ABSTRACT

This chapter presents the design examples that illustrates just a few of the many designs and features found in practical mechanical seals. It discusses that one must provide the seal with the best possible working environment, by suitable design of the seal chamber and control of the fluid conditions in the chamber. The chapter talks about heat transfer, control of gas or vapor, and control of solids. Generally, mechanical seals have to be designed and operated to meet a number of essential requirements throughout their working life. Dual seals can incorporate a noncontacting standby seal. This is actuated to bring its faces into operation only following failure of the primary seal, by utilizing the rising interstage pressure. A torque transmission arrangement is needed to react the friction torque generated between the seal faces. But it must not interfere with the axial freedom of the floating ring.