CR, CRI, CRN, CRE, CRIE, CRNE - Grundfos Canada

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Selection and sizing CR, CRI, CRN, CRE, CRIE, CRNE Normally, E-pumps are used in applications characterized by a variable flow. Consequently, it is not possible to select a pump that is constantly operating at optimum efficiency. In order to achieve optimum operating economy, the pump should be selected on the basis of the following criteria: • The max. required duty point should be as close as possible to the QH curve of the pump. • The required duty point should be positioned so that P2 is close to the max. point of the 100 % curve. Between the min. and max. performance curve E- pumps have an infinite number of performance curves each representing a specific speed. Therefore it may not be possible to select a duty point close to the 100 % curve. H [ft] Max. curve Note: The approximated formulas apply on condition that the system characteristic remains unchanged for nn and nx and that it is based on the formula H = k x Q2, where k is a constant. The power equation implies that the pump efficiency is unchanged at the two speeds. In practice this is not quite correct. Finally, it is worth noting that the efficiencies of the frequency converter and the motor must be taken into account if a precise calculation of the power saving resulting from a reduction of the pump speed is wanted. H H n n x n n Q n n n ------- = ------ Q x n x H n n n 2 ------- = ------ H n x x Eta Eta Q x Q n Q 0 Min. curve 0 Q [US GPM] TM02 7572 4803 n ------ ª 1 x Fig. 21 Min. and max. performance curves In situations where it is not possible to select a duty point close to the 100 % curve the affinity equations to the right can be used. The head (H), the flow (Q) and the input power (P) are all the appropriate variables for the motor speed (n). H x Q x P n P P n P x Q n Q Q ------ P x n n 3 = ------ n x TM00 8720 3496 Fig. 22 Affinity equations Legend H n H x Q n Q x Rated head in feet Current head in feet Rated flow in US GPM Current flow in US GPM n n Rated motor speed in min -1 (n n = 3500 min -1 ) n x Current motor speed in min -1 n Rated efficiency in % x Current efficiency in % 22
Selection and sizing CR, CRI, CRN, CRE, CRIE, CRNE WinCAPS and WebCAPS WinCAPS and WebCAPS are both selection programs offered by Grundfos. The two programs make it possible to calculate an E-pump’s specific duty point and energy consumption. By entering the sizing data of the pump, WinCAPS and WebCAPS can calculate the exact duty point and energy consumption. For further information see page 89 and page 90. 6. Inlet pressure and operating pressure Do not exceed the limit values stated on page 18 and page 20 as regards these pressures: • maximum inlet pressure and • maximum operating pressure. 3. Material The material variant (CR(E), CRI(E), CRN(E)) should be selected based of the liquid to be pumped. The product range covers three basic types. • The CR(E), CRI(E) pump types are suitable for clean, non-aggressive liquids such as potable water, oils, etc. Fig. 23 CR pump TM03 2155 3805 • The CRN(E) pump type is suitable for industrial liquids and acids, see List of pumped liquids on page 74 or contact Grundfos. G (ANSI) For saline or chloride-containing liquids such as sea water, CRT(E) pumps of titanium are available. 4. Pump connection Selection of pump connection depends on the rated pressure and pipework. To meet any requirement the CR(E), CRI(E) and CRN(E) pumps offer a wide range of flexible connections such as: A (Oval) Fig. 24 Pump connections P (PJE) TM02 1201 0601 • Oval flange (NPT) - fig. 24 • ANSI flange - fig. 24 • PJE coupling - fig. 24 • Clamp coupling • Union (NPT[M]) • Other connections on request. TM02 0538 4800 5. Shaft seal As standard, the CR(E) range is fitted with a Grundfos shaft seal (Cartridge type) suitable for the most common applications, see fig. 25. Fig. 25 Shaft seal (Cartridge type) 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 on page 74. 23
Page 1 and 2: GRUNDFOS PRODUCT GUIDE CR, CRI, CRN
Page 3 and 4: Mission It is our mission — the b
Page 5 and 6: Product overview CR, CRI, CRN, CRE,
Page 7 and 8: Product overview CR, CRI, CRN, CRE,
Page 9 and 10: UR Product overview CR, CRI, CRN, C
Page 11 and 12: Product overview for E-pumps CR, CR
Page 13 and 14: Control of E-pumps CR, CRI, CRN, CR
Page 15 and 16: Construction CR, CRI, CRN, CRE, CRI
Page 17 and 18: Type keys and codes CR, CRI, CRN, C
Page 19 and 20: Operating and inlet pressure CR, CR
Page 21: Selection and sizing CR, CRI, CRN,
Page 25 and 26: Selection and sizing CR, CRI, CRN,
Page 27 and 28: Technical data CR 1s D2 D1 D2 D1 B2
Page 29 and 30: Technical data CRN 1s D1 D1 B2 B2 G
Page 31 and 32: Technical data CR(E) 1 D2 D1 D2 D1
Page 33 and 34: Technical data CRN(E) 1 D2 D1 D2 D1
Page 45 and 46: Technical data CRN(E) 10 D2 D1 D2 D
Page 55 and 56: Technical data CR(E) 32 TM02 7699 1
Page 57 and 58: Performance curves CR(E) 45, CRN(E)
Page 59 and 60: Technical data CRN(E) 45 TM02 7704
Page 61 and 62: Technical data CR(E) 64 TM02 7701 1
Page 63 and 64: Performance curves CR 90, CRN 90 CR
Page 65 and 66: Technical data CRN 90 D2 D1 4 STAGE
Page 67 and 68: Technical data CR 120 1-1 to 4-2 ST
Page 69 and 70: Performance curves CR, CRN 150 H [m
Page 71 and 72: Technical data CRN 150 1-3 STAGES 5
Page 73 and 74:
Motor data CR, CRI, CRN, CRE, CRIE,
Page 75 and 76:
Pumped liquids CR, CRI, CRN, CRE, C
Page 77 and 78:
Accessories CR, CRI, CRN, CRE, CRIE
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Page 81 and 82:
Page 83 and 84:
Variants CR, CRI, CRN, CRE, CRIE, C
Page 85 and 86:
Submittal data CR, CRI, CRN, CRE, C
Page 87 and 88:
Quotation text CR, CRI, CRN, CRE, C
Page 89 and 90:
Further documentation CR, CRI, CRN,
Page 92:
Being responsible is our foundation
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CR, CRI, CRN, CRE, CRIE, CRNE - Grundfos Canada

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