ITEM #603233A – GALVANIZING STRUCTURAL STEEL (SITE NO. 1)
Description: Work under this item shall consist of surface preparation and hot-dip galvanizing of the structural steel members and components as shown on the plans, as directed by the Engineer and in accordance with these specifications
Materials: The materials for this work shall conform to the requirements of ASTM A123.
Construction Methods: Before hot-dip galvanizing, the galvanizing tanks shall be cleaned to remove surface and bottom contamination, i.e. dross, sludge, ash and flux.
The structural steel members and components shall be single dip hot-dip galvanized by completely submerging them in the galvanizing tank.
The structural steel members and components shall be hot-dip galvanized, after fabrication, in accordance with ASTM A123 amended as follows:
Subarticles 5.2, 5.3 and 7.3 shall be amended as follows:
Finish – add the following:
The coating shall be continuous, smooth and uniform in thickness and shall be inspected by visual means with the aid of straight edge and dry film thickness instruments. The overall dry film thickness shall be 3.4 - 8.0 mils.
Appearance – add the following:
Galvanized articles shall be free from uncoated areas, blisters, flux deposits, acid and black spots, and dross inclusions. Lumps, projections, globules, or heavy deposits of zinc will not be permitted. All holes shall be clean and free of excess zinc.
Finish and Appearance – add the following:
Inspection shall be visual with the aid of straight edge instruments to determine compliance with the requirements of 5.2 and 5.3. Articles that have a nonuniform, rough coating shall be ground smooth with power tools such as disc grinders. If grinding has been performed, he resultant surface shall comply with 5.2 and 5.3 .
The members and components shall be handled so that after galvanizing they will not freeze together on cooling.
The galvanized members and components shall be stored, at the fabricator, galvanizer and at the construction site, off the ground, with adequate spacers to promote ventilation between pieces and at a slight inclination to promote drainage to prevent wet storage stains.
All damage, (i.e., scratches, nicks, cracks), on the hot-dip galvanized steel shall be repaired in accordance with ASTM A 780 Annex A2 "Repair using Zinc-Rich Paints". The zinc-rich paint shall conform to Federal Specification TT-P-641 Type 1 and shall be brush applied with a dry film thickness range of 4 to 6 mils.
Method of Measurement: This item, being paid for on a lump sum basis, will not be measured for payment.
Basis of Payment: This work will be paid for at the contract lump sum price for "Galvanizing Structural Steel (Site No. 1)", complete and accepted, which price shall include all materials, equipment, tools, and labor incidental thereto.
ITEM #603233A