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Friction Factors and Resistant Coefficients

Friction Factors and Resistant Coefficients

Friction Factors and Resistant Coefficients

(OP)
I am trying to calculate the pressure drop in a hydraulic manifold.  Does anybody know the friction factor for a machined hole (using a hss twist drill)?  All the information I found so far is for pipe.
Does anybody have resistance coefficients for intersecting holes whose axis are offset (don't intersect).  I am mainly looking for 90 Degree bends but other angles would also be useful.  I am assuming the intersection of two machined holes as 90 Degree mitre bend.  If this is not correct, does anybody have any better data?

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