Page 87 - Applied Process Design for Chemical and Petrochemical Plants Volume I

74 Applied Process Design for Chemical and Petrochemical Plants

(table 2-2 continued from previous page)

GATE VALVES SWING CHECK VALVES
Wedge Disc, Double Disc, or Plug Type

K=ImfT K = 5o.f~
If: fl- I, 8 = 0.. . . . . . . . . . . . .Ki = 8f~ Minimum pipe velocity Minimum pipe velocity
< I and 8 7 45'. . . . . . . . .K2 - Formula 5 (fps) for full disc lift (fps) for full disc lift
fl< I and8>45O? 180 "... Kz-Formula6 = 35 G = 48 fl

LIFT CHECK VALVES
GLOBE AND ANGLE VALVES

If: B- I...Kl=bfT
B < I.. .K2 Formula 7
Minimum pipe velocity (fps) for full disc lift
-40 pfl

If: fl-I ... K1=55fT
j3< 1...K~=Formula7
Minimum pipe velocity (fps) for full disc lift
= 140
E!qE

TILTING DISC CHECK VALVES

All globe and angle valves, Sizes 16 to 48'. . .K =
whether reduced seat or throttled, Minimum pipe velocity
If: B < I. . . Kt = Formula 7