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Regulator
Inspection Procedures
Prepared by Wayne A. Buchanan, I.E.C.
These procedures apply to regulators used in both hazardous and
non-hazardous applications.
Age
Manufacturers used to recommend reconditioning once a year. Now
they recommend that it be based on user experience.
As a general guide:
If the regulator is greater than 10 years old, purchase a new
one.
If it is 5-10 years old, weigh the cost of an equivalent new regulator
versus the reconditioning cost.
If it is less than 5 years old, base reconditioning on the type of
use. With corrosive and acid gases, they should be reconditioned yearly.
In non-corrosive applications, base the decision on use and inspection
observations as outlined below.
Inspection
Gauges should read zero when gases are drained from the
regulator. If not, they should be replaced.
Gas leaking out of the outlet when the regulator is in the closed
position is an indication of a seat failure, and the regulator should be
reconditioned or replaced.
At a given delivery pressure with the cylinder valve open and the
outlet valve closed, you should not see a rise in pressure in a 5-10
minute time period. If you do, the regulator should be reconditioned or
replaced.
Check the regulator for leaks with each cylinder change, or at least
on a monthly basis. If leakage occurs around the adjusting knob or
handle, the diaphragm could be damaged or contaminated and the regulator
should be reconditioned or replaced. Leakage around fittings or seals
should be repaired.
Excessive drop in flow from the outlet could indicate a blockage or
occlusion, and service should be performed.
For further information please review the Regulator Use Procedures for
Non-Hazardous Gases.
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