Automatic Gas Purger For Refrigeration Plants

Bringing Energy Down to Earth :

Save Energy, Think Environment, And vice versa. Any company that is energy conscious is also environmentally conscious. Less energy consumed means less waste, fewer emissions and a healthier environment. In short, bringing energy and environment together lowers the cost industry must pay for both.

MANIKS development in Fully automatic Gas Purger has led to countless saving in energy, time and money.

What are "Non Condensible Gases" in a Refrigeration system?

Refrigeration systems accumulate "foul substances". The foul substance gaseous in nature, are commonly referred to as non - condensible gases . Non - condensible gas constituents commonly include air, nitrogen, hydrogen, and hydrocarbons . The term non - condensible" means that, these gases will not liquefy at the temperatures and pressures present in condensers consistent with industrial refrigeration systems. For example, ammonia will change phase from gas to liquid if heat is removed while at a temperature of 35°C and a pressure of 12.5 Kg/cm2.

At the same pressure, any nitrogen present would have to be cooled to -264°F (-164°C) in order to liquefy. As a result, any nitrogen that may accumulate in a refrigeration system always will remain in a gaseous state.


  • The refrigerant, when delivered, may contain non-condensible up to 15%.
  • For service and maintenance certain parts of the refrigeration plant are frequently opened, causing air to penetrate into the system. Oil changing and recharging with refrigerant have the same effect.
  • Leakage: Systems operating with suction pressure below atmospheric pressure (i.e., working temperatures below -33°C for ammonia system) can have small leaks (from system piping, valves, vessels valve stem packings, bonnet gaskets, compressor shaft seals, non-welded connections, and control transducers etc.) allowing air to penetrate into the system.
  • Inadequate evacuation before commissioning the refrigeration plant.
  • Decomposition of the refrigerant or the lubricating oil can occur due to catalytic action of the various metals in the installation and due to high discharge temperatures. Ammonia for instance decomposes into nitrogen and hydrogen.


Non - condensable gases cause considerable loss of efficiency. Air or other non-condensable gases can dissolve in the refrigerant and come into circulation in the refrigeration system, causing even in small concentrations a significant increase in condensing pressure, resulting in a considerable loss of efficiency.

The Non-condensable gases such as Air in the condenser will raise head pressure, mainly due to its insulating properties. The air molecules in the gas from the compressor will be blown to the quiet end of the condenser. When condenser surfaces are insulated with air, the effective condenser size is reduced.

The presence of non-condensable gases :
  • Increases electrical power demand
  • Decreases Refrigeration system efficiency
  • Decreases system efficiency
  • Excess head pressure puts more strain on bearing and drive motors. Belt life is shortened and gasket seals are ruptured.

Increased pressure leads to increased temperature, which shortens the life of compressor valves and promotes the breakdown of lubricating oil.

Increases condenser scaling Water content in the Air lead to corrosion inside the refrigeration plant and to problems with automatic controls.

"Ammonia explosions" due to accumulation of non-condensable hydrogen. Refrigeration systems must therefore be kept as free as possible from non-condensables. The most effective way of doing this is by automatic purging, as this responds immediately to any entering of non-condensables in the system.

The MANIKS make fully automatic gas purger for refrigeration plants Type SGP-2E efficiently and automatically helps maintaining condensing temperature at nearly optimum operating conditions and reduces the concentration of non-condensable gases to a negligible percentage.


It is impossible to calculate the amount of non-condensable gases, which has to be removed from a specific refrigeration plant.

Usually plants operating with a suction pressure above the atmospheric pressure are less inclined to collect non-condensable gases than plants operating with a absolute pressure below 1 bar. However, great quantities of non-condensable gases are often found in both categories of plants. For ammonia plants with a suction temperature below -35°C, one gas purger is recommended at capacities below 500 kW. For plants with a suction temperature above -35°C, one gas purger per 1000 kW is recommended as a minimum.

The capacity of the gas purger will be reduced at high ambient temperatures so it is recommended to insulate the vessel.

To order air purger use following models :
  • Single point Air Purger - SGP2E - 1
  • Two point Air Purger - SGP2E - 2
  • Four point Air Purger - SGP2E - 4
  • Six point Air Purger - SGP2E - 6
  • Eight point Air Purger - SGP2E - 8

Please specify refrigerant such as Ammonia(R717), fluorinated refrigeration (R22, R404a) etc.

Special Services
  • We offer special service for your existing system components for pneumatic pulse application, to recondition your inoperative valves and assure operating reliability as good as new . DO NOT scrap your valves (ONLY IMPORTED) unless inspected by our experts.
  • We provide special enclosures for timers such as flame proof enclosures , SS enclosures , FRP enclosures , IP65 enclosures on request.
  • We also cater to special requirement such as flame proof enclosures for valves.