16.3      Mechanical Components

Conform to the following standards of mechanical components for BHS/CBIS for MDOT MAA projects:

A.     The standard baggage clearance shall be 36” above TOB.

B.     The maximum incline or decline angle for all non-tracked conveyors shall be 18°.

C.      The maximum incline or decline angle for all tracked conveyors shall be 15°.

D.     Slider-bed conveyor construction shall be 39” Between Guides (BG).

E.      Oversize Slider-bed conveyor construction shall be 42” BG.

F.      Install brake motors on incline and decline conveyors to keep belts from drifting under load.

G.     Motors/Gearboxes:

1.      For standard drive units, specify right angle drives as first preference.

2.      Where space is constrained, or drive units will not fit on either side of conveyor, use under-slung drives.

3.      All motors shall have a “C” faced flange and be listed and labeled by the Underwriters Laboratories (UL).

4.      All motors shall have “Class F” insulation and shall have a service factor of 1.25

H.     VFD’s shall be utilized on all conveyors upstream of EDS machines, with the possible exception of the take-away conveyors in the public spaces. VFD’s shall be utilized on all conveyors within the CBIS portions of the systems. VFD’s shall be utilized on all conveyors in any tracking zones.

I.       Power Face Diverters (PFD) shall have a minimum throughput of 40 bags per minute and at least 5 years of proven successful operation in conveyor systems.

J.       Tapered side guard guides (wedges) shall be provided for centering bags before EDS. The guides shall be formed with stainless steel, minimum 10-gauge, Type 304 with #4 brushed finished. All connections shall be smooth and flush without openings. The guides shall be provided with all necessary stiffeners.

K.      Vertical Diverters shall have a minimum throughput of 30 bags per minute and at least 5 years of proven successful operation in conveyor systems.

L.      Conveyor support structure shall be designed for a minimum of 183 lbs. per linear foot of live load.

M.    Catwalk alongside conveyors shall be provided where conveyor TOB elevations are greater than 7’-0” AFF. Catwalk shall be of 30” wide with open grating, and fixed kneeling plates at drive locations.

N.     Provide ladders and/or crossovers at all locations identified as bag jam points, at control stations, at conveyor access points, and as required by code to properly access and maintain conveyors.

O.     Handrails shall be provided on all catwalks except where adjacent to conveyor.

P.      Protect all BHS equipment from damage caused by tug/cart movement using guardrails and/or pipe rails.

Q.     Each conveyor section shall be permanently and indelibly marked with its respective number as shown on BHS Contractor’s shop drawings for conveyor identification. Each conveyor number shall be carefully and neatly painted or stenciled in a contrasting color, nominally 4” high, in a conspicuous location on the conveyor drive. Temporary markings on the conveyors or other equipment shall be made with a medium which is readily removable with water or a readily available commercial solvent, such that they may be removed without requiring refinishing of the surface on which they appear.