Hartford loop

Hartford loop

[′härt·fərd ‚lüp]
(mechanical engineering)
A condensate return arrangement for low-pressure, steam-heating systems featuring a steady water line in the boiler.

Hartford loop, Underwriters’ loop

An arrangement of the return piping connections to a steam boiler; used to balance pressures between the supply and return sides of the boiler and thus prevent boiler water from backing out of the boiler and into the return.
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References in periodicals archive ?
The Hartford Loop piping around the boiler was developed to keep the waterline in the boiler high enough to avoid damage.
The Hartford Loop consists of an equalizing pipe connecting the steam header to the condensate inlet at the bottom of the boiler.
Experienced builders will use a Hartford loop with a vacuum breaker on all vanishing-edge projects.
Hartford loops are also used in spas to keep water from seeping in the air lines.

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