Ammonia purging

[Grizzly]

The below diagram is from a 1973 J&E Hall Info / defect Bulletin.

Stating that in order to eliminate the possibility of introducing water into the compressor.
Because as the pressure inside the crankcase of the compressor falls to ambient. The rate of absorption reduces the pressure in the crankcase very rapidly
and water will enter the crankcase. (Yep been there!)

The preferred solution is outlined below:-




Explanation:-
The gas should be vented into an enclosed vessel with a further outlet into a water container.
The amount of water in the container would be less than that required to fill the enclosed vessel. This would then make it impossible for water to enter the crankcase.

I have seen this type of arrangement recommended before but as yet don't know of anyone that applies it.
Does anyone actually use anything like this out in the field?
Grizzly

PS hopefully the diagram is not to small for anyone to see? If it is left click on it and you will be redirected to a larger image!
Just trying a newly recommended way of attachment.

[Magoo]

What a load of old rope. They at J&E H., had stars in there eyes obviously. No wonder they pailed into oblivion.

[pavilion]

Yep been there too!! I worked for Halls for many many years & this method was never used, infact we were never encouraged to use it. Suppose they had to print something in their manuals

[RANGER1]

From my experience it only happens to you once in your career , unless you are a bit thick .
Hopefully you get away with it not causing to much drama .
Usually only happens when you turn off a hot compressor .
Even if it is a good idea its something else you have to carry around .

[Grizzly]

From my experience it only happens to you once in your career , unless you are a bit thick .
Hopefully you get away with it not causing to much drama .
Usually only happens when you turn off a hot compressor .
Even if it is a good idea its something else you have to carry around .

Wise words Ranger,
Yep as you say I only did it once and then in my defence. I left a isolated compressor purging whilst being called away to an "emergency". On another site 30 mls away.
Fortunatley I was purging a RC6311 to do a full overhall.
So I had plenty of oppertunaty to dry it back out properly!
As you say yet more to carry.
Maggo, you could be correct. But back in those day they (J&E Hall) Had Ice Cream, Brewery Divisions etc.
So they were large enough to fall fowl of the corporate bull **** that prevails in the larger comnpanies nowadays!
What really killed Halls was fighting a hostile take over bid by Hanson Group ( but that's another story!)
Pavillion.
Bristol or Plymouth?
Thanks for the input guys, I guess No body uses this type of system anywhere?
Grizzly

[monkey spanners]

Could you not just have a check valve in the purge hose?

Not that i know anything about ammonia, i've only ever seen three ammonia comps, and that was in the 80's at the MMB depot in Felin Fach.

Jon

[pavilion]

Hi Grizzly

I worked out of the Birmingham branch until 2004 when they centralised to Derby, didnt fancy that so threw the towel in, how about you have you worked for Halls?

Pavilion

[Grizzly]

Hi Pavilion.
Yep I used to work for Bristol latterly helping out on marine through Plymouth.
Which I loved, but hated the commute.
Hate won over love eventually!
Grizzly
PS I did not realise that Blue Yonder was in the midlands?
Or maybe it isn't?

[alan wolf]

Hi

also ex Halls but back in 70s

used clear hose to see purging.

isolate quick when water started reverse travel.

Al