CHART 3000 - Pressure Build; Economizer; Liquid Use; Gas Use

9
Introduction/OperationProduct Manual - Perma-Cyl
®
w/ FlexFill™ Piping Option
Caution! Before making a liquid transfer
either into or out of this
vessel, be sure that protective
eyeglasses and gloves are being
worn. If the transfer is being
made to an open top vessel, the
transfer pressure should be as
low as possible and a phase
separator should be used to
eliminate splashing and hose
whip.
Pressure Build
The pressure build circuit is used to build pressure back in
the vessel after a delivery or to maintain pressure as liquid
is withdrawn from the vessel. The vessel pressure is set by
adjusting the PB regulator (R2). Standard PB set points are:
MP - 125 psig
HP - 300 psig
VHP - 450 psig
As the tank pressure drops below the PB set point, the
regulator opens and allows liquid to ow off the bottom of
the tank, through the internal PB vaporization coils, through
the R-1 and back into the gas phase of the tank. The pressure
build circuit can be isolated by closing valves V-12 & V-13.
Some models of Perma-Cyl tanks can be equipped with
external pressure build vaporizers which allow for much
quicker recoveries after the tank has been blown down to ll
it or for high ow applications.
Economizer
The economizer circuit allows the customer to utilize the
natural heat leak that occurs in every cryogenic storage
vessel. When the pressure is above the setpoint of the
economizer regulator, the economizer regulator (R-1) opens.
This allows gas to be withdrawn directly off the headspace
of the tank and travel through the internal vaporization coils,
to warm the cold gas, and out the gas use valve. This will
result in lowering the pressure of the tank. The economizer
regulator can be isolated by closing valves V-2 and V-10.
Note: The economizer circuit will only work if
the customer is using product out of the
vessel.
Liquid Use
The liquid use circuit can be used for both a liquid
application or a high ow gas use application. This circuit
draws liquid directly up the dip tube and out through
the liquid use valve (V-4). Some models have a bottom
withdrawal valve that draws liquid out the bottom of the
inner. For a high ow gas use application the liquid can be
piped through a stand alone external process vaporizer. This
can more than double the standard ow rates that can be
achieved through the internal vaporization coils.
Gas Use
The gas use valve (V-1) leverages the internal vaporizer on
the Perma-Cyl system to supply gaseous product to the end
user.
Note: The liquid is drawn up the dip tube,
through the top knuckle and back down
through the internal vaporization coil
before exiting out the gas use valve.
The internal vaporizer can support specic ow rates. The
gas use valve used is a 1/2" globe valve. The line size for the
gas use should be sized properly for the pressure and ow
rate that is desired.
The Perma-Cyl tank will deliver gas at various ow rates and
temperatures for different applications. The equipment that
is being supplied gas from the Perma-Cyl tank controls the
ow rate. Higher ow rates may provide very cold gas that
could damage the equipment to which they are attached. To
supply gaseous product, follow this step by step procedure.
1. Connect the proper regulator/regulating manifold to the
liquid cylinder's gas use outlet.
2. Connect the proper piping between the nal line
regulator and the receiving equipment.
3. Open the pressure building valve.
4. Allow pressure to build to the operating pressure (refer
to gauge).
5. Open the gas use valve.
6. Adjust the gas use regulator for the proper delivery
pressure.
Caution! All valves on an empty Perma-
Cyl tank should always be kept
closed to protect the inner
vessel and plumbing from being
contaminated.