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Dixon Sanitary 2014
800.789.1718
Technical
Glossary of Terms
3
A
Symbol for 3A Sanitary Standards Symbol Administrative Council. The 3A Sanitary Standard were created by the dairy
industry as a voluntary benchmark for product performance and sanitary safety. The standard, collaboratively developed by a
group of processors, suppliers, regulatory officials and sanitation specialists, is accepted by federal, state and local regulatory
authorities. Our products have earned the 3A symbol through third party verification. This assessment makes certain each
product conforms in all respects to the published standards. Dixon Sanitary is proud to be a participant in the 3A program.
3
A Finish
Product surface finish 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.
AC
Alternating current. The form in which electricity is delivered to businesses and residences.
AFD
See
VFD
ANSI
American National Standards Institute, Inc.
ASME
American Society of Mechanical Engineers
ASTM
American Society for Testing and Materials
Absolute Pressure
Atmospheric pressure added to gauge pressure.
Acme Thread
A flat grooved helical ridge on a nut or bolt. This typically has a 29° included angle. Used on bevel seat and
John Perry fittings
Adapter
Connects the pump fluid end to the motor
Affinity Laws
Used to predict how capacity, head and horsepower are affected by changes in the centrifugal pump impeller
diameter or impeller speed.
Ambient Temperature
The temperature at a point or area expressed as an average of the surrounding areas or
materials. Ambient surface temperature is generally given to be 70°F to 80°F – an average of daily and seasonal variations.
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 finish. The fittings are not
quenched, as in solution annealing; this would reintroduce residual stresses. Done correctly, parts are processed to provide
minimum residual stresses and full corrosion resistance.
Atmospheric Pressure
Force per unit area exerted against a surface by the weight of the air above that surface. At sea
level, atmospheric pressure is 14.7 PSI.
Automatic Welding
welding with equipment that performs the welding operation without adjustment of the controls by a
welding operator. The equipment may or may not perform the loading and unloading of the work (see also machine welding).
BEP
Best Efficiency Point. The point where the power coming out of the pump (water horsepower) is the closest to the power
coming into the pump (brake horsepower) from the motor. This is also the point where there is no radial deflection of the shaft
caused by unequal hydraulic forces acting on the impeller. Referred to as the sweet spot on the curve.
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