If you need a quick estimate of allowable internal pressure for stainless tubing, this Alleima-style pressure calculator gives a practical starting point. Enter tube dimensions, select a material grade, and the tool calculates estimated maximum allowable working pressure (MAWP) and burst pressure using a thin-wall pressure relationship commonly used for preliminary design checks.
Tube Pressure Calculator
Estimate MAWP and burst pressure for seamless stainless tube.
Formula used: P = (2 × S × t × E) / (D − t). Working pressure applies design factor; burst uses UTS with no design factor.
How this Alleima pressure calculator works
This tool estimates internal pressure in straight tube using a standard engineering relationship for cylindrical pressure boundaries. It is useful for screening tube options before detailed mechanical design or code validation.
What the calculator outputs
- Estimated MAWP based on yield strength and your selected safety factor.
- Estimated burst pressure based on ultimate tensile strength (no additional safety factor).
- Effective wall thickness after corrosion allowance.
Inputs explained
1) Tube geometry
Outside diameter (OD) and wall thickness are the core geometric inputs. A higher wall-to-diameter ratio generally increases pressure capability.
2) Material strength
The calculator starts with typical values for common Alleima stainless grades (such as 316L, 2205, and 2507). If your mill certificate or design temperature values differ, simply overwrite the defaults.
3) Corrosion allowance
Corrosion allowance reduces effective wall thickness. Even small allowances can materially lower pressure rating in thin-wall tubing.
4) Joint efficiency
For seamless tube, efficiency is often taken as 1.0. Welded components may use lower values depending on code and inspection quality.
5) Safety factor
Design factor reduces calculated pressure to a conservative working level. Choose this according to your project code, service criticality, and company standards.
Example calculation workflow
- Select metric units.
- Choose Alleima SAF 2205.
- Enter OD = 25 mm, wall = 2 mm.
- Set corrosion allowance = 0.2 mm.
- Set efficiency E = 1.0 and safety factor = 1.5.
- Click Calculate Pressure to get MAWP and burst estimates.
Important limitations
- This is a preliminary estimator, not a code-stamped design package.
- It does not automatically handle all code rules from ASME, EN, or PED.
- No fatigue, bending load, vibration, thermal cycling, or stress concentration checks are included.
- Always verify with project-specific standards, design temperature data, and qualified engineering review.
Best practices before finalizing tube pressure ratings
- Confirm actual certified material strengths from MTR/EN 10204 documentation.
- Use minimum guaranteed properties when required by code.
- Check temperature derating and corrosion/erosion margins.
- Validate fittings, bends, and connections—not just straight tube.
- Document assumptions in your design record.