API RP 520-2 pdf download.Sizing, Selection, and Installation of Pressure-relieving Devices in ReÞneries Part II-Installation 1 Scope This recommended practice covers methods of installation for pressure-relief devices for equipment that has a maximum allowable working pressure (MAWP) of 15 psig (1.03 bar g or 103 kPA) or greater. Pressure-relief valves or rupture disks may be used independently or in combination...