Sizing circulators for head loss on pipe distance?

wcs5050

With heat exchangers and coils I understand friction head loss and how to combat it with correctly sized pump, but what about pipe distance. Upcoming job has boiler at far end of 100 ft building, serving 2 stories. I’ve never concerned myself with friction head loss due to distance but this one makes me curious if alteration of my pump provision should be made. Zone is 1-1/4 commercial fin tube.

hot_rod

Correct you are. You would need to define the piping circuit, know the flow rate to come up with head. In an existing building it may not be possible to see all the piping. Some of the pump manufacturers add a fudge factor to cover system piping in pump sizing.

This issue give you the info to help better define that.

In a single circulator system you define the highest head circuit.

If the building has multiple zones or units with fan coils a delta P circulator is a nice option to modulate flow based on changing loads.

https://www.caleffi.com/sites/default/files/coll_attach_file/idronics_16_na_0.pdf