what is ASTM A269 Pipe Pressure Ratings?
ASTM A269 pressure ratings are not single values but depend on the specific properties of the pipe material, such as material grade (e.g., 304L, 316), wall thickness, and outer diameter. The maximum permissible working pressure is calculated using the formula P = 2St/D, where St is the permissible stress (e.g., 20,000 psi for many grades at room temperature), t is the minimum wall thickness, and D is the outer diameter. For example, a typical rated pressure for 304L stainless steel pipe with an outer diameter of 3/4 inch and a wall thickness of 0.049 inches is 2450 psi, with a temperature range of -20 to 100 °F.
Pressure Calculation Method
The permissible working pressure of ASTM A269 pipes is typically calculated based on the following parameters:
Allowable stress (S value): In the temperature range of -20°F to 100°F (-28°C to 37°C), the allowable stress is typically taken as 20,000 psi (137.8 MPa).
Safety factor: A safety factor of 4:1 is typically used, meaning the working pressure is 25% of the theoretical burst pressure.
Calculation formula: The working pressure is typically calculated based on Barlow's Formula:
Where:
P is the permissible working pressure (psig)
S is the allowable stress (psi)
t is the minimum wall thickness (in)
D is the outer diameter of the pipe (in)
ASTM A269 Pressure Rating Chart
| Outside Diameter (OD) | Wall Thickness (WT) | Working Pressure (PSI) | Burst Pressure (Theoretical PSI) |
| 1/4" (6.35mm) | 0.035" (0.89mm) | 5,100 | 20,400 |
| 1/4" (6.35mm) | 0.049" (1.24mm) | 7,500 | 30,000 |
| 3/8" (9.53mm) | 0.035" (0.89mm) | 3,300 | 13,200 |
| 3/8" (9.53mm) | 0.049" (1.24mm) | 4,800 | 19,200 |
| 1/2" (12.70mm) | 0.049" (1.24mm) | 3,500 | 14,000 |
| 1/2" (12.70mm) | 0.065" (1.65mm) | 4,700 | 18,800 |
| 3/4" (19.05mm) | 0.065" (1.65mm) | 3,000 | 12,000 |
| 1" (25.40mm) | 0.065" (1.65mm) | 2,200 | 8,800 |
| 1" (25.40mm) | 0.083" (2.11mm) | 2,900 | 11,600 |
ASTM A269 Tube Chemical Composition
| Stainless Steel Coil Tube | C | Mn | P | S | Si | Mo | Ni |
|---|---|---|---|---|---|---|---|
| TP316L | 0.035 | 2 | 0.045 | 0.03 | 1 | 2.0-3.0 | 10.0-14.0 |
| TP304 | 0.08 | 2 | 0.045 | 0.03 | 1 | - | 8.0-11.0 |
| TP316 | 0.08 | 2 | 0.045 | 0.03 | 1 | 2.0-3.0 | 11.0-14.0 |
| TP304L | 0.035 | 2 | 0.045 | 0.03 | 1 | - | 8.0-13.0 |
What is the yield strength of ASTM A269?
The yield strength specified in ASTM A269 varies depending on the specific grade. Common grades such as TP304 and TP316 have a minimum yield strength of 30 ksi (205 MPa), while TP304L and TP316L have a minimum yield strength of 25 ksi (170 MPa). ASTM A269 is the standard for stainless steel tubing, therefore its exact yield strength depends on the material composition and heat treatment process.
| Material | Tensile Strength | Yield Strength | Elongation %, Min |
|---|---|---|---|
| Ksi (MPa), Min. | Ksi (MPa), Min. | ||
| TP316 | 75(515) | 30(205) | 35 |
| TP304L | 70(485) | 25(170) | 35 |
| TP316L | 70(485) | 25(170) | 35 |
| TP304 | 75(515) | 30(205) | 35 |
ASME SA269 SS Heater Tubes Weight Chart
| Weight /m (kg/m) | Size (OD * W.T) |
|---|---|
| 3.94 | 50.8 mm * 3 mm |
| 2.21 | 38.1 mm * 2 mm |
| 0.77 | 19 mm * 1 mm |
| 1.37 | 25.4 mm * 1.5 mm |
| 0.103 | 6.35 mm * 0.25 mm |
| 0.32 | 12.7 mm * 0.5 mm |
| 0.27 | 10 mm * 0.5 mm |
| 0.53 | 15.88 mm * 0.75 mm |
ASTM A269 Tolerances
| Tolerance% | NPS | |
|---|---|---|
| – | + | |
| 12.5 | 15.0 | 3~18,t/D>5% |
| 12.5 | 17.5 | ≥ 20,welded |
| 12.5 | 20.0 | 1/8-2 1 /2 |
| 12.5 | 22.5 | 3~18,t/D≤ 5% |
| 12.5 | 15.0 | ≥ 20,smls,t/D>5% |
| 12.5 | 22.5 | ≥ 20,smls,t/D≤ 5% |
ASTM A269 seamless Tube Heat Treatment
| Material | HeatTreatment | Temperure º F(º C) |
|---|---|---|
| A269 316L | Solution | 1900(1040) |
| A269 304 | Solution | 1900 (1040) |
| A269 304L | Solution | 1900 (1040) |
| A269 316 | Solution | 1900(1040) |
What is the difference between ASTM A269 and ASTM A213 pressure rating ?
A269 is for "General Service" (Fluid lines, instrumentation).
A213 is for "Boilers and Heat Exchangers."
A213 undergoes more rigorous mechanical testing (hardness, flattening, flaring) to ensure safety in high-heat pressure environments. However, for many industrial fluid applications, their pressure capabilities are virtually identical.
When ordering ASTM A269 for pressure applications, always specify:
Seamless vs. Welded (Seamless for highest safety).
Surface Finish (Bright Annealed is best for corrosion resistance and fitting compatibility).
Tolerance Requirements (Ensure it meets the tight tolerances required for your specific fittings).
If you have project requirements for ASTM A269 stainless steel pipes, please feel free to place an order. GNEE has a large inventory of best-selling products for your selection. They can be processed into various practical product forms, including seamless and welded, and offer a variety of surface treatments. For detailed chemical composition and free samples, please contact our factory immediately. We offer competitive prices and excellent service.
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