4.19.1 DESIGN REQUIREMENTS FOR SPIRAL MIXERS
4.19.1 Specific Design Requirements
4.19.1.1 Agitators and agitator shaft assemblies within the product
zone shall be readily accessible for cleaning.
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4.19.1.2 When agitators are assembled by joining, the joints
shall be closed and the surfaces ground flush and free of crevices.
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4.19.1.3 Agitator hubs and spacing collars shall have matched
diameters and faces to afford a tight fit and to eliminate
the formation
of a shoulder where the hubs are joined. Set screws shall not
be used.
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4.19.1.4 Drip protection shall be provided to prevent lubricant
from entering the product zone.
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4.19.1.5 Liquid ingredient inlet lines shall terminate not
less than 1 inch (25mm) or twice the inlet pipe diameter,
whichever is greater, above the over-flow level of the
bowl when in position
for mixing.
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4.19.1.6 Liquid ingredient inlet pipes, valves and fittings
shall be of sanitary take-apart design and shall be removable
for cleaning,
back to the point where the line is normally continuously
filled. Check valves shall not be permitted. Terminal
lengths of such
pipe lines shall be self-draining.
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4.19.1.7 Covers shall be provided on the mixer to cover
the bowl during mixing. All openings shall have a raised
rim
at least
3/8 inch (10mm).
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