Home > Product > Ferrule Fittings > Technical Resources > Ferrule Fittings Pressure Ratings
Perfect Engineers, through its precision-engineered brand PE-LOCK, provides ferrule fittings capable of handling up to 10,000 PSI of pressure in gas, liquid, and steam systems. This page offers verified pressure rating data across tube sizes, materials, and temperature ranges, helping engineers select the right fitting for their critical process line or instrumentation application.
Our pressure data is based on international testing standards, factoring in material yield strength, tube wall thickness, connection geometry, and application-specific temperature.
The working pressure of a compression ferrule fitting is determined by:.
| Tube OD (in) | Wall (in) | SS316L | Duplex SS | Inconel 625 | Monel 400 |
|---|---|---|---|---|---|
| 1/8” | 0.030” | 6,000 PSI | 8,500 PSI | 10,000 PSI | 6,000 PSI |
| 1/4” | 0.049” | 6,000 PSI | 9,000 PSI | 10,000 PSI | 6,000 PSI |
| 3/8” | 0.065” | 5,000 PSI | 7,500 PSI | 9,000 PSI | 5,000 PSI |
| 1/2” | 0.083” | 4,800 PSI | 7,200 PSI | 8,500 PSI | 4,500 PSI |
| 3/4” | 0.095” | 3,500 PSI | 5,200 PSI | 7,500 PSI | 3,200 PSI |
| 1” | 0.109” | 3,000 PSI | 4,800 PSI | 6,500 PSI | 2,800 PSI |
Values shown are for standard annealed tubing, at ambient temperature (≤ 37°C). For elevated temperatures, apply temperature de-rating.
| Material | Temp (°C) | Multiply Working Pressure by: |
|---|---|---|
| SS316/316L | 100°C | 0.97 |
| SS316/316L | 200°C | 0.85 |
| SS316/316L | 400°C | 0.72 |
| Inconel 625 | 400°C | 0.88 |
| Hastelloy C276 | 300°C | 0.80 |
| Monel 400 | 200°C | 0.75 |
| Duplex SS | 250°C | 0.90 |
Always factor in temperature de-rating for steam, reactor, and high-temp gas lines
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To calculate allowable working pressure for non-standard sizes or materials:
Formula (simplified for ferrule use):
P = (2 * S * t) / D
Where:
P = Max working pressure
S = Allowable stress of material (MPa)
t = Wall thickness (mm)
D = Outside diameter (mm)
Yes. Our helium leak-tested fittings are suitable for compressed gases, including O₂ and H₂.
Use our temperature factor table above. For example, SS316L at 400°C = 72% of its rated pressure.
Yes. We provide hydro test, helium leak test, and pressure validation reports on request.
Yes. PE-LOCK fittings follow ASME, ASTM, and DIN codes as per application needs.
Yes. Contact us with alloy and tube specs to receive application-specific pressure data.
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