Gasboy 580 Series - Manual (Page 14)

Installation Supply Line
Page 10 MDE-4766 Series 580 Installation/Operation/Parts Manual · April 2009
Use a 2-inches pipe for standard flow units (excluding the riser) for runs up to 50 feet from the
tank. Use 2-1/2-inches to 3-inches for longer (excluding the riser) runs up to 75 feet. High
gallonage units should use larger pipes such as 3-inches (excluding the riser) for runs up to
50 feet. Use 3-1/2-inches to 4-inches (excluding the riser) for runs up to 75 feet.
Ensure that 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.
Ensure that all pipe threads are properly cut and the inside reamed to remove burrs. Use
UL-listed, non hardening sealing compound suitable for the fluid being dispensed, on all joints
of the fuel handling plumbing. The sealing compound must also be resistant to Gasohol
(Ethanol and Methanol) when used with those fuels. Do not use Teflon Pipe Sealing Tape. Use
the sealing 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 or approved flexible pipes 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, ensure that there are no traps in the
supply line. Supply lines should go straight down beneath the pump to a point 18-inches
(45.7 cm) below the ground level and pitch at a rate of 1/8-inch (3.18 mm) per foot (.305 m)
from there down to the storage tank. The supply line should be as short and direct as possible
with swing joints at all turns. Support the horizontal run of pipe at 10 foot intervals to maintain
pitch and prevent traps. Do not use wood as pipe supports. No additional check valves are
required as the suction pump contains an inlet check valve.
Note: After completion of installation, all liquid-carrying lines must be checked for leaks.