How to Guide
97
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”
PVCSch.40 300 264 225 186 150 120 90 66 NR
PVCSch.80/CPVCSch.80 425 374 319 264 213 170 128 94 NR
3/4”
PVCSch.40 240 211 180 149 120 96 72 53 NR
PVCSch.80/CPVCSch.80 345 304 259 214 173 138 104 76 NR
1”
PVCSch.40 225 198 169 140 113 90 68 50 NR
PVCSch.80/CPVCSch.80 315 277 236 195 158 126 95 69 NR
1-1/4”
PVCSch.40 185 163 139 115 93 74 56 41 NR
PVCSch.80/CPVCSch.80 260 229 195 161 130 104 78 57 NR
1-1/2”
PVCSch.40 165 145 124 102 83 66 50 36 NR
PVCSch.80/CPVCSch.80 235 207 176 146 118 94 71 52 NR
2”
PVCSch.40 140 123 105 87 70 56 42 31 NR
PVCSch.80/CPVCSch.80 200 176 150 124 100 80 60 44 NR
3”
PVCSch.40 130 114 98 81 65 52 39 29 NR
PVCSch.80/CPVCSch.80 185 163 139 115 93 74 56 41 NR
4”
PVCSch.40 110 97 83 68 55 44 33 24 NR
PVCSch.80/CPVCSch.80 160 141 120 99 80 64 48 35 NR
6” PVCSch.40 90 79 68 56 45 36 27 20 NR
Note:ThreadingofPVCSchedule40andCPVCSchedule80pipeisnotrecommended.
Threadingpipeover4”indiameterisnotrecommended.
PleaseseetheFlangesandUnionsSectionofthismanualformaximumworkingpressureofpipingsystemsincorporatingthosettingsat
elevated temperatures.
Charlotte Pipe generally recommends socket (solvent cement)
jointing for thermoplastic piping systems. Threaded systems
maybeusedforsmaller-size,low-pressureplasticsystems,if
desired. Transitions to metal or other dissimilar materials may
be completed using molded male or female threaded adapters
or cut threads on Schedule 80 pipe or flanges.
Only Schedule 80 PVC and Schedule 80 CPVC pipe can be
threaded.Schedule40orSDRpipecannotbethreaded;molded
threaded adapters must be used on those systems.
The pressure rating of molded or cut threads must be derated
byanadditional50%beyondthepressureratingforpipeand
ttings.Seepressure/temperaturederatinginformationinthis
technical manual for systems exposed to operating conditions
above 73°F.
INSTALLATION PROCEDURES
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
1
⁄2
”
235 psi 235 psi
3
⁄4
”
235 psi 235 psi
1
”
235 psi 235 psi
1
1
⁄4
”
235 psi 235 psi
1
1
⁄2
”
235 psi 235 psi
2
”
235 psi 200 psi
3” 235psi 185psi
Unions
Size Socket Type Threaded
Max Working Max Working
Pressure @ 73°F Pressure @ 73°F
Pressure Rating for PVC Schedule 80 Unions