Patent ID: 9638374
Date: 2017-05-02
CPC Classifications: F17C

Claim:
1. An LNG dispenser comprising: a supply line through which LNG is supplied from a natural gas farm to a vehicle tank; a mass flow meter provided for measuring a mass of LNG flowing through said supply line; a recirculation line branching from said supply line downstream of said mass flow meter for recirculating LNG from said supply line back to the natural gas farm; a recirculation valve located in said recirculation line for controlling a flow of LNG through said recirculation line; and a controller for controlling said recirculation valve, wherein said controller verifies integrity of said recirculation valve by closing said recirculation valve and monitoring the mass of the LNG flowing through said mass flow meter to ensure that the mass of the LNG flowing therethrough is less than an acceptable threshold, and wherein, if the mass of the LNG flowing through said mass flow meter is not less than the acceptable threshold, said controller halts any sales.