How to Guide

45
Pressure Rating (PSI) @
Size Type 73 °F 80 °F 90 °F 100 °F 110 °F 120 °F 130 °F 140 °F 150 °F
1/2”
PVC Sch. 40 300 264 225 186 150 120 90 66 NR
PVC Sch. 80 / CPVC Sch. 80 425 374 319 264 213 170 128 94 NR
3/4”
PVC Sch. 40 240 211 180 149 120 96 72 53 NR
PVC Sch. 80 / CPVC Sch. 80 345 304 259 214 173 138 104 76 NR
1”
PVC Sch. 40 225 198 169 140 113 90 68 50 NR
PVC Sch. 80 / CPVC Sch. 80 315 277 236 195 158 126 95 69 NR
1-1/4”
PVC Sch. 40 185 163 139 115 93 74 56 41 NR
PVC Sch. 80 / CPVC Sch. 80 260 229 195 161 130 104 78 57 NR
1-1/2”
PVC Sch. 40 165 145 124 102 83 66 50 36 NR
PVC Sch. 80 / CPVC Sch. 80 235 207 176 146 118 94 71 52 NR
2”
PVC Sch. 40 140 123 105 87 70 56 42 31 NR
PVC Sch. 80 / CPVC Sch. 80 200 176 150 124 100 80 60 44 NR
3”
PVC Sch. 40 130 114 98 81 65 52 39 29 NR
PVC Sch. 80 / CPVC Sch. 80 185 163 139 115 93 74 56 41 NR
4”
PVC Sch. 40 110 97 83 68 55 44 33 24 NR
PVC Sch. 80 / CPVC Sch. 80 160 141 120 99 80 64 48 35 NR
6” PVC Sch. 40 90 79 68 56 45 36 27 20 NR
Note: Threading of PVC Schedule 40 and CPVC Schedule 80 pipe is not recommended.
Threading pipe over 4” in diameter is not recommended.
Threaded Joints and Threading of PVC and
CPVC Pipe
Do not exceed the maximum working pressure of any
system components including pipe, fittings, valves, molded
or cut threads, unions, mechanical coupling or flanges.
• The pressure rating of all components must be reduced at
temperatures above 73 degrees F. Refer to de-rating table
in this manual.
• Exceeding the maximum working temperature or
pressure of the system may result in system failure and
property damage.
Maximum Pressure Rating for PVC and CPVC Piping Systems With Threaded Fittings or
Threaded Pipe in Pressure Applications
DESIGN & ENGINEERING DATA
Only Schedule 80 PVC pipe can be threaded. Schedule 40,
Schedule 80 CPVC or SDR pipe cannot be threaded; molded
threaded adapters must be used on those systems.
The pressure rating of molded or cut threads must be derated
by an additional 50% beyond the pressure rating for pipe and
fittings. See pressure/temperature derating information in this
technical manual for systems exposed to operating conditions
above 73°F.