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The LPG Storage Tank is provided with a pump well for installing a submersible pump.The pump well is designed in such a way that it can be isolated from the storage tank in case the cover flange is removed and the tank is filled with LPG.
Each LPG storage tank is provided with the following valves and fittings in addition to those for LPG compound:
a) shut-off valve with closing mechanism and excess flow valve for pump well inlet;
b) shut-off valve and excess flow valve for pump bypass and dispenser return;and
c) vapour balance valve between the pump well and storage tank complete with closing mechanism.
The Lpg Pump of appropriate design to meet the operating characteristics of the filling system and suitable for Zone application is installed in the pump well of the LPG storage tank so as to reduce the amount of space required,the chance of tampering and impact by vehicles.
A by-pass valve is installed in the by-pass line immediately after the discharge valve of submersible pump to control and maintain the differential pressure generated by the pump.The discharge is piped back to the LPG storage tank at a pre-determined pressure selected in relation with the pump curve. The function of the by-pass line is to prevent excessive pressure and overheat of the pump.
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