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”
 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.
PleaseseetheFlangesandUnionsSectionofthismanualformaximumworkingpressureofpipingsystemsincorporatingthosettingsat
elevated temperatures.
Charlotte Pipe generally recommends socket (solvent cement)
jointing for thermoplastic piping systems. Threaded systems
maybeusedforsmaller-size,low-pressureplasticsystems,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.Schedule40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
ttings.Seepressure/temperaturederatinginformationinthis
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” 235psi 185psi
Unions
Size Socket Type Threaded
Max Working Max Working
Pressure @ 73°F Pressure @ 73°F
Pressure Rating for PVC Schedule 80 Unions