F-A. Chen et aL/ Engineering Failure Analysis 37(2014)29-41 Fig. 6. Schematic diagram of the cross section of a tube. a Fig. 7. Appearance of defect on the outer wall of titanium tube 1B134027-1 (a)o(b)90(c)180(d)270%. hat this phenomenon was because the support plates were vertical, the corrosion products deposited and sagged into the internal borings by the action of gravity 3. Failure analysis of defective tubes early all the failure tubes are located at the periphery of the lower part of the heat transfer tube tower. So they must from the ones in the current Part L, and they will be separately discussed in Part ll [13] of the failure analyer te different share some common problems. However, there are a few exceptions whose failure mode and location are q To describe defect distribution and location on the tubes, we drew a schematic diagram for illustration As shown in Fig. 6 the top of the tube is defined as o and the bottom is 180. Clockwise rotation goes from 0 to 180 and counterclockwise rotation from 0 to-180. The arrow direction perpendicular into the paper represents the flowing direction of sea water side the tube. The numbering of the tubes is based on their locations in the condenser, which is provided by the plant.that this phenomenon was because the support plates were vertical, the corrosion products deposited and sagged into the internal borings by the action of gravity. 3. Failure analysis of defective tubes Nearly all the failure tubes are located at the periphery of the lower part of the heat transfer tube tower. So they must share some common problems. However, there are a few exceptions whose failure mode and location are quite different from the ones in the current Part I, and they will be separately discussed in Part II [13] of the failure analysis. To describe defect distribution and location on the tubes, we drew a schematic diagram for illustration. As shown in Fig. 6 the top of the tube is defined as 0, and the bottom is 180. Clockwise rotation goes from 0 to 180 and counterclockwise rotation from 0 to 180. The arrow direction perpendicular into the paper represents the flowing direction of sea water inside the tube. The numbering of the tubes is based on their locations in the condenser, which is provided by the plant. Fig. 6. Schematic diagram of the cross section of a tube. Fig. 7. Appearance of defect on the outer wall of titanium tube 1B134027-1 (a) 0 (b) 90 (c) 180 (d) 270. F.-J. Chen et al. / Engineering Failure Analysis 37 (2014) 29–41 33