L.B. White Pilot - Manual (Page 18)

LP Gas Tank Manifolding
Installation
Instructions
2.5-1 1
August 1999
ATTENTION
■ The following is supplied for informational purposes
only.
■ Tank manifolding shall only be accomplished by a
qualified LP gas installation person.
■ Local and state codes must be observed at all times.
■ In absence of state and local codes, follow
ANSI/NFPA58 Standard for Storage and Handling of
Liquefied Petroleum Gases.
It has been a long-standing industry practice to manifold two
or more LP gas storage tanks together in order to increase
gas system vaporization capacity.
However, when tanks are manifolded together, never use a
first-stage regulator at each tank. If this is done, the total
required capacity for the installation may not be obtained. It
is almost impossible to set all regulators at the identical
pressure. Therefore, the regulator delivering the highest
outlet pressure will backpressure the other regulators, in
turn keeping them from operating. In effect, only one tank
would be supplying gas to the building. In this situation,
especially on large capacity installations, ignition failures
would occur due to poor gas volume and pressure.
To eliminate this problem, run high pressure piping from the
LP gas tanks into a common line, then install one first-stage
regulator that can handle the required capacity of the
installation. Refer to the following illustrations.
TO BUILDING'S
SECOND STAGE
REGULATOR(S)
1,000 GALLON
TANKS
FIRST STAGE
REGULATORS
(ONE FOR
EACH TANK)
INCORRECT INSTALLATION CORRECT INSTALLATION
1,000 GALLON
TANKS
FIRST STAGE REGULATOR
TO BUILDING'S
SECOND STAGE
REGULATOR(S)