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Posted By: joe90The inserts go into the compression fitting around the outside of the pipe so they dont reduce the effective bore of the pipe.
Posted By: joe90sorry no! they are inserts for the fitting, you put them in the compression fitting then insert the pipe. They effectively make the OD of the pipe up to the ID of the fitting.
Posted By: JSHarrisAs wookey rightly says, small bore pipe has a lower surface area, so lower heat loss. By the same token, smooth pipe will have a lower surface area than corrugated pipe, so will have lower heat loss.
Posted By: owlmanThe big suppliers PAW, Resol, Meibes all seem to put DN16 fittings on their connecting unions. So I would guess the clue as to which dia pipe to use is there. Perhaps it's because they use standard components, like Grundfoss and Wilo modulating pumps in order to keep the costs of the whole assambly down.
Posted By: JSHarrisI'd suggest that it might be risky to use pipe rated to only 114 deg C, as it would seem that there is a fair chance that this could be exceeded.
Posted By: borpinSurprised in someways that the system does not require to be pressure tested if such extremes can occur.
Posted By: owlman Normally part of the pumpstation, it ejects the glycol into a collecting vessel.
Posted By: wookeyeven if it takes a smidge longer to fit
Posted By: JSHarris...then the volume difference means absorbing an extra 0.03 kWh int the working fluid each time the system starts from cold, or around 11 kWh through the whole year.
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