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Designation: A 760/A 760M 01American Association State Highway and Transportation Officials Standard AASHTO No. M 36/M 36M Standard Specifi cation for Corrugated Steel Pipe, Metallic-Coated for Sewers and Drains1 This standard is issued under the fi xed designationA760/A 760M; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense. 1. Scope 1.1 This specifi cation covers corrugated steel pipe intended for use for storm water drainage, underdrains, the construction of culverts, and similar uses. Pipe covered by this specifi cation is not normally used for the conveyance of sanitary or industrial wastes. The steel sheet used in fabrication of the pipe has a protective metallic coating of zinc (galvanizing), alumi- num, 55 % aluminum-zinc alloy, or zinc-5 % aluminum- mischmetal alloy. 1.1.1 Steel sheet with zinc and aramid fi ber composite coating may be specifi ed for fabrication of pipe. Pipe made from sheet with this composite coating is always furnished with an asphalt coating. Therefore, the requirements in this specifi cation should be considered as applying to a semifi n- ished pipe; the fi nished pipe must include provisions of Specifi cation A 849. NOTE 1Pipe fabricated with zinc and aramid fi ber composite coated sheet and asphalt post coating may be used for sanitary sewers and industrial applications. Petroleum products or similar materials in the sewer effluent may affect the performance of the asphalt coating. 1.2 The several different metallic coatings may not provide equal protection of the base metal against corrosion or abrasion in all environments, or both. Some environments may be so severe that none of the metallic coatings included in this specifi cation will provide adequate protection. Additional pro- tection for corrugated steel pipe can be provided by use of coatings applied after fabrication of the pipe as described in Specifi cationA 849, or by use of polymer precoated corrugated steel pipe as described in Specifi cation A 762/A 762M. 1.3 This specifi cation does not include requirements for bedding, backfi ll, or the relationship between earth cover load and sheet thickness of the pipe. Experience has shown that the successful performance of this product depends upon the proper selection of sheet thickness, type of bedding and backfi ll, controlled manufacture in the plant, and care in the installation. The installation procedure is described in Practice A 798. 1.4 This specifi cation is applicable to orders in either inch-pound units as A 760 or in SI units as A 760M. Inch- pound units and SI units are not necessarily equivalent. SI units are shown in brackets in the text for clarity, but they are the applicable values when the material is ordered to A 760M. 2. Referenced Documents 2.1 ASTM Standards: A 90/A 90M Test Method for Weight Mass of Coating on Iron and Steel Articles with Zinc or Zinc-Alloy Coatings2 A 153/A 153M Specifi cation for Zinc Coating (Hot-Dip) on Iron and Steel Hardware2 A 307 Specifi cation for Carbon Steel Bolts and Studs, 60 000 psi Tensile Strength3 A 428/A 428M Test Method for Weight of Coating on Aluminum-Coated Iron or Steel Articles2 A 449 Specifi cation for Quenched and Tempered Steel Bolts and Studs3 A 563 Specifi cation for Carbon and Alloy Steel Nuts3 A 563M Specifi cation for Carbon and Alloy Steel Nuts Metric3 A 762/A 762M Specifi cation for Corrugated Steel Pipe, Polymer Precoated for Sewers and Drains2 A 780 Practice for Repair of Damaged and Uncoated Areas of Hot-Dip Galvanized Coatings2 A 796/A 796M Practice for Structural Design of Corru- gated Steel Pipe, Pipe-Arches, and Arches for Storm and Sanitary Sewers and Other Buried Applications2 A 798/A 798M Practice for Installing Factory-Made Corru- gated Steel Pipe for Sewers and Other Applications2 A 849 Specifi cation for Post-Applied Coatings, Pavings, and Linings for Corrugated Steel Sewer and Drainage Pipe2 A 885/A 885M Specifi cation for Steel Sheet, Zinc and Ara- mid Fiber Composite Coated for Corrugated Steel Sewer, Culvert, and Underdrain Pipe2 1 This specifi cation is under the jurisdiction of ASTM Committee A05 on Metallic-Coated Iron and Steel Products and is the direct responsibility of Subcom- mittee A05.17 on Corrugated Steel Pipe Specifi cations. Current edition approved April 10, 2001. Published June 2001. Originally published as A 760 79. Last previous edition A 760/A 760M 00. 2Annual Book of ASTM Standards, Vol 01.06. 3Annual Book of ASTM Standards, Vol 01.08. 1 Copyright ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States. NOTICE: This standard has either been superseded and replaced by a new version or discontinued. Contact ASTM International () for the latest information. A 929/A 929M Specifi cation for Steel Sheet, Metallic- Coated by the Hot-Dip Process for Corrugated Steel Pipe2 B 633 Specifi cation for Electrodeposited Coatings of Zinc on Iron and Steel4 B 695 Specifi cation for Coatings of Zinc Mechanically Deposited on Iron and Steel4 C 443 Specifi cation for Joints for Circular Concrete Sewer and Culvert Pipe, Using Rubber Gaskets5 C 443M Specifi cation for Joints for Circular Concrete Sewer and Culvert Pipe, Using Rubber Gaskets Metric5 D 1056 Specifi cation for Flexible Cellular Materials Sponge or Expanded Rubber6 F 568M Specifi cation for Carbon andAlloy Steel Externally Threaded Metric Fasteners3 2.2AASHTO Standards: T241 Test for Helical Continuous Welded Seam Corrugated Steel Pipe7 T249 Test for Helical Lock Seam Corrugated Pipe7 3. Terminology 3.1 Defi nitions of Terms Specifi c to This Standard: 3.1.1 fabricatorthe producer of the pipe. 3.1.2 manufacturerthe producer of the sheet. 3.1.3 minimized coating structure a coating characterized by a fi ner metallurgical coating structure obtained by a treat- ment designed to restrict the formation of the normal coarse- grain structure formed during solidifi cation of the Zn-5Al-MM alloy coating. 3.1.4 purchaserthe purchaser of the fi nished product. 3.1.5 regular coating structure the normal coating struc- ture resulting from unrestricted grain growth during normal solidifi cation of the Zn-5 Al-MM alloy coating. 3.2 Abbreviations: 3.2.1 55 Al-Zn55 % aluminum-zinc. 3.2.2 MMmischmetal. 3.2.3 Zn-5 Al-MMzinc-5 % aluminum-mischmetal. 4. Classifi cation 4.1 The corrugated steel pipe covered by this specifi cation is classifi ed as follows: 4.1.1 Type IThis pipe shall have a full circular cross section, with a single thickness of corrugated sheet, fabricated with annular (circumferential) or helical corrugations. 4.1.2 Type IAThis pipe shall have a full circular cross section, with an outer shell of corrugated sheet and an inner liner of smooth (uncorrugated) sheet, fabricated with helical corrugations and lock seams. 4.1.3 Type IRThis pipe shall have a full circular cross section with a single thickness of smooth sheet, fabricated with helical ribs projecting outwardly. 4.1.4 Type IIThis pipe shall be a Type I pipe which has been reformed into a pipe-arch, having an approximately fl at bottom. 4.1.5 Type IIAThis pipe shall be a Type IApipe which has been reformed into a pipe-arch, having an approximately fl at bottom. 4.1.6 Type IIRThis pipe shall be a Type IR pipe which has been reformed into a pipe-arch, having an approximately fl at bottom. 4.1.7 Type IIIThis pipe, intended for use as underdrains or for underground disposal of water, shall be a Type I pipe which has been perforated to permit the infl ow or outfl ow of water. 4.1.8 Type IIIAThis pipe, intended for use as underdrains, shall consist of a semicircular cross section, having a smooth (uncorrugated) bottom with a corrugated top shield. 4.2 Perforations in Type III pipe are included in three classes as described in 8.3.2. 4.3 Zn-5 Al-MM alloy-coated material is available in two coating classes, or structures, as follows: 4.3.1 Class AMinimized coating structure. 4.3.2 Class BRegular coating structure. 5. Ordering Information 5.1 Orders for material to this specifi cation shall include the following information as necessary, to adequately describe the desired product. 5.1.1 Name of material (corrugated steel pipe), 5.1.2 Type of metallic coating (zinc, aluminum, 55 Al-Zn alloy, Zn-5 Al-MM alloy, or zinc and aramid fi ber composite coating (see 6.1). For Zn-5A1-MM coating, the class coating structure (Class A minimized, etc.) (4.3). 5.1.3 ASTM designation and year of issue, as A 760-_ for inch-pound units or as A 760M-_ for SI units. 5.1.4 Type of pipe (4.1), 5.1.5 Diameter of circular pipe (Table 1), or span and rise of pipe-arch section (Tables 2-9), 5.1.6 Length, either total length or length of each piece and number of pieces, 5.1.7 Description of corrugations (7.2), 5.1.8 Sheet thickness (8.1.2), 5.1.9 For Type I and Type II pipe, the pipe fabrication method, whether with annular corrugations or helical corruga- tions (see 7.1.1), NOTE2Pipe with annular corrugations with spot welded or riveted seams is designed by different criteria compared to pipe with helical corrugations. Pipe with annular corrugations must consider seam strength. Therefore, consideration of the method of fabrication is important when pipe is installed under certain conditions of loading. 5.1.10 When zinc and aramid fi ber composite coated sheet is used for fabrication of pipe, the type of asphalt coating (1.1.1 and 8.5), NOTE 3See Specifi cation A 849 for additional ordering information appropriate to post-coatings on pipe. 5.1.11 Joining systems, including the type of joint from 9.1 and gasket, if required (If no joining system is specifi ed, the fabricator shall select the system.), 5.1.12 For Type III pipe, class of perforations, if other than Class 1 (8.3.2), 5.1.13 Certifi cation, if required (14.1), and 5.1.14 Special requirements. 4Annual Book of ASTM Standards, Vol 02.05. 5Annual Book of ASTM Standards, Vol 04.05. 6Annual Book of ASTM Standards, Vol 08.01. 7Available from American Association of State Highway and Transportation Officials, 444 N. Capitol, Washington DC 20001. A 760/A 760M 2 6. Materials and Manufacture 6.1 Steel Sheet for PipeAll pipe fabricated under this specifi cation shall be formed from zinc-coated sheet, aluminum-coated sheet, 55 % aluminum-zinc alloy-coated sheet, zinc-5 % aluminum-mischmetal alloy-coated sheet all conforming to Specifi cation A 929/A 929M, or zinc and ara- mid fi ber composite coated sheet conforming to Specifi cation A 885. If the type of metallic coating is not stated in the order, zinc-coated sheet conforming to Specifi cation A 929/A 929M shall be used. All pipe furnished on the order shall have the same metallic coating, unless otherwise specifi ed. 6.2 Steel Sheet for Coupling BandsThe sheet used in fabricating coupling bands shall have the same coating and shall conform to the same specifi cation listed in 6.1 as that used for fabrication of the pipe furnished under the order. 6.3 RivetsThe rivets used in riveted pipe shall be of the same material as the base metal specifi ed for the corrugated TABLE 1 Pipe Sizes Nominal Inside Diameter Corrugation SizesARibbed Pipe Minimum Outside CircumferenceB in.mm 112by 14in. 38 by 6.5 mm 223by 12in. 68 by 13 mm 3 by 1 in. 75 by 25 mm 5 by 1 in. 125 by 25 mm 34by34by 712in. 19 by 19 by 190 mm 34by 1 by 1112in. 19 by 25 by 292 mm 34by 1 by 812in. 19 by 25 by 216 mm in.mm 4100X11.4264 6150X17.7441 8200X24.0598 10250X30.2755 12300XX36.5912 15375XX46.01148 18450XXXXX55.41383 21500XXXX64.81620 24600XXXX74.21854 27675XXXX83.62091 30750XXXX93.12483 33825XXXX102.52561 36900XXXXXX111.92797 421050XXXXXX130.83269 481200XXXXXX149.63739 541350XXXXXX168.44209 601500XXXXXX187.04675 661650XXXXXX205.75142 721800XXXXXX224.35609 781950XXXXXX243.06075 842100XXXXXX261.76542 902250XXXXX280.37008 962400XXXXX299.07475 1022550XXXXX317.67941 1082700XXXXX336.38408 1142850XXXX355.08874 1203000XXXX373.69341 1263150XXX392.39807 1323300XXX410.910274 1383450XXX429.610740 1443600XXX448.311207 AAn“ X” indicates standard corrugation sizes for each nominal diameter of pipe. BMeasured in valley of annular corrugations. Not applicable to helically corrugated pipe. TABLE 2Pipe Arch Requirements223by 12-in. Corrugations (A 760) Pipe Arch Size, in. Equivalent Diameter, in. Span,A in. Rise,A in. Minimum Corner Radius, in. Maximum B,Bin. 17 by 131517133514 21 by 1518211536 24 by 182124183714 28 by 2024282038 35 by 243035243912 42 by 293642293121012 49 by 3342493341112 57 by 3848573851312 64 by 43546443615 71 by 4760714771612 77 by 52667752818 83 by 57728357920 AA tolerance of 61 in. or 2 % of equivalent diameter, whichever is greater, is permissible in span and rise. B B is defi ned as the vertical dimension from a horizontal line across the widest portion of the arch to the lowest portion of the base. TABLE 3Pipe Arch Requirements68 by 13-mm Corrugations A 760M Pipe Arch Size, mm Equivalent Diameter, mm Span,A mm Rise,A mm Minimum Corner Radius, mm Maximum B,Bmm 430 by 33037543033075135 530 by 38045053038075155 610 by 46052561046075185 710 by 51060071051075205 780 by 56067578056075225 885 by 61075087063075240 970 by 69082597069075255 1060 by 740900106074090265 1240 by 84010501240840100290 1440 by 97012001440970130345 1620 by 1100135016201100155380 1800 by 1200150018001200180420 1950 by 1320165019501320205460 2100 by 1450180021001450230510 AA tolerance of 625 mm or 2 % of equivalent diameter, whichever is greater, is permissible in span and rise. B B is defi ned as the vertical dimension from a horizontal line across the widest portion of the arch to the lowest portion of the base. A 760/A 760M 3 sheets. They shall be thoroughly galvanized or sherardized. If bolts and nuts are substituted for rivets (see 7.3.1), they shall meet the following requirements: BoltsNuts For A 760 pipeA 449A 563, Grade C For A 760M pipeF 568, Class 8.8A 563M, Class 12 The bolts and nuts shall be hot-dip galvanized in conform- ance with Specifi cation A 153, or be mechanically galvanized in conformance with Specifi cation B 695, Class 40. 6.4 Hardware for Joining SystemsBolts and nuts for coupling bands shall conform to the following requirements: BoltsNuts For A 760 pipeA 307A 563, Grade A For A 760M pipeF 568, Class 4.6A 563M, Class 5 6.4.1 Bolts, nuts, and other threaded items used with joining systems shall be zinc coated by one of the following processes: hot-dip process as provided in Specifi cation A 153/A 153M; electroplating process as provided in Specifi cation B 633, Class Fe/Zn 8; or mechanical process as provided in Specifi - cation B 695, Class 8. Other hardware items used with cou- pling bands shall be zinc coated by one of the following processes: hot-dip process as provided in Specifi cation A 153/ A 153M; electroplating process as provided in Specifi cation B 633, Class Fe/Zn 25; or mechanical process as provided in Specifi cation B 695, Class 25. TABLE 4Pipe Arch Requirements3 by 1-in. or 5 by 1-in. Corrugations (A 760) Pipe Arch Size, in. Equivalent Diameter, in. Span,A in. Rise,A in. Minimum Corner Radius, in. 40 by 313640 1.831 + 1.85 46 by 364246 2.136 + 2.16 53 by 414853 2.441 + 2.47 60 by 465460 2.746 + 2.78 66 by 516066 3.051 + 3.09 73 by 556673 3.355 + 3.312 81 by 597281 3.659 + 3.614 87 by 637887 4.463 + 4.414 95 by 678495 4.867 + 4.816 103 by 7190103 5.271 + 5.216 112 by 7596112 5.675 + 5.618 117 by 79102117 5.979 + 5.918 128 by 83108128 6.483 + 6.418 137 by 87114137 6.987 + 6.918 142 by 91120142 7.191 + 7.118 ANegative and positive numbers listed with span and rise dimensions are negative and positive tolerances, no tolerance in opposite direction. TABLE 5Pipe Arch Requirements75 by 25-mm or 125 by 25-mm Corrugations A 760M Pipe Arch Size, mm Equivalent Diameter, mm Span,A mm Rise,A mm Minimum Corner Radius, mm 1010 by 7909001010 45790 + 45130 1160 by 92010501160 55920 + 55155 1340 by 105012001340 601050 + 60180 1520 by 117013501520 701170 + 70205 1670 by 130015001670 751300 + 75230 1850 by 140016501850 851400 + 85305 2050 by 150018002050 951500 + 95355 2200 by 162019502200 1101620 + 110355 2400 by 172021002400 1201720 + 120410 2600 by 182022502600 1301820 + 130410 2840 by 192024002840 1451920 + 145460 2970 by 202025502970 1502020 + 150460 3240 by 212027003240 1652120 + 165460 3470 by 222028503470 1752220 + 175460 3600 by 232030003600 1802320 + 180460 ANegative and positive numbers listed with span and rise dimensions are negative and positive tolerances, no tolerance in opposite direction. TABLE 6 Pipe-Arch Requirements34by 34by 712-in. Rib Corrugation Pipe-Arch Size, in. Equivalent Diameter, in. Span,A in. Rise,A in. Minimum Corner Radius, in. 20 by 161820 1.016 + 1.05 23 by 192123 1.019 + 1.05 27 by 212427 1.521 + 1.55 33 by 263033 1.526 + 1.55 40 by 313640 1.831 + 1.85 46 by 364246 2.136 + 2.16 53 by 414853 2.441 + 2.47 60 by 465460 2.746 + 2.78 66 by 516066 3.051 + 3.09 73 by 556673 3.355 + 3.312 81 by 597281 3.659 + 3.614 87 by 637887 3.963 + 3.914 95 by 678495 4.267 + 4.216 103 by 7190103 4.571 + 4.516 112 by 7596112 4.875 + 4.818 117 by 79102117 5.179 + 5.118 ANegative and positive numbers listed with span and rise dimensions are negative and positive tolerances; no tolerance in opposite direction. TABLE 7 Pipe-Arch Requirements19 by 19 by 190-mm Rib Corrugation Pipe-Arch Size, mm Equivalent Diameter, mm Span,A mm Rise,A mm Minimum Corner Radius, mm 500 by 410450500 25410 + 25130 580 by 490525580 25490 + 25130 680 by 540600680 40540 + 40130 750 by 620675750 40620 +

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