Manhole Sizing
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Minimum Circumferential Clearances
Required
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| REINFORCED
CONCRETE PIPE |
| PIPE
SIZE |
WALL B |
WALL C |
| O.D. |
O.D. |
| 12" |
16" |
18" |
| 15" |
19 1/2" |
21" |
| 18" |
23" |
24 1/2" |
| 21" |
26 1/2" |
28" |
| 24" |
30" |
31 1/2" |
| 27" |
33 1/2" |
35" |
| 30" |
37" |
38 1/2" |
| 33" |
40 1/2" |
42" |
| 36" |
44" |
45 1/2" |
| 42" |
51" |
52 1/2" |
| 48" |
58" |
59 1/2" |
| 54" |
65" |
66 1/2" |
| 60" |
72" |
73 1/2" |
| 66" |
79" |
80 1/2" |
| 72" |
86" |
87 1/2" |
| 78" |
93" |
94 1/2" |
| 84" |
100" |
101 1/2" |
| 90" |
107" |
- |
| 96" |
114" |
- |
| 102" |
121" |
- |
| 108" |
128" |
- |
| 120" |
142" |
- |
|
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| MAX.
PIPE SIZE OF RCP |
| MANHOLE
DIA. |
FROM
STRAIGHT THRU TO 135° ANGLE |
IF 90°
ANGLE |
IF 180°
ANGLE |
| 48" |
24" RCP |
18" RCP |
24" RCP |
| 60" |
33" RCP |
27" RCP |
33" RCP |
| 72" |
36" RCP |
33" RCP |
36" RCP |
| 84" |
48" RCP |
36" RCP |
48" RCP |
| 96" |
54" RCP |
42" RCP |
54" RCP |
| Chart
to be used to determine manhole sizing. |
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