Roto Lining Of HDPE / PP / PVDF / HALAR / ETFE / PFA
It is a computer controlled lining technology using rotational movement of equipment along with sintering process. This process creates seamless lining with virtually uniform lining thickness from 500 microns to 6mm Roto lining of HDPE, PP, PVDF, HALAR , ETFE , FEP, PFA is available in natural, FDA or Antistatic Conductive fnish.
Lining of equipment that contains chemicals that diffuse through fluoropolymers is a growing application for this lining technique due to benefit of the increased liner thickness.
Typical ideal applications for ROTO LINING include: Centrifuges, Column sections, Vessels, Filter housings, Dryers, Reactors, Mixers, GLR Spares, Heat Exchangers, Pipes & Fittings, Pumps, Blowers, High purity linings for semconductor applications, IBC Containers and other chemical transport containers.
Advantages of Roto Lining
- Better Chemical Resistance as natural Polymer is used and is heated one time, not like repeated heating in Coating so better properties of polymer
- Better bonding of lining to equipment because of centrifugal action of rotating movement & better life as direct bonding to equipment without adhesive.
- Any thickness of lining is possible from 500 microns to 6mm in single heating.
- FAST Delivery as quick completion of lining.
- Mono block type tanks & Receivers without main body ange can be lined.
- Seamless construction without any weld joints.
- Suitable for full vacuum.
- Suitable for heat transfer application.
- Antistatic , conductive , FDA Lining available.
- Minor repair / touch up possible at site.
Roto Lining Technique
Preparation of the object to be lined
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Inspection of the parts to be lined
The parts to be processed are checked before being lined according to the construction guidelines DIN EN 14879-1. The radiuses have to be properly rounded off and welding seams have to be cleanly ground. No welding beads are allowed to remain.
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Thermal degreasing
Before the lining process, greasy or oily residues have to be removed, as these can influence the adhesion of the lining onto the carrier material.
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Preparation of the object and roughing up the surface
In order to achieve adhesion, the parts are first sandblasted with highly purified aluminium oxide.
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Rotational sinter lining
The components are fixed into a clamping device and filled with the appropriate material. The lining temperature and rotational speed are individually set.
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Finishing
Mechanical processing of the sealed surface.
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Inspection and quality control
The components are inspected visually for appearance, layer thickness, pore impermeability and, if necessary, electrical conductivity, and an inspection certificate 3.1 according to DIN EN 10204 is issued. All test procedures are documented.
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Packaging and shipment
COMPARED WITH COATING
- Thicker Lining Possible Upto 6 mm
- Uniform Lining Thickness
- Better Chemical resistance as polymer heated only once above its melting point.
- Economical as less wastage of material
- Longer pipes can be lined from inside
- No over spray on outside surface
- Less Delivery Time
COMPARED WITH SHEET LINING
- No welding line / Seamless surface
- Better Bonding with metal without air gap
- Better operating Temperature up to 200 C
- Heat transfer is possible
- Suitable for full vacuum
- Better purity of product as no adhesive is used
- Higher operating pressure for equipment
- Available Antistatic Conductive Lining with
- Resistance of 10 e 4 to 10 e 8 OHMS
- Less Delivery Time
Applications of Fluoropolymers Roto Lining
| 1. | Lined Centrifuges | Top discharge Centrifuges / Lifting Bag Centrifuges / Bottom Discharge Centrifuges / Peeler Centrifuges |
| 2. | Lined Storage Tanks | Vertical Storage Tank / Horizontal Storage Tank / ML Tank / Dosing Tank / Jacketed Receiver |
| 3. | Lined Filters | ANFD / Nutsche Filter / Basket Filter / Cartridge Filter / Bag Filter |
| 4. | Lined Dryers | VTD Dryer / FD Dryer / RCVD Dryer/ ATFD Dryer |
| 5. | Lined Reactors | For HF / High Alkaline / Abrasive application |
| 6. | Lined Mixers | Nauta / Ribbon Blender / Polygonal Blender / Agitator / Static Mixer |
| 7. | Lined Columns | Distillation Columns / Mist Elliminator / Gas Scrubber / Absorber |
| 8. | Lined GLR Spares | Agitator / Top Dish / Bottom Shell / Manhole Cover / Protection Ring / Flush bottom Valve / Thermowell / NRV |
| 9. | Lined Heat Exchangers | Shell & Tube / U Tube / Double Jacketed / Coil / Plate Type Heat Exchangers |
| 10. | Lined Valves | Diaphragm Valves / Ball Valves / Butter Fly Valves / Flush bottom Valves |
| 11. | Lined Pipes & Fittings | Standard / Jacketed Pipe |
| 12. | Lined Pumps | Centrifugal Pumps / Diaphragm Pumps / Metering Pumps / Magnetic Pumps |
| 13. | Lined Blowers | Impeller Blowers / Casing Blowers |
COMPARISON OF PROPERTIES OF POLYMERS
The important properties to be considered of lining are as follow
| Material | SpecificGravity | MeltingPointC | Max working temprature C | HardnessShore | ChemicalResistance | AbrasionResistance | RawMaterialCost |
| PFA | 2.15 | 305 | 200 | D-64 | Excellent | poor | Expensive |
| FEP | 2.15 | 265 | 180 | D-55 | Excellent | poor | Expensive |
| ETFE | 1.74 | 245 | 120 | D-63-72 | Excellent-1 | Excellent | Moderate |
| ECTFE(Halar) | 1.68 | 221 | 100 | D-75 | Excellent-1 | Excellent | Moderate |
| PVDF | 1.77 | 165 | 80 | D-75-80 | Excellent-2 | Excellent | Moderate |
| PP | 0.942 | 155 | 80 | D-58 | Good 3 | Supreme | Low Cost |
| HDPE | 0.96 | 105 | 60 | D-44 | Good 4 | Good | Lowest Cost |
- Attacked by strong oxidizing agents and hot amines (For ETFE & HALAR)
- Resistant to acids and bases ; dissolved by polar organics (For PVDF)
- Resistant to acids and bases ; attacked by strong oxidizing agents (For PP)
- Resistant to dilute acids and bases; attacked by strong oxidizing agents (For HDPE)
- PFA - Per Fluoro Alkoxy
- PVDF - Poly Vinylidene Fluoride
- FEP - Fluorinated Ethylene Propylene
- PP - Polypropylene
- ETFE - Ethylene Tetra Fluoro Ethylene
- HDPE - High Density Polythylene
- ECTFE - Ethylene Chloro Trifluoro Ethylene