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HFW sprial SERRATED finned tubes apply in boilers, economizers
Base tube material: SA312 TP316 OD114.3mm X13.5mm THK X16000mm LG
Fin Material: 18Cr8Ni THICKNESS 1.5mm, HEIGHT12.7mm, 118FPM,
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
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.
| Name |
Base tube |
Fin Pitch |
length |
|||
| Min | Max | Min | Max | Min | Max | |
| Extruded aluminum finned tube | 12.7 | 51 | 2.1 | 10 | 0.5 | 20 |
| L/LL/KL aluminum finned tube | 19 | 51 | 2.1 | 3.2 | 0.5 | 15 |
| Embedded aluminum finned tube | 19 | 42 | 2.3 | 3.2 | 0.5 | 15 |
| Low finned 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) |
Serrated depth(mm) |
|||||
| 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) |
Thickness(mm) |
Width(mm) |
|||
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&Inspection Deatails:
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
