4.4 DESIGN REQUIREMENTS FOR MECHANICAL WASHERS

4.4.1 Specific Design Requirements

4.4.1.1 The surfaces of the equipment in contact with the items being washed shall be considered product zone and shall comply with the provisions of Section 3.1.

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4.4.1.2 All covers or hatches shall be designed so that when opened or closed, any condensate, wash water or rinse water shall drop within the confines of the tank or housing.

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4.4.1.3 All doors shall be designed so that when closed, condensate, wash water or rinse water shall drip within the confines of the tank or housing and when opened the drippage shall be held to a minimum.

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4.4.1.4 Complete drainage shall be provided for water reservoirs and points in the air handling system where water may collect.

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4.4.1.5 Vent openings shall be provided on the machine for installation of vent fans or duct work.

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4.4.1.6 Curtains shall be made of non-toxic and non-absorbent material and shall be removable and cleanable.

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4.4.1.7 If a hold-down device is used, it should be self-cleaning.

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4.4.1.8 Individual burners shall be protected from drippage by plates extended across the entire width of the burner.

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4.4.1.9 All structural members and braces shall be designed to provide a minimum of horizontal surface.

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4.4.1.10 Fans shall be accessible.

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4.4.1.11 Air ducts shall be provided with openings or removable sections to permit visual inspection and cleaning.

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4.4.1.12 Materials used in air handling equipment and exhaust ducts shall be non-absorbent, non-toxic, odorless, and shall be either corrosion resistant or have a protective coating.

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4.4.1.13 A continuous-type pan washer should have a crumb collector, pre-rinse section, power wash section, water rinse and drying section.

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4.4.1.14 The power wash and rinse sections shall provide sufficient volume, pressure and exposure time, with effective coverage to thoroughly wash and rinse the utensils.

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4.4.1.15 The lowest point of the fresh water inlets on solution tanks shall be located not less than 1 inch (25mm) or twice the fresh water inlet pipe diameter, whichever is greater, above the maximum overflow level of the tank. The inlets shall be placed at a point remote from the overflow. Vacuum breakers will be permitted on inlet lines to prevent siphoning from solution tanks.

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4.4.1.16 Wash and rinse tanks shall have provisions for removing solids.

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4.4.1.17 Pumps and motors shall be mounted in such a way as to provide easy access for cleaning and maintenance. Sump pumps used for returning washing and rinsing solutions to the recirculating tanks shall be mounted so as to remove as much solution from the sump as possible.

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4.4.1.18 Horizontal pumps shall be equipped with drains from pump packing glands.

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4.4.1.19 All spray headers and spray pipes shall be readily accessible and removable. Spray pipes shall have removable end fittings.

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4.4.1.20 Spray nozzles shall be constructed to minimize clogging, and shall be accessible or removable.

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4.4.1.21 The bottom of the scum gutter or skimmer trough of all solution tanks shall slope toward the drain at the rate of 1⁄2 inch (12mm) vertically to 12 inches (300mm) horizontally. A combination overflow and drain stand pipe may be used.

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4.4.1.22 The bottoms of all solution tanks shall slope a minimum of 1⁄4 inch (6mm) vertically to 12 inches (300mm) horizontally to provide for complete drainage. All tank bottoms shall be smooth and slope to the provided drain.

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4.4.1.23 The drains shall be designed and located to ensure complete tank drainage.

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