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2 Pipe, Pipe Columns, Bollards ASTM A 53, Type E or S, Grade B <br /> Standard weight unless noted otherwise <br /> 3. Tubes ASTM A 500 Grade B <br /> B. Corrosion Protection: Unless otherwise indicated, miscellaneous metalwork of <br /> fabricated steel, which will be used in a corrosive environment and/or will be <br /> submerged in water shall be coated in accordance with Section 09900 - Painting <br /> and Coating and shall not be galvanized prior to coating. All other miscellaneous <br /> steel metalwork shall be hot-dip galvanized after fabrication. <br /> C. Stainless Steel: Unless otherwise indicated, stainless steel metalwork and bolts <br /> shall be of Type 316 stainless steel and shall not be galvanized. <br /> D. Aluminum: Unless otherwise indicated, aluminum metalwork shall be of Alloy <br /> 6061-T6. Aluminum in contact with concrete, masonry, wood, porous materials, or <br /> dissimilar metals shall have contact surfaces coated in accordance with System <br /> No. 10, Section 09900. <br /> E. Cast Iron: Unless otherwise indicated, iron castings shall conform to the <br /> requirements of ASTM A 48, Class 50B or better. <br /> 2.02 LADDERS <br /> A. Ladders which may be partially or wholly submerged, or which are located inside <br /> a hydraulic structure, shall be entirely of Type 304L stainless steel. All other <br /> ladders shall be of galvanized steel. <br /> B. Every ladder that does not have an exterior handhold shall be equipped with a <br /> pop-up extension. Pop-up extension device shall be manufactured of the same <br /> material and finish as the ladder with telescoping tubular section that locks <br /> automatically when fully extended. Upward and downward improvement shall be <br /> controlled by stainless steel spring balancing mechanisms. Units shall be <br /> completely assembled with fasteners for securing to the ladder rungs in <br /> accordance with the manufacturer's instructions. <br /> 2.03 METAL GRATING <br /> A. General <br /> Metal grating shall be of the design, sizes, and types indicated. All grating shall be <br /> completely banded at all edges and cutouts using material and cross section equivalent <br /> to the bearing bars. Such banding shall be welded to each cut bearing bar. Grating <br /> shall be supported on all sides of an opening by support members. Where grating is <br /> supported on concrete, embedded support angles matching grating material shall be <br /> used on all sides, unless indicated otherwise. Such angles shall be mitered and welded <br /> at corners. <br /> 1. All pieces of grating shall be fastened in two locations to each support. <br /> 2. Where grating forms the landing at the top of a stairway, the edge of the <br /> grating, which forms the top riser, shall have an integral non-slip nosing, <br /> width equal to that of the stairway. <br /> July 2007 Division III-96 NEI Phase II Water and Sewer <br /> CIP Nos. 7468, 7589, 7590 <br />