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C0 n t e n t s ~ ~ ~~ - : ~ .......

5.2.1 Closed loop systems 73
5.2.2 Batch transfer system 76
5.2.3 Multiple destination systems 79
5.3 Price evaluation 80
5.3.1 Traditional pricing negotiation 81
5.3.2 Value based purchasing 82
5.3.3 Factors involved in mechanical suitability 83
5.3.3.1 Mechanical seals 83
5.3.3.2 Seal environment 83
5.3.3.3 Bearings 84
5.3.3.4 Lubricant protection 84
5.3.3.5 Rotational speed 84
5.3.3.6 Shaft slenderness ratio 84
5.3.3.7 Maintenance hours 85
5.3.3.8 Downtime and lost production 85
5.3.3.9 The results 85

6 Stuffing Box Sealing 87
6.1 Shaft sealing 87
6.2 Packing 87
6.3 Mechanical Seals 89
6.3.1 Match the seal to the service 90
6.3.2 The seal faces 91
6.3.3 Seal flexibility options 92
6.3.4 Fretting seals 94
6.3.5 Balanced or unbalanced seals 94
6.3.6 Outside seals 96
6.3.7 Split seals 97
6.3.8 Cartridge seals 97
6.3.9 Double seals 99
6.4 Environmental controls 100
6.4.1 Seal flush 101
6.4.2 Reverse flush 102
6.4.3 Seal quench 102
6.4.4 Barrier fluid systems 103
6.5 The seal chamber 104

Pump Bearings 107
7.1 Pump beatings 107
7.2 Bearing loads 108
7.3 Ball bearings 111
7.4 Other types of bearing 114

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