Pipe with helical corrugations shall have a continuous seam extending from end to end of each length of pipe section. Helical seams shall be fabricated in such a manner that they will develop the full strength of the pipe and not affect shape or nominal diameter of the pipe. Folded lock seams or ultra-high frequency resistance butt-welded seams shall be used. Folded lock seams shall be formed with sufficient pressure to prevent any seam slippage that would appreciably affect the load carrying capacity of the pipe but without damaging the metal to such an extent that a plane of weakness is created. The metal used in fabricating lock seams shall be one that will permit cold forming without such damage. Welded seams shall be controlled such that the combined width of the weld and adjacent spelter coating burned by welding does not exceed three times the metal thickness. If the spelter is damaged by the welding outside the above specified area, the weld and damaged spelter adjacent to the weld shall be cleaned and painted as specified in AASHTO Designation M-36. (d) Special sections, such as elbows and prefabricated flared end sections, shall conform to the applicable requirements of AASHTO M 36 or AASHO M218. Coupling bands shall conform to AASHTO M 36 and M 218, except that the minimum width shall be 12 inches (305 mm). Steel sheets of the required composition may be furnished with commercially produced corrugation dimensions other than those specified in AASHTO M 36, if shown on the plans or approved by the Engineer. 707.03 Bituminous Coated Corrugated Iron or Steel Pipe and Pipe Arches. These conduits and the coupling bands shall conform to the requirements of AASHTO M-190. The coating shall be Type A, B, or C as specified. Coupling bands shall be fully coated with bituminous material. Special sections, such as elbows and prefabricated flared end sections, shall conform to the applicable requirements of AASHTO M–190. Coating and invert paving shall be of the type specified. Flared end sections shall conform to the requirements of AASHTO M-243 or M-190, for the coating specified. The Engineer may waive the imperviousness test for coated pipe if no separation of coating from metal is observed. When asbestos bonded bituminous coating is specified these requirements shall equally apply and in addition the special process of embedding asbestos fiber in the molten metallic bonding medium shall be used to bond the bituminous coating. Asbestos-bonded corrugated metal pipe shall be fabricated in accordance with AASHTO M 36 using asbestos-bonded sheets of base metal specified therein. Both sides of the metal sheets shall be coated with a layer of asbestos fibers pressed into the molten zinc bonding medium. Immediately after the metallic bond has solidified, the asbestos fibers shall be thoroughly impregnated with a bituminous saturant. The finished sheets shall be uniformly coated and free from blisters. After fabrication, the culvert sections shall be treated as specified for either Type A, B, or C, as called for in the bid schedule, in accordance with AASHTO M 190. Coupling bands shall conform to AASHTO M 36, except that all bands shall be not less than 12 inches (305 mm) wide. 707.04 Corrugated Iron or Steel Pipe for Underdrains. This pipe shall conform to the requirements of AASHTO M 36 and M218 for the specified diameters and types. Galvanized metal part-circle pipe may be used if permitted by the special provisions and shown in the bid schedule. 707.05 Bituminous Coated Iron or Steel Pipe for Underdrains. This pipe shall conform to the requirements of AASHTO M36 and M218 and shall be coated with bituminous material to meet requirements of AASHTO M 190, Type A coating, except that minimum coating thickness shall be 0.03-inch (0.76 mm). Coupling bands shall be fully coated. The specified minimum diameter of perforations shall apply after coating. The Engineer may waive the imperviousness test if no separation of coating from metal is observed. 707.06 Corrugated Aluminum Alloy Culvert Pipe. This shall conform to the requirements of AASHTO M 196 and M 197. 707.07 Corrugated Aluminum Alloy Pipe for Underdrains. This pipe shall conform to the requirements of AASHTO M 197. 707.08 Bituminous Coated Corrugated Aluminum Alloy Culvert Pipe. This pipe shall conform to the requirements of AASHTO M 196 or M 197 and shall be coated with bituminous material conforming to the requirements of AASHTO M 190. Coating and invert paving shall be of the type specified. 707.09 Bituminous Coated Corrugated Aluminum Alloy Pipe Underdrain. This pipe shall conform to the requirements of AASHTO M 196 and AASHTO M 197 and shall be coated with bituminous material conforming to the requirements of AASHTO M 190, type coating as specified. 707.10 Structural Plate for Pipe, Pipe Arches, and Arches. These conduits and bolts and nuts for connecting plates shall conform to the requirements of AASHTO M 167. 707.11 Full Bituminous Coated Structural Plate Pipe, Pipe Arches, and Arches. These conduits shall conform to the requirements of AASHTO M 167 and shall be coated with bituminous material conforming to the requirements of AASHTO M 243, type coating as specified. 707.12 Aluminum Alloy Structural Plate for Pipe, Pipe Arches, and Arches. These conduits and the bolts and nuts for connecting plates shall conform to the requirements of AASHTO M 219. 707.13 Full Bituminous Coated Aluminum Alloy Structural Plate Pipe, Pipe Arches and Arches. These conduits shall conform to the requirements of AASHTO M 219 and shall be coated with bituminous material conforming to AASHTO M 190, type coating as specified. Section 708.-PAINTS 708.01 Guard Rail Paint (wood members) (a) Rustic guard rail paint shall be a creosote stain of commercial quality, satisfactory to the Engineer. (b) Sawed posts and rails.-White paint for posts and rails other than rustic shall conform to the requirements of AASHTO M 70. Black paint shall consist of lampblack ground in oil and mixed to the required consistency with pure raw linseed oil. Lampblack shall conform to the requirements of ASTM D 209 and linseed oil shall conform to the requirements of Federal Specification TT-L-215. 708.02 Paint for Timber Structures. Paint for timber structures shall conform to AASHTO M 70, type I, class B. The paint as specified is intended for use in covering previously painted surfaces. When it is applied to unpainted timber, turpentine and linseed oil shall be added as required by the character of the surface in an amount not to exceed 1 pint each per gallon (0.473 dm3 per 3.785 dm3) of the paint. The paint shall be white unless otherwise specified. 708.03 Paint for Steel Structures. All paint furnished must be shipped in strong, substantial containers, plainly marked with the name, weight, and volume of paint content, together with the color, formula, and the name and address of the manufacturer. Paint shall be of the type shown on the plans or in the special provisions. Except as otherwise required in the cited specifications, all paint shall meet the following general requirements: (1) The paint shall not show excessive settling in a freshly-opened full can, and shall easily be redispersed with a paddle to a smooth, homogeneous state. The paint shall show no curdling, livering, caking or color separation, and shall be free from lumps and skins. (2) The paint as received shall brush easily, possess good leveling properties, and show no running or sagging tendencies when applied to smooth steel vertical surfaces. (3) The paint shall not skin within 48 hours in a three-quarters filled closed container. (4) The point shall dry to a smooth uniform finish, free from roughness, grit, uneveness, and other surface imperfections. The paint shall show no steaking or separation when flowed on clean glass. (5) The paint shall show no thickening, curdling, gelling, or hard caking after six months storage in a full, tightly-covered container at a temperature of 70° F (21 t° c) to 90° F (32 t° c). (6) All vehicles shall be free from rosin and rosin derivatives. They may contain addition agents such as anti-skinning and wetting aids. Paint shall conform to the requirements of the indicated specifications as follows: Red lead ready-mixed paint AASHTO M 72 Raw material constituents of red lead-iron oxide paint shall conform to the requirements of the indicated specifications as follows: Red lead pigment--- Magnesium silicate Fed. Spec. TT-R-191 Type 1, Grade 97. Fed. Spec. TT-L-215. III. Iron oxide shall be a siliceous type of red iron oxide, free of calcium sulfate, containing not less than 85 percent of Fe2O2. Red lead-iron oxide paint will be tested in accordance with applicable methods of Federal Standard No. 141. Basic lead silico-chromate paints shall comply with these requirements: (a) The raw materials used in the formulation of these paints shall comply with these specifications: Lampblack.. Magnesium silicate Basic lead silico- Phthealocyanine blue morillonite ASTM D 209. ASTM D 600. Fed. Spec. TT-P-403. Fed. Spec. TT-L-215. Fed. Spec. TT-R-266, Type I. ASTM D 1648. Fed. Spec. TT-T-291. Fed. Spec. TT-P-442, Type III. Fed. Spec. TT-P-347. An organic ammonium com- The color of each paint shall be in accordance with the requirements of the special provisions. (b) Specific requirements: (1) The primer coat shall be a basic lead silico-chromate orange primer meeting the requirements of Federal Specification TT-P-615, Type I, with 5 percent iron oxide added to the pigment. (2) The intermediate coat shall be basic lead silico-chromate buff paint meeting these requirements: |