Cast iron culvert pipes, the castings to be clean and perfectly sound, of the best tough metal, and cast on end. The internal diameter is to be four feet, and the thickness 1½ inches, and the length about 9 feet. They are to be socket pipes, and shall be accurately laid so as to ensure concentricity ; the joints to be yarned, tightly caulked by means of a caulking tool, and leaded with lead of standard weight or lead wool as the case may require.
After the pipes have been laid they shall be subjected to such reasonable tests as the Engineer may direct, and shall be perfectly water and airtight. The pipes are to be held in position by wrot (wrought) iron folding straps, bedded on both sides of pipes and folded over pipes and secured by bolts ... |