Buying Guide
AHEAD OF THE FLOW
®
Revised 4/26/2019
NIBCO INC. WORLD HEADQUARTERS • 1516 MIDDLEBURY ST. • ELKHART, IN 46516-4740 • USA • PH: 1.800.234.0227
TECH SERVICES PH: 1.888.446.4226 • FAX: 1.888.336.4226 • INTERNATIONAL OFFICE PH: +1.574.295.3327 • FAX: +1.574.295.3455
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ABS & PVC piping should be supported just as any other piping
system. Ordinary hanger straps may be used for suspending
below floor systems. The light weight of ABS & PVC may lead
one to believe that wider hanger spacing could be permitted.
Four or five foot spacing is recommended, with proper support
at the base of each stack. CPVC Pressure pipe should be sup-
ported every three feet.
Since ABS, CPVC, & PVC are non-metallic, they are not as
“stiff” as their metal counterparts, therefore the installer must
exercise care to assure proper alignment of required grades.
Branch fittings serving trap arms should also be secured to the
framing to prevent movement. Hanger straps should not be so
tight as to compress, distort, cut, or abrade the piping.
ALLOWING FOR EXPANSION in pressure piping, allowance
for expansion due to changing temperature is important. It
is good practice to include a 12-inch offset every ten feet
in a straight run. Illustrated below are several methods for
providing off sets.
The above data is for un-insulated lines. For insulated lines
reduce spans to 70% of table values. For spans of less than 2
feet continuous support should be used.
Pipe Support Spacing
Specific Gravity Correction Factor
1.1 0.98
1.2 0.96
1.4 0.93
1.6 0.90
2.0 0.85
2.5 0.80
Pipe Support Spacing, ABS-DWV, Ft.
Nominal
Size 70°F 100°F 140°F
1
1
/4 4
1
/2 4
1
/2 4
1
1
/2 5 5 4
1
/2
2 5 5 4
1
/2
3 6 6 5
1
/2
4 6
1
/4 6
1
/4 5
3
/4
6 6
3
/4 6
3
/4 6
8 7 7 6
1
/2
10 7 7 6
1
/2
12 7 7 6
1
/2
Pipe Support Spacing, CPVC-CTS, Ft.
Nominal
Size 70°F 100°F 140°F 180°F
1/2 3 3 2
1
/2 2
1
/2
3/4 3 3 2
1
/2 2
1
/2
1 3 3 2
1
/2 2
1
/2
1
1
/4 4 4 3
1
/2 3
1
/2
1
1
/2 4 4 3
1
/2 3
1
/2
2 4 4 3
1
/2 3
1
/2
Pipe Support Spacing, PVC-Schedule 40, Ft.
Nominal
Size 70°F 100°F 140°F
1/2 4
1
/2 4 2
1
/2
3/4 5 4 2
1
/2
1 5
1
/2 4
1
/2 2
1
/2
1
1
/4 6 5 3
1
1
/2 6 5 3
2 6 5 3
2
1
/2 7 6 3
1
/2
3 7 6 3
1
/2
4 7
1
/2 6
1
/2 4
5 7
1
/2 6
1
/2 4
6 8
1
/2 7
1
/2 4
1
/2
8 9 8 4
1
/2
10 10 8
1
/2 5
12 10 8
1
/2 5
Pipe Support Spacing, PVC-Schedule 80, Ft.
Nominal
Size 70°F 100°F 140°F
1/2 5 4
1
/2 2
1
/2
3/4 5
1
/2 4 2
1
/2
1 6 5 3
1
1
/4 6
1
/2 5
1
/2 3
1
/2
1
1
/2 6
1
/2 5
1
/2 3
1
/2
2 7 6 3
1
/2
2
1
/2 8 7 4
3 8 7 4
4 9 7
1
/2 4
1
/2
6 10 9 5
8 11 9
1
/2 5
1
/2