These models are manufactured with naturally aspirated (venturi-type) burners, intermittent pilot, flame detection sensor (thermocouple or flame rod), and electronic ignition module. The burner controls are enclosed for protection from the elements. Standard safety devices include: (1) failsafe electronic burner controls; (2) high water bath temperature limit; (3) low water limit; (4) low LP gas temperature switch (liquid carryover protection); and (5) water temperature control. Electrical requirements are AC 120/220 V 50/60 Hz, 15 A, single phase.

These models are manufactured with high-efficiency power burners. All safety functions of the vaporizer are constantly monitored by a Programmable Logic Controller (Allen-Bradley PLC), which communicates with a graphic display operator interface (Allen-Bradley PanelView). The operator interface is used to monitor and display the system status; any failure message will be displayed in plain English; first-outage-monitor (in the main system control panel) is standard. The PLC is installed together with the Honeywell flame control module in the control panel, which is mounted in the vaporizer control room. The full-size walk-in vaporizer control room can be extended to form a maintenance house, providing additional weather protection for operating and maintenance personnel (extended control rooms are standard on models WB-1800 and above. All control rooms are equipped with receptacles and light fixtures.

The vaporizers are equipped with a “smart” liquid carryover protection. Vapor pressure and temperature are constantly monitored by a dedicated Rosemount pressure transmitter and a temperature transmitter. Their signals are processed in the PLC and are compared against the vapor pressure/ temperature saturation curve of the LPG that is being vaporized. The properties of the LPG (Propane/Butane percentage), and the “safety margin” (how close the pressure/temperature are allowed to come to the saturation curve) can be entered through the operator interface. If the safety margin is “breached”, the liquid inlet solenoid valve is closed after an adjustable alarm delay period has elapsed.

MODEL WB-7000 thru WB-1xxxx

These models are usually configured for specific customer applications, for example for use by utility companies in PeakShaving systems. Since PeakShaving systems often operate at elevated pressures, the heat exchangers of these vaporizers are enlarged to increase the dwell time of the LPG in the vaporizer, thereby increasing the amount of superheat that is transferred to the LP vapor (see above).

Other modifications can include high-capacity water circulating pumps (to further reduce heat stratification in the water bath); NatGas fired burners (instead of LP fired burners); non-standard PLC configurations (i.e. for integration of the vaporizer controls into an existing SCADA system); etc.

HEAT TRANSFER SOLUTION

Water Bath Vaporizers use - as the name implies - water as the heat transfer medium. However, since the heat exchanger components and the bath box of the WB series are manufactured from carbon steel, it is recommended that the heat transfer solution be a mixture of water and an industrial coolant/heat transfer fluid with inhibitors to provide rust/corrosion protection.

Please follow this link to more information about Heat Transfer Solutions for Water Bath Vaporizers.