Iso 4126-9 Pdf -

: The installation must be designed so that the maximum allowable accumulated pressure is never exceeded. Sizing must account for actual operating temperatures and back pressure in the discharge lines.

The primary goal of ISO 4126-9 is to ensure that a safety system acts as the for pressure equipment. It assumes that the fluid being discharged is in a single-phase flow (either pure liquid or pure gas); if you are dealing with two-phase flow (gas/liquid mixtures), you must refer to ISO 4126-10 for specific guidance. What is Covered? Iso 4126-9 Pdf

: Valves where the main relief device is controlled by a self-actuated auxiliary device. : The installation must be designed so that