Lecture 4 Tank Volume The Tank Volume To

Lecture 4 Tank Volume

The Tank Volume: �To get the tank volume, we have to get the total hourly demand the hourly pumping. Total Hourly Demand Tank Volume Hourly Pump Flow

The Pump: �The pump will operate 18 hours/ day The pump flow: Let Qtotal in our network = 6392. 035 m 3/day, then �Qpump = Qtotal / #of pumping hours = 6392. 035 / 18 = 355. 11307 m 3/hr Where : Qtotal = ∑ Q for all types of demand at all nodes in the network (m 3/day)

The hourly Pumping �Choose (6) consecutive hours to shut off the pump in the day. �You have to choose hours which has minimum demand to get minimum tank volume.

The total hourly demand: �We have to find the demands per hour in the network using the pattern factors for every type of demand. Q domestic at a given hour = domestic hour factor*Qavg_domestic Q public at a given hour = public hour factor*Qavg_public …. . etc �Find the total demand required at every hour Qtotal at a given hour = Q domestic + Q Public + Q mosque …etc , at the given hour

Domestic Time ( hr ) Pattern Qdomestic m 3/h 1 0. 55 132. 627 2 0. 4 96. 456 3 4 5 6 0. 3 0. 4 0. 35 0. 53 72. 342 96. 456 84. 399 127. 804 7 0. 85 204. 969 8 1. 1 265. 254 9 1. 3 313. 482 10 1. 575 379. 796 11 12 1. 575 1. 5 379. 796 361. 710 School Pattern Qschool m 3/h 0 0 0 1. 32 0. 5148 2. 43 0. 9477 1. 59 0. 6201 4. 86 1. 48 1. 37 1. 8954 0. 5772 0. 5343 Public Pattern Qpublic m 3/h mosque Pattern 0. 0645 1. 548 0 0. 579 1. 287 13. 896 30. 888 0. 6 2. 08 0. 6 0. 89 0. 8045 19. 308 0. 3 0. 8045 19. 308 0. 6 2. 2525 54. 06 0 0. 994 23. 856 0 0. 3 Qmosque Qtotal m 3/h 0 134. 175 0 0. 702 2. 4336 0. 702 1. 0413 98. 004 86. 940 112. 786 115. 989 159. 734 0. 351 225. 143 0. 702 286. 212 0 368. 162 0 0 0. 351 435. 751 404. 229 386. 451

Tank Volume �If (Qtotal – Qpump) > 0 , then water from tank is need. �If (Qtotal – Qpump) < 0 , then water goes to tank. �∑ Q From tank = ∑ Q To tank

Tank Volume: Time ( hr ) 1 Qtotal Qpump Qtotal - Qpump m 3/h 0 134. 175 From tank To tank 134. 175 0 2 98. 004 0 3 86. 940 0 86. 94 0 0 112. 786 112. 7856 0 4 112. 786 5 115. 989 355. 11 -239. 121 0 239. 121 6 159. 734 355. 11 -195. 377 0 195. 3765 7 225. 143 355. 11 -129. 967 0 129. 9672 8 286. 212 355. 11 -68. 898 0 68. 8983 9 368. 162 355. 11 13. 0521 0 10 435. 751 355. 11 80. 6409 0 11 404. 229 355. 11 49. 119 49. 1187 0 12 386. 451 355. 11 31. 3413 0 24

Tank Volume: �Many trials should be made. Choose the most economical tank which has the minimum volume. �An additional volume has to be added to the total volume as a provision for fire or repair. This volume has its own pipes; it means that it is not available for common use. �Vi=∑ Q From tank = ∑ Q To tank So, Tank Volume = 1. 05 * Vi +240

Tank Dimensions: �Assume a tank with 6 -15 m base diameter, then find its height. �Height of tank 5 -10 m. �Max. Height of tank= 10 m

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