Modified Graphical Determination of Submain Size

Abstract

ABSTRACT THE pressure distribution in a multiple-outlet tapered pipe descending a non-uniform slope was determined graphically by DeTar (1975). His procedure enabled one to select the proper pipe size and the location for changes in pipe size. A table of multipliers was a key element in the procedure. This new article presents a simplified method for obtaining these multipliers for a variety of pipe types and for any number of outlets. The procedure involves the use of the correction factor commonly used in sprinkler lateral design; a table of three correction fac-tors is given.