Gasboy 552A Series - Manual (Page 10)

GASBOY 552A/553A Commercial Pumps
2-4 03/07/03
SUPPLY LINE
Always start at the pump and work toward the tank. Use new galvanized or fiberglass (see note)
pipe, 1-1/2" minimum diameter. (NOTE: Fiberglass pipe is to be installed according to
manufacturer’s specifications and requirements.)
Be sure both the pipe and the tank are clean. Foreign matter entering the pump can cause
extensive damage. Obstructions in the supply line can create pump problems and reduced flow
rate.
Make sure all pipe threads are properly cut and the inside reamed to remove burrs. Use UL-listed
gasoline-resistant compound on all joints of gasoline handling piping. Sealing compound must
also be resistant to Gasohol (Ethanol and Methanol). Do not use Teflon Pipe Sealing Tape. Use
gasoline-resistant pipe compound on male threads only; pipe compound used on female threads
can be squeezed into the supply line where it can enter the product stream and become lodged in
the pump or meter. Install swing joints under the pump and at the tank to avoid breaks in the
supply line from settling or frost heave.
To avoid product delivery problems on suction pumps, be sure there are no traps in the supply
line. Supply lines, for both suction pumps and submersible pumps, should go straight down
beneath the pump to a point 18 inches (46cm) below the ground level and pitch at a rate of 1/8
inch per foot (1cm/m) from there down to the storage tank. The supply line should be as short and
direct as possible with swing joints (two 90
o elbows and one shoulder nipple) at all turns. Support
the horizontal run of pipe at 10-foot (305cm) intervals to maintain pitch and prevent traps. Do not
use wood as pipe supports.
New EPA regulations require that only one check valve be used per supply line and located
directly below, and as close as practical to the suction pump. Do not use spring-loaded or union
check valves since these will unnecessarily reduce the flow rate and contribute to the reduction of
atmospheric pressure necessary to keep gasoline in a liquid state.
Upon completion of installation, all liquid-carrying lines must be checked for leaks.
Connecting the Suction Pipe
To connect the suction pipe, remove the tin protector from the flange opening in storage tank.
Assemble suction pipe, double tapped bushing and foot valve with suction screen. Insert into
tank, and tighten in position. Starting at suction nipple at base of pump, take pipe measurements
to union elbow on suction pipe riser at top of tank. Cut pipe, assembly together loosely. If
measurements are correct, uncouple all pipe joints and coat them up with a good grade of
gasoline-resistant sealing compound. If pipe measurements are incorrect, a new pipe must be
cut.
NOTE:
Underneath pump, a high grade valve with pressure relief must be used in suction
line.