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Preparing old radiators for hot water
In advance, I am NOT converting my house from steam to hot water!
I am replacing my old forced hot air system with a gas fired hot water system and old radiators. I will probably ask more questions but for now I am refurbishing the radiators which were recently removed from a working system.
The radiators are tube type (4 and 5 tube). 4 are Gurney Copley and one is an American Radiator model. They all have one inlet open (fitting removed) with three more ports plugged.
Although they came from a working system I don’t want to assume that they don’t leak. There is plenty of references on the web about pressure testing them in place but I need to test them standing by themselves, in my back yard. How can I test them in my yard? The obvious easy way is to put fittings together to leak check them with a garden hose, for a few hours. My house is two stories so the system pressure will be around 12 PSI if what I’ve found so far is correct. The water pressure in my house was 52PSI the only time it was ever checked.
What’s the best location for the outlet fitting if the inlet is on the bottom? It makes sense to me that the outlet should be on the top of the opposite end but there may be factors that I am not aware of.
As I expected the large plugs have become one with the radiators. Before I chase down a big enough torch to heat the area enough to free the plugs, I would like to try an impact wrench. Not having done much work with cast iron, is this safe? As in, can cast iron crack under the impact?
Inspection with a flashlight shows some surface rust and I understand there may be sediment in the bottom. Should I fill them with a TSP solution for a few days and flush them out then neutralize them? Or?