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Note 1: this
is the outside diameter, not the nominal bore
Note 2: flanges count as equivalent to 0.5 metres of pipe; valves,
strainers and the like count as 1.0 metre
Note 3: bare pipe loss is subject to a very wide margin of error. It is
affected by surface finish, orientation, proximity to surfaces or other hot
pipework, and prevailing air velocities.
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