Pressure Gauge Dead Weight Tester

[Trevor Drabble 1Participant @trevordrabble1]

Just wondering , do the insurance companies who insure our boilers stipulate any accuracy parameters for our gauges ?

[Michael GilliganParticipant @michaelgilligan61133]

Posted by duncan webster on 01/09/2022 23:13:35:

Just to add fuel to the fire, my understanding of calibration is that you produce a table of errors so that even if the gauge reads incorrectly, you know what the applied pressure is. The gauge does not have to read 200psi when the DWT is applying 200 psi.

.

Your understanding is good, Duncan

But of course that table [or a single correction factor if the error is linear] then becomes an integral part of the calibrated instrument.

Ship’s Chronometers were done that way : Greenwich would certify a gaining or losing rate. … A concept succinctly described here:

https://en.wikipedia.org/wiki/Marine_chronometer#Chronometer_rating

MichaelG.

Edited By Michael Gilligan on 02/09/2022 07:26:50

[DMBParticipant @dmb]

Michael G and Duncan,

I simply don't know but I think it's very likely that it is 2% of total gauge deflection.

Trevor, as Treasurer, I deal with the annual questionnaire from the Insurance Broker and if I remember they don't specify any accuracy parameters. I will be checking that and advise our boiler inspectors.

John

[Author]

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