Goulds Pumps 3296 EZMAG - IOM - Manual (Page 48)

Commissioning, Startup, Operation, and Shutdown
Minimum continuous recommended flow
Table 3: Minimum flow in GPM (m 3 /hr)
NOTICE:
These measurements are based on water with a Specific Gravity of 1.0 and a Specific Heat of 1.0.
Group Size 3500 rpm 2900 rpm 1750 rpm 1450 rpm
S 1 x 1½ - 6 23 (5) 15 (4) 11 (3) 8 (2)
1 x 1½ - 6G 7.0 (1.6) 4.9 (1.1) 1.8 (0.4) 1.2 (0.27)
1½ x 3 - 6 30 (7) 25 (6) 15 (4) 13 (3)
2 x 3 - 6 56 (12.5) 47 (11) 28 (6) 23 (5)
1 x 1½ - 8 10 (2.5) 7 (2) 3 (1) 2 (1)
1 x 1½ - 8H 22 (5) 18 (4) 11 (2.5) 9 (2)
1½ x 3 - 8 34 (8) 29 (7) 17 (4) 14 (3)
S/M 2 x 3 - 8 74 (17) 61 (14) 37 (9) 20 (5)
M (8 in.) 3 x 4 - 7 157 (36) 127 (29) 78 (18) 64 (15)
3 x 4 - 8G 159 (36) 129 (30) 79 (18) 65 (15)
M (10 in.) 1 x 2 - 10 21 (5) 13 (3) 9 (2) 7 (2)
1½ x 3 - 10 41.5 (9) 35 (8) 21 (5) 17.5 (4)
2 x 3 - 10 78 (18) 65 (15) 38 (9) 31 (7)
3 x 4 - 10 173 (40) 144 (33) 86 (20) 72 (16)
M (13 in.) 1½ x 3 - 13 53 (12) 44 (10) 26 (6) 22 (5)
Pump operation precautions
General considerations
CAUTION:
• Vary the capacity with the regulating valve in the discharge line. Never throttle the flow from the
suction side since this can result in decreased performance, unexpected heat generation, and
equipment damage.
Do not overload the driver. Driver overload can result in unexpected heat generation and equipment
damage. The driver can overload in these circumstances:
• The specific gravity of the pumped fluid is greater than expected.
• The pumped fluid exceeds the rated flow rate.
• Do not operate pump past the maximum flow. For maximum flow refer to the pump performance
curve.
• Do not overload the driver. Driver overload can result in unexpected heat generation and equipment
damage. The driver can overload in these circumstances:
• The specific gravity of the pumped fluid is greater than expected.
• The pumped fluid exceeds the rated flow rate.
• Do not operate pump below hydraulic or thermal minimum flow. For hydraulic minimum flows refer
to technical manual and pump performance curve. To calculate thermal minimum flow, refer to HI
Centrifugal Pumps for Design and Application ANSI/HI 1.3-2000.
• Make sure to operate the pump at or near the rated conditions. Failure to do so can result in pump
damage from cavitation or recirculation.
Operation at reduced capacity
WARNING:
Never operate any pumping system with a blocked suction and discharge. Operation, even for a brief
period under these conditions, can cause confined pumped fluid to overheat, which results in a violent
explosion. You must take all necessary measures to avoid this condition. If pump becomes plugged shut
down and unplug prior to restarting pump.
46 Model 3296 EZMAG Installation, Operation, and Maintenance Manual