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8200 N. Austin Ave
 Morton Grove
IL 60053
USA
 Tel 847 966-3700
Fax 847 966-9052
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 Dictionary of Terms
Static Pressure
Head Pressure should not be confused with Static Pressure, as they have no relationship.
Static Pressure is created by the weight of water in the system.
Static Pressure has no effect on pump capacity. If you will consider a hot water heating system as being an upright loop of water confined in a pipe, the Static Pressure in one of the vertical pipes of the loop is identical with the pressure at the same level in the opposite vertical pipe.
The Static Pressure is equal to .43 pounds per sq. inch per foot of height above the gauge. For example, if the highest radiation is 20 feet above the gauge in the boiler, that Static Pressure at the gauge will be: 20 times .43 which equals 8.6 pounds per sq. in. At various elevations above the gauge, the Static Pressure becomes correspondingly less. At 10 feet, it is 4.3 pounds per sq. in., and at the top radiation, located 20 feet above the boiler, there is no pressure.HEAD PRESSURE NOT TO BE CONFUSED WITH STATIC PRESSURE
The Static Pressure at the point where the pump is installed is exactly equalized by the pressure at the same level in the opposite side of the loop.
The capacity of the pump is limited only by the friction in the pipes. This friction value is called the Head Pressure.
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