RH Series Direct-Fired Vaporizers

The Ransome RH Series vaporizer consists of a vertical ASME rated pressure vessel which is directly heated by a gas fired burner. The burner consumes a small portion of vapor from the vessel to develop the heat required for vaporization. As liquid enters the vessel, it begins to vaporize as heat is absorbed from the warm heat exchanger. This causes the vapor temperature to decrease. The operating temperature switch monitors vapor temperature and signals the gas control valve to fire the burner when vapor temperature drops below set point (120 degree F).
Ransome Models RH50 thru RH120 use a mechanical liquid level control system that consists of a mechanical inlet valve, which is actuated by a stainless steel ball located inside the vessel. If the liquid level rises above the desired level, the float will lift off the inlet valve lever allowing it to close, preventing a liquid carryover. Once the level drops, the inlet valve will reopen.
Ransome Models RH200 thru RH1000 use an electrically operated liquid level control system which consists of an external float switch and solenoid valve. If the liquid rises above the desired level, the float will close the solenoid valve to prevent a liquid carryover.
Download RH Vaporizer Brochure
Download RH240 Vaporizer Brochure

Download 9V Option
Download ESV Option



Standard Feature
• Mechanical liquid inlet valve provides positive control of LP-Gas liquid level on all RH50, 80 and RH120 sizes. Larger sizes use reliable float switch and electric inlet valve to prevent liquid carryover.
• Millivolt-powered gas control system maintains consistent vapor 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 sealed against tampering, 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 insulated ducts provide efficient vaporization with minimum burner input.
• 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 vapor temperature and to prevent condensation.

9V Relight System with Solar Recharger
The Ransome 9V Relight System protects against pilot outage due to unusually turbulent atmospheric conditions. The 9V Relight System option is for use in the field where 110V line power is unavailable. Unit operated by two 9V batteries and Solar Panel.

Emergency Shutoff Valve
Vaporizers Pre-Plumbed with Remote Thermal Elements for Pneumatic Means of Safety Shut-Down.

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 operating temperature or vapor may re-liquefy in downstream piping.
6. Liquid piping system must allow for occasional reverse flow toward supply tank to prevent excessive pressures during operation.

(1) Units may be paralleled to achieve greater capacities.
Note: For usage with other gases, consult factory for sizing information. (i.e. C3H6, NH3, SO2, C12)