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PIPE TECHNICAL DATA <br /> •►•II <br /> TABLE 51.3 RATED WORKING PRESSURE <br /> AND MAXIMUM DEPTH OF COVER* <br /> LAYING CONDITION <br /> SIZE IN. PRESSUREt NOMINAL TYPE 1 TYPE 2 TYPE 3 TYPE 4 TYPE 5 <br /> CLASS PSI THICKNESS IN. TRENCH TRENCH TRENCH TRENCH TRENCH <br /> MAXIMUM DEPTH OF COVER IN FT. ++ <br /> 3 350 0.25 78 88 99 ' 100§ 100§ <br /> 4 350 0.25 53 61 69 85 100§ <br /> 6 350 0.25 26 31 37 47 65 <br /> 8 350 0.25 16 20 25 34 50 <br /> 10 350 0.26 11** 15 19 28 45 <br /> 12 350 0.28 10" 15 19 28 44 <br /> 14 250 0.28 tt 11 ". 15 23 36 <br /> 300 0.30 t 13 17 26 42 <br /> 350 0.31 tt 14 19 27 44 <br /> 16 250 0.30 tt 11` 15 24 34 <br /> 300 0.32 tt 13 17 26 39 <br /> 350 0.34 tt 15 20 28 44 <br /> 18 250 0.31 tt 10 ** 14 22 31 <br /> 300 0.34 tt 13 17 26 36 <br /> 350 0.36 tt 15 19 ! 28. 41 <br /> 20 250 0.33 tt 10 14 22 30 <br /> 300 0.36 tt 13 17 26 35 <br /> 350 0.38 tt 15 19 28 38 <br /> 24 200 0.33 tt 8" 12 17 25 <br /> 250 0.37 tt 11 15 20 29 <br /> 300 0.40 tt 13 17 ' 24 ! 32 <br /> 350 0.43 tt 15 19 28 37 <br /> 30 150 0.34 tt 9 14 22 <br /> 200 0.38 tt 8 * " 12 16 24 <br /> 250 0.42 tt 11 15', 19 27 <br /> 300 0.45 tt 12 16 21 29 <br /> 350 0.49 tt 15 19 25 33 <br /> 36 150 0.38 tt - 9 14 21 <br /> 200 0.42 tt 8 ** 12 15 23 <br /> 250 0.47 tt 10 14 18 25 <br /> 300 0,51 tt 12 16 ' 20 28 <br /> 350 0.56 tt 15 19 24 32 <br /> *To convert inches to millimeters, multiply by 25.4; to convert feet to meters, multiply by <br /> 0.3048; to convert pounds per square inch to kilopascals, multiply by 6.895. <br /> tDuctile -iron pipe is adequate for the rated working pressure indicated for each nominal size <br /> plus a surge allowance of 100 psi (689 kPa). Calculations are based on a 2.0 safety factor times <br /> the sum of working pressure and 100 psi (689 kPa) surge allowance. (See ANSUAWWA C150/ <br /> A21.50 for design formulae.) Ductile -iron pipe for working pressures higher than 350 psi (2413 <br /> kPa) is available. <br /> + +An allowance for a single H -20 truck with 1.5 impact factor is included for all depths of <br /> cover. <br /> §Calculated maximum depth of cover exceeds 100 ft. (30.5 m). <br /> * *Minimum allowable depth of cover is 3 ft. (0.9 m). <br /> ttFor pipe 14 in. (350 mm) and larger, consideration should be given to the use of laying con- <br /> ditions other than Type 1. <br /> 233 <br />