FK 40 - Tri-Canada

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Centrifugal pumps Correction of the impeller diameter See t he values ζ st at ed in t he t able below. Calculation: • take the figure stated in the table for d, see table ζ ,calculat e Δ p . V • if Δp varies f rom t he required value, t ake new value f or d and calculat e once more Δp . V V A correction of the impeller diameter is to be favoured when a permanent reduction of flow rate or differential head is required. The performance of the pump is adjusted towards the duty point by reducing the impeller diameter. The operating point is shifted from B1 to B2. This is the point where the new pump curve meet s t he plant curve. The required impeller diameter can be determined easily using following formulae: N = power consumtion D = impeller diameter Q = flow rate H = total head Note: t he ef f iciency of t he pump decreases with increasing correct ion.
A great number of various operating points can be set continuously, when modifying the pump speed using a variable speed drive or frequency inverter. The operating point moves on the pump curve from B to B2. Considering the overall efficiency, this is the best way of flow control. Using a variablespeed drive or a frequency inverter additional costs can arise and should be evaluated in an economic appraisal. The f low rat e changes linearly t o t he speed. The total head changes with the square of speed. The power consumption changes with the third power of the speed. In the case of pumps connected in parallel the fluid flows are added with corresponding delivery head. This applies to pumps even with different Q/H curve. Centrifugal pumps Pump speed control Parallely connected pumps
Page 2 and 3: Content Pump technology terms . . .
Page 4 and 5: Pump technology terms Flow rat e [m
Page 6 and 7: Pump technology terms Flow behaviou
Page 8 and 9: Pump technology terms Types of flow
Page 10 and 11: Pump technology terms NPSH value [m
Page 12 and 13: Loss of head calculation Loss of he
Page 14 and 15: Loss of head calculation Example: F
Page 16 and 17: Centrifugal pumps Feat ures of t he
Page 20 and 21: Centrifugal pumps Pumps connected i
Page 22 and 23: Centrifugal pumps Centrifugal pump
Page 24 and 25: Centrifugal pumps Centrifugal pump
Page 26 and 27: Centrifugal pumps Power consumption
Page 28 and 29: Centrifugal pumps Self- priming cen
Page 30 and 31: Centrifugal pumps Multistage centri
Page 32 and 33: Positive displacement pumps Perform
Page 34 and 35: Positive displacement pumps Selecti
Page 36 and 37: Positive displacement pumps Case 1:
Page 46 and 47: Positive displacement pumps Rotary
Page 58 and 59: Mechanical seal selection Double me
Page 60 and 61: Mechanical seal selection “Face t
Page 62 and 63: Mechanical seal selection Elastomer
Page 64 and 65: Pump cleaning SIP After CIP cleanin
Page 66 and 67: Index Cavitation . . . . . . . . .

FK 40 - Tri-Canada

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