Method and means for filtering contaminants from a gas stream to

Details Method and means for filtering contaminants from a gas stream to Method and means for filtering contaminants from a gas stream to

1995-06-07

1996-11-19

Chilcot, Richard

Measuring and testing

Fluid pressure gauge

With pressure and/or temperature compensation

73724, G01L 1300

Patent

active

055764932

ABSTRACT:
A detector system and method are described for accurately indicating filter capacity of a filter assembly positioned 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 an unfiltered sample of natural gas stream and a filtered sample of such stream to the detector system of the invention wherein capacity of the filter assembly located within the end user-customer's piping network is indicated, and (c) activating an indicating means to indicate to the end user the need to change the filter within the filter assembly, by generation of a drive signal whereby inappropriate and unsafe operations of customer's appliances are avoided. The detection system uses a piezoresistive sensor which measures differential pressures between the unfiltered and filtered natural gas samples entering the sensor to provide a pair of output signals with the difference between these signals being related to the filter capacity.

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