After watching Dan's near boiler piping video last week, it reminded me of a few questions we had about our single-pipe steam system for our 5 unit apartment building in Milwaukee, WI.
I was going through old photos of the Weil McLain EGH85 steam boiler we replaced in fall 2015 with our new WM EG75, and have some of the old EGH85 boiler photos attatched for comments. Our observations & questions about the old boiler setup are:
1. We thought the intake for combustion air in the boiler room's window was too small for the old boiler from CFM/BTU calculations by 30-50%, so we increased the size with our new boiler install & added a 50% extra margin of safety.
2. The old boiler was directly on the floor of the boiler room (our new one has some bricks under it), and had a lot of rust on the bottom of the jacket/was rusty inside when we removed it per the photos.
Would the under-supply of intake combustion air and/or running for a shorter period of time if oversized cause the rust buildup we saw on the old EGH85 boiler over its 20-25 year life in there? We had just replaced the water supply piping in the 3rd photo a few weeks before these pictures were taken, since it had been leaking & was all rusty/corroded. It almost seemed like there were water leaks or flooding in the boiler room to cause that much rust on the boiler over time, compared to how our 5 year old boiler is looking so far. Any thoughts about how all that rust got there, or is this pretty typical for an old boiler?