PRIOR VERSION :

(2) f. Figure 2 is a revised drawing of the same process, showing several improvements. Compare it to the prior version, and explain the reasons for all changes. 1 LAS FC 2 FC-1 Further processes (6) Ic NO One-way valve ND Manualy operated isolation valve Storage tank Manualy operated Isolation valve Centrifugal pump Key NO = romaly open fo=fai open on loss of instrument air fc = fail closed on loss of instrument ar Figure 2 Revised drawing of the process fo FC Further processes NO One-way valve NO Manually operated isolation valve Storage tank Manually operated isolation valve Centrifugal pump Key NO - normally open fo=fail open on loss of instrumentair