Steel pipe hanger spacing is dependent on pipe size and type. For branch lines, a single section of steel pipe may not require a hanger, as long as the cumulative distance between hangers doesn't exceed the maximum spacing requirement. When calculating cumulative distance, changes in horizontal direction are included. Table 9.2.2.1(a) provides maximum distance requirements between hangers in feet and inches, while Table 9.2.2.1(b) uses metric measurements. The distance between a hanger and the centerline of an upright sprinkler must be no less than 3 inches.

CPVC pipe hanger spacing is addressed in Table 9.3.6.4(b), which provides the maximum spacing of restraints for CPVC, based on pipe size (inches and millimeters) and seismic coefficient (Cp).

The sources include a variety of illustrations to help the reader visualize hanger types, placement, and spacing. For example, Figure A.9.2.3.2.2 illustrates the distance between hangers on branch lines, and Figures A.9.3.5.7.2 and A.9.3.5.9 illustrate brace locations on mains with changes in direction.

For additional information on hanger types, characteristics, and applications, see Category 8 in the source.