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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