Maintenance
3. Unthread the dust cap from one end of the gas line to be checked. Be sure the valve on the
pressure gauge tool is closed before it is connected. Connect the male Aeroquip end of the
pressure gauge tool to the gas line using two wrenches.
4. Read the pressure.
4.1. If the pressure is low, but > 20 psig, use the charge adapter to add helium gas to the
gas line to reach the specified equalization pressure.
4.2. If pressure in the gas line is <20 psig, perform a clean–up on the gas line.
5. When finished checking or pressurizing the gas line, make sure the gauge tool is charged to
50 psig helium gas for storage.
6. Disconnect the male Aeroquip end of the pressure gauge tool from the gas line using two
wrenches.
7. Screw the dust cap finger tight on to the gas line coupling.
This completes the procedure for checking the charge pressure in a gas line.
Gas Cleanup and Recharging
Tools required: Adapter fittings (2) P/N SK8217A2 or 255919B2 and 257246C5.
Open-end wrenches
Cleaning and recharging are always required when a gas line has been vented and repaired or
if the gas pressure has dropped to less than 140 kPa (20 psig). Each gas line is cleaned and
charged individually using adapter fittings.
1. Locate and connect adapter fitting P/N SK8217A2 to one gas line coupling. Connect
adapter fittings P/N 255919B2 and257246C5 to the other coupling. Be sure the valve on
each adapter fitting is closed before it is connected.
Adapter fittings are available as optional accessories from SCAI.
2. Connect a charge line to the pressure regulator of a helium gas cylinder containing 99.995%
pure helium gas with a dew point less than -50º C (-58º F) at 2065 kPa (300 psig).
AVOID INJURY. Never use compressed gas from a cylinder without a proper
regulator. Overpressure can cause personal injury if the system equipment
ruptures.
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