The static pressure measurement error at a wall tap of a flow nozzle is examined for a wide range of
Reynoldsnumber.The static pressure measurement error is obtained using the measured discharge
coefficient for the flow nozzle.The static pressure measurement error is influenced by the diameter of
the wall tap and the viscosity of the working fluid. This paper presents several relations between the
static pressure measurement error normalized by the wall shear stress and the tap Reynolds number,
which is based on the diameter of the wall tap and the friction velocity.The best relation to reasonably
explain the static pressure measurement error is proposed in this paper.