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3 . 2.2.2 Water head L- 10 The water head was made by welding an 18-in. SA-234 steel weld cap to an 18-in. 300-lb SA-105 steel weld neck flange. The 3/8-in. SA-515 Grade 70 steel plates were welded inside the cap to serve as pass parti- tions. A 3-in. 300-lb SA-105 steel weld neck flange with attached SA-53 Grade B steel pipe was used as the connection to the water supply penetra- tion in the side wall of the cap. Four1-1/2-in. SA-53 GradeBsteel pipes connected the final pass plenum to a mixing header fabricated of 4-in. SA-53 Grade B steel pipe with 4-in. SA-234 steel weld caps. The water return connection to the mixing header consisted of a 3-in. 300-lb SA-105 steel weld neck flange with attached SA-53 Grade B steel pipe. Two 1/4-in. 6000-lb steel full couplings, one each installed i n the water sup- ply and water return connections, were employed for ORNL inlet and outlet water temperature measurements. I k o 1/2-in. and three 1-in. 6000-lb steel f u l l couplings were provided a t various points i n the water head assembly for instrument or other use by INEL. A forged steel Crosby No. 5 pad eye was welded to the 18-in. flange edge to facilitate water head assembly operations 2.2.3 Tube bundle The tube bundle was composed of 110 lengths of annealed Admiralty (ASME SB-111) tubing. Of these, 104 were externally fluted (by Grob, Inc.), 1-in.-OD, 16 BWG tubes with type E profiles (Figs. 3 and 4) intended t o be the primary heat transfer surfaces. The remaining 6 positions, a l l on one side of the bundle, contained smooth, 1-in.-OD, 18 BWG tubes t o serve as downcomers to channel condensate from the six upper baffles to the liquid sump area in the bottom section of the shell. The tube arrangement was triangular pitch on 1-1/4-in. centers. Seven baffles fabricated from 3/8-in. SA-515 Grade 70 steel plate were arranged along the bundle length t o guide the working-fluid vapor flow on its shell-side passes. The top six of these had 118-h. tapered steel edge strips to direct condensate flow to their respective downcomers and prevent condensate overflow to the sections below. Five tube support plates of 3/8-in. SA-515 Grade 70 steel were added along the bundle length to strip condensate from the tubes and reduce the potential for tube vibrations. .PDF Image | Raft River Geothermal Test Site
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