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HYDROPNEUMATIC TANK SIZE CALCULATION Important information required for hydro-pneumatic tank sizing (a) Cut in pressure (b) Cut out pressure (c) Average capacity (d) Motor sizing (to determine no(s) of allowable start/stop per hour Hydropneumatic Tank Size Effective system protection Average capacity Average pressure Average time taken to fill up tank Example = = = Effective System Protection Drainage Volume Average Capacity x Average time taken to fill up tank Capacity @ average pressure point (cut in + cut out) 2 ½ of total time assuming worst scenario of maximum no(s) of start stop occurs If system consist of 2 no(s) of DOL starting pump, the allowable start stop per pump shall be 20 times, thus for the system, the allowable start/stop shall be 40 times. (because system is design to lead-lag) Allowable no(s) of start stop is based on one (1) hour rate, thus, one cycle of start/stop at worst situation is = 60 minutes / 40 minutes = 1.5 minutes In this cycle, if we assume that the capacity of the tank is an amount which only be filled up / drained off in ½ T then the tank size is sufficient to serve as a buffer for that particular system. so, half T = 1.5 min/2 = 0.75 min Drainage Volume = 1 CUT IN PRESSURE (psi) + 14.5 . CUT OUT PRESSURE (psi) + 14.5

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HYDROPNEUMATIC TANK SIZING (Guide for 2 pumps system) Analysis on flowrate Vs Hydro-pneumatic tank sizing Note: Hydropneumatic tank size is designed based on the following information. (A) Two (2) no(s) of Pump (B) System is running on a differential pressure of 10 m (C) No(s) of allowable start/stop per hour is based on; Motor Size Motor below 2.2 kW Motor from 3 ­ 7.5 kW 11 kW and above Results Maximum Capacity Cut in 10 m Cut in 15 m Cut out 20 m Cut out 25 m 29 igpm 22 igpm 48 igpm 36 igpm 97 igpm 73 igpm 146 igpm 110 igpm 73 igpm 146 igpm 97 igpm 220 igpm 146 igpm 293 igpm 195 igpm 367 igpm 244 igpm 25 igpm 18 igpm 42 igpm 31 igpm 84 igpm 63 igpm 126 igpm 94 igpm 63 igpm 126 igpm 84 igpm 189 igpm 126 igpm 251 igpm 168 igpm 315 igpm 210 igpm Type of Starter (based on motor size) DOL Star Delta DOL Star Delta DOL Star Delta DOL Star Delta Auto Transformer Star Delta Auto Transformer Star Delta Auto Transformer Star Delta Auto Transformer Star Delta Auto Transformer 2000 Litre 1500 Litre Recommended Hydro-pneumatic tank capacity 300 Litre Type of Starting DOL Star Delta Auto-Transformer Maximum nos. of start/stop per hour 20 15 10

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HYDROPNEUMATIC TANK SIZING (Guide for 3 pumps system) Analysis on flowrate Vs Hydro-pneumatic tank sizing Note: Hydropneumatic tank size is designed based on the following information. (A) Three (3) no(s) of Pump System is running on a differential pressure of 10 m (B) No(s) of allowable start/stop per hour is based on; Motor Size Motor below 2.2 kW Motor from 3 ­ 7.5 kW 11 kW and above Results Maximum Capacity Cut in 10 m Cut in 15 m Cut out 20 m Cut out 25 m 44 igpm 33 igpm 73 igpm 55 igpm 146 igpm 110 igpm 220 igpm 165 igpm 110 igpm 220 igpm 146 igpm 330 igpm 220 igpm 440 igpm 293 igpm 550 igpm 367 igpm 37 igpm 28 igpm 63 igpm 47 igpm 126 igpm 94 igpm 189 igpm 141 igpm 94 igpm 189 igpm 126 igpm 283 igpm 189 igpm 377 igpm 252 igpm 472 igpm 315 igpm Type of Starter (based on motor size) DOL Star Delta DOL Star Delta DOL Star Delta DOL Star Delta Auto Transformer Star Delta Auto Transformer Star Delta Auto Transformer Star Delta Auto Transformer Star Delta Auto Transformer 2000 Litre 1500 Litre Recommended Hydro-pneumatic tank capacity 300 Litre Type of Starting DOL Star Delta Auto-Transformer Maximum nos. of start/stop per hour 20 15 10

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1000 Litre

3000 Litre

4000 Litre

5000 Litre

HYDROPNEUMATIC TANK SIZING (Guide for 4 pumps system) Analysis on flowrate Vs Hydro-pneumatic tank sizing Note: Hydropneumatic tank size is designed based on the following information. (A) Four (4) no(s) of Pump System is running on a differential pressure of 10 m. (B) No(s) of allowable start/stop per hour is based on; Motor Size Motor below 2.2 kW Motor from 3 ­ 7.5 kW 11 kW and above Results Maximum Capacity Cut in 10 m Cut in 15 m Cut out 20 m Cut out 25 m 58 igpm 44 igpm 97 igpm 73 igpm 195 igpm 146 igpm 293 igpm 220 igpm 146 igpm 293 igpm 195 igpm 440 igpm 293 igpm 587 igpm 391 igpm 734 igpm 489 igpm 50 igpm 37 igpm 84 igpm 63 igpm 168 igpm 126 igpm 252 igpm 189 igpm 126 igpm 252 igpm 168 igpm 378 igpm 252 igpm 504 igpm 336 igpm 630 igpm 420 igpm Type of Starter (based on motor size) DOL Star Delta DOL Star Delta DOL Star Delta DOL Star Delta Auto Transformer Star Delta Auto Transformer Star Delta Auto Transformer Star Delta Auto Transformer Star Delta Auto Transformer 2000 Litre 1500 Litre Recommended Hydro-pneumatic tank capacity 300 Litre Type of Starting DOL Star Delta Auto-Transformer Maximum nos. of start/stop per hour 20 15 10

500 Litre

1000 Litre

3000 Litre

4000 Litre

5000 Litre

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Microsoft Word - HPNEUMATIC TANK SIZE CALCULATION.doc