Page 183 - DixonSanitaryCatalog20082010

181 Dixon Sanitary 2010 800.789.1718
Technical Information
U
Technical
Glossary of Terms
#3 fnish Used on stainless steel tubing, only the ID is polished to sanitary standards. The OD is unpolished.
#4 dairy fnish Used on any surface, stainless steel is polished to sanitary standards, with 180 grit abrasives.
#5 fnish Used on stainless steel tubing, only the OD is polished. The ID is unpolished.
#7 fnish Used on stainless steel tubing polished to sanitary standards inside and outside.
3A Symbol Introduced in 1956, the 3A Symbol is a registered trademark used to identify equipment that meets 3A
Sanitary Standards for design and fabrication. The 3A Symbol on dairy and food equipment serves
three important purposes:
1. assures processors that equipment conforms to sanitary standards
2. provides accepted criteria to equipment manufacturers for sanitary design
3. establishes guidelines for uniform evaluation and compliance by sanitarians
3A Finish Product surface fnish equivalent to 150 grit or better OD, and 180 grit or better ID. A maximum of Ra
32 microinch (0.8 micron) is indicated.
ABS (Acrylicnitrile-butadiene-styrene) a thermoplastic resin with an excellent resistance to acids, bases,
salts and some solvents. It is heat resistant to 230°F.
ANSI American National Standards Institute, Inc.
ASME American Society of Mechanical Engineers
ASTM American Society for Testing and Materials
Acme Thread A fat grooved helical ridge on a nut or bolt. This typically has a 29° included angle. Used on bevel
seat and John Perry fttings
Anneal Stress relief of stainless steel, a heat treatment to remove the stresses generated in forming and
welding operations. This heat treatment is best done under controlled atmosphere or vacuum to
maintain the mill fnish. The fttings are not quenched, as in solution annealing; this would reintroduce
residual stresses. Done correctly, parts are processed to provide minium residual stresses and full
corrosion resistance.
Bevel Seat Ferrules A set of plain (male) and externally threaded (female) bushings with matching bevel angles that
produce a leak-proof seal when connected with a hex union nut. The threads used are Acme form.
Bright Anneal Annealing in a protective medium to prevent discoloration of the surface.
Bright Annealed Finish A silvery satin surface, approximately the mill fnish of stainless steel.
Buna Synthetic rubber, a copolymer of acrylonitrile and butadiene
Burst Pressure The pressure at which rupture occurs.
CW Clockwise
CCW Counter clockwise
Clamp A device used to join mechanical parts, fttings, ensuring a quick leak-proof connection and enabling
easy take down.
Cold Flow Continued deformation or movement of rubber or PTFE under stress.
Compression Set The deformation that remains in rubber or PTFE after it has been subjected to and released from
stress such as a clamp. The longer the stress is maintained the more defnitive the deformation.
Durometer An instrument for measuring the hardness of rubber by resistance to penetration
Durometer Hardness A numerical value which indicates the resistance to indentation of the blunt indentor of the durometer.