CR, CRI, CRX, CRN - T-P Pump and Pipe Co.

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18 Selection and sizing Pump connection Selection of pump connection depends on rated pressure and pipework. To meet any requirement the CR, CRI, CRX and CRN pumps offer a wide range of flexible connections such as: • oval flange NPT • ANSI flange • PJE coupling • FlexiClamp • other connections on request. Shaft seal As standard, the CR range is fitted with a Grundfos shaft seal suitable for the most common applications. The following three key parameters must be taken into account, when selecting the shaft seal: • type of pumped liquid • liquid temperature and • maximum pressure. Grundfos offers a wide range of shaft seal variants to meet specific demands (see "List of pumped liquids", page 74). Inlet pressure and operating pressure It should be checked whether the pressure conditions are fulfilled. The limit values stated on pages 14-15 must not be exceeded as regards ... • maximum inlet pressure • maximum operating pressure. Oval Vertical multistage centrifugal pumps ANSI PJE TM02 1201 0601 TM02 0538 4800 TM02 1204 0601
Selection and sizing Minimum inlet pressure - NPSH Calculation of the inlet pressure “H” is recommended when ... • the liquid temperature is high • the flow is significantly higher than the rated flow • water is drawn from depths • water is drawn through long pipes • inlet conditions are poor. To avoid cavitation, make sure that there is a minimum pressure on the suction side of the pump. The maximum suction lift “H” in feet of head can be calculated as follows: H = PB – NPSHR – Hf – Hs – Hv PB = Barometric pressure in feet absolute. (Barometric pressure can be set to 33.9 ft at sea level). In closed systems, PB indicates the system pressure in feet. NPSHR = Net Positive Suction Head in feet of head. (To be read from the NPSHR curve at the highest flow the pump will be delivering). Hf = Friction loss in suction pipe in feet of head. (At the highest flow the pump will be delivering.) Hv = Vapor pressure in feet of head. (To be read from the vapor pressure scale. “Hv” depends on the liquid temperature “Tm”). Hs = Safety margin = minimum 1-1/2 feet of head. If the “H” calculated is positive, the pump can operate at a suction lift of maximum “H” feet of head. If the “H” calculated is negative, an inlet pressure of minimum “H” feet of head is required. H Vertical multistage centrifugal pumps Hf Pb Hv NPSH Check that the pump is not and will not be exposed to cavitation. TM01 1242 - TK00 3037 19
Page 1 and 2: GRUNDFOS PRODUCT GUIDE CR, CRI, CRX
Page 3 and 4: Mission - to successfully develop,
Page 5 and 6: General data Product range Range: V
Page 7 and 8: General data Pump The CR pump is a
Page 9 and 10: General data CR 8 and 16 12 1 10 3
Page 11 and 12: General data Vertical multistage ce
Page 13 and 14: General data Operating range of the
Page 15 and 16: General data Maximum operating pres
Page 17: Selection and sizing Selection of C
Page 21 and 22: Technical data Dimensional sketches
Page 69 and 70:
Technical data Dimensional sketches
Page 71 and 72:
Technical data Dimensional sketches
Page 73 and 74:
Motor Data TEFC Motors HP PH TEFC F
Page 75 and 76:
Pumped liquids Vertical multistage
Page 77 and 78:
Accessories Pipework connection For
Page 79 and 80:
Accessories LiqTec A dry-running pr
Page 81:
Submittal Data Sheet CR, CRI(X), CR
Page 84:
L-CR-PG-001 9/02 PRINTEDINUSA GRUND
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CR, CRI, CRX, CRN - T-P Pump and Pipe Co.

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