What is the best way to design the piping manifold so the flow to each bundle shall be as equal as possible by symmetrical piping only (the operating conditions are 80 deg C and 2 barg).Without seeing it I'd say, 30” O/H line teeing into the centre of a 30 “, or smaller, manifold with 10 “ lines coming off it to the nozzles. Consider provision for butterfly valves or orifice plates on the cooler outlet lines to equalise flow if required. Often the pressure drop in the line is small (if sized correctly) compared to that in the cooler, so even flow distribution is not a problem, as long as the piping is symmetrical. Temperature indicators in/out of each bank would be useful to determine that flow to each bank is relatively even. I might be stating the obvious but I’d recommend a minimal slope on the horizontal sections of the 30 “ line to allow any condensate to drain back to the vessel/to the cooler, and obviously no pockets.

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