This is another method of cement mortar coating outside of M.S. Pipe.This is effective method and the coating cement applied over the pipe will be good strength in service.
The weld mesh wound pipe will be fixed in machine called coating machine or coating Lathe by both end will be mounted two mandrels with proper tightening.
The machine consist ofTwo mandrel one is drive end and another is idle end.These mandrels mounted over the trolley which will move forward and reverse over a pair of rail arrangements.
The drive end mandrel will rotate constant speed and it will rotate pipe after fixing. So the pipe will rotate and move over trolley.
Ahigh speed reversely mounted bunch of steel wire brushes will have attached with two motors.These units also fitted along with the trolley which is moveable.
Now the proper mixture is feed from hopper to in-between the steel wire brush bundle by means of belt conveyer. Now the mixture will receive by brush and due to high speed rotation the mixture will apply the mortar over the surface of the pipe which is rotating in the mandrels.
Now the proper mixture is feed from hopper to in-between the steel wire brush bundle by means of belt conveyer. Now the mixture will receive by brush and due to high speed rotation the mixture will apply the mortar over the surface of the pipe which is rotating in the mandrels.
Based on the thickness 25 mm the rpm and speed has to set to bring the thickness and finishing.And the thickness will be checked by a gauge during it green stage.
Then the surface finishing will be done after applying cement and water mixture by the help of coir brush.
The both ends of the pipe 150 mm will be left to facilitate field welding purpose.
The finished pipe will be removed by the help of lifting belt and suitable crane gently and to be placed in curing yard.
The curing either by manual or sprinkler to be started from the next day of coating and should continue at least 7 days.
The pipe number should have marked in the edge of pipe along with coating date.
The register will be maintained on having details of date and time, mixture proportion, thickness, RPM of coating Lathe status of weld mesh fixing with overlap cover blocks details curing period.
The register should be submitted to concerned Engineer every week and concerned Incharge to end of every month.
After completion of all in lining and outer coating as well as curing the dispatch clearance will be given by site Incharge and dispatch register will be entered.
The cement and sand consumption will be noted and monitored and entered in the register for future reference regularly.
In this method the coating of cement mortar over the pipe will be completed at a time. Whereas manual guniting will take 2 days to complete the coating.
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