Laserfiche WebLink
Permit No. C('NR 1J0216t\ <br /> Page 9 or 9 <br /> CONTRACTOR OCCUPANCY/ACCESS AGREEMENT <br /> EXHIBIT"D" <br /> MINIMUM«'ALL THICKNESS FOR CASING PIPES UNDER RAILROAD TRACKS <br /> 1.STEEL CASING PIPE WME.A.SPEC.1964) <br /> NOMINAL DIAMETER NOMINAL WALL THICKNESS <br /> (Inches) (Inches) <br /> PROTECTED NOT PROTECTED* <br /> Under 14 0.188 0.188 <br /> 14 and 16 0 2I9 0,281 (9/32) <br /> 18 0.250 0.312 <br /> 20 a.2s <br /> .344 <br /> 22 0.312 0.375 <br /> 24 0 344 1,406 <br /> 26 0.375 0.438 <br /> 28 and 30 0.406 0.469 <br /> 32 0.438 0.500 <br /> 34 and 36 0 469 0.531 <br /> 38,40 and 42 0.500 0.562 <br /> Steel Pipe shall have a minimum yield strength of 35,000 psi. <br /> *When casing is installed without benefit of a protective coating and said casing is not cathodically protected,the wall <br /> thickness shall be increased to the nearest standard size which is a minimum of 0.063 inches greater than the thickness <br /> shown for protected pipe except for diameters under 12.75 inch. <br /> 2.CONCRETE PIPE <br /> All diameters of concrete pipe under main tracks shall be specified,as A.S.T.M.C-76(Latest Revision)Table V.Concrete <br /> pipe under siding and yard tracks may be Table IV(either Wall"B"or"C"is acceptable). <br /> 3.CORRUGATED METAL PIPE <br /> Table shows permissible minimum and maximum height of cover for both riveted and helical pipe. <br /> NOMINAL DIAMETER <br /> (Inches) 16 GAGE 14 GAGE 12 CYAGE <br /> 12 4-53(ft) 4-80(ft) <br /> 15 4-42 4-64 <br /> 18 4-34 4-53 <br /> 21 4-28 4-45 4-79(ft) <br /> 24 5-23 4-40 4-70 <br /> 30 4-31 4 56 <br /> 36 5-23 4-46 <br /> 42 4-49 4-78 <br />