Measuring and testing – With fluid pressure – Leakage
Patent
1995-06-07
1996-05-14
Chilcot, Richard
Measuring and testing
With fluid pressure
Leakage
340690, G01F 100
Patent
active
055157157
ABSTRACT:
A detector system and method for accurately indicating over- and under pressurization conditions within the piping network owned by the end user, includes the steps of: (a) introducing the natural gas stream to a filter selected from a group that includes at least activated charcoal and impingement adsorbing and absorbing media whereby natural gas contaminants concentrated in the gas stream at sufficient levels to be a detection threat by aperiodic loading of such network in which contaminants become clumped into packets due to dampening effects of the compressor-driven equipment and multiple customer outlet usage that add to aperiodic loading of the natural gas stream coupled with surprising longevity of the in situ contaminant, is filtered from the gas stream and captured, (b) passing filtered sample of natural gas and a sample of ambient air to a pair of identical systems excepting the set point level of each is formulated to indicated the occurrence of either an over-pressurization condition or of an under-pressurization condition wherein one or the other of the conditions within the end user's piping network is indicated, and (c) activating an indicating means to indicate to the end user the occurrence of the condition, by generation of a drive signal above a selected set point level] whereby inappropriate and unsafe operations of customer's appliances are avoided. The detection system uses a piezoresistive sensor which measures differential pressures between a filtered natural gas sample and a sample of ambient air entering the sensor to provide a pair of output signals.
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Biegel Ronald
Chilcot Richard
Messner Harold D.
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