SS 316L pipe schedule chart
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What Is SS316L Pipe Schedule?
SS316L Pipe Dimensions Chart (ASME B36.19)
| NPS (Inches) | OD (Inches) | OD (mm) | Sch 5S WT (mm) | Sch 10S WT (mm) | Sch 40S (Std) WT (mm) | Sch 80S (XS) WT (mm) |
| 1/8" | 0.405 | 10.29 | - | 1.24 | 1.73 | 2.41 |
| 1/4" | 0.540 | 13.72 | - | 1.65 | 2.24 | 3.02 |
| 3/8" | 0.675 | 17.15 | - | 1.65 | 2.31 | 3.20 |
| 1/2" | 0.840 | 21.34 | 1.65 | 2.11 | 2.77 | 3.73 |
| 3/4" | 1.050 | 26.67 | 1.65 | 2.11 | 2.87 | 3.91 |
| 1" | 1.315 | 33.40 | 1.65 | 2.77 | 3.38 | 4.55 |
| 1-1/4" | 1.660 | 42.16 | 1.65 | 2.77 | 3.56 | 4.85 |
| 1-1/2" | 1.900 | 48.26 | 1.65 | 2.77 | 3.68 | 5.08 |
| 2" | 2.375 | 60.33 | 1.65 | 2.77 | 3.91 | 5.54 |
| 2-1/2" | 2.875 | 73.03 | 2.11 | 3.05 | 5.16 | 7.01 |
| 3" | 3.500 | 88.90 | 2.11 | 3.05 | 5.49 | 7.62 |
| 4" | 4.500 | 114.30 | 2.11 | 3.05 | 6.02 | 8.56 |
| 5" | 5.563 | 141.30 | 2.77 | 3.40 | 6.55 | 9.53 |
| 6" | 6.625 | 168.28 | 2.77 | 3.40 | 7.11 | 10.97 |
| 8" | 8.625 | 219.08 | 2.77 | 3.76 | 8.18 | 12.70 |
| 10" | 10.750 | 273.05 | 3.40 | 4.19 | 9.27 | 12.70 |
| 12" | 12.750 | 323.85 | 3.96 | 4.57 | 9.53 | 12.70 |
How to Choose 316L SCH10S, SCH40S or SCH80S?
What is the pressure rating for Schedule 40 316L stainless steel pipe?
Design Conditions: ASTM A312 TP316L Seamless Pipe, ASME B31.3, Design Temperature 38°C (100°F), Corrosion Allowance = 0 mm.
| NPS | Outside Diameter (OD) | Schedule | Wall Thickness | Approx. Working Pressure | Approx. Burst Pressure |
|---|---|---|---|---|---|
| 1/2" | 21.3 mm | SCH 40S | 2.77 mm | 2,300 psi (15.9 MPa) | 9,200 psi (63.4 MPa) |
| 3/4" | 26.7 mm | SCH 40S | 2.87 mm | 1,950 psi (13.4 MPa) | 7,800 psi (53.8 MPa) |
| 1" | 33.4 mm | SCH 40S | 3.38 mm | 1,750 psi (12.1 MPa) | 7,000 psi (48.3 MPa) |
| 1-1/2" | 48.3 mm | SCH 40S | 3.68 mm | 1,400 psi (9.7 MPa) | 5,600 psi (38.6 MPa) |
| 2" | 60.3 mm | SCH 40S | 3.91 mm | 1,150 psi (7.9 MPa) | 4,600 psi (31.7 MPa) |
| 3" | 88.9 mm | SCH 40S | 5.49 mm | 1,050 psi (7.2 MPa) | 4,200 psi (29.0 MPa) |
| 4" | 114.3 mm | SCH 40S | 6.02 mm | 950 psi (6.6 MPa) | 3,800 psi (26.2 MPa) |
| 6" | 168.3 mm | SCH 40S | 7.11 mm | 850 psi (5.9 MPa) | 3,400 psi (23.4 MPa) |
| 8" | 219.1 mm | SCH 40S | 8.18 mm | 780 psi (5.4 MPa) | 3,100 psi (21.4 MPa) |
Thickness Tolerance of ASTM A312 TP316L Pipe
Wall Thickness Tolerance (ASTM A312 / A999)
| NPS Range (Inches) | Manufacturing Method | Under Tolerance (%) | Over Tolerance (%) |
| 1/8" to 2-1/2" (inc.) | Seamless | -12.5% | +20.0% |
| 3" to 18" (inc.) | Seamless (t/D ratio ≤ 5%) | -12.5% | +22.5% |
| 3" to 18" (inc.) | Seamless (t/D ratio > 5%) | -12.5% | +15.0% |
| 20" and larger | Seamless (t/D ratio ≤ 5%) | -12.5% | +22.5% |
| 20" and larger | Seamless (t/D ratio > 5%) | -12.5% | +15.0% |
| All Sizes | Welded (All Grades) | -12.5% | +15.0% |
Note: t = Nominal Wall Thickness; D = Ordered Outside Diameter.
Outside Diameter (OD) Tolerance (ASTM A312)
In addition to thickness, the OD must also remain within specific limits to ensure proper fitment with flanges and valves.
| NPS Range (Inches) | Over Tolerance (mm) | Under Tolerance (mm) |
| 1/8" to 1-1/2" | +0.4 mm | -0.8 mm |
| 1-1/2" to 4" | +0.8 mm | -0.8 mm |
| 4" to 8" | +1.6 mm | -0.8 mm |
| 8" to 18" | +2.4 mm | -0.8 mm |
| 18" to 26" | +3.2 mm | -0.8 mm |
Why Does SS316L Pipe Cost More Than SS304?
SS316L pipe typically costs 15% - 30% more than SS304 because it is alloyed with molybdenum and has a higher nickel content. These raw materials are more expensive than the chromium used in SS304, and they provide drastically improved corrosion and pitting resistance in harsh or saltwater environments.
316L SCH40S vs SCH80S: Seawater Pipeline
- Location: An offshore oil and gas platform in Southeast Asia.
- Application: Secondary cooling water system (direct seawater intake for heat exchange).
- Medium: Natural seawater (characterized by high chloride levels, sand content, biological activity, and dissolved oxygen).
- Design Life: 15 years.
- Pipe Diameter Requirement: NPS 4 (DN100).
SS316L Pipe SCH 40S vs. SCH 80S: Differences
| Technical Data | SCH 40S | SCH 80S | Variance |
|---|---|---|---|
| Wall Thickness | 6.02 mm | 8.56 mm | +42.2% |
| Allowable Pressure* | ~115 bar | ~168 bar | +46.0% |
| Unit Weight | 16.32 kg/m | 22.62 kg/m | +38.6% |
| Internal Diameter (ID) | 102.26 mm | 97.18 mm | -4.9% |
| Flow Area | 8,214 mm² | 7,416 mm² | -9.7% |
| Typical Applications | Water Treatment, Food Processing, General Chemical Service | Offshore, Refinery, High-Pressure Process Lines |
- SCH 40S: It features a lower initial procurement cost, with an effective corrosion service life of approximately 8 to 10 years. Beyond 10 years, the system may face large-scale shutdowns for overhaul and replacement.
- SCH 80S: While the initial procurement cost is 40% higher, it offers a lower Life Cycle Cost (LCC) by minimizing unplanned downtime and reducing labor costs for replacement.
If the budget is extremely tight , SCH 80S can be used on the main lines, while SCH 40S can be used on the low-pressure, easily replaceable branch lines at the ends.If the seawater temperature exceeds 25°C, the risk of pitting corrosion for 316L will escalate dramatically.
Under such circumstances, merely increasing the wall thickness (from 40S to 80S) may not be sufficient, and a material upgrade to Super Duplex 2507 should be considered; even when using SCH 10S, its corrosion resistance far outperforms that of 316L SCH 80S.
Supplier of ASTM A312 TP316/316L Stainless Steel Pipe
ASTM A312 TP316/316L Stainless Steel Pipe Specification
| Item | Specification |
| Standard | ASTM A312, ASME SA312 |
| Grade | TP316, TP316L, TP316/316L Dual |
| Type | Seamless (SMLS) or Welded (ERW, EFW) |
| Size Range | 1/8" to 30" NPS |
| Schedule | Sch 5S, 10S, 40S, 80S, 160, XXS |
| Finish | Solution Annealed & Pickled (White Finish) or Bright Annealed |
| Ends | Plain End, Beveled End (for welding), or Threaded |
Inspection & Quality Control (QC)
To ensure zero-defect delivery, every pipe undergoes a series of mandatory and optional tests:
| Category | Test Items | Purpose |
| Chemical | PMI (Positive Material Identification) | Verify Cr, Ni, Mo, and C content. |
| Mechanical | Tensile, Yield, Elongation, Hardness | Ensure the pipe meets structural requirements. |
| Integrity (NDT) | Hydrostatic Test | 100% test to ensure no leaks under high pressure. |
| Integrity (NDT) | Eddy Current or Ultrasonic (UT) | Detect internal cracks, pits, or wall thinning. |
| Microstructure | Intergranular Corrosion Test (IGC) | Verify resistance to "weld decay" (Practice A/E). |
| Visual/Dim | Dimensional & Surface Check | Confirm wall thickness, OD, and smooth ID/OD finish. |
We provide a full set of documentation with every shipment to ensure traceability:
MTC (Material Test Certificate): Fully compliant with EN 10204 3.1 standards (or 3.2 standards upon request).
Professional Export Packaging
End Protection: All pipes are fitted with Plastic Caps (blue, white, or customized) to protect threads and beveled ends from impact and debris.
Surface Protection: Each pipe can be individually sleeved in a plastic bag or wrapped in hexagonal bundles with PE wrapping.
Securing: For large diameters, we use internal bracing. For small diameters, we use fumigated wooden cases or steel-framed crates to prevent bending during forklift handling.
