The handbook of Technical irrigaTion informaTion - Hunter Industries

TablesPVC Schedule 40 and Schedule 80 Pipe and Injection MoldedFittings Suggested Maximum Internal Pressure RatingsPressure Rating (PSI) at 73.4°F (23°C)Nominal SizePipeSuggested PVC Pipe and Injection Molded Fittings Internal Pressure RatingsSchedule 40 Schedule 80SolventCemented Joint Threaded Joint PipeSolventCemented JointThreaded Joint½" 596 358 179 848 509 254¾" 482 289 144 688 413 2061" 450 270 135 630 378 1891¼" 368 221 110 520 312 1561½" 330 198 99 471 282 1412" 277 166 83 404 243 1212½" 304 182 91 425 255 1273" 263 158 79 375 225 1123½" 240 144 72 345 207 1034" 222 133 66 324 194 976" 177 106 53 279 167 838" 155 93 46 246 14810" 141 150 234 20012" 132 150 228 200This table is for use as a general guide only. Actual Internal Pressure Ratings may vary widely with field conditions.Elevated operating temperatures will necessitate a devaluation of the above ratings.Note:Historically, manufactures have assumed that fittings have the same internal pressure rating as pipe.A recent engineering study* by Keller-Bleisner Engineering of Logan, Utah, indicates that while thefittings do meet the minimum burst requirements of pipe, actual operating conditions may require adevaluation of the internal pressure rating for fittings. The devaluation is due to the applied stressloads to the fitting caused by the operating parameters of the system. The maximum internal pressureratings are admittedly based on limited data but it is most resent study pertaining to fitting internalpressure ratings.*The above study was funded by Dura, Eslon, LCP, Lasco, Nibco, R&G Sloane, and Spears.67