test, documented in the manufacturer's mill test certificate (MTC), which TECTUL supplies upon request; testing of the lot in an independent laboratory can also be arranged.

These values must not be used as the sole criterion in critical or safety applications, or wherever failure of the line may compromise people, property or the environment: in such cases the design belongs to the project's responsible engineer under the applicable code (ASME B31.3, B31.1 or the one governing the installation), with the design temperature, corrosion allowance and load cases of the actual service. Before deciding with these data, consult our technical team.

Sources

ASME B36.10-2022 — Welded and Seamless Wrought Steel Pipe (dimensiones y pesos)
ASME B31.3-2024 — Process Piping: Tabla A-1 (S de A53/A106/API 5L Gr B), Tabla A-1B (E = 0,85 ERW), Tabla 314.2.1 (mínimos de cédula para rosca), párr. 304.1.2 (fórmula)
ASTM A53/A53M-24 — Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless
ASTM A106/A106M-19a y API Spec 5L 46.ª ed. (2018) — grados de la serie trinorma

TECTUL · FT-TC-TUB-SCH10-001 · Rev. 001 · July 22, 2026WhatsApp +573161111666