Cashco 964 - Manual (Page 12)

IOM-964 12
Possible Causes Remedies
A. Over-temperature. A1.
A2. Bring process temperature to 450°F (232°C) or less.
Remove in su la tion along bonnet; al low di rect con tact
with ambient air.
B. Misalignment. B. Realign body - stem - actuator.
C. Wear. C1.
C2. Remove dirt/grit from fl uid.
Reduce cyclic travel.
D. Improper design for applied service. D1. Install alternate packing design.
5. Premature packing leakage.
Possible Causes Remedies
A. Improper bonnet bolting draw down. A1. Replace gasket and draw down bolting evenly in a
cross-pattern.
6. Bonnet gasket leaking.
Possible Causes Remedies
A. Over-tightening fl ange bolting. A1.
A2.
Loosen bolting, replace gasket, reinstall new fl ange
bolting.
Replace warped fl ang es.
B. Improper pipe supports and anchors. B. Provide piping anchors and guides at control valve sta-
tion. Restrain bending movements.
7. Body fl ange leakage.