Quote:
Originally Posted by kevin.li.rit
Does the steps to calibrate the pressure switch fall within R76? It doesn't seem to so I'd be careful about actually doing this.
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The precedent might be that you can adjust the emergency relief valve (and often must) despite it not being an exemption in R76. Then again, the relief valve is governed by R87, which includes a blue box text that explicitly allows for adjusting it. R88, which governs the switch, does not have any similar language. It's sort of a grey area.
My gut would say it's not a alteration of the pneumatic part
per se, but a calibration of one using a method designed for that purpose. So long as it turns off the compressor at or below 120 and does so consistently I don't see a rules compliance issue. This hinges on whether the GDC/Inspectors interpret it as a alteration or not.
It's probably worth a Q&A.