Owner's manual

TW-407 Rev.-

External Pressure builder, and Economizer Circuit

The pressure builder(PB) inlet circuit provides pressurized cryogenic liquid to an external pressure



into the external pressure builder. The pressure builder uses heat from the ambient air to convert the

liquid into a gas and warm it.

The economizer circuit reduces product loss due to normal evaporation of the liquid within the vessel.

The pressure builder outlet valve (V-6) and the economizer circuit isolation valve (V-5) must be open for

the circuit to function. The economizer regulator (PCV-2) opens when the pressure within the vessel





pressure will be reduced. The primary safety valve (SV-2) will be prevented from opening, avoiding

product loss.

The economizer circuit may be isolated for maintenance without emptying or depressurizing the ves-

sel. Closing the pressure builder outlet valve (V-6) and the economizer circuit isolation valve (V-5) iso-

lates the circuit.

Figure 5: External Pressure builder, and Economizer circuit highlighted

V5

PCV2

SV2

V6

V7

External Pressure builder, and Economizer Circuit