08-SERIES: MODEL WB-168 THRU WB-508
These models are manufactured with a European-style, high-efficiency compact power burner. All vaporizer functions are constantly monitored by a Programmable Logic Controller with Ethernet interface (PLC; Siemens S7-1200 or Allen-Bradley MicroLogix-1100), which communicates with a graphic display operator interface (color LCD display with touch screen). The operator interface is used to monitor and display the system status; any failure message will be displayed in plain English; first-outage-monitor (Alarm History) and graphic trend recording are standard. The PLC is installed together with the Honeywell Satronic flame control module in the control panel, which is mounted in the vaporizer control room. The full-size step-in control room is equipped with country-specific receptacles and light fixture.
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.
A Dräger GasLeak Monitor with long-life infrared sensor (expected life 10+ years) monitors combustible gas levels in the control room. The vaporizer will be shut down if the concentration reaches 40% LEL.
Three Agency-approved Safety Relays elevate the safety rating of the 08-series vaporizers to “Performance Level 4” (SIL 3).
05-SERIES: MODEL WB-455 THRU WB-5505
These models are manufactured with high-efficiency Maxon TOT (or similar) power burners. An electronic thermostat (Rosemount temperature transmitter) provides low-fire/high-fire burner modulation. All vaporizer functions are constantly monitored by a Programmable Logic Controller with Ethernet interface (PLC; Siemens S7-1200 or Allen-Bradley MicroLogix-1100), which communicates with a graphic display operator interface (color LCD display with touch screen). The operator interface is used to monitor and display the system status; any failure message will be displayed in plain English; first-outage-monitor (Alarm History) and graphic trend recording are standard. The PLC is installed together with the Honeywell flame control module in the control panel, which is mounted in the control room. The full-size step-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-1805 and above). All control rooms are equipped with country-specific receptacles and light fixture.
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.
A Dräger GasLeak Monitor with long-life infrared sensor (expected life 10+ years) monitors combustible gas levels in the control room. The vaporizer will be shut down if the concentration reaches 40% LEL.
Three Agency-approved Safety Relays elevate the safety rating of the 05-series vaporizers to “Performance Level 4” (SIL 3).
05-SERIES: MODEL WB-7005 thru WB-1xxx5
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.
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.
08-SERIES and 05-SERIES: 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
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