generally the discharge elbow base. The airline should extend past the bowls to about the middle of the
motor. As the length of discharge pipe is known, the distance to the top of the bowl assembly from the
foundation is usually some multiple of 10 feet. Mark a point on the motor if the airline is to extend to that
depth. Measure the distance of the point below the lowest section of discharge pipe and add it to the
discharge pipe length. This is the total length of airline.
While the bowl assembly is in an upright position and before lowering into well, secure the first section of
airline to it, placing the lower and open end on the mark. It is a good idea to slot the airline with a sawcut
or two, some three to six inches above the bottom. This will reduce closure or clogging of the bottom
end. Fasten the line in place so that it will not slip downward as additional sections are installed. It is
recommended that the position of the upper end be marked on the discharge pipe as scion as each sec-
tion of airline is installed so that it can be noted if any displacement occurs.
Add sections of airline at random length after the sections of discharge pipe have been installed and the
pump is hanging from the hoist. It can be routed along with the power cable. Keep the airline outside of
the elevators and fasten to the discharge pipe after removing the elevators at the foundation level. Each
joint must be made up airtight to be effective; so use a thread sealing compound rather than a simple
thread lubricant.
The last section of airline will have to be cut and fitted for length to match with the fittings furnished with
the gauge and discharge elbow. Avoid hanging the weight of the airline on a fitting having its threads in a
horizontal direction. For example, if the line is to hang from an elbow, support
the elbow rather than the horizontal nipple just behind the elbow.
Mount the gauge and air valve on the discharge elbow and connect the airline to it. It is generally good
practice to remove the glass on the gauge and mark the depth of airline on the dial for record purposes.
It will also be helpful to add the date of installation. If at any subsequent time an extension is added to
the pump and the airline is extended also, the record on the gauge should then be brought up to date
with the new length and new date.
Gauges are two types: direct reading and altitude. Each uses the same values of pressure to determine
the depth. By pumping the airline full of air through the Schrader valve, the air pressure recorded at the
surface of the ground is equal (within small limits) to the depth of water over the end of the airline.
With a direct reading gauge it is necessary to set the hand to a point on the dial equal to the length of
airline. This must be done while there is no pressure on the gauge. Remove the Schrader valve core
before making this adjustment. This gauge will read the distance to the water when the airline is pumped
up. The hand will move away from the position equal to the pressure in the airline.
With an altitude gauge, this pressure is recorded directly on the gauge so that the depth pf water is equal
to the length of the airline, minus reading on the altitude gauge.
A periodic determination of water level recorded together with hours of pump operation form a vital re-
cord of the welI performance and changes. Well performance will vary or may even deteriorate over a
period of time and any required revisions in the pump san best be planned from a good well record.
5.11 Airline Installation and Operation
VIS Installation, Operation and Maintenance Instructions
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