4.25 DESIGN
REQUIREMENTS FOR KETTLES AND ACCESSORY EQUIPMENT
4.25.1 Specific Design Requirements
4.25.1.1 All internal
angles shall have radii of not less than 1⁄4 inch (6mm) except where a thermometer bulb is installed
in kettle, in which case no soil-retaining crevices shall be formed.
Inlet, thermometer or control openings in the cover or bridge to
which connections are not permanently attached shall be flanged
upward at least 1⁄4 inch (6mm). All pipe lines or accessories
entering through cover or bridge shall be fitted with a sanitary
umbrella deflector that overlaps edges of openings through cover.
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4.25.1.2 Clamp-type covers shall be made of corrosion-resistant
materials, and shall have readily removable bolts or clamps that
are easily cleaned.
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4.25.1.3 All product piping fittings on kettles shall be of sanitary
design and conform to 3-A Standards.
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4.25.1.4 Kettles shall be self-draining and the outlet shall be
of sanitary design. It shall be close coupled, preferably a flush
valve. It shall be close coupled, preferably a flush valve and
shall be easily cleaned.
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4.25.1.5 Agitators permanently mounted through a bridge are not
required to be removable if they do not interfere with drainage
from the kettle and are readily accessible. Drip protection shall
be provided to prevent lubrication from entering the product zone.
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4.25.1.6 The design and construction of the permanently mounted
agitator and shaft assembly shall permit all surfaces to be cleaned
with ordinary cleaning tools, and by washing to ensure complete
removal of all particles of product or ingredient soil.
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4.25.1.7 All surfaces of shaft seal ring assemblies and the surfaces
of the agitator hub shall be accessible or removable.
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4.25.1.8 All packing seals shall be provided with convenient
means for adjustment to prevent leakage, and shall have complete
drainage to the exterior to avoid accumulations of foreign matter
in the event leakage does occur.
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4.25.1.9 For double-motion agitators having a shaft within a
shaft, the seal for the inner shaft shall be above the product
level.
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4.25.1.10 All agitator bars, which are fastened to the inner shaft,
shall be readily removable. Support bars fastened to the outer
shaft shall be permanently joined as provided in Sections 3.1.11
and 3.1.12.
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4.25.1.11 Where agitators are equipped with an outer frame to
which rubber, plastic or other similar scraping edges are attached,
the entire unit shall be constructed so that it can be tilted or
lifted out of the kettle.
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4.25.1.12 Flush bulb sensing devices shall be readily removable.
Instrument wells, through equipment sidewalls, shall be welded.
Level sensors installed on bottom or sidewall should be flush type
to avoid contamination in recessed areas or removable to clean.
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4.25.1.13 Scrapers shall be readily removable from the agitators.
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4.25.1.14 Access openings to the frame equipped with covers or
doors shall permit easy access to all internal surfaces that require
periodic inspection or cleaning, and shall be of adequate size
and convenient arrangements. Hinges, where used, shall be of the
take-apart type.
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4.25.1.15 Bases of kettle frames shall be sealed to or raised
a minimum 6 inches (150mm) above the mounting surface.
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4.25.1.16 When drive
mechanism is supported on a bridge across the top of the kettle,
the support members shall be made of corrosion-resistant
material, and if made of channel, the legs of the channel shall
be turned up. Channel shall be pitched from center to outside for
drainage. All other supports attached to the bridge shall be of
corrosion-resistant material, or shall be provided with a protective
coating. The bridge shall be provided with a minimum radius of
1⁄4 inch (6mm) at its joining to the top side of the kettle.
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4.25.1.17 Convenient access shall be provided for cleaning outside
surfaces of movable or pivoted kettle bowls
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