Page 9 - Heat_Exchanger_2020
P. 9

Option 1
                                   With a pre-hole                          Step 3
                                   Drilling procedures for tube sheet     • Drilling through hole
                                   and stacked baffle plates (L/D ≥ 5)    • Holder: SUMOCHAM- 8xD,
                                                                            10xD, 12xD and up
                                   Step 1                                 • Insert: ICP/ICM/ICG/FCP
                                 • Drilling a pre-hole                    • The drill should break through the tube
                                 • Holder: SUMOCHAM- 1.5xD or 3xD           sheet by 2 mm (.08”) before retracting
                                 • Insert: ICP/ICM/ICG/FCP
                                 • Pre-hole depth: 1xD                      Option 2
                                 • In case of clad tube sheet, the pre-     Without a pre-hole
                                  hole should penetrate into the          • Drilling procedures for tube sheet
                                  second material by 1 mm (.04”)
                                                                            and stacked baffle plates (L/D ≥ 5)
                                   Step 2                                 • Drilling through hole
                                 • Penetrating the guide hole             • Holder: SUMOCHAM-
                                                                            5xD, 8xD, 10xD, 12xD and up
                                 • Holder: SUMOCHAM- 8xD,                 • Insert: HCP / QCP
                                  10xD, 12xD and up
                                 • Insert: ICP/ICM/ICG/FCP                • The drill should break through the tube
                                                                            sheet by 2 mm (.08”) before retracting
                                 • Low speed rotation and cutting feed should
                                  be applied while penetrating the guide hole
                                 • Stop axial movement 2 mm (.08”)
                                  above guide hole bottom



















































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