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By certification 
1. Materials: Grade 1, 2, 5, 6, 7, 9, 12, 23.
2. Specification: ASTM B861, ASTM B338,
3. Size:
3.1 Heat Exchanger Tubes:
- OD: 9mm up to 60.3mm,
- WT: up to 3mm,
- Length: up to 14 meters.
3.2 Common Tubes:
- OD: 1” to 13.0” (25.4mm to 330mm),
- WT: Min 0.02” (0.5mm).
2. Specification: ASTM B861, ASTM B338,
3. Size:
3.1 Heat Exchanger Tubes:
- OD: 9mm up to 60.3mm,
- WT: up to 3mm,
- Length: up to 14 meters.
3.2 Common Tubes:
- OD: 1” to 13.0” (25.4mm to 330mm),
- WT: Min 0.02” (0.5mm).
