Severn Trent Services offers standard and custom designed gas jet compressors, in-line blowers, and liquid jet exhausters to satisfy the specific process and performance requirements of our customers. These units are ejector venturi devices that entrain and pump air, gases, or process vapors.
Gas jei compressors utilize high pressure motive fluids such as steam, air. or other gas to entrain lower pressure steam, air. or other gas. The motive fluid passes through a custom designed nozzle. It ends the nozzle at a high velocity as the pressure energy is converted to kinetic energy Momentum present in the motive iiuid is transferred to the suction fluid as the two fluids mix in the body of the compressor The gases exit the venturi tail at a pressure intermediate lo the suction and motive pressures
The Type 620 Barstock Compressor and the Type 622 Fabricated Compressor are fixed nozzle gas jet compressors which can be used in both critical and sub-critical compressing applications. The Type 626 Variable Spuidke Gas Jet Compressor can be used only in ',ub critical compressing appbcalions.
The Type 626 Variable Spindle Gas Jet Compressor is suitable in applications with a large variation in conditions, such as those encountered in waste steam recovery. The Type 626 Compressor is equipped with an actuator that adjusts a spindle The spindle moves in and out of the motive nozzle, varying the effective nozzle area and the resulting motive gas flow rate. The actuator is typically adjusted trom a controller mounted downstream of the jet compressor The controller usually senses pressure or temperaiure and adjusts the motive I low rate to meet the system performance requirements
The term 'ihermocompressor' is applied to a gas jet compressor utilizing motive steam to enirain and compress suction steam.
Gas jet compressor performance is determined largely by the energy available in the motive fluid Actual performance depends on the operating conditions ol a particular application Entrainmenl and compression are inversely related EST factory engineers are available to assist in sizing.
Gas ]et compressors can be used wherever a higher pressure gas, air. or steam source is available. Compressors are especially useful in recovering waste steam with higher pressure makeup steam Thermocompressors have lower initial and maintenance costs than mechanical compressors. Typical applications for gas jet compressors include boosting Ihe pressure of low pressure waste steam or waste gas. gas compressing, and natural gas mixing stations
A large number of applications utilize motive steam lor steam recovery and gas mixing Typical equipment tor which steam is recovered includes paper and textile drum dryers, evaporators, heaters, kilns, and vulcanizers
The chemical, pharmaceutical, petrochemical, pulp and paper, and power industries have all successfully utilized gas jet compressors.
The gas jet compressor is available in a vartoiy ot construction materials. including carbon steel, stainless steel. Monel. Haslelloy. titanium and Teflon Smaller compressors are machined from bar while larger sizes are labrKated from plate The motive nozzle and venturi tail are custom designed for the application. Connections are typically threaded or flanged, but special connections can be provided.