Compressor upper cover inflation !!!!!!!!!!!!

[kefah]

Hi
i got a split as heatpump with burn out compressor
Its R22 24000 BTU
after removing the compressor
i flushed evaporator and condenser and capilary tube with paint thinner (as i do in usually)
then flushed them with plenty of R22 and
replaced the filter
I installed a LG rotary compressor with same specification of the old compressor
after making vacuum for 30 minutes
i charged the system according to Gauge reading not by weight
so the compressor wasn't work normally
as the liquid line kept icing
so i removed the compressor from the unit
then welded a service valve to to its discharge pipe
then i attached the manifold gauge and closed it
i switched on the compressor
so when its reached 300 psi
its opened internal safety valve

so i realesed the air from it
then i switched it on when its reached 300 psi
the compressor upper cover get inflated








then i opened the compressor

[install monkey]

you sure the shell wasnt that shape before?- internal safety would go before max test pressure rating.
liq line can frost until properly charged.
think you may have invalidated any warranty claim!

[kefah]

im sure its inflated
and the charge was nearly complete
and about the warranty
there was no waranty

[Magoo]

A lot of contamination effect in opened compressor pics. Did the LG replacement have polyester oil in it, could be a cross contamination problem, combined with acid in system from initial R22 compressor failure, combine with paint solvent flushing agent. A real ****tail of chemical inter-action.
I do not generally get involved with scrolls but some the casing is at discharge pressure, I think. The casings have a design limit of internal pressures before swelling/ bursting, and discharge back to suction internally. They have a maximum compression ratio operating envelop to protect scroll casing from failure.

[bigor_2]

It's copperization or optical illusion?

[kefah]

A lot of contamination effect in opened compressor pics. Did the LG replacement have polyester oil in it

the new compressor and the old are R22 refrigerant

, could be a cross contamination problem, combined with acid in system from initial R22 compressor failure, combine with paint solvent flushing agent.

i meantioned that i flushed them with plenty of R22

I do not generally get involved with scrolls but some the casing is at discharge pressure, I think. The casings have a design limit of internal pressures before swelling/ bursting, and discharge back to suction internally. They have a maximum compression ratio operating envelop to protect scroll casing from failure.

so why the upper case inflated

[kefah]

It's copperization or optical illusion?

?????????????

[bigor_2]

it's copper deposition?

[kefah]

it's copper deposition?

yes its copper deposition

[bigor_2]

This thread is continuation of http://www.refrigeration-engineer.co...ary-compressor or not?

[kefah]

no
its different one

[kefah]

the one in this thread is LG rotary
the one that was in the http://www.refrigeration-engineer.co...ary-compressor
is panasonic

[Rob White]

yes its copper deposition

I think that Bigor was asking because if it is copper, where did it come from?

Copper on the inside of a compressor normally is the result of acidic oil and
electrolysis normally caused by moisture and contamination.

Rob

.

[Rob White]

.

I'm not saying it hasn't distorted the compressor, but I can't see anything
unusual from the photo I see and I've never heard of a hermetic compressor
distorting this way from closing a service valve. I did not think it would be possible
for a scroll compressor to pump high enough pressure for it to fail in the way?

I'm not saying it can't happen, I have just never heard of it before.
The only compressors that I know to have distorted were charged
up with Nitrogen and that was at pressures far in excess of 300psi.

300psi is nothing in pressure for a compressor like that, it's only 21 bar
and R22 would reach that at 55 degC?

That compressor would have to conform to a pressure well in excess of
40 bar (600psi) for it to be deemed a pressure vessel in the EU and if
I remember correctly I think it would have to be capable of withstanding
a temperature that is equal to 100 degC for a certain period of time and
that is off the scale of R22.

Regards

rob

.

[kefah]

as i said i removed the compressor from the unit
then i welded s service valve to its discharge port to it
i closed the gauge and switched on the compressor
when the pressure reached 300 psi
upper case inflated

[monkey spanners]

Maybe it dieseled, think the motor is open to the high side pressure on those, air 300psi it air and oil vapour would make a flammable mixture.

There was a guy in Africa blew an ac system and compressor apart doing something similar.

[kefah]

Maybe it dieseled, think the motor is open to the high side pressure on those, air 300psi it air and oil vapour would make a flammable mixture.

There was a guy in Africa blew an ac system and compressor apart doing something similar.

this is the most accepted story
thank u pal

[bigor_2]

2 kefah
I'm sorry but I do not quite understand your technology.
You doing fill the paint thinner into refrigerant circuit?

[kefah]

no man
i really appreciate your help
and im sorry for my broken English

here what i do
i un weld (remove) the evaporator and condenser and capillary from the unit
all parts now separeted from each other
then
i inject nearly 100 CC of paint thinner into each part
then i use plent of R22 refrigerant into the parts to remove the paint thinner

[hyperion]

Definitely think that you had the remains of the paint thinner along with air/oil mixture in the system, causing an internal explosion, as 30 minutes on the vac pump might not have been long enough to boil off the residue.
It is really not advisable to use any non compatible cleaners/solvents in refrigeration systems, the chemical mix will eventually cause major operational problems.

[kefah]

Definitely think that you had the remains of the paint thinner along with air/oil mixture in the system, causing an internal explosion, as 30 minutes on the vac pump might not have been long enough to boil off the residue.
.

ok
the inflation happened after i removed the compressor from the unit
not inside the unit

It is really not advisable to use any non compatible cleaners/solvents in refrigeration systems, the chemical mix will eventually cause major operational problems.

so why that didnt happen when i installed new compressor after it

[install monkey]

use of vac pump removes air from system- air is 3 physical properties- 1 being oxygen- kaboom
http://en.wikipedia.org/wiki/Atmosphere_of_Earth

[kefah]

thank u all