An analytical study is made of the perforated pipe distributor for the admission of high-energy fluids to a surface steam condenser. The results show that for all perforated pipes there is a general characteristic parameter $MkD/Lf,$ which depends on the pipe geometry and flow properties. Four cases are considered based on the value of the characteristic parameter M. (1) When $M⩾1/4,$ momentum controls and the main channel static pressure will increase in the direction of the streamline. (2) When $1/6⩽M<1/4,$ the momentum effect balances friction losses and the pressure will decrease to a minimum, and then increase in the direction of flow to a positive value. (3) When $0 friction controls and the pressure will decrease to a minimum, then increase slowly, but the total pipe static pressure difference will always be negative. (4) When $M=0,$ a limiting case when the ratio of the length to the diameter is infinite. This analysis is useful not only for the design of perforated pipe distributors for turbine condensers over a wide range of dimensions, fluid properties, and side hole pressure but also for many other technical systems requiring branching flow distribution.

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