Taylor-Wharton RS-234 - Manual (Page 11)

10
MAINTENANCE
Read the Safety Precautions in the front of this manual before attempting any repairs on these containers. Also follow
these additional safety guidelines while performing container maintenance.
Never work on a pressurized container. Open the vent valve as a standard practice during maintenance to
guard against pressure build-up from residual liquid.
Use only repair parts cleaned for oxygen service. Be certain your tools are free of oil and grease. This is a
good maintenance practice, and helps ensure you do not create a combustion hazard when working on
containers for oxygen service.
Leak test connections after every repair. Pressurize the container with an appropriate inert gas for leak
testing. Use only approved leak test solutions and follow the manufacturer's recommendations. "Snoop"
Liquid Leak Detector is one approved solution, it is available from: Nupro co. 4800 E. 345th St. Willoughby,
Ohio 44094
CAUTION:
In oxygen systems, residue of leak detector solutions can be flammable. All surfaces to which the
leak detector solutions have been applied must be adequately rinsed with potable water to remove all
traces of residue. Reference CGA G-4.4 Section 4.9.
Regulator Maintenance
Single stage, spring loaded regulators are employed in the pressure building and economizer circuits. These regulators
can be adjusted on the container, replaced, or checked and adjusted off the container in a readily fabricated bench
adjustment fixture.
Pressure Building Regulator Adjustment - On Container
1.
Fill the container with the appropriate liquid product.
2.
Open the PRESSURE BUILDING VALVE (V-5) and allow the container pressure to stabilize for about an
hour. Note the point where the pressure stabilizes.
3.
Adjust the screw on the top of the PRESSURE BUILDING REGULATOR (R-1) to raise or lower the
pressure to the desired point. When decreasing the setting, the pressure building valve must be closed and the
container vented to a lower pressure. Then repeat step 2 in order to observe the change.
Note: The range of adjustment is 50 to 150 psig (3.5 to 10.3 bar). Do not attempt to set the regulator to a pressure
outside of its design range.
Pressure Building Valve Removal or Replacement Procedure
1.
Close the ISOLATION VALVE (V-4) and the PRESSURE BUILDING VALVE (V-5).
2.
Loosen the tube connection nut on the output side of the regulator. Allow pressure to completely bleed from
the tube. Remove the tube.
3.
Remove the regulator from the container by unscrewing the valve body from the nipple at the input side.
4.
Repair the regulator and adjust its setpoint using the bench test setup.