Alleima online pressure calculation are tools that provides estimates of the Alleima grades.
The result of each calculation is presented as an approximate maximum working pressure.
Due to the differences in national regulations, calculations of this type differ from country to country, and many limitations exist. We have, therefore, chosen to present the following standards:
- American standard (ASME B31.3 2018)1)
- European standard (EN 13480-3 : 2012 Issue 1)2)
We also present German standard (DIN 2413 2011-06)3) and former Swedish standard (RN 78) for reference purposes.
1) Maximum internal pressure is provided in ksi. (1 ksi = 6.895 MPa)
2) Maximum internal pressure is provided in bar. (1 bar = 0.1 MPa)
3) See more information regarding the validity of DIN 2413 (2011-06) for dimensioning of hydraulic systems.
Attention regarding the validity of DIN 2413 (PDF, 83 kB)
The proof strength up to 400°C (752°F)1) is provided for each grade.
There are two separate wall thickness tolerances for each standard:
- Wall thickness tolerance ±12.5%, T22). This tolerance covers most pipe sizes according to ANSI/ASME SA312 with tolerances according to A999 (A530).
- Wall thickness tolerance ±10% T33). This tolerance is valid for all small diameter tubing(<19 mm) and most cold finished tubes.
Pay attention to the wall thickness limitations for the special grades.
Please note: The pressures suggested are only given as guidance. Dimensioning of piping systems is also dependent on external forces, thermal stress, static weight etc. Furthermore, the design must be made according to regulations from local authorities and be approved accordingly.
To find a full explanation for which a particular wall thickness tolerance is valid, please consult our stock standard catalogue S-110.
1) Above 400°C (752°F) creep strength may have to be considered.
2) The calculations are based on ±12.5% only, despite the complete T2 definition "±12.5%, but min. ±0,4 mm".
3) The calculations are based on ±10% only, despite the complete T3 definition "±12.5%, but min. ±0,2 mm".
| Condition | Outside diameter | Wall thickness |
|---|---|---|
| Cold-worked tube | ±0.75%, but min. ±0.3 mm (D3) |
±10%, but min. ±0.2 mm (T3) |
| Hot-worked tube | ±1.0%, but min. ±0.5 mm (D2) |
±12.5%, but min. ±0.4 mm (T2)3) |
4) Valid for wall thicknesses min. 4 mm and where the ratio between wall thickness and outside diameter is min. 1:10. The tolerance for other sizes is ±15%, but min. ±0.6 mm (T1).