Formed in 1976, the Design Institute for Emergency Relief Systems (DIERS) was a
consortium of 29 companies that developed methods for the design of emergency
relief systems to handle runaway reactions. DIERS spent $1.6 million to
investigate the two-phase vapor-liquid onset / disengagement dynamics and the
hydrodynamics of emergency relief systems. Of particular interest to DIERS were
the prediction of two-phase flow venting and the applicability of various
sizing methods for two-phase vapor-liquid flashing flow. DIERS became a users
group in 1985.
Presently, 250 companies (75 percent domestic and 25 percent international)
participate in the DIERS Users Group to cooperatively assimilate, implement,
maintain and upgrade the DIERS methodology. The group’s purpose is...