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Mechanical Seals - Fundamentals

Packing glands are typically utilised to seal process valve shafts (axial movement) and process pump shafts (rotary movement). Throughout engineering history, the packed gland has provided a low-cost, practical solution. In current times, new technical alternatives have taken the place of the packed gland. Years ago, most pump shafts were sealed with soft packing rings compressed by a packing gland, however this sort of shaft seal required a significant volume of fluid only to lubricate and cool the packing.

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Then came the invention of "mechanical seals," which use two very flat surfaces to prevent product leakage around the pump shaft (one stationary and one rotating). Despite the fact that these mechanical seal faces require some (very modest) lubricating or cooling fluid to generate a hydrodynamic layer, this system generally evaporates and is hardly detectable. Mechanical seals are used to seal the majority of pump shafts today. Several developed mechanical seal variants are progressively being employed on fluid pumps to replace packed glands and lip seals. Pumps with mechanical seals are more efficient and, without a doubt, provide far more reliable performance over long periods of time.

What is Mechanical Seal?

A mechanical seal is a shaft sealing device that produces a running and dynamic seal between the rotating and stationary elements of rotary equipment. It was developed to solve the shortcomings of standard compression gland packing.

Contents in  Mechanical Seals - Fundamentals:

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I – INTRODUCTION

II – MECHANICAL SEALS

III - THE BASIC MECHANICAL SEAL

IV - CLASSIFICATION

V – ASSEMBLY OPTIONS

VI – ADITIONAL EQUIPMENT AND DESIGN

VII – MECHANICAL SEAL ARRANGEMENTS

VIII – BARRIER AND BUFFER FLUID SELECTION

IX – DYNAMIC SEALS

X – LEAKAGE FAILURES

XI – MECHANICAL SEALS APPLICATIONS

XII – SEAL OPERATION AND ENVIRONMENT

XIII – API AND CPI STANDARDS

XIV – LINKS AND REFERENCES

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