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Seamless carbon steel pipe, schedule 40 (SCH 40)
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Seamless carbon steel pipe with schedule 40 wall thickness for fluid conduction: water, compressed air, steam, oils and gases. Supplied in 6 m lengths, 15 diameters from NPS 1/8″ to 8″. Dimensions per ASME B36.10-2022; typical supply is triple-certified API 5L / ASTM A106 Gr B / ASTM A53 Gr B.
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.
SKU VT-86935 · seamless carbon steel pipe, schedule 40 wall · 6 m lengths · price from $109,867 COP + VAT per length (Jul 2026, confirmed on quotation)
1. Technical specifications
Dimensions and calculated working pressure by diameter
| NPS | DN | OD | Wall SCH 40 | Weight per linear metre | Allowable pressure at ≤38 °C¹ | ||||
|---|---|---|---|---|---|---|---|---|---|
| mm | in | mm | in | kg/m | lb/ft | bar | psi | ||
| 1/8″ | 6 | 10.3 | 0.405 | 1.73 | 0.068 | 0.37 | 0.25 | 405 | 5,878 |
| 1/4″ | 8 | 13.7 | 0.540 | 2.24 | 0.088 | 0.63 | 0.42 | 394 | 5,722 |
| 3/8″ | 10 | 17.1 | 0.675 | 2.31 | 0.091 | 0.84 | 0.56 | 325 | 4,728 |
| 1/2″ | 15 | 21.3 | 0.840 | 2.77 | 0.109 | 1.27 | 0.85 | 313 | 4,551 |
| 3/4″ | 20 | 26.7 | 1.050 | 2.87 | 0.113 | 1.69 | 1.14 | 259 | 3,762 |
| 1″ | 25 | 33.4 | 1.315 | 3.38 | 0.133 | 2.50 | 1.68 | 244 | 3,541 |
| 1-1/4″ | 32 | 42.2 | 1.660 | 3.56 | 0.140 | 3.39 | 2.28 | 203 | 2,952 |
| 1-1/2″ | 40 | 48.3 | 1.900 | 3.68 | 0.145 | 4.05 | 2.72 | 183 | 2,666 |
| 2″ | 50 | 60.3 | 2.375 | 3.91 | 0.154 | 5.44 | 3.66 | 156 | 2,269 |
| 2-1/2″ | 65 | 73.0 | 2.875 | 5.16 | 0.203 | 8.63 | 5.80 | 170 | 2,473 |
| 3″ | 80 | 88.9 | 3.500 | 5.49 | 0.216 | 11.29 | 7.59 | 149 | 2,161 |
| 4″ | 100 | 114.3 | 4.500 | 6.02 | 0.237 | 16.07 | 10.80 | 127 | 1,843 |
| 5″ | 125 | 141.3 | 5.563 | 6.55 | 0.258 | 21.77 | 14.63 | 111 | 1,622 |
| 6″ | 150 | 168.3 | 6.625 | 7.11 | 0.280 | 28.26 | 18.99 | 101 | 1,478 |
| 8″ | 200 | 219.1 | 8.625 | 8.18 | 0.322 | 42.55 | 28.59 | 90 | 1,306 |
¹ Internal-pressure value calculated in section 2 (Barlow, S = 137.9 MPa, E = 1.00, −12.5% wall tolerance), rounded down. It is not a certified rating for any given lot: read the calculation basis and the technical notice.
General specifications
| Product | Seamless carbon steel pipe, schedule 40 wall (SCH 40) |
| Material and grade | Carbon steel. Typical supply is triple-certified API 5L / ASTM A106 Gr B / ASTM A53 Gr B; the certified grade and standard(s) of each lot are stated in its mill test certificate (MTC) and are confirmed on quotation. |
| Manufacture | Seamless (no longitudinal weld) — quality factor E = 1.00 per ASME B31.3-2024, Table A-1B |
| Ends | Plain or beveled for butt welding (ASME B16.25); confirmed on quotation. Schedule 40 wall admits NPT threading (ASME B1.20.1) in small diameters — verify remaining wall thickness (section 3). |
| Commercial length | 6 m per length |
| Finish | Black, no galvanic coating (galvanized pipe is a separate catalog item); lot surface protection is confirmed on quotation. |
| Wall tolerance | Minimum wall at any point ≥ 87.5% of nominal (−12.5%), per ASTM A530 (referenced by A106) and ASTM A53 |
| Applicable standards | ASME B36.10-2022 (dimensions) · ASTM A106/A106M-19a (seamless, high-temperature service) · ASTM A53/A53M-24 · API Spec 5L, 46th ed. (2018) · design code of reference: ASME B31.3-2024 |
Larger diameters: the catalog also offers 10″–24″ made to order; in 18″, 20″ and 24″ the supply is standard weight (SCH STD), not schedule 40 — their pressures are calculated with the STD wall and quoted per project.
⚠ 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. Calculation basis (allowable internal pressure)
Allowable internal pressure is estimated with Barlow's formula, applying the manufacturing wall tolerance. All values used are stated below — nothing is assumed silently:
| S — basic allowable stress | S = 137.9 MPa (20.0 ksi) at ≤38 °C, per ASME B31.3-2024, Table A-1, for seamless ASTM A106 Gr B and ASTM A53 Gr B (identical values for both grades, and for API 5L Gr B). Since the three usual supply standards share the same S, the ambient-temperature result does not depend on which grade the lot certifies. |
| E — quality factor | E = 1.00 for seamless pipe, per ASME B31.3-2024, Table A-1B. |
| tef — effective wall | tef = 0.875 · tnominal: the manufacturing tolerance allows the wall to be up to 12.5% under nominal at any point (ASTM A530 / A53), so the calculation uses the guaranteed minimum wall. No corrosion allowance is subtracted here (see section 3, Design). |
| D — outside diameter | Nominal OD per ASME B36.10-2022 (table in section 1). |
- Nominal wall SCH 40: t = 3.91 mm; OD: D = 60.3 mm (ASME B36.10-2022).
- Effective wall: tef = 0.875 × 3.91 = 3.421 mm.
- P = 2 × 137.9 MPa × 1.00 × 3.421 / 60.3 = 15.65 MPa ≈ 156 bar ≈ 2,269 psi.
Derived allowable pressure by diameter (≤38 °C)
| NPS | Effective wall | P (MPa) | P (bar) | P (psi) |
|---|---|---|---|---|
| 1/8″ | 1.514 mm | 40.53 | 405 | 5,878 |
| 1/4″ | 1.960 mm | 39.46 | 394 | 5,722 |
| 3/8″ | 2.021 mm | 32.60 | 325 | 4,728 |
| 1/2″ | 2.424 mm | 31.38 | 313 | 4,551 |
| 3/4″ | 2.511 mm | 25.94 | 259 | 3,762 |
| 1″ | 2.958 mm | 24.42 | 244 | 3,541 |
| 1-1/4″ | 3.115 mm | 20.36 | 203 | 2,952 |
| 1-1/2″ | 3.220 mm | 18.39 | 183 | 2,666 |
| 2″ | 3.421 mm | 15.65 | 156 | 2,269 |
| 2-1/2″ | 4.515 mm | 17.06 | 170 | 2,473 |
| 3″ | 4.804 mm | 14.90 | 149 | 2,161 |
| 4″ | 5.268 mm | 12.71 | 127 | 1,843 |
| 5″ | 5.731 mm | 11.19 | 111 | 1,622 |
| 6″ | 6.221 mm | 10.19 | 101 | 1,478 |
| 8″ | 7.158 mm | 9.01 | 90 | 1,306 |
Temperature derating — S(T) per ASME B31.3-2024, Table A-1
The allowable stress S — and with it the allowable pressure, proportionally — decreases with service temperature. Verified values for seamless A53 Gr B / A106 Gr B (identical series for both grades):
| Temperature | S | Factor vs. 38 °C | ||
|---|---|---|---|---|
| °C | °F | MPa | ksi | |
| ≤38 °C | 100 °F | 137.9 | 20.0 | 1.000 |
| 93 °C | 200 °F | 137.9 | 20.0 | 1.000 |
| 149 °C | 300 °F | 137.9 | 20.0 | 1.000 |
| 204 °C | 400 °F | 137.2 | 19.9 | 0.995 |
| 260 °C | 500 °F | 131.0 | 19.0 | 0.950 |
| 316 °C | 600 °F | 123.4 | 17.9 | 0.895 |
| 343 °C | 650 °F | 119.3 | 17.3 | 0.865 |
| 371 °C | 700 °F | 115.1 | 16.7 | 0.835 |
Above 371 °C the allowable stress falls steeply (creep range): consult ASME B31.3-2024, Table A-1, and specify ASTM A106 Gr B, whose scope is high-temperature service. The design temperature and code edition of the project govern.
3. Application notes
Feasibility
In the range of this sheet (NPS 1/8″–8″) the STD designation coincides with SCH 40 (ASME B36.10-2022), which makes it the base schedule for general conduction. For reference at NPS 2″: SCH 10 wall is 2.77 mm, SCH 40 is 3.91 mm and SCH 80 is 5.54 mm — if the calculated pressure of section 2 is insufficient for your line, evaluate SCH 80; for low-pressure lines, SCH 10 may suffice.
Installation
Butt welding with beveled ends (ASME B16.25) mates with SCH 40 fittings of the same diameter (elbows, tees, reducers ASTM A234 WPB). NPT threading (ASME B1.20.1) removes wall: verify that the remaining thickness under the thread withstands the line pressure — the values in this sheet are for full wall. Support the line with clamps or supports selected per MSS SP-69. Thread sealing per the system specification.
Design
The safety margin is built into S: for these grades S = 137.9 MPa equals one third of the specified minimum tensile strength (415 MPa / 60 ksi). The calculation covers internal pressure only: the design code (e.g. ASME B31.3-2024) also considers combined loads, water hammer, vibration and fatigue. For corrosive service subtract a corrosion allowance c from the effective wall: with c = 1.5 mm at NPS 2″, tef = 3.421 − 1.5 = 1.921 mm and P drops to 87 bar.
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, Tablas A-1 y A-1B (S admisible y factor E)
- ASTM A106/A106M-19a — Seamless Carbon Steel Pipe for High-Temperature Service
- ASTM A53/A53M-24 — Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless
- API Spec 5L, 46th ed. (2018) — Line Pipe
- ASTM A530/A530M — tolerancia de espesor −12,5% (referida por A106)