Mechanical shaft seals for pumps - Grundfos

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3 Pressure intensifier The Grundfos pressure intensifier automatically creates a pressure that is 2 bar higher than the pump medium pressure, independent of the specific pump medium pressure. The system maintains the overpressure automatically until it is empty. The intensifier requires a discontinuous working cycle, as it has to be refilled. The barrier fluid inlet must be fitted with a non-return valve to avoid back pressure to the BAR source. See. fig.2.5. 5 BAR BAR High pressure Low pressure BAR 1. Seal chamber with barrier fluid 2. Pump with pumped medium 3. Non-return valve, inlet side 4. Safety non-return valve (>5 bar) 5. Elastomer membrane Fig. 2.5: Pressure intensifier mounted on a Grundfos CR pump 4 BAR Connection to the seal chamber Connection to the pumped medium 1 2 35
36 Mechanical shaft seal types and sealing systems Tandem seal arrangement with flushing fluid, Seal type arrangement P The system contains a seal chamber with two shaft seals mounted in the same direction. The flushing fluid between the two seals has lower pressure as compared to the pumped medium and offers several advantages to the product-side shaft seal such as following: • There is no evaporation in the sealing gap. This prevents the formation of deposits as well as crystallisation on the flushing fluid side. • The flushing fluid lubricates and cools even when the pump runs dry or runs with vacuum. See fig. 2.6. Fig. 2.6: Grundfos CR pump with a tandem seal arrangement High pressure Low pressure
Page 1 and 2: Mechanical shaft seals for pumps
Page 3 and 4: Contents Preface 5 Chapter 1. Intro
Page 6 and 7: Chapter 1 1. Types of shaft seals 2
Page 8 and 9: Fig. 1.2: Braided stuffing box pack
Page 10 and 11: O-ring, stationary O-ring, rotating
Page 12 and 13: The rotating part The rotating part
Page 14 and 15: Closing force The parts of the seal
Page 16 and 17: In the examples above, where the ar
Page 18 and 19: Non-parallel seal faces System In p
Page 20 and 21: Atmosphere A B C D Vapour pressure
Page 22 and 23: 1993 Rubber bellows seal introduced
Page 25 and 26: 26 Mechanical shaft seal types and
Page 33: 34 Mechanical shaft seal types and
Page 43 and 44: Chapter 3 Materials 1. Seal face ma
Page 45 and 46: The metals used for metal-impregnat
Page 47 and 48: Silicon carbide (SiC) 100 µm Fig.
Page 49 and 50: 2. Seal face material pairings Carb
Page 51 and 52: WC against WC A shaft seal with WC
Page 53 and 54: 3. Testing of shaft seals Various t
Page 55 and 56: [ °C ] 250 200 150 Organic film bi
Page 57 and 58: Chemical adhesion of surfaces All s
Page 59 and 60: 5. Materials of other shaft seal pa
Page 61 and 62: 64 Tribology The science of frictio
Page 63 and 64: 66 Tribology Duty parameter The mec
Page 65 and 66: Surface film 68 3.5 Tribology 3.0 2
Page 67 and 68: 70 Tribology The lapped surface has
Page 69 and 70: 72 2.0 1.5 Tribology 1.0 0.5 Dry ru
Page 71 and 72: 74 Tribology Summary This section d
Page 73 and 74: 76 Failure of mechanical shaft seal
Page 85 and 86:
88 7. Shaft seal failure analysis T
Page 87 and 88:
s of shaft seal failure Incorrect i
Page 89 and 90:
Chapter 6 Standards and approvals 1
Page 91 and 92:
Example of designation for a mechan
Page 93 and 94:
2. Approvals Specific approvals of
Page 95 and 96:
The guideline on in-place cleanabil
Page 97:
Summary Different applications requ
Page 100 and 101:
contact points 65 contact surface 8
Page 102 and 103:
M magnetic-drive system 40 malfunct
Page 104 and 105:
spring force 13, 15 springs and bel
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Mechanical shaft seals for pumps - Grundfos

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