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| For convenience of application we have developed several standard
designs of the type F exchanger and have assembled the details in
this catalog.
Vapor Condensers: Reboilers: Heat Exchangers: Model numbers of D & R exchangers can be determined easily by assembling a few pertinent factors. The result will generally describe the unit and simplify identification. Example: This is determined as follows:
1. Model "VS" -- Shell Side condensing (from general catagories
outlined above) Model "VT" Vapor condensers are available for both vertical and horizontal installation. The wide selection of available tube sizes and lengths provide for variety of selection. The economics of alloy construction make them a "must" when considering this type of problem. Example Problem: Our general selection in this instance will be a Model "LL" for the liquid to liquid service specified. The tube pass arrangement has been predetermined (4) as well as the tube size 3/4" O.D. x 16 BWG, tube designation Group 6. From the table of the Dimensional Standards and Surface Areas we find that Model "LL" exchangers four tube passes are detailed on the following pages, including Dimensional data for four pass tube side arrangements, triangular tube pitch, Group 6 tube size in the column entitled D & R Standard Model "LL" for Group 6 (the predetermined tube size), find that under a tube length of 10'0" (the specification calls for a 12'0" maximum overall length) the listed surface area nearest the 140 sq. ft. surface specified has a 10-3/4" shell and provides 142 sq. ft. surface, a satisfactory selection. You now have sufficient information for a complete model designation:
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