SECTION FIVE - TANKS Foundations p 220 Succeeding Rings p 225,226 Centerlines p 220 Horizontal Seams p 226 Laying Floor Plates p 220-222 Barrel Roll p 227 First Ring Layout p 222 Rim Angle p 227,228 Shell Plates p 222 Roof Framework p 228-230 First Ring Erection p 224 Layout Roof p 230 Shell to Floor Welding p 225 Types of Joints p 231,232 Tank Leveling p 225 Scaffold Safety p 233-237