4.5 - GREEN MACHINE
™
- North America - Installation, Operation, Maintenance, & Troubleshooting Manual
Chapter 2: Vapor Piping Installation
Page 46
2.3
Vapor Inlet and Vapor Return Piping Installation
•
Install a 1” vapor inlet pipe and a 1” vapor return pipe as shown in
Figure 2-1
from the vapor
inlet and vapor return connections on the GREEN MACHINE to an existing vent riser.
•
An existing vent riser that connects to the GREEN MACHINE must be modified by:
•
Adding the first tee (near the bottom of the vent riser) for connecting the 1” vapor
return pipe. The first tee must be installed to allow the vapor return to slope away from
the GREEN MACHINE.
•
Adding a second tee/cross (just below the P/V valve) for connecting the 1” vapor inlet
pipe. The second tee/cross must be installed at the top of the vent riser, but below the
P/V valve.
•
Both the vapor inlet and the vapor return
lines have: a 1” union, a 1” locking ball valve, and a 1”
tees/caps, and any other piping fittings to complete the installation.
•
The 1” vapor return pipe connecting to the bottom of the vent riser MUST BE INSTALLED below
the 1” vapor inlet pipe that
connects to the top of the vent riser.
•
A ¼” drain line MUST BE INSTALLED between the vapor inlet and the vapor return so any
condensate from the vapor inlet line can drain into the vapor return line. VST is supplying a ¼”
NPT x ¼” NPT adapter with a 0.
063 orifice. The orifice will eliminate any vapor flow between
the vapor inlet line and the vapor return line.
•
Install a tee into the vent riser that will connect to the GREEN MACHINE
Vapor Inlet using 1”
NPT pipe.
•
The new tee must be installed to allow for slope away from the GREEN MACHINE to the vent
riser.
•
If there are multiple-
grade UST’s and multiple vent risers, VST recommends connecting the
GREEN MACHINE to the lowest octane vent riser.
•
From the vent riser, install the 1” locking ball valve, then the 1” union, then the 1” tee.
See Figure 2-1
.
