Muna Noor’s state of the art plant in Sohar Industrial area provides an internal coating facility for steel pipe and fabrications of all sort but particularly for the petrochemical industry. Roto-lining is a lining technique that allows a chemically modified polyethylene to form a bond with metals or other resins. Roto-lining enables vessels and pipes of a complex shape and limited access to be lined seamlessly and without difficulty, linings can be made significantly thicker than by other method. The bonded plastic can be used to line metal vessels, pipes, tanks or any other components that require corrosion protection and chemical resistance.
Muna Noor have a specialist team of 30 technicians within the department and can perform roto-lining on objects up to 3 metres in length. The average turnaround of projects can be as fast as two weeks, dependant on the size of the project.
The method for lining involves three distinct stages. The first phase of the process involves shot-blasting the surface of the item to be lined after which the fitting or vessel is mounted to the moulding machine. A calculated quantity of polymer, which is in powder form, is placed in the fitting.
The fabrication is then heated in an oven whilst being rotated on two axis, roto-lining is a tumbling and coating process, there is no centrifugal force of the material. During this time the temperature is accurately monitored and controlled to ensure the molten polymer’s viscosity is such that it never becomes liquid. When the essential temperature profile has been achieved and the polymer evenly coats the inside of the part the fabrication is gradually cooled and the lining is stabilised to minimise stresses in the lining. The process entails no force or shear to the material, roto-lined parts are lined completely seamless and weld free.
The part is then removed from the machine and surfaces such as flange faces and O ring sealing areas are machined into the plastic.
To conclude the procedure, testing of the liner is required to ensure the continuity. Thickness tests are also carried out to ensure the required lining thickness has been achieved. Each part is fully tested to ensure completeness of the lining.
For more information, please visit our Roto-Lining product page or get in touch with your local Muna Noor representative.
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