![]() Where sections of the piping serve more than one hose bibb, each additional hose bibb adds a demand of 1.0 WSFU to those sections of the piping. Where a section of piping serves a single hose bibb, it adds a demand of 2.5 WSFU.These values are obtained from Table B.5.4, using the columns for flush-tank systems 1. The maximum probable demand in gpm is marked on the drawing for each section next to the WSFU values.Many designers use parentheses marks for WSFU to distinguish them from gpm values. These values are obtained from Tables B.5.2 and B.5.3. The water supply fixture unit (WSFU) loads are marked on the drawing next to each section of the system.After the information is known, the isometric drawing (Figure B.8.1) is marked up with general water supply information, and the mains, risers, and branches are suitably identified. ![]()
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