cashco SLR-2 Manual de instalación, uso y mantenimiento - Página 13

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cashco SLR-2 Manual de instalación, uso y mantenimiento
IX. TROUBLE SHOOTING GUIDE
When trouble shooting this regulator there are many possibilities as to what may be causing problems. Many times, the regu-
lator itself is not defective, but one or more of the accessories may be. Sometimes the pro cess may be causing difficulties.
The key to efficient 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 fluid properties)
• Range of flow rate
• Range of inlet pressure
Pressure readings should be taken at every location where 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.
Following are some of the more common complaints along with possible causes and remedies.
1. Erratic regulation, instability or hunting.
Possible Causes
A.
Sticking of internal parts.
B.
Load changes are too quick for system.
C.
Oversized regulator.
D.
Too much variation in Inlet Pressure - P1.
2.
Erratic regulation, instability or hunting (liquid service).
Possible Causes
A.
Air trapped under diaphragm.
3.
Downstream pressure will not reach desired setting.
Possible Causes
A.
Supply pressure is down (confirm on pressure
gauge.
B.
Undersized regulator.
C.
Pressure loading system pressure restricted.
D.
Faulty loading pressure control device.
4.
Diaphragm continually breaks (all regulators).
Possible Causes
A.
Differential pressure across diaphragm may
have exceeded limits. (See Table 6 in SLR-2-
TB)
5.
Leakage at diaphragm flange.
Possible Causes
A.
Body bolts not torqued properly.
B.
Pressures at diaphragm may be too high.
IOM-SLR-2
SECTION IX
• Range of outlet pressure
• Range of fluid temperature
• Range of ambient temperature
A.
Remove internals, clean, and if necessary, replace.
B.
Convert to external sensing (if necessary) and install an orifice or
needle valve in external sensing line.
C.
Check actual flow conditions; resize regulator for min i mum and maxi-
mum flow; if necessary, replace with smaller regulator.
D.
Consider use of a pilot for closer Outlet Pressure – P2
A.
Install valve on external sensing port and bleed off air. (Install
regulator upside down to help prevent reoccurrence.
A.
Increase supply pressure.
B.
Check actual flow conditions; resize regulator for min i mum and maxi-
mum flow; if necessary, replace with larger regulator.
C1. Clean restriction or bleed orifices.
C2. Clean filter(s).
C3. Clean loading pressure control device.
D.
Replace/repair loading pressure control device.
A1. Be aware of limits as well as where the various pressures are acting.
Install pressure safety equipment as necessary.
A.
Torque to proper value (see Section VII, F-10).
B.
Consult factory.
Remedies
Remedies
Remedies
Remedies
Remedies
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