What are the maximum limits for the pressure gauge according to test pressures not exceeding 5 psig?

The correct choice indicates that the maximum limits for the pressure gauge, when considering test pressures that do not exceed 5 psig, should ideally be 10 or 15 psig. This is due to the need for the pressure gauge to be appropriately rated for the test pressures being applied, ensuring it can accurately measure and safely handle pressures above the maximum testing pressure.

Essentially, when testing systems to a maximum of 5 psig, a gauge rated higher (like 10 or 15 psig) is essential to prevent damage to the gauge itself and to ensure reliable readings. If a gauge is rated too close to or lower than the test pressure, it could be subject to inaccuracies or failures which could compromise the safety and validity of the testing process. The selection of gauges with a range beginning above the maximum test pressure helps ensure that they function within their operational capabilities. As a result, the values of 10 or 15 psig serve as safe upper limits in this context, facilitating effective monitoring of pressures during tests without the risk of overstrain on the equipment used.