30
Maintenance
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).
Oil Change Record
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
Landa ENG Operator’s 9.801-511.0 - F
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