Page 430 - Centrifugal Pumps 2E

394 Centrifugal Pumps: Design and Application

Figure 17-30. Package mechanical seal installation for a pipeline pump (cour-
tesy 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 con-
ditions 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