Dock Port 6" Curved Slat Door    

9.6.1 Doors shall be Alpine’s DocPort Rolling Steel Doors as manufactured by Alpine Overhead Doors, Inc. Doors mounted on exterior walls shall be designed for a proof load of 42 PSF for doors under 40ft. wide, and 30 PSF for doors over 40ft. wide.
9.6.2 Curtain shall consist of interlocking steel slats roll formed in easy curves and designed to present a water shedding surface on the weather side. Slats shall be open hearth steel, hot dip galvanized in accordance with ASTM Standards for 1.75 oz. Class. The slats shall be 14, 16 or 18 gauge with a 6” min. width and a 1-3/16” min. crown. Slats shall be provided alternately with enlocks and windlocks. Both locks shall be of galvanized malleable iron and shall have a baffle to assist in weatherstripping. Locks shall be fastened to slats by four 5/16 carriage bolts. The bottom edge of the curtain shall be reinforced with two angles 2.5x2x3/16 hot dip galvanized with not less than 2 oz. pure zinc per square foot. A looped rubber weatherstrip shall be mounted between the angles for the full width of opening.
9.6.3 Spring Counterbalance. The curtain shall be counterbalanced at everypoint in it’s travel by means of helical torsion springs placed inside the barrel and fixed on each end to anchors, designed to prevent internal collapsing of springs at contact points. The barrel shall be a steel pipe whose deflection under load shall not exceed .03 inch/ft of span, and shall have welded steel plugs at each end.

9.6.4 Supporting Brackets shall be of 3/8” min. steel plate with hood supports. Brackets shall be hot dip galvanized with 2 oz. pure zinc per sq.ft.
9.6.5 Guides shall be composed of 1/4” min. steel angles for doors mounted on exterior walls. The leg of angles forming the guide groove shall be 4” min. in length for doors up to and including 22’-6” and 5” min. for wider doors. Guides shall be equipped with locking bar to engage and retain the windlocks. Guides shall be hot dip galvanized with 2 oz. pure zinc per sq.ft.
9.6.6 Hoods enclosing door coils shall be made of hot dip galvanized sheet metal not lighter than 24 gauge. Hoods for openings over 14ft. in width shall have intermediate supporting brackets placed 10ft. on center.
9.6.7 Bearings. Main door shaft bearings shall be heavy duty precision ball bearings of sealed cartridge type.
9.6.8 Powder Coating. Galvanized surfaces shall be treated for paint adhesion, followed by a zinc dust primer, air dried and painted with a rust inhibiting paint. All other surfaces (except working parts of machinery and other surfaces not normally painted) shall be given a powder coat of rust inhibiting paint.