3-22. R.O. PRESSURE GAGE (psig).
a. General. TO verify serviceability or detect mechanical failure, test the R.O. PRESSURE psi gage. This
paragraph describes the inspection, cleaning, and tests to determine serviceability and accuracy of the gage.
b. Removal. If necessary, remove R.O. pressure psi gage in accordance with paragraph 2-67.
(1) Clean gage crystal.
(2) Clean pipe connector threads.
Drycleaning solvent Fed. Spec. P-D-680 is potentially
dangerous. Avoid repeated and prolonged breathing of vapors
and skin contact. Do not use near open flame, arcing equipment
or other ignition sources. Always wear protective clothing and
(3) Clean gage assembly with cleaning solvent Fed. Spec. P-D-680.
(1) Inspect exterior coating and case metal for signs of corrosion resulting from spray of water containing
salts and other chemicals.
(2) Inspect for leaks in shock-absorbing integrity.
(3) Inspect for watertight integrity.
(4) Inspect connections to pressure system, particularly threaded connections, machined socket, and
e. Pressure Test.
(1) Using a dead-weight gage tester (accurate to 1/10 of 1%), test gage at 300,600,900, 1200, and 1500
psi (21 .09,42 .18,63.28,84.37, and 105.47 kg/cm2).