Purpose
This article clarifies how AutoPIPE Vessel calculates APs for a set-on nozzle in the longitudinal cross-section when using EN 13445-3.
Key Information
AutoPIPE Vessel uses the nozzle inside diameter for the opening compensation basis in this condition. For a set-on nozzle in the longitudinal cross-section, the implementation uses a = dib/2 rather than a = deb/2.
- dib=30.2 mm, therefore:
- a=30.2/2=15.1 mm
-
- Aps = ris (ls′ + a)
- Aps = 113.78(75.41+15.1) ≈ 10,298 mm2.
An apparent discrepancy can arise if the calculation is checked assuming a = deb/2. That interpretation is considered, but the confirmed product behavior is intentional for opening compensation in this nozzle configuration.
FAQs (if applicable)
Why does the APs value differ from a manual check based on deb/2?
AutoPIPE Vessel uses dib/2 for a set-on nozzle in the longitudinal cross-section, so a manual check based on deb/2 does not match the product result.
Is this treated as a product defect?
No. The implementation is confirmed as intentional.
What value of a reproduces the product result in the reviewed example?
Use dib = 30.2 mm, so a = 15.1 mm.
See Also