Guideline E-02
The 1,1•PS restriction does not apply to fire. Reason:The requirement in Annex I section 2.12 for external fire refers to damage limitation, and does not serve the purpose of pressure limiting device in normal operation.
Guideline E-09
No. The duration corresponds to the time needed to reduce the pressure below PS. It depends on the dynamics of transient pressure surges that can be highly variable from one equipment to another. The pressure limiting device shall have appropriate characteristics (flow capacity, set pressure in relation to PS, etc) to relieve the pressure safely.