KIRLOSKAR KPDS, Инструкция по установке, эксплуатации и обслуживанию

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IOM/KPDS/NOV 19/00
Page 7 7 7 7 of 50 50 50 50
Issue Date : 22/11/2019
Revision: 00
4.2.1 Enough storage capacity to avoid sudden fluctuations in the liquid level,
kinematics disturbances at the suction of the pump such as turbulences,
eddies, vortices, air entrainment.
4.2.2 Low velocity:
Maximum liquid velocity of the liquid entering the tank should not exceed 1
m/sec.
4.2.3 Individual flow pattern:
Where one tank houses more than one pumping sets, care must be taken to
provide appropriate distances from walls, floor & adjacent pipes. It is advised
that such layouts should be referred to pump manufacturer. This is
necessary to ensure individual flow pattern of each pump undisturbed by
other pumps.
4.2.4 Pump Submergence:
The lowest liquid level should be as recommended in the outline drawing
supplied against the order. Highest liquid level also be below specified level
on the same drawing. The liquid level in the tank should be positively
controlled by liquid level controller/ float switch.
Below is the reference from HI pump intake design.
Dimension
Variable
Description Recommended value
C Distance between the inlet bell & floor C = 0.3 D to 0.5 D
D Inlet bell design outside diameter Suction size of pump
H Minimum liquid depth H = S + C
S Minimum pump inlet bell submergence S = D(1.0+2.3F
D
)
w Constricted bay width near pump inlet bell w = 2D
Where, F
D
= Froude Number = V / √(gD)
V = Velocity at inlet face = Flow /Area