Patent ID: 6698463
Filing Date: 2004-03-02
Classification: F17C,Y10S

Abstract:
A method for controlling a hazardous fluid distribution facility having a perimeter with an entrance, an electrical power input, a source of gas under pressure, a principal fluid storage tank, a tank valve pneumatically actuable to provide fluid flow communication with said principal storage tank and having a closed state in the absence of said actuation, a fluid pump in fluid flow communication with said tank valve, a motor coupled to drive said fluid pump when enabled and actuated, a fluid transfer station and a fill valve in fluid flow communication with said pump and connectable when pneumatically enabled and actuated in fluid delivery communication with a distribution tank, said fill valve having a closed state when pneumatically disenabled, comprising the steps of:providing a power switch coupled with said electrical power input, said power switch being actuable to provide an electrical power output and an off condition; providing a start switch coupled with said power switch and actuable to respond to said electrical power output to provide an on-state input; providing an electrically controllable valve coupled in gas flow relationship between said source of gas under pressure and a gas conduit assembly extending to said tank valve and said fill valve, responsive to an on-state input to convey gas under pressure from said source into said gas conduit assembly and effecting a venting of said gas conduit assembly in the absence of said on-state input; providing a gas pressure monitor responsive, when enabled, to the pressure of gas at said conduit assembly, having a system enable condition when said gas pressure is at an enable value and having an off condition when said gas pressure is lower than said enable value; actuating said power switch to provide said electrical power output; actuating said start switch to derive said on-state input and to enable said gas pressure monitor for an interval sufficient to derive said system enable condition effecting the pneumatic actuation of said tank valve and enablment of said fill valve and said motor; actuating said motor and said fill valve and delivering fluid from said principal storage tank to said distribution tank; and then actuating said power switch to provide said off condition to effect said venting of said gas conduit assembly at said electrically controllable valve to in turn, effect said closed state at said tank valve, effect said disenablement of said fill valve, and effect disenablement of said gas pressure monitor and said motor.