Info

limitations

number possible

or two passes

limitations^

limitations

limitations^

Internal gaskets eliminated

Yes

Yes

Yes

No

Yes

No

NOTE: Relative costs A and B are not significantly different and interchange for long lengths of tubing. 'Modified from page a-8 of the Patterson-Kelley Co. Manual No. 700A, Heat Exchangers.

fU-tube bundles have been built with tube supports which permit the U-bends to be spread apart and tubes inside of the bundle replaced.

tNormal triangular pitch does not permit mechanical cleaning. With a wide triangular pitch, which is equal to 2 (tube diameter plus cleaning lane)/V3, mechanical cleaning is possible on removable bundles. This wide spacing is infrequently used.

§For odd number of tube side passes, floating head requires packed joint or expansion joint.

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