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Mr. McElwain, can you check my math and tell me where to find old orifices?
I need to find this orifice (4 of them) and I cannot find a local company who has one, or can find one.
A blank is fine, I can drill it out, but it should be a #26 with what appears to be a 5/16" thread, barrel is 5/8" long and 9/16" wide. Picture attached. This is for an old Climatrol boiler not sure the age, model number: 11W11, serial number: 2 GG. 270000 input 1440 ft^2 water (216,000 btu/h) output. 4 burners, we are at 5300 ft altitude any one who wants to check my orifice sizing? I think a #26 should be correct. Heating a small 5 unit apartment building. Owner wants it to run as well as it can, but does not want to replace it, so we started to tear into the boiler, clean the burners and brush out the sections (wasn't very dirty considering age), replacing the pumps (there are three, all of them are so grossly oversized that when they were all running a conservative estimate based on what I can see for exposed piping and rads they were pushing over 70 gpm through this boiler. I am guessing that the pumps were so oversized they could barely get any delta T across the boiler and the heat took a long time to respond, so someone thought that oversizing the orifices would help the problem and so they drilled them out to #18's. can't fix stupid right? Anyway, I got the burners all cleaned up and the boiler brushed out, new pumps installed only thing I can't find are these orifices. Any help would be appreciated.