|
<br />- -
<br />
<br />, ~~
<br />
<br />, 1''': ",' ';;', " TASLE OF'RESTRAINED'..ORI'1'-IBD',PIPE REQUIRE]) ON EACH: SIDE OF THE-BEND
<br />I' . . .. "
<br />;J . r, > . ' " = >, - ~
<br />
<br />Note: (1) 'l'abl'e', based' 'dn sana -excl!I.va.tio'n for, silt. 'increase '50%
<br />(~) If poly~thyl~ne wrapping -is 1,(seci, increase' value !?Y 100_% '
<br />
<br /> HR- Not, Recommended
<br /> 4' Cover 6" Covext
<br /> [
<br /> L
<br /> Bend sizes by-Degrees Bend Sizes by qeqrees
<br />Pipe -,
<br />Size 22.5 45 ~7.S 90 22.5 4,5 . 67;;5 90'
<br /> -
<br />3" NR NR NR NR l' 3' .{, 8'
<br />4" NR 'NR 'NR - NR 2' 4' - 5' 13'
<br />"
<br />6" NR -N!{ NR NR 3' , 6i- 8'- 9'
<br />e" -NR NR NR, HR- .4' 7' 9' 11'
<br />12" NR, NR' NR NR 6' 10" 14' 17'
<br />16" NR NR NR NR 7' 13' 18; - 21'
<br /> ,
<br />20" 12' 22' . 30' .,' 37'" 9' 15' 22' 27'
<br />.24" 14,', ,~5' . 37' ..j,' ....3', '10' 18' 26' )0'-
<br /> _ ~ ~~ -f;,,!. ~ ~L.
<br /> , . 52' :';",
<br />30" 17' 30' :4,5' " 12' 21' 3Q' 37-1-
<br />36" 19' 35' 50' - 6,1' 14' 25'- 35' _43'
<br /> ,;
<br /> .
<br />42" 22" 39' '56' 69' 16' 28.' 4Q' 49'
<br /> -
<br /> it '
<br />48" 24' 43' 63' 77' 18' 31' 4~' '55'
<br /> -;
<br />
<br />8' Cover
<br />
<br />300-14
<br />
<br />'J::
<br />\,' '
<br />rl
<br />J '
<br />I~
<br />.~...
<br />{,
<br />
<br />~nd ~izes by Degrees )1'
<br />2.2.5 45 67.5 - 90 ,\,
<br />
<br />
<br />l' '2' 3'4'1"
<br />
<br />5'1:'.--
<br />6' \.
<br />
<br />9' \1
<br />
<br />5' ,8' 10" '11-72,-' [:', '
<br />6' 10' -14'
<br />
<br />7' 12'. 17'" .2 ~' r~" -
<br />1m - 1m, NR Hal,'
<br />NR ;,)iR NRNR !t
<br />
<br />HR. NR' 1m NR ~
<br />NR NR NRNR it
<br />
<br />NR- (Ii
<br />
<br />1 -. I .
<br />
<br />
<br />
<br />il~
<br />f ",:-
<br />I '
<br />'J,I
<br />' L-
<br />\1
<br />\ -
<br />'/.1
<br />
<br />l'
<br />
<br />3',
<br />
<br />'4' '
<br />
<br />2'
<br />
<br />4'
<br />
<br />5'
<br />
<br />, 3'
<br />
<br />5'
<br />
<br />7' -
<br />
<br />HR'
<br />
<br />1m
<br />
<br />-1m
<br />
<br />- - ~ - -
<br />The table -~was detertQined ,from the follQwinq j~formulELPrii1ted in the -1975-
<br />fa11issue of "Cast. Iron .Pipe Hews"p~li'sh,c1 :by ,the Cast:'Irc>n' Rlasearch
<br />Association.
<br />
<br />..~
<br />
<br />L (r~~~~~inect len~) 1 :~~t . DPP
<br />
<br />"
<br />
<br />"Sf' - ';safetyfacitor (1 ~25)
<br />P - Max. Pressure (~50,p~s.e.)
<br />A . Pipe-cJ;oss-seot~on ~rea (in. sq.)"
<br />Fs .,Conduit 'fri9tio~alresistance .
<br />, neglecting })ell)res~sta_nce (p.-l. f.)
<br />D ~ - Conduit out,dde'Jc1iameter (ft.) .
<br />- Pp _ -, pass'ive so~l pr_ssure- (p. s. f.)
<br />K =:4 tan (f~i9tion~~~91~) ,
<br />2 ~
<br />
<br />~.oo- ~- "0-0;<____
<br />
<br />-c
<br />
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