Total Control Systems 700-LP Series, Installation, Operation & Maintenance Manual

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Page 5
Procedures for LPG Meters
Procedure for Relieving Pressure in LPG Meters
NOTE: All procedures to de-pressurize and purge an LPG tank system must be performed out-of-doors in an
open environment free from any ignition sources such as sparks, flames, or heat sources.
1. Close the belly valve of the supply tank.
2. Close the valve on the vapor return line.
3. Close the manual valve in the supply line on the inlet side of the meter. If no manual valve exists on the
inlet side, consult the system manufacturer for procedures to depressurize the system.
4. Slowly open the valve/nozzle at the end of the supply line
5. After product is bled off, close the valve/nozzle at the end of the supply line.
6. Slowly crack the fitting on top of the differential valve to relieve the product pressure in the system. Product
will drain from the meter system.
7. As product is bleeding from the differential valve, slowly reopen and close the valve/nozzle on the dis-
charge line. Repeat this step until the product stops draining from the differential valve and discharge line
valve/nozzle.
8. Leave the discharge line valve/nozzle open while working on the system.
This manual provides warnings intended to inform the owner/operator of the hazards present with this type of
equipment. Knowledge of these warnings and avoidance of potential hazards is the sole responsibility of the
owner/operator of the equipment. Neglect of that responsibility is not within the control of the manufacturer of
this equipment, and the manufacturer bears no responsibility for damages, injuries or deaths resulting from
improper or inappropriate use or servicing of the equipment.
WARNING
All internal pressures must be relieved (to zero psi) before inspection, disassembly,
or servicing of any part of this meter or metering system. Property damage and
serious injury or death from fire or explosion could result from improper use of
this equipment, or from maintenance of an improperly depressurized and
evacuated meter and metering system. Always follow all federal, state, and local
laws, ordinances, and industry codes when installing, operating, or servicing this
equipment.