Been There - Left Quick - No Tee Shirt
Hi Andy
There's two rinks a bit south (120km) from you. I visited the less successful of the two a few years back and I have the photo's but releasing them may be a legal issue. Enough to say that your pic is the cleanest rink pack I ever did see.
Until they pulled our local rink down it was typical of the time. Two J.E.Halls compressors running on R22 (lots of it). 2 circulating pumps per pack running almost neat glycol through the rink network.
Compressors were circa 1950 and using 20 to 30 kg of R22 per month. Most had gland problems and dumped oil in a similar way to my old BSA but in a much larger scale say 2-3 lt per day.
The Glycol pumps were almost porous with fluid popping out everywhere and ice build up running back from the rink surface didn't help the seals. The floor was a mess of oil, glycol and icy condensate.
What is amazing is that they still worked at all a credit to the original designers.
To be cost efficient they had to run 18hours a day minimum every day. There was no standby and profits were low, maintenance was on breakdown only. They all knew that the rink would 'dome' eventually.
As to the rink in the south don't bother popping in the plant room for a sneak peek the Dobermans looked very hungry!