ENG • 9.801-511.0 • Rev. 9/13a
29
PRESSURE
W
ASHER
DEALE
R’S MANU
AL
OIL CHANGE RECORD
PRESSURE EQUIVALENTS
Simply stated, pressure is the force exerted by a gas or liquid attempting to escape from a container. It is useful
to know how strong this “attempt to escape” is. Pressure can be measured with a manometer or with a pressure
gauge. At the lower levels, it is expressed in water column inches i.e. 11 w.c.i. Higher pressures are expressed
in terms of the force exerted against a square inch of area, for example, 125 lbs. per square inch (125 psi).
MAINTENANCE AND SERVICE
1" Water Column
=
50 oz./sq. in.
11" Water Column
=
6.35 oz./sq. in.
11" Water Column
=
4 lb./sq. in. 1 lb./sq. in.
=
27.71" Water Column
1 lb./sq. in.
=
14.73 lbs./sq.in
1" Mercury
=
.39 lb./sq. in
1 Std. Atmosphere
=
14.73 lbs./sq. in.
Date Oil Changed Month/
Day/Year
Estimated Operating Hours
Since Last Oil Change
