| Applies To | |
| Product(s): | AutoPIPE Vessel |
| Version(s): | ALL |
| Area: | Report |
| Date Logged & Current Version | Aug 2021 41.01.01.011 |
Problem:
While calculating maximum allowable nozzle loads (Fmax) as per EN 13445-3 (2021), Why Δ, K & α are zero?
Solution:
While calculating global longitudinal compressive stress limit, As per EN 13445-3 (2021) Clause 16.14.8,
Cylinders should not be checked against longitudinal buckling if equation 16.14-15 satisfied. Refer below reference.
If equation 16.14-15criteria met, then permissible longitudinal compressive stress σc, all may be taken as design stress f of the nozzle.
Hence in this case no further calculations for Δ, K & α are zero, and σc, all is same as design stress at design temperature.
Note: AutoPIPE Vessel using fabrication tolerance quality class C and taking factor PSI (ψ) = 0,75 which is a conservative assumption for vessels that satisfy the manufacturing tolerance requirements of EN 13445-4:2019, Clause 6.