HFW sprial fined tubes apply in Economizer for waste heater
recovery boiler
Manufacturing Process:
The fin strip is welded continuously and spirally wound onto a
polished bare tube. And the tube and fins are bonded together by
using high frequency resistance welding technique.
Material: Stainless Steel+Stainless Steel, Carbon Steel+Carbon Steel,
Alloy+Alloy etc.
Bare tube OD: 16-219mm Fin Pitch: 3-25mm Fin Height: 5-30mm Fin Thick: 0.8-3mm
| Name | Base tube (OD) mm | Fin Pitch (mm) | length (m) |
| Min | Max | Min | Max | Min | Max |
| Extruded aluminum fin tube | 12.7 | 51 | 2.1 | 10 | 0.5 | 20 |
| L/LL/KL aluminum fin tube | 19 | 51 | 2.1 | 3.2 | 0.5 | 15 |
| Embedded aluminum fin tube | 19 | 42 | 2.3 | 3.2 | 0.5 | 15 |
| Low fin tube | 12.7 | 32 | 0.8 | 2 | 0.5 | 20 |
| Spiral fin tube | 12.7 | 70 | | | 0.5 | 20 |
| ERW HF spiral fin tube | 16 | 219 | 3 | 25 | 0.5 | 28 |
| ERW HF spiral serrated fin tube | 16 | 219 | 3 | 25 | 0.5 | 28 |
| Serrated width(mm) 10 min~26 max | Serrated depth(mm) 4 min~16 max |
| ERW studded tube | 89 | 200 | 16 | 50 | 2 | 15 |
| | | | | | |
| DC ERW H/HH fin tube | 25 | 51 | 9 | 25 | 1 | 15 |
| H/HH fins | Length(mm) 60 min-150 max | Thickness(mm) 1.5 min~4 max | Width(mm) 30 min~50 max |
Application: The High Frequency Resistance Welded Helical Fin Tubes are widely
applied in fired heaters, heat exchanger, boilers, economizers,
pre-heaters, heat pipes, heaters etc…
Capacity: Seven ERW High Frequency fining lines, daily capacity around 50
tons,length≤28meters;
Products:
Fin pitch
Labeling
Welding
Packaging: sea worthy with plastic cap for each edge of core tube , finned
tubes shall be put on the metal frame with wooden walls and plastic
layer be considered between tubes rows to avoid damage and
deformation of the fins
Description of the inspections carried out
Following documentations should be reviewed & endorsed:
1. Declaration of conformity,
2. Inspection plan,
3. Welding book(WPS & PQR),
4. Finned tubes examination reports
(dimension & visual inspection, hardness test report, tensile test
report),
5. Test samples sheet,
6. Incoming inspection report,
7. Inspection certificate for bare tube,
8. Quality test certificate for steel strip,
9. Iinspection & Guarantee certificate for finned tube,
10. Product inspection report.
Sample
tensile test
