Centrifugal Pumps Design and Application 2nd ed - Val S. Lobanoff, Robert R. Ross (Butterworth-Heinemann, 1992)
Double-Suction Pumps 83 LOCATION AREA IMPELLER SECTION SUCTION EYE A-B FLANGE 100 120 TO 140 132 TO 169 Figure 7-4. Suction area progression. Figure 7-5. Double-suction layout—sections.
84 Centrifugal Pumps: Design and Application 11. Repeat Step 10 for Sections C-D or any other sections deemed necessary. 12. Close sections with appropriate radii. These should be liberal for castability and should follow a smooth transition in the end view. 13. Check areas and if necessary adjust end view and/or profile view to satisfy area progression (Figure 7-4). Example Double Suction Pump: • Eye diameter D| = 5.5 in. » Shaft diameter = 3 in. • Total eye area = 32 in. 2 • Area at A-B = 39 in. 2 • Suction nozzle = 8 in. Area = 50 in. 2 • Area section #6 = 19.5 in. 2 • Area section #5 = 14.6 in. 2 • Area section #4 = 9.75 in. 2 • Area section #3 = 4.9 in. 2 The double-suction casing in combination with a double-suction impeller has an inherent NPSH advantage over a single-suction combination. Reduction of the required NPSH is normally 40% to 50%. This NPSH advantage of the double suction model makes it possible to be adopted (in addition to the standard horizontally split, single-stage pump) to many different types of centrifugal pumps such as: « Double-suction single-stage vertically split casing pumps, suitable for high temperatures and medium pressures. » As a first stage in a horizontally split multi-stage double-volute-type pump. • As a first stage in the barrel-type multi-stage units, suitable for very high pressures and temperatures up to 800 °F. • To the overhung API process single-stage pumps. • In vertical pumps (can type) as a single-stage or as a first-stage arrangement, to reduce "can" length. • Vertical in-line booster pumps.
- Page 48 and 49: Impeller Design 33 Step 8: Estimate
- Page 50 and 51: Impeller Design 35 Figure 3-7. Volu
- Page 52 and 53: impeller Design 37 (2) 5 , as final
- Page 54 and 55: Impeller Design 39 The vane develop
- Page 56 and 57: Impeller Design 41 Figure 3-12. Are
- Page 58 and 59: impeller Design 43 Figure 3-16. Inf
- Page 60 and 61: 4 General Pump Design It is not a d
- Page 62 and 63: General Pump Design 4? Figure 4-1.
- Page 64 and 65: General Pump Design 49 designed and
- Page 66 and 67: Volute Design 51 Figure 5-1. Volute
- Page 68 and 69: Volute Design 53 Figure 5-2. Radial
- Page 70 and 71: Volute Design 55
- Page 72 and 73: Volute Design 57 Figure 5-4. Effici
- Page 74 and 75: Volute Design 59 Figure 5-5. Typica
- Page 76 and 77: Volute Design 61 Figure 5-8. Univer
- Page 78 and 79: Volute Design S3 Manufacturing Cons
- Page 80 and 81: 6 Design of Multi-Stage Casing Mult
- Page 82 and 83: Design of Multi-Stage Casing 67 How
- Page 84 and 85: Design of Multi-Stage Casing 69 Fig
- Page 86 and 87: Design of Multi-Stage Casing 71 Fig
- Page 88 and 89: Design of Multi-Stage Casing 73 sec
- Page 90 and 91: Design of Multi-Stage Casing 75 Fig
- Page 92 and 93: 7 Double-Suction Pumps and Side-Suc
- Page 94 and 95: Double-Suction Pumps 79 two. Experi
- Page 96 and 97: Double-Suction Pumps 81 Figure 7-3.
- Page 100 and 101: 8 NPSH The expressions NPSHR and NP
- Page 102 and 103: NPSH 87 Predicting NPSHR The other
- Page 104 and 105: NPSH 89 Figure 8-4. Pressure loss b
- Page 106 and 107: NPSH 91 SUCTION VELOCITY TRIANGLES
- Page 108 and 109: NPSH 93 Figure 8-8. Performance cur
- Page 110 and 111: NPSH 95 Figure 8-10. Leakage across
- Page 112 and 113: NPSH 97 Figure 8-13. Plate inserts
- Page 114 and 115: NPSH 99 Figure 8-17. Influence of p
- Page 116 and 117: NPSH 101 Figure 8-19. Estimating K
- Page 118 and 119: NPSH 103 Step 3: Determine KI* From
- Page 120 and 121: Figure 8«22. Calculating NPSHA for
- Page 122 and 123: NPSH 107 Figure 8-24. NPSHR cavitat
- Page 124 and 125: NPSH 109 Notation KI Friction and a
- Page 126 and 127: Part 2 Application
- Page 128 and 129: 9 by Erik B. Fiske BW/JP Internatio
- Page 130 and 131: Vertical Pumps 115 Figure 9-2. Well
- Page 132 and 133: Vertical Pumps 117 Figure 9-4. Subm
- Page 134 and 135: Vertical Pumps 119 Figure 9-6. Inst
- Page 136 and 137: Vertical Pumps 121 Figure 9-8. Barr
- Page 138 and 139: Vertical Pumps 123 • Loading pump
- Page 140 and 141: Vertical Pumps 125 Wet Pit Pumps Th
- Page 142 and 143: Vertical Pumps 127 • Fresh water
- Page 144 and 145: Vertical Pumps 129 Condensate and H
- Page 146 and 147: Vertical Pumps 131 mally insulate w
Double-Suction <strong>Pumps</strong> 83<br />
LOCATION<br />
AREA<br />
IMPELLER<br />
SECTION<br />
SUCTION<br />
EYE<br />
A-B<br />
FLANGE<br />
100<br />
120 TO 140<br />
132 TO 169<br />
Figure 7-4. Suction area progression.<br />
Figure 7-5. Double-suction layout—sections.
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