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Rad pipe minimum slope - Settled floor
My question is:
- could the lack of consistent slope in the return piping be the cause of a lack of flow across a radiator
- is 1/2" slope over 14' enough to account for the inconsistencies that might arise in the pex pipe expanding or drooping over time?
100+ yr old CI radiators. old gravity system, now with circulator pump. It was extended onto a porch which had settled quite a bit. Hot water supply was getting to the radiator, but didn't seem to be flowing through as only the coupling and first section would get warm. Piped bottom-to-bottom. after plenty of pondering, I realized that the return has the farther run and due to settling, was now pitched up to where the pipe connected through a wall before dropping down back to the main system. The pipes are running through shallow sleepers on top of concrete slab. I had to replace the wood flooring so once done, the pipes will be inaccessible again.
I replaced the iron pipe with pex and with a lot of work I was able to get a fairly consistent, but very minor slope into the return pipe. It is only about 1/2" over 14' I tried to secure shims and channel the pex in foam insulation to allow for expansion, but not drooping.
the only other option I can think of is daylighting the pipe earlier above the floor and piping exposed around the back of the rad to the return spud.
Thanks for any comments!!