Rust in Hermetically Saled Compressor

[kkg123]

Hermetically sealed compressor are used in Refrigeration Industry & most of the compressor fails because rust formation in side the compressor. Is there any chemical by which it can protect from rust forming. If yes whether this chemical is compatible with refrigerant & refrigerant grade oil.
Thanks

 

[spector]

Sorry, the best prevention is to remove any moisture in your system and keep it out. If you are experiencing leaks and having to recharge, then fix the leaks. There really is no alternative.

 

[VEEKRISH]

Why do you have rusting problems. That is strange. Never experienced that. Usually when compressors are not in use, it is customary to pressurize with Nitrogen to avoid such rusting. Also you must ensure that before start up system is evacuated and all moisture is removed prior to charging. With these simple precautions, rusting should not occur.

 

[ClydeMule]

kkg123,

We have seen rust in hermetically sealed compressors, but only when there is an evaporator leak (chiller application), and water gets pulled into the system.

Like the other guys said, when this happens, it is become of some other failure. It is not something that would normally occur.

Clyde

 

[spector]

If you have rust in a hermetic system, you must mean a low pressure chiller. As HP types only get moisture introduced when serviced or recharged.

R-11 and 123 chillers are moisture magnets...Especially when idle. Rather than press up an idle chiller with Nitrogen, consider using a 'pressure pac' device. They can be installed rather cheaply. N2 has to be purged prior to operation. And purging N2 always cost you lots of expensive refrigerant.

The pressure pac is nothing more than a small pump and tankless waterheater that is piped to the heads of the chiller thru existing 3/4" or 1" water connections. It can be placed in automatic where it will maintain the chiller at either 0 or 5 psi, whatever you select. The pressure pac is wired where it will automaticlly activate after shutdown. At 0 PSI there is not much chance for air to leak in or refrigerant to leak out. At 5 psi, you can check for leaks or perform service work like oil changes quickly.

There are other types of pressurizing devices that instead heat the refrigerant, not the water. Either will work and none require Nitrogen.

Here is one type:

http://www.reftec.com/enviropump.htm