Applies To
Product(s):	AutoPIPE Vessel
Version(s):	ALL
Area:	General
Date Logged & Current Version	Jan 2024 44.00.01.014

Problem:

Allowable longitudinal compressive Stress (σ_c,all) is not calculated as per EN13445-3 Clause 16.14-29, Why?

Instead, the software reports the design stress value as the allowable longitudinal compressive stress. Please clarify.

Solution:

Generally, the allowable longitudinal compressive stress (σ_c,all) is calculated in accordance with EN 13445-3 Equation 16.14-29.

However, Clause 16.14.8 states that when the condition defined by Equation 16.14-15 is satisfied, the design stress (f) may be used directly as the allowable longitudinal compressive stress (σ_c,all).

Therefore, the calculation procedure of Equation 16.14-29 is not required when Equation 16.14-15 is fulfilled.

Example:

In this case (Operating Corroded condition),

- - Mean Diameter (D) : 855.4 mm
  - Thickness (ea) : 34.7 mm
  - Modulus of elasticity (E) : 189000 MPa
  - Sigma e : 105.6 MPa

D/ea (24.65) ≤ 0.06 * E / Sigma e (107.38)

As equation 16.14-15 satisfied design stress value is taken as allowable longitudinal compressive stress.

Allowable longitudinal compressive Stress (σ c,all) is not calculated as per EN13445-3 Clause 16

Problem:

Solution: