November 2021
Installation, Operation and Maintenance Manual
DOC.IOM.RG.US Rev. 11
12
Section 7: Scheduled Maintenance and Operational Testing
Scheduled Maintenance and Operational Testing
Section 7: Scheduled Maintenance and
Operational Testing
A program of scheduled maintenance and operational testing of the operator by a trained technician
is recommended.
NOTE:
De-pressurize operator before attempting to service power gas and pilot gas filter/strainer, draw
contamination from the tanks, or check tank fluid level.
The following test and maintenance procedure should be performed at least once per year.
1.
Drain accumulated moisture and contaminants from gas filter/strainer, refer to Figure 15.
The two filter/strainer elements can be removed from the manifold body without removing
any other component or assembly including tube fittings and tubing runs. Small pipe and
flush plugs do not need to be removed for filter maintenance.
a.
Before replacing or cleaning the filter/strainer elements ensure the power gas is
blocked and or vented to atmosphere.
b.
The two filter/strainer elements items (3) and (4) can be easily replaced by
removing the two hex head end caps item (5). The hex caps can be removed
using conventional tools such as 1-7/16 inch socket wrench or standard
adjustable wrench.
c.
Carefully remove the filter/strainer elements items (3) and (4) including the
strainer seals item (2) from the manifold body item (1).
Note:
item (3) element is 25 microns, item (4) is 140 microns. Item (4) (140
microns) is the inlet high pressure power gas filter, item (3) (25 microns) is the
high pressure instrument gas filter and is used to protect the instrument regulator
inlet gas to the regulator and all downstream elements from the regulator such as
solenoid and pilot valves if applicable.
d.
The strainer/filters elements can be replaced at this time or cleaned using conventional
solvents that are typically used to clean hydrocarbon wetted components.
Note:
the strainer/filter elements are constructed from two parts; the outer stainless
steel shell with multiple perforated holes, and the inner stainless-steel mesh screen
with the screen formatted for either 25 or 140 microns. Both parts can be cleaned
with the same solvent. Be sure to carefully remove any solid particulates from the
inner mesh screen before re-installing into outer shell of the filter/strainers.
