Technology & Engineering
Seal Engineering
Seal engineering involves the design and development of seals used in various mechanical systems to prevent leakage or contamination. This field encompasses the selection of appropriate materials, the study of sealing mechanisms, and the optimization of seal performance. Engineers in this discipline work to ensure that seals effectively maintain the integrity and functionality of the systems they are integrated into.
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3 Key excerpts on "Seal Engineering"
eBook - ePub- Heinz P. Bloch(Author)
- 1998(Publication Date)
- Gulf Professional Publishing(Publisher)
A broad overview of fundamental seal technology will help end users understand how fundamental changes may result in more economical and reliable sealing solutions in the future.• The user community is demanding sealing systems that provide increased reliability, have longer life, and are more forgiving to the off-design operation of the equipment. Major refineries and chemical plants around the world establish programs to make seal installations simpler and more foolproof. Expected seal life, which in 1986 averaged nine months in many of the fluid processing industries, is being pushed toward a five-year goal in refineries and chemical plants in the United States and around the world.• Increased emphasis on economics and energy conservation is forcing seal manufacturers and end users to select new seal designs that will run at higher temperatures, pressures, and speeds than ever before. In some of these instances, the requirements are met by simple changes in materials, but more frequently, radical changes in design and fundamental modes of operation are required in order to achieve the performance advantages sought by the end user.• Another factor adding to the changes in seal design and sealing systems is the basic understanding of seal technology. The basic way we do things has been changing. Fundamental modes of lubrication, seal materials, and analytical tools have advanced significantly, greatly expanding the range of application and enhancing the performance of mechanical seals.Seal Classification
All sealing devices can be classified into two generic classifications: static and dynamic (Figure 13-35 ).Figure 13-35 General classifications of seals.Static seals include such products as gaskets, sealants, and direct-contact sealing devices. Dynamic seals, which will be the broader point of discussion in this segment, are classified into two broad categories: rotating seals and reciprocating seals. Our focus will primarily be on rotating sealing devices.
eBook - PDFFriction Wear Lubrication
Tribology Handbook
- I. V. Kragelsky, V. V. Alisin(Authors)
- 2016(Publication Date)
- Pergamon(Publisher)
Chapter 24 SEALS 24.1. GENERAL PRINCIPLES OF SEALING 24.1.1. Basic Definitions A seal (packing) is a combination of components which provides for tightening effect. The sealing capacity is the main characteristic of the performance of a seal; it is measured by the mass of a substance escaping through the seal (leakage rate). Tightness specifications are dictated by the reliability and service-life requirements for a particular piece of engineering equipment. The seal performance factor is expressed by the relationship i = l -— = 1 -[m{t)dt m p nip j v ' U where m and m p are respectively the actual and permissible masses of leaking substance over the rated service life t r , m (t) is a function describing the variation of leakage with time, t 0 is the moment at which the seal begins to leak, determined by a particular tightness checking method. If the leakage mass m 0. In the inoperative-failure conditions when m > m pi the factor i
eBook - PDFIndustrial Tribology
The Practical Aspects of Friction, Lubrication and Wear
- M.H. Jones, D. Scott(Authors)
- 1983(Publication Date)
- North Holland(Publisher)
330 1 L 1 SEALS FOR FLUID POWER EQUIPMENT PART ONE B.D.HALLIGAN, C Eng,MIMechE AMPRI, Technical Manager (Product Applications) James Walker & Co.Ltd. 14.1 INTRODUCTION The f a c t t h a t a seal manufacturing industry e x i s t s a t a l l o r i g i n a t e s from the commercial o r physical i m p r a c t i c a b i l i t y o f achieving p e r f e c t and permanent m u t u a l i t y o f adjacent surfaces - be they i n dynamic o r s t a t i c r e l a t i o n s h i p . Sealing devices, which are u s u a l l y o f an e s s e n t i a l l y deformable nature, per- m i t the f l u i d power designer t o work w i t h i n economically sensible conditions of f i t , surface f i n i s h , tolerance and f l u i d cleanliness across t h e range o f temper- atures and pressure conditions w i t h which he i s l i k e l y t o contend. The designer o f f l u i d power equipment has, i n f a c t , influenced trends i n the sealing industry by going beyond the fundamental requirement o f introducing an environmentally t o l e r a n t component f o r preventing leakage. The quest t o mini- mise production costs has accelerated the movement towards seal designs embody- ing i n t e g r a l bearings and a n t i -e x t r u s i o n devices capable of supporting seals against substantial e x t r u s i o n gaps a t s i g n i f i c a n t pressures. Overall i n the context o f those seals s p e c i f i e d f o r l i n e a r dynamic motion, a much a x i a l l y shorter seal has evolved which allows h x d r a u l i c c y l i n d e r s , f o r example, t o be produced t o more compact proportions w i t h the consequent saving i n raw material costs and i n the b u l k o f f l u i d power sub-assemblies.
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