I
nstallation
Operations
1. Remove the Day Tank top. Check all visible hardware for
tightness. Attach the Vent Pipe. This is an NPT internal
connection. The vent pipe allows equalization of internal
Day Tank pressure.
DO NOT INSTALL A VALVE IN
THE VENT LINE!
Venting provides pressure relief in case
of overfill, rapid expansion, or gasification of contents in
the event of fire. The Day Tank may become
permanently distorted at pressures above 5PSI (10 and 25
gallon) and 3PSI (50–400 gallon) and may rupture at
pressures above the maximum withstand pressure of 25PSI
(10 and 25 gallon) and 15PSI (50–400 gallon). Day Tank
operation without a vent pipe is strictly not recommended.
The vent pipe should be at least 5 feet higher than any
other pipe and should terminate outdoors. The vent pipe
must be installed per local building codes and per NFPA
30 including but not limited to Section 19.5.3. There should
be no low portions or sags in the vent pipe which can trap
liquid. The end of the pipe should be fitted with a 180°
weather protected vent cap to shed water and should be
screened to keep out pests, leaves, etc.
2. Attach the Overflow Pipe. This is an NPT internal
connection. Simplex recommends the configuration shown
in the illustration below. The overflow pipe runs from the
Day Tank back to the main storage tank and allows for
draining of the tank should it become overfilled. This pipe
should be sized at least twice the diameter of the pump fill
pipe (minimum 1"I.D. for 10 and 25 gallons; minimum 2"
I.D. for 50-500 gallon). If the tank becomes overfilled and
the overflow line is not connected or is obstructed the tank
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