The proposed tube mill is a combination of equipment installed in a line for the production of High Frequency Induction Welded (HFIW) carbon steel tubes. The process involved is cold forming of carbon steel strip in circular shapes, longitudinal welding, sizing, converting into specified shape and cutting to pre determined length.
Coil skid and coil Car→ Uncoiler with Peeler and hold down roll→ Seven roll Flattener→ Semi Auto shear and end welder→ Spiral accumulator→ Edge Planing Machine→ Forming section (FF) → High-frequency induction welding→ Removing External and internal burr→ Polishing Roller→ Online U.T. tester→ Seam annealing→ drawing →Air Cooling→ Water Cooling→ Sizing→ Milling Saw→ Pullout roller table(water washing) → Straightener→ Pipe End and chamfering machine→ Hydrostatic tester→ U.T. Testing off line→ Weighing and Measuring→ Painting and Marking→ Packing→ Warehousing
Production Range
| Type of production | Round Tubes |
| Round Tube OD | Min 152mm, Max 426mm |
| Tube Thickness | Min 4.0mm, Max 14.0mm |
| Tube Cut Length | Min 8meter, Max 18meter |
| Tube Standard | API 5L X42 – X80, J55/ ASTM A53, A513 |
▪ Product Tolerances
| Outside Diameter Tolerance | As per any relevant international standard |
| Cut Length Tolerance | +-3mm |
▪ Line Specification
| Line speed | Max 24m/min |
| Direction of Operation
(To be confirmed by buyer) |
Left → Right
or Left → Right |
| Threading speed | 10m/min |
| Welding Method | High Frequency Induction Welding |
| Recommended HF Induction welder | Solid state Type |
▪Required Utilities and working Conditions (Buyer’s Responsibility)
| Electricity Supply Main | AC 415Volts ±10%, 50Hz±1%,3Phase |
| Electricity Supply Control | AC 220Volts ±10%, 50Hz±1%,1Phase |
| Cooling Water Supply | Industrial Water, Temperature below 30°C |
| Ambient Temperature | -10 to 40℃ |
| Humidity | Max 90% |
| Air Conditioning | Separate Room required for control Panels |
| Hydraulic Pressure | Min. 70, Max 100kg/cm2 |
| Pneumatic Pressure | Min. 5, Max 7kg/cm2 |
| Pressure | 2kg/cm2 |
