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I find in various design guides references to the distance between the circulator, branch fittings and 90 degree fittings. But in practice what I see is components placed as close together as possible. This is particularly true in some of the integrated component structures where mounting flanges, tempering valves, check valves and branch fittings are all cast into a single component and designed to attach directly to a circulator.
An example is a design guide that says branches should be no closer than 8 pipe diameters from the circulator outlet, 90 degree fittings should be no closer than 6 pipe diameters from a circulator or branch, etc.
So which is it: Make it compact or follow the design guide? If the answer is follow the guide, then why do the compact designs work?