See API 520 Part II helps the design guide for venting two safety relief valves into one common vent pipe.. The title is Sizing, Selection, and Installation of Pressure-Relieving Devices in Refineries Part II—Installation I think that the current edition is API RECOMMENDED PRACTICE 520 FIFTH EDITION, AUGUST 2003. Also want to look at API RP-521, GUIDE FOR PRESSURE-RELIEVING AND DEPRESSURING SYSTEM. Refer to their sections 4 and 5 covering disposal systems (atmospheric, flare, etc.) Another good all-around reference for relief systems is "Guidelines for Pressure Relief and Effluent Handling Systems" which is an AICHE, CCPS publication.And RP 520, RP 521, API Standard 526, 527 & 2000.

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