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12 ORNL-DWG 84-45255 Fig. 4. Enlarged fluted tube cross section - type E profile. The fluted tubes were fabricated with smooth intervals (see Fig. 3) corre- sponding t o the baffle and support plate locations. During assembly, each tube was light-rolled with a long-reach tube expander into each baffle and support plate. Fifty-two of the fluted tubes had extra long smooth sec- tions a t one end t o form the U-bends required t o connect t o the remaining 52 fluted tubes. After trimming and beveling, the tube pairs were s i l v e t soldered t o complete the connections. Six t i e rods of 3/8-in. steel were spaced near the bundle periphery, threaded t o mate with the tube sheet, and welded t o each baffle and support plate t o further strengthen the bun- dle assembly. The tube sheet was a 2-3/16-in.-thick, 28-in.-diam8 SA-516 Grade 70 steel disk with grooved tube holes for roll-expander sealing. A 13/16-in. hole in the tube sheet served as a vent port leading t o a length of 3/4-in. SA-106 steel pipe with associated 3/4-in. 300-lb SA-105 steel weld neck flange welded t o form the interface required for installation. Twoforged steel CrosbyNo. 5 pad eyes were welded to the periphery of the tube sheet to facilitate tube bundle insertion and removal operations. A 6-in.-diam 1/4-in. perforated steel plate was suspended from two 1/2-in. steel rods between the bottom two support plates to act as a flow deflec- tor opposite the vapor inlet port of the shell when the condenserwasas- esmbled. Shrouds formed from 118-in. steel plate were placed on two sides of the bundle between each consecutive pair of baffle/support plates to minimize vapor bypass around the edges of the tube array. An Elliott l-in. brass tube plug was placed in each of the six downcomer positions i n the tube sheet to prevent leakage between the shell and tube sides. One 1/2- by l-in. drainage slot was made in the downcomer side of each supportPDF Image | Raft River Geothermal Test Site
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