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<br />~ <br />~ <br />~ <br />N <br />o <br /> <br /> <br />CONTENTS <br /> <br />xm <br /> <br />CHAPTER VII-FABRICATION OF PORTABLE <br />PIPE SECTIONS <br /> <br />INTRODUCTION <br />Section Pagt <br />116. Summary ______hn___n_n_ ____n______ _________hn___ 189 <br /> <br />FABRICATING PLANT <br /> <br />117. General descriptioD_ _ _ _ n____ _ _______n______ _~______ .___._____ 191 <br />118. Genera.! plan and layout of shop______nnn_n__nu___nn_ 195 <br /> <br />FABRICATING SHOP EQUIPMENT <br /> <br />119. General descriptioD___nnnu__n____n__n__n_______________ 198 <br />120. Oranes_________________________________________________----- 198 <br />121. Planer_________________________________________________------ 199 <br />122. Twin hydraulic press______n__nn____n__hn__nn_nnn_h 199 <br />123. Vertical bending roILn_____n_nn_nn_n_h__n_n____n___ 201 <br />124. Assembly jigs and formsuu_n_n___n___n___n____hu_n___ 203 <br />125. Welding machines_n__________________________________________ 205 <br />126. J{-rayequipDlent________________________________________----- 206 <br />127. Stress-relieving furnace__ _ __ ___ _______ __ _______ ___ ______ -- ----- 207 <br />128. Boring milL__nn_ __ n nn_ __n_ n_n__n_ nnh __ nn n __ __ _ 208 <br />129. Drilling machineu__nn_ ______ n n____ nn n___n_ n n____ n_ 209 <br />130. Portable boring milLnn______nnn___nnn___n_n_nhn__ 209 <br />131. Outting machines_nun_nn_____n n_ _____on nn__ u_nn n 210 <br />132. Centerless grinder__n______________n______________ -- -- u__n_ 212 <br /> <br />FABRICATING SHOP OPERATIONS <br /> <br />133. Dimensions and weight of steel plates______n_n_____n_____uu 212 <br />134. Fabrication of pipe sections________n_n____n________n___,__.._ 213 <br />135. Stiffener rings and support brackets_______~_____________h___n_ 215 <br />136. Fabrication of bends and fittings____n__________________________ 219 <br />137. Penstock and outlet-pipe flange~_ __ __ __ h____ __ _ _ __ _ _ __ _ _ _ _ __ __ _ 224 <br />138. Welding requirements_ _ _________ _ _________ __ ___ __ _ _ _ _ __ _._ __ _ n 226 <br />139. Qualifications of welders__________n____________n__n_______n 228 <br />140. Welding procedure and details___nn____nnn__nnn__ __nn_ 228 <br />141. Weld tests_ _ _nn_n__u_nn_n__ _nn_n____ nnn __ nnn_ 230 <br />142. Radiographic inspection_ _ _ _ __________ ________ _________ ___ __ __ _ 231 <br />143. Physical tests of welds__n______n_u__nn__nnnn_____nn_ 233 <br />144. Heat treatment for stress relieving_ ______ ___ nn_ __ ___ _ __ _______ 233 <br />145. Stress-relieving furnace operation deta.ils__n_nn______n________ 235 <br />146. Machining and drilling_u___n___h___n_Unnn___nnnn___ 236 <br />147. Shot blasting and paintingn_____nn__nn__nn_nn_______n 237 <br />148. Storage and loading of sections _ _ _ __ __ _ n __ __ _ __ n _ __ _ _ _ _ __ _ _ n _ 237 <br /> <br />FRACTURES AND THEIR REPAIR <br /> <br />149. Fracture in section UN-9_______________n_______n___nn___h 238 <br />150. Method of repairnunnhn______nn:un______n_.nn_____ 239 <br />151. Fractures in section LN-3L_n___________________n_n_________ 241 <br />152. Fractures in bend section of 3Q...foot pipe__ _ _ _ __ __ __ __ _ n __ _ _ __ _ _ _ 242 <br />153. Residual stresses in section LN-35______n_______n____n_____n 243 <br />