Gasboy Atlas Fuel Systems Site Prep Manual - Manual (Page 39)

MDE-4333E Atlas Fuel Systems Site Preparation Manual · November 2011 Page 35
Plumbing Requirements Site Preparation
Connecting the Vapor Return Line to the Vapor Shear Valve
Do not create any liquid traps when connecting the vapor return line to the vapor line Shear
Valve (see
Figure 3-9 on page 35 ). A liquid trap is a low spot in the vapor return line that can
accumulate fuel and cause blockage, which could cause a system to fail vapor recovery
certification tests or create operation issues with vapor balance nozzles.
Notes: 1) The contractor must provide and install the pipe union for connecting to the
1-inch NPT coupling in the unit.
2) Follow the vapor Shear Valve’s manufacturer information regarding mounting of the
Shear Valve to the unit.
Figure 3-9: Correct Vapor Line Connection Method
Correct
Do not allow Liquid Traps
No place for liquid to
be trapped
Not Allowed
1-inch NPT Vapor Return Pipe
supplied in the Unit
Contractor-supplied
Fittings, Pipe, and Shear
Valve
Contractor-supplied
Fittings, Pipe, and
Shear Valve
Vapor Line Shear Valve