RW Series Water-Bath Vaporizers

The RW Series vaporizer consists of a vertical ASME rated pressure vessel which is submerged in a water bath. The water is heated by a gas fired burner which consumes a small amount of vapor from the vessel to develop the heat required for vaporization. As liquid enters the vessel, it begins to vaporize, absorbing the heat stored in the water causing its temperature to decrease. The operating temperature switch monitors water temperature and signals the gas control valve to fire the burner when water temperature drops below set point (175 degrees F). The circulating pump keeps the water and glycol property mixed and assists in heat transfer by circulating the water throughout the tube, eliminating hot spots.
Ransome Model RW100 uses a mechanical liquid inlet valve that is actuated by a stainless steel ball located inside the vessel. If the liquid level rises above the inlet connection, the float will lift off the inlet valve allowing it to close, stopping the liquid flow. Once the liquid drops, the valve will re-open.
Ransome Models RW180 thru RW900 use an external float switch and electrically operated solenoid valve to stop the liquid flow. Once the liquid drops to a safe level, the float switch will re-open the valve.

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Description

Standard Features
• Mechanical liquid inlet valve provides positive control of LP-Gas liquid level on all RW100 units. RW180 thru RW900, use a reliable float switch and electric inlet valve to prevent liquid carryover.
• Millivolt-powered gas control system maintains proper water bath temperature under changing load conditions.
• Gas control valve is located inside the protective dry cabinet with the regulator mounted on the exterior providing for total ventilation.
• Precision operating temperature switch, factory-set and tamper resistant, incorporates precious metal contacts for extended service life.
• Two-stage pressure regulation provides accurate burner gas burner pressures and performance regardless of changes in inlet pressure.
• ASME code vaporizing tubes with integral heat exchange vanes and internal water chamber provide efficient vaporization with minimum burner input.
• Integral circulating pumps enhance heat transfer and temperature control capabilities.
• Modular design provides maximum capacity in a compact, rectangular unit.
• Double-Louvered combustion air baffles assure freedom from outages even during adverse weather conditions. (For extreme conditions, optional electric pilot reignitors are available).
• All sizes are capable of infinite turndown and will maintain a ready supply of vapor from zero load to full capacity. At no load, only enough heat will be generated to maintain water temperature and to prevent condensation.

Typical Installation
1. Equipment, piping and installation must be in accordance with provisions of NFPA58, and all applicable state, provincial and local codes.
2. Liquid pump may be required to provide sufficient pressure to inlet of vaporizer during conditions of low tank pressure.
3. Outlet pressure regulator should be no more than 24 inches from vaporizer outlet and located at or above centerline of vaporizer outlet.
4. Do not install a separator, dripleg or other liquid trap upstream of outlet pressure regulator.
5. Regulator outlet pressure must be adjusted to a pressure below the vapor pressure of the saturated LP-Gas at lowest oparating temparature or vapor may re-liquefy in downstream piping.
6. Liquid piping system must allow for occasional reverse flow toward supply tank to prevent excessive pressure during operation.

(1) Units may be paralleled to achieve greater capacities
Note: Intermittent Pilot System is standard on all RW Series. For use with other gases, consult factory for sizing information. (i.e. C3H6, NH3, SO2, C12)