4.1.2 Specific Design Requirements for Mechanical Conveying Equipment

4.1.2.1 Buckets shall be of seamless construction. Spaces between buckets and chain or carrier belts shall not be less than 1⁄4 inch (6mm).

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4.1.2.2 Drag-chain conveyors shall not be permitted.

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4.1.3 Specific Design Requirements for Pneumatic Conveying Equipment

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4.1.3.1 Straight runs of pneumatic conveyors, valves and rotary feeders shall comply with the provisions of Sections 3.1 and 3.2 except that piping, tubing, valves or feeders which are self-purging shall be exempt for the requirements of accessibility.

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4.1.3.2 The entire pneumatic conveyor system shall be dust and watertight.

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4.1.3.3 Vent openings shall be protected with filters.

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4.1.3.4 Air supply for blowers or compressors shall be filtered to exclude particles of 5 microns or larger.

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4.1.4 Specific Design Requirements for Sifters

4.1.4.1 Separate conveying air systems shall be provided before and after an atmospheric sifter in the system.

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4.1.4.2 Sifters shall permit continuous discharge of tailings through dust-tight connections to an enclosed container.

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4.1.4.3 Sifters shall employ no rubbing action to facilitate product flow.

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4.1.4.4 Sifter screen frames shall be designed to prevent replacement in an improper position and shall be readily removable for cleaning

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4.1.4.5 Sifter screens shall be minimum mesh to allow passage of product.

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4.1.5 Specific Design Requirements for Weigh Hoppers

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4.1.5.1 A removable flexible connection shall be provided between the inlet to the hopper and the product delivery equipment

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4.1.5.2 Scale beam or dial housings shall be closed or constructed with an open bottom so as not to form a dirt-collecting pocket.

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4.1.6 Specific Design Requirements for Dump Bins

4.1.6.1 The bag rest shelf shall either be readily removable or there shall be a minimum of 2 inches (50mm) open space between the shelf and the housing. It shall be a minimum of 2 inches (50mm) lower than the edge of the dump opening of the bin or housing.

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4.1.6.2 Protective grids shall be readily removable.

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4.1.6.3 Covers or doors shall be provided to enclose the product zone.

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4.1.6.4 Skirts or aprons shall not be used as exterior trim.

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4.1.7 Specific Design Requirements for Storage and Portable Bins

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4.1.7.1 Cages used for bin cleaning shall be designed and constructed of round metal except for the floor, which may be constructed of flat bars installed on edge.

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4.1.7.2 Auxiliary agitators shall be designed and constructed to be smooth, crevice-free and readily accessible.

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4.1.7.3 Access openings shall be provided in all storage bins. The openings shall be at least 18 inches (460mm) in its smaller dimension and shall have exterior rims raised at least 1 inch (25mm). Covers or filters for all openings shall be designed to permit ready replacement and sealing. Bins shall have an access opening not more than 48 inches (1.25 meter) above the discharge opening.

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4.1.8 Specific Design Requirements for Transport Vehicles

4.1.8.1 If the vehicle is pneumatically discharged, the air supply shall be filtered so as to remove particles of 5 microns or larger, and the filters shall be accessible for inspection and cleaning.

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4.1.8.2 Discharge piping and unloading hoses shall comply with provisions of Section 4.1.3 of this standard.

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4.1.8.3 Discharge piping and unloading hoses shall be equipped with caps.

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4.1.8.4 Unloading hoses, if carried, shall be carried in an enclosed space, which is accessible and completely drainable.

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4.1.8.5 Rail car unloaders shall comply with Sections 4.1.2 and 4.1.3 of this standard, whichever is appropriate.

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4.1.8.6 Air relief assemblies shall be accessible for inspection and cleaning.

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4.1.8.7 All joints in bulk railroad cars shall be welded and made smooth. Joints between the sides and hopper sheets are exempted from the requirement for butt welding.

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4.1.8.8 The delivery vehicles shall be constructed of a non-corrosive, food grade material or coated on the interior surface (food contact surface) with an appropriate food grade non-toxic material.

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4.1.9 Specific Design Requirements for Reclaiming Systems

4.1.9.1 Ingredient reclaiming systems shall be designed and constructed to be cleanable or readily accessible.

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4.1.9.2 Dust shall be collected and contained for easy disposal.

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