Technical Details

Friction

 

Selection Of Pipe and Installation Tips :-

 

2016-01-06 13_21_43-file for website correction 26122015 [Compatibility Mode] - Excel

 

 

 

 

 

Column Pipe Type  Pipe Size Pipe size, mm Submersible Pumps size
Crystal 1″,  1¼”, 1 ½” 25, 30, and 40 Upto 100mm sub. Pump
Medium 2″ 2½”, &  3″ 50, 65 and 80 Upto 150mm sub. Pump
3″, 4″ 80, 100 Upto 200mm sub. Pump
Standard 1″,  1¼”, 1 ½” 25, 30, and 40 Upto 100mm sub. Pump
 1¼”, 1 ½”,  2″ &  2½” 30, 40, 50, and 65 Upto 150mm sub. Pump
3″, 4″ 80, 100 Upto 200mm sub. Pump
Heavy  1¼”, 1 ½”,  2″, 2½”, & 3″ 30, 40, 50, 65, and 80 Upto 150mm sub. Pump

 

 

Typical Technical Load Chart

 

Technical comparison for load on the top pipe and breakage load of Finolex standard pipes are given in following table. Details given below are just an indication of the loads to explain that in the design of pipes, adequate factors of safety have been considered.

 

Pipe Size Approx Weight  of Column pipes for 150m (500ft) (in kg) Approx Weight  of water in 150m ( 500ft) column pipe (in kg) Approx weight of pump (maximum) in kg Total weight (in kg) Ultimate Breaking Load of Column pipe (in kg)
25MM  (1″) 85 75 100 260 1800
32MM  (1 1/4″) 125 135 100 360 2600
40MM  (1 1/2″) 145 190 125 460 3000
50MM  (2″) 185 320 150 655 3800
65MM  (2 1/2″) 255 530 200 985 5000
80MM  (3″) 370 720 250 1340 7000
100MM  (4″) 450 1225 300 1975 10300

 

Note:- The total weight of the assembly is considerably reduced due to buoyancy (ability to float in water) when immersed in bore-well water. (In above details this is not considered.)

 

The friction head in pipe is directly proportional to the length of pipe and inversely proportional to diameter. The delivery head is to be worked out first. The vertical distance between  suction level and delivery level, the length and diameter will decide head loss (friction loss) in pipes.

 

Nominal Bore/Size Type Discharge of Pump in LPM
40 60 80 100 120 150 180 240 300 360 400 500
25MM  (1″) CRYSTAL 3.781 8.012 13.65 20.635 28.923 43.725 61.288 104.414 157.848 221.249 268.922 406.539
25MM  (1″) STANDARD 6.479 13.738 23.39 35.374 49.562 74.936 105.045 178.921 270.519 379.213 460.91 696.688
32MM  (1 1/4″) CRYSTAL 1.064 2.255 3.842 5.809 8.142 12.308 17.253 29.393 44.435 62.283 78.703 114.443
32MM  (1 1/4″) STANDARD 1.477 3.132 5.333 8.066 11.301 17.087 23.952 40.798 61.684 86.469 105.098 158.861
32MM  (1 1/4″) HEAVY 2.071 4.392 7.477 11.309 15.845 23.957 33.583 57.201 86.485 121.234 147.353 222.732
40MM  (1 1/2″) CRYSTAL 0.525 1.113 1.896 2.866 4.018 6.074 8.513 14.504 21.927 30.735 37.357 56.474
40MM  (1 1/2″) STANDARD 0.662 1.404 2.391 3.616 5.067 7.661 10.74 18.293 27.659 38.773 47.126 71.233
40MM  (1 1/2″) HEAVY 1.058 2.243 3.818 5.775 8.091 12.233 17.149 29.21 44.164 61.909 75.246 113.739
50MM  (2″) STANDARD 0.185 0.392 0.667 1.009 1.414 2.138 2.998 5.105 7.719 10.821 13.152 19.881
50MM  (2″) HEAVY 0.245 0.52 0.885 1.339 1.876 2.837 3.978 6.775 10.244 14.36 17.453 26.382
65MM  (2 1/2″) STANDARD 0.054 0.114 0.194 0.293 0.411 0.621 0.87 1.482 2.241 3.141 3.818 5.771
65MM  (2 1/2″) HEAVY 0.077 0.163 0.227 0.419 0.588 0.888 1.245 2.121 3.207 4.496 5.464 8.259
80MM  (3″) STANDARD 0.025 0.053 0.091 0.138 0.193 0.291 0.408 0.696 1.052 1.475 1.792 2.709
80MM  (3″) HEAVY 0.034 0.072 0.123 0.187 0.261 0.395 0.554 0.943 1.426 1.999 2.43 3.673
100MM  (4″) STANDARD 0.007 0.015 0.025 0.038 0.053 0.08 0.112 0.199 0.287 0.403 0.489 0.74
100MM  (4″) HEAVY 0.01 0.021 0.036 0.054 0.076 0.115 0.161 0.275 0.415 0.582 0.708 1.07

Approx, frictional head lost in steel pipe head lost in m. per 100m discharge in lpm.

 

Pipe Nominal Bore
Q Imp (Nominal Dia mm) 40 50 65 80 100
Discharge in lpm 40 1.15 0.38 0.10 0.03 0.01
60 2.57 0.84 0.22 0.08 0.03
80 4.58 1.50 0.40 0.14 0.05
100 7.16 2.36 0.63 0.22 0.07
120 10.30 3.38 0.91 0.32 0.11
150 16.10 5.30 1.42 0.50 0.17
180 23.20 7.60 2.05 0.72 0.24
240 41.25 13.52 3.64 1.29 0.42
300 64.45 21.12 5.69 2.01 0.66
360 30.41 8.19 2.90 0.95
400 37.55 10.11 3.58 1.17
500 15.80 5.59 1.83

 

Friction in long pipelines, is to be calculated by using the above given technical charts of friction losses per 100meter. From above tables it can be seen that higher diameter pipes have lower frictional head loss, this helps to reduce load on pump and thus increase its life.

Calculations

 

Head loss and discharge comparison for 50mm ( 2″ ) Finolex heavy column pipe and GI pipe for installation at 137m (450 ft )  depth

(i) Head Loss due to depth of pump = 137meters= 450ft both in case of Finolex column pipe and steel pipe.

(ii) Ref above Technical charts for head loss due to friction for both pipes

Taking working range of discharge as 18m3/hr

18m3/hr = 300lpm

a) For 50mm (2″) Heavy Finolex Column Pipe Frictional Head Loss is = 10.244 mtrs / 100mtr

For 137 mtrs frictional head loss  = ( 137 / 100) x 10.244 = 14.034 meters

Total Head Load on pump with Finolex  Column Pipe = 137+14.034= 151.03 meters

b) Head Loss due to friction in Steel Pipes

As per chart for steel Pipe 21.12 meters  /100 meters

For 137 meters frictional head loss = (137/100) x21.12 = 28.93 meters

Total Head Load on pump with Steel Pipe = 137+ 28.93= 165.93 meters

From the above two calculations for Finolex column pipes and steel pipes, different head load are shown on pump in the same working conditions. As per pump chart 10% to 30% extra water discharge is available with Finolex Column Pipe in comparison to steel pipes depending upon depth and discharge of pump. This means huge power saving and reduced pumping time.

 

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