Doc. 25.MECHANICAL SEALS FOR HYGIENIC AND ASEPTIC APPLICATIONS - english version

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download.PDF.EHEDG.DOC_25_E_2020
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EHEDG 2nd edition 2020
Seiten / pages: 82

This guideline concerns the design and selection of mechanical seals and seal auxiliary-systems that meet the hygienic and if specified aseptic requirements of food-applications. Requirements for design, materials, installation and operation of mechanical seals and seal auxiliary-systems are defined with respect to ease of cleaning, microbial impermeability, sterilizability and pasteurizability. The guideline is applicable for suppliers and users.
Mechanical seals are mainly used between a rotating shaft and a static housing. There may also be applications with a static shaft and rotating housing or rotary joints. Mechanical seals are supplied in different types, arrangements, design-concepts and materials. Sometimes, they need to be operated together with a seal auxiliary-system to achieve the required seal performance.
After a short description of the major technical variants, their hygienic suitability is examined. The proper installation and operation of the mechanical seal and the seal auxiliary-system are then described.

Objectives and scope
Normative References
Definition of Terms
General Considerations

Sealing-devices
The Functional Principle of a Mechanical Seal
Operational Parameters
General Classification of Mechanical Seals
Seal-type
Seal-arrangement
Seal-design-concept
General Requirements
Design
Product-contact Side
Quench/Buffer/Barrier-fluid Chamber
Non-product Side
Materials
Special Considerations
Mechanical Seals for Hygienic and for Aseptic Applications
Guidance on Seal-parts
Springs
Seal-faces
Secondary Seals
Miscellaneous Parts
Guidance on Seal-arrangements
Single-seal Arrangement
Dual-seal Arrangement
Dual-seal Arrangement with Buffer-fluid
Dual-seal Arrangement with Barrier-fluid
Guidance on Seal-design Concepts
Radially-split Seal
Component-seal
Unitized Seal-assembly
Cartridge-seal
Seal Auxiliary Systems
Classification
General Requirements
Components
Installation
Installation of the mechanical seal
Installation of the seal auxiliary system
Operation
Aseptic Application
Vacuum
Cleaning
Documentation
Annex A - Checklist
Annex B - Mechanical Seals for Food-applications (Examples)
Annex C - Seal Auxiliary Systems for Food-applications (Examples)
Annex D - Datasheet
Annex E - Literature


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