Info

PRV size, in (mm)

0 (0)

50 (11)

100 (23)

150 (34)

190 (43)

3 (76)

140 (42.7) 140 (42.7) 140 (42.7)

143 (43.6) 141 (43.0) 141 (43.0)

151 (46.0) 146 (44.5) 143 (43.6)

166 (50.6) 153 (46.6) 147 (44.8)

181 (55.2) 160 (48.8) 151 (46.0)

Plot H values on the selected pump curve to obtain the system curves for the three PRCV sizes (Figure 7). The plots reveal that the 3-in (76-mm) valve, a 10-hp (7.5-kW) motor, and 6ยง -in diameter (162-mm) impeller are the proper selections.

Note that if the design capacity of the pump could be reduced to about 178 gpm (40.4 m3/h, a 2^ -in (64-mm) PRCV with the impeller sized for 62 -in (165-mm) diameter may be used without additional power input. This choice reduces the cost and improves the PRCV performance at low flow rates.

Using a 2-in (51-mm) PRCV would require a 15-hp (11-kW) motor operating at about 12.5 hp (9.3 kW) load. This choice is not energy effective.

The power required to drive the pump may be approximated by using the pump curve and Eq. 7. The available NPSH is in excess of the required pump NPSH (Figure 7).

Renewable Energy Eco Friendly

Renewable Energy Eco Friendly

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable.

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