A gas dryer is designed to remove water vapor from compressed natural gas. These are available in many different types and used for various drying purposes. A refrigerant type gas dryer is used to remove excess water from the compressed gas by lowering the temperature of the compressed gas to between 35F and 40F.

Gas ejectors help liquid ring vacuum pumps meet lower absolute pressures. It operates without an outside energy source by utilizing the existing energy drop between atmosphere and the pump suction branch. Normally the gas ejector is mounted directly onto the suction branch of the pump. The efficiency of an ejector depends particularly on the suction capacity of the vacuum. In addition, this ejector pump acts as a protection against cavitation.

Gas engine vacuum units are designed to use with vacuum tank systems. It is ideal for truck systems that require auxiliary power. It requires a line from the vacuum pump to the tank for installation. Gasoline powered units are complete with relief valves and supplied with oil catch muffler. A primary shut-off and secondary moisture trap is installed in the line from the pump to the tank.

Gas expander is a power generating mechanical device that converts thermal energy into useful mechanical work. It does so by using an isentropic process. Gas expander is a centrifugal or axial flow turbine through which a high-pressure gas is expanded to produce work that is typically used to drive a compressor. Due to the reason that work is extracted from the expanding high-pressure gas, the expansion is isentropic and the low-pressure exhaust gas from the turbine is at a very low temperature, often as low as 200 K or less. Turbo expanders are very widely used as sources of refrigeration in industrial processes such as the extraction of ethane as well as natural gas liquids from natural gas, the liquefaction of gases and other low-temperature processes.