EN13480 - out-of-roundness
Verfasst: Mo 3. Dez 2018, 12:45
Hi
The out-of-roundness µ (see EN 13480-4, 7.4.1) for external pressure design acc. to chapter 9 must be less than or equal to 1 %, and local flat deviation is less than or equal to e. When ordering pipes (e.g. acc to EN10216-3) the tolerances for diameter are typically 1% which means an out-of-roundness of 2%. That means you can´t use a standard pipe with tolerance D2 ( +/- 1.0 %) acc. to EN ISO 1127 ! if you use the formula in chapter 9 for external pressure design.
How should we deal with this contradiction? How can we design piping against external pressure using EN13480-3?
Best regards
The out-of-roundness µ (see EN 13480-4, 7.4.1) for external pressure design acc. to chapter 9 must be less than or equal to 1 %, and local flat deviation is less than or equal to e. When ordering pipes (e.g. acc to EN10216-3) the tolerances for diameter are typically 1% which means an out-of-roundness of 2%. That means you can´t use a standard pipe with tolerance D2 ( +/- 1.0 %) acc. to EN ISO 1127 ! if you use the formula in chapter 9 for external pressure design.
How should we deal with this contradiction? How can we design piping against external pressure using EN13480-3?
Best regards