Gas PipingQuestion 248 of 360
When performing a gas piping pressure test, why should the test gauge have an appropriate scale for the test pressure?
a.Because a bigger gauge always reads more accurately
b.Because the code bans digital gauges
c.So that a small pressure drop is readable, the gauge increment should be fine enough to detect a leak
d.Because gauges must always read in psi, never inches of water
Explanation
The test gauge or manometer must have an increment fine enough that a small leak shows up as a readable pressure drop over the hold period. An oversized gauge with coarse graduations can hide a slow leak. Match the instrument range and resolution to the required test pressure and the sensitivity needed.
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