Warning – Gasboy Atlas Start-up User Manual
Page 179
MDE-4334D Atlas™ Start-up and Service Manual · July 2013
Page 6-59
Pumping Unit
Hydraulic/Mechanical Components
General XU2A Service Procedures
To perform general XU2A service, proceed as follows:
Start-up Procedure
Note: If problems occur during start-up, refer to
on
.
1
Start the motor. Priming must occur within one minute.
2
Check the vacuum and pressure gauges to ensure that the system is operating within the
expected parameters. Record gauge readings for future reference.
3
Inspect the piping, fittings, and associated system equipment for leaks, noise, vibration and
overheating.
4
Incorrect settings of the PRV can cause system component failure, personal injury
and property damage.
WARNING
If possible, check the flow rate to ensure that the pump is operating within the expected
parameters. Record the flow rate.
5
Check the pressure setting of the PRV by momentarily closing a valve in the discharge line and
reading the pressure gauge. This pressure must be 10-20 psi (69-138 kPa) higher than the
maximum system operating pressure, or the external bypass valve setting (if equipped). Do not
operate the pump against a closed discharge valve for more than a minute.
Draining Pump
To drain the pump, run the pump with the discharge valve open and intake valve closed.
Bleed air into the pump through the intake gauge plug hole or through a larger auxiliary fitting
in the intake piping. Pump air in 30 second intervals to clean out most of the pumpage.
Note: Some residual fluid will remain in the pump and piping.
Pump Relief Valve
Note: The pump internal relief valve is designed to protect the pump from excessive pressure
and must not be used as a system PCV.
Pumping volatile liquids under suction lift may cause cavitation. Partial closing of the
discharge valve will result in internal relief valve chatter and is not recommended. For these
applications, install an external system PCV and required bypass piping back to the storage
tank.
A system PCV is also recommended while operating for extended periods (more than a
minute) against a closed discharge valve.