Centrifugal Pumps Design and Application 2nd ed - Val S. Lobanoff, Robert R. Ross (Butterworth-Heinemann, 1992)
Mechanical Seals 393 Figure 17-29. Carbon primary ring with hydropad face design (courtesy of John Crane). types of seals are measured in parts per million. The seal illustrated in Figure 17-30 has been successfully applied to sealing light hydrocarbon at the following conditions: • Liquid sealed: ethylene, ethane, or propane • Stuffing box pressure: 500 to 1200 psig • Temperature: 30 to 60°F • Specific gravity: 0.3 to 0.9 • Speed: 1500 to 3480 rpm • Seal size: 5.375 inches Many installations have been made and thousands of hours of seal life have been realized. The materials of construction for the seal faces are carbon versus tungsten carbide. Hydropads have also been successfully applied to high temperature applications requiring a metal bellows seal. The seal shown in Figure 17-31 is a typical installation that has been in service for more than three years. This was a difficult application for the original seals that were specified.
394 Centrifugal Pumps: Design and Application Figure 17-30. Package mechanical seal installation for a pipeline pump (courtesy of John Crane). Figure 17-31. Mechanical seal for a high temperature refinery charge pump (courtesy of John Crane). Failure occurred due to vaporization at the seal faces. The seal shown has been through many startups with no adverse effects. The operating conditions for this application are: • Liquid sealed: gas oil • Stuffing box pressure: 278 psig • Temperature: 615 °F • Specific gravity: 0.665 • Speed: 3550 rpm • Seal size: 3.125 inches
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394 <strong>Centrifugal</strong> <strong>Pumps</strong>: <strong>Design</strong> <strong>and</strong> <strong>Application</strong><br />
Figure 17-30. Package mechanical seal installation for a pipeline pump (courtesy<br />
of John Crane).<br />
Figure 17-31. Mechanical seal for a high temperature refinery charge pump<br />
(courtesy of John Crane).<br />
Failure occurr<strong>ed</strong> due to vaporization at the seal faces. The seal shown has<br />
been through many startups with no adverse effects. The operating conditions<br />
for this application are:<br />
• Liquid seal<strong>ed</strong>: gas oil<br />
• Stuffing box pressure: 278 psig<br />
• Temperature: 615 °F<br />
• Specific gravity: 0.665<br />
• Spe<strong>ed</strong>: 3550 rpm<br />
• Seal size: 3.125 inches
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