4.18 DESIGN REQUIREMENTS FOR CONTINUOUS MIX EQUIPMENT
4.18.1 Definitions
4.18.1.1 Product zone as defined in Section 2.11 shall include
such accessory equipment as pumps, valves and fittings.
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4.18.2 Specific Design Requirements
4.18.2.1 Product zone surfaces shall be readily accessible or
removable for cleaning.
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4.18.2.2 Permanently joined product zone surfaces with internal
angles less than 135 degrees shall have a radius of not less than
1/4 inch (6mm) except where a small radius is required for proper
mechanical functioning. In such case the radius shall not be less
than 1/32 inch (0.8mm), and cleanable.
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4.18.2.3 Pumps, valves, piping and fittings in the product zone,
including those used to insert thermometer and pressure gauge bulbs,
shall be of the sanitary take-apart type, and shall be readily
accessible and removable for cleaning.
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4.18.2.4 Bearings in the product zone shall be self-lubricating
and readily removable. All surfaces shall be readily accessible.
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4.18.2.5 Shaft seal assemblies and seal rings shall be both readily
accessible and easily retractable, or shall be readily removable
for cleaning.
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4.18.2.6 Shaft seal assemblies shall be designed to provide complete
drainage away from the product zone to prevent accumulation of
foreign material in the event leakage does occur.
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4.18.2.7 Legs shall be of a sanitary design, and shall be free
of pits, crevices, scale, and without exposed threads, and may
be painted.
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4.18.2.8 Skirts or aprons shall be removable.
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