Atmospheric discharge should be limited to vapors that will not condense at the lowest temperatures encountered in that locality. Reference 3 provides detailed recommendations for the design of catch tanks, scrubbers and flares. Two or three phase flow is expected and must be considered when designing containment and treatment equipment. The discharge system should drain toward the discharge end, avoiding pockets if possible. Unavoidable pockets should be fitted with drip legs or knock-out pots.
Branches enter trunks from the top.
Formulas are presented on a separate page. The procedure first requires that a system sketch be prepared. Basic data for flow rates and physical properties are collected. A material balance for the manifold is made. Here are details.