Cashco SAP - Manual (Page 7)

IOM-SAP 7
SECTION VIII
VIII. TROUBLE SHOOTING GUIDE
When trouble shooting this regulator there are many possibilities as to what may be causing problems. Many
times, the regulator itself is not defective, but one or more of the accessories may be. Sometimes the pro cess
may be causing diffi culties.
The key to effi cient trouble shooting is information and communication. The customer should try to be as precise
as possible in their explanation of the problem, as well as their understanding of the application and operating
con di tions.
It is imperative the following information be provided by the customer:
Fluid (with fl uid properties)
Range of fl ow rate
Range of inlet pressure
Range of outlet pressure
Range of fl uid temperature
Range of ambient temperature
Pressure readings should be taken at every location that pressure plays a role - i.e., regulator inlet (as close as
possible to inlet port), regulator outlet (as close as possible to outlet port), etc.
Below are some of the more common complaints along with possible causes and remedies.
Possible Causes Remedies
A. Sticking of internal parts A. Remove internals, clean, and if necessary, replace.
B. Oversized regulator B. Check actual fl ow conditions; resize regulator for min i mum
and maximum fl ow; if necessary, replace with smaller
regulator.
1. Erratic regulation, instability or hunting.
Possible Causes Remedies
A. Supply pressure is down (confi irm
on pressure gauge). A. Increase supply pressure
B. Undersized regulator. B. Check actual fl ow conditions; resize regulator for minimum
and maximum fl ow; if necessary, replace with larger regulator.
2. Downstream pressure will not reach desired setting.
Possible Causes Remedies
A. Body bolts not torqued properly. A1. Torque to proper value (see Section VII, C. 11.)
A2. Failed C-ring seal. Replace seal.
B. Pressures may be too
high for regulator design. B. Consult factory.
3. Leakage at fl ange.