Size Steam or Gas Motive for Exhausting Gases

Using the Eductor Models SG and HG

Steam Eductor NozzlesThe JRG/JT models SG and HG are general purpose eductors used to pump gas with a gas as the motive stream. They can be used to pull both liquid and gas suction loads. In this case, we will deal with gas suction stream applications. The model SG is generally used with higher pressure motive flows in the ranges of 60 to 120 PSIG. It is possible to use lower pressures with these units if the outlet pressures are strictly controlled. The model HG is designed to be operated with motive pressures of 20 through 80 PSIG. Because of the increased motive flow rate in this unit, it generally will discharge against higher pressures. In general, the SG will pull a deeper vacuum on the suction connection than the model HG. If it is possible to meet the discharge conditions with the model SG, this unit is generally more efficient. Both SG and HG models can be used to evacuate, exhaust, or prime a given area. (See discussion on page 1, dealing with the difference in these applications.)

If the suction gas is not air at 70°F, refer to page 8 to convert the suction gas to Dry Air Equivalent. If the suction units are not in Lb/Hr, refer to the back cover to convert from other units to Lb/Hr. If your units are not found here, go to a conversion table in a book of chemical standards.


Show TableModels SG & HG  Gases Exhausting Gases Table for 1-1/2" Size Eductors (click to show/hide table)
Gas Exhausting Gas Table