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250 <br />I <br />+ 8•incli PVC <br />O 6-inch <br />~ 12-inch <br />^ 20•inch <br />~ 200 <br />z <br />a <br />N <br />~ 150 <br />z <br />0 <br />~ 100 <br />0 <br />z <br />50 <br />0 <br />_ + + <br />- o <br />III ~ ~ ~ Q $ o <br />V~1 r <br /> <br />0 5 10 15 20 <br />GROUND VIBRATION, RADIAL, iNs <br />Figure 1.- Longitudina' strain and surface radial vibration <br />250 <br />~ 200 <br />Z_ <br />150 <br />100 <br />a <br />U <br />ci 5 0 <br />0 <br />i <br />O 6-inch,TOP ' <br />^ 20-inch, TOP ~ <br />^ 20-inch, FRONT - <br />i <br />i i <br />i i <br />i ~ i <br />~ ~ i <br />~ ~ ~ <br />i i i <br />i ~ i <br />~ i i <br />~ i i <br />i i ~ <br />i ~ ~ <br />~ i ~ ~ <br />~ ~ ~ ~^ <br />p i ^i i <br />~ ~ ~ <br />8 ~ ~ ~ ~~ ~ ~ <br />^ ~ <br />0 2 4 6 S 1 0 <br />GROUND VIDRATION, V[RTICAL, iNs <br />Figure 8.- Cit~umferential strain and surface vertical vibration <br /> <br /> <br /> <br />147 <br />