PRESSURE LOSS IN PIPE SYSTEMS OUT OF PLASTIC Pressure loss coefficients for fittings and molded parts made of PVC U and ABS

In hydraulic pipeline calculations pressure loss coefficients are necessary for the calculational determination of fittings. The pressure losses resulting from friction-, deflection- and separation losses play a considerable part in the total pressure loss of a pipe system. In order to determine the pressure loss in fittings as easily as possible, in the annex "pressure loss coefficients for PVC-U / C and ABS fittings" are shown in meter/fitting. When calculating the pressure loss of the individual pipe length, these values have to be considered as equivalent length of the straight pipe length LR. Pressure losses in straight pipe runs are calculated as follows: If for certain fittings no pressure loss coefficients are available, the following calculation formula can be taken as a basis The Zeta values can be read in the usual charts.

PRESSURE LOSS IN FITTINGS - Indication in meter equivalent pipe / fitting -

PVC-U / PVC-C Fittings ABS Fittings d 90° Elbow 45° Elbow 90° Bend Tee (1) Tee (2) 90° Elbow 45° Elbow 90° Bend Tee (1) Tee (2) 16 0,40 0,10 0,10 0,10 0,80 0,39 0,13 0,13 0,13 0,78 20 0,50 0,10 0,10 0,10 1,00 0,50 0,17 0,17 0,17 1,01 25 0,70 0,15 0,20 0,20 1,30 0,64 0,21 0,21 0,21 1,27 32 0,90 0,20 0,20 0,20 1,80 0,83 0,28 0,28 0,28 1,67 40 1,10 0,40 0,30 0,30 2,20 1,04 0,35 0,35 0,35 2,08 50 1,30 0,50 0,40 0,40 2,80 1,30 0,43 0,43 0,43 2,59 63 1,80 0,80 0,50 0,50 3,60 1,64 0,55 0,55 0,55 3,28 75 2,00 0,90 0,70 0,70 4,30 1,95 0,65 0,65 0,65 3,90 90 2,40 1,10 0,80 0,80 5,10 2,34 0,78 0,78 0,78 4,68 110 3,00 1,30 1,00 1,00 6,30 2,86 0,95 0,95 0,95 5,72 125 2,50 1,50 1,20 1,20 7,40 3,26 1,09 1,09 1,09 6,52 140 2,90 1,80 1,30 1,30 8,30 3,64 1,21 1,21 1,21 7,28 160 4,50 2,00 1,50 1,50 9,60 4,17 1,39 1,39 1,39 8,34 180 5,00 2,00 1,70 1,70 10,70 5,40 1,80 1,80 1,80 10,80 200 5,60 2,50 1,90 1,90 11,90 5,21 1,74 1,74 1,74 10,42 225 6,20 2,80 2,10 2,10 13,40 5,86 1,95 1,95 1,95 11,72 250 6,90 3,10 2,30 2,30 14,80 6,53 2,18 2,18 2,18 13,07 280 7,80 3,50 2,70 2,70 16,80 8,40 2,80 2,80 2,80 16,80 315 8,70 4,00 3,00 3,00 18,80 8,20 2,73 2,73 2,73 16,40   (1) Volume flow in the passage direction (2) Volume flow from the outlet in the passage direction The equivalent pipe lengths of the molded parts are to be added to the straight total pipe length during the pressure loss calculation. The resistance coefficients for PE and PP molded parts can be requested from us if necessary.

Pressure drop in PVC U pipelines, pressure stage PN 16, medium: water 20°C

d 75 X 5,6 d 90 x 6,7 d 110 x 8,2 d 125 x 9,3 d 140 x 10,4 Q [l/s] V [m/s] delta p [bar/100m] V [m/s] delta p [bar/100m] V [m/s] delta p [bar/100m] V [m/s] delta p [bar/100m] V [m/s] delta p [bar/100m] 0,16 0,050 0,0009                 0,2 0,063 0,0014                 0,25 0,078 0,0020 0,054 0,0008             0,315 0,099 0,0029 0,068 0,0012             0,4 0,125 0,0044 0,087 0,0019 0,058 0,0007         0,5 0,156 0,0065 0,108 0,0027 0,073 0,0011 0,056 0,0006     0,63 0,197 0,0097 0,137 0,0041 0,092 0,0016 0,071 0,009 0,056 0,0005 0,8 0,250 0,0148 0,174 0,0062 0,116 0,0024 0,090 0,0013 0,072 0,0008 1 0,313 0,0218 0,217 0,0091 0,145 0,0035 0,112 0,0019 0,090 0,0011 1,25 0,391 0,0323 0,271 0,0135 0,182 0,0052 0,141 0,0028 0,112 0,0017 1,6 0,500 0,0499 0,347 0,0208 0,233 0,0080 0,180 0,0044 0,143 0,0025 2 0,626 0,0741 0,423 0,0309 0,291 0,0119 0,225 0,0064 0,179 0,0038 2,5 0,782 0,1102 0,542 0,0459 0,363 0,0176 0,281 0,0095 0,224 0,0056 3,15 0,985 0,1665 0,684 0,0692 0,458 0,0265 0,354 0,0144 0,282 0,0083 4 1,251 0,2555 0,868 0,1060 0,581 0,0405 0,450 0,0219 0,358 0,0127 5 1,564 0,3819 1,085 0,1582 0,727 0,0603 0,526 0,0326 0,448 0,0189 6,3 1,971 0,5802 1,367 0,2398 0,916 0,0913 0,709 0,0493 0,565 0,0286 8 2,502 0,8958 1,736 0,3693 1,163 0,1403 0,900 0,0757 0,717 0,0438 10 3,128 1,3466 2,170 1,453 0,2099 1,125 0,1131 0,1131 0,896 0,0654 12,5     2,712 0,8319 1,817 0,3146 1,406 0,1692 1,120 0,0978 16     3,472 1,3078 2,325 0,4931 1,799 0,2649 1,434 0,1529 20         2,907 0,7416 2,249 0,3977 1,792 0,2293 25             2,812 0,5982 2,240 0,344 31,5                 2,823 0,5258   Subject to technical modifications, all data without guarantee

The above listed values and charts are an excerpt. Detailed calculations you will find under the following link: pressure loss in pipelines

Layout of plastic pipe systems - Flow calculation - In our drop-down menu "ONLINE-TOOLS", next to the article description, you will find a link to the flow calculation of plastic pipelines. For a rough planning of your project, this function is very helpful.

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