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TAaLE OF RESTrtAINED OR TIED PIPE REQUIREp gN 300-1� <br />EACH' SIDE OF THE BE'AID <br />Note: (1) Table based nn sand excavation for s�lt increase <br />i2) If polyethylene �araPP�ng is used 5�� <br />, inarease value by 100� <br />NR � Not R�Qommen.i�d . <br />4' Cover <br />Bend Sizes by Degrees <br />Pipe <br />Sixe 22.5 45 67a� 90 <br />3" <br />4fl <br />6" <br />8" <br />12" <br />16n <br />20^ <br />2�n <br />30" <br />36n <br />y2rn <br />46TM <br />NR NR <br />NR NR <br />NR NR <br />NR NR <br />tJR NR <br />?�R NR <br />12� 22� <br />14� 25� <br />17' 30 t <br />1g� �5� <br />22� 39' <br />24� 4�► <br />NR �►� <br />N� NR <br />NR NR <br />NR I�R <br />NR NR <br />Nft NR <br />30� 37' <br />37' 43� <br />45' S2� <br />5ot 61� <br />56� 6gt <br />63+ ?7� <br />6 � Cov�ar <br />Bend Siz�� by Degrees <br />22.5 �5 67.5 90 <br />1� 3� <br />2r 1}� <br />�' 6� <br />4� 7� <br />b' 10 T <br />7' 13 t <br />9' 15� <br />10� 18� <br />12� 21� <br />1 �1 � 25 T <br />16� 28� <br />18' 31' <br />4� 80 <br />5� 13� <br />�' 9' <br />9' 11� <br />'1�' (?r <br />1��� 21 r <br />22t 27� <br />26� 30� <br />30� 37' <br />35 ° J�3 r <br />40� 49� <br />45� 55t <br />8' �over <br />Bend Sizes by Degrees <br />22, 5 u5 67. 5 90 <br />1' �� �r <br />1� 3� u� <br />�� 1�s 5t <br />3' S� 7� <br />S� 8' 10' <br />6' 10� ��tP <br />7' 12� 17� <br />NR NR NR <br />NR '.�R NR <br />NR PrR NR <br />NR NR NR <br />NR NR t!R <br />k' <br />J , <br />6t <br />9' <br />12+ <br />17� <br />20� <br />NR <br />NR <br />NR <br />td R <br />P7R <br />The table was determined from ihe folloMing fnrmula pri;�ted i <br />issue of "Cast Iron pipe HeWsn published by the Cast Iron n�sear�� 1q�5 fal,l <br />ch Association, <br />L (re�tra�ned length) = Sf PA <br />KFs ; Dpp <br />Sf = Sa�'ety factor ( � . 2g � <br />P= Max. Pregsure (�50 D= Conduit ou�side diameter (f�.) <br />A= Pipe Cross-sectian areae��n, g Pp = Passive soil <br />q°) � = 4 tan frictiPneanule (p��'�•) <br />Fs - Conduit frictional resistance <br />neRlecting be11 resigtance 2 <br />(p.l.f.) <br />300.-14 <br />