Claims:What is claimed is:
1. A method of backwashing a choked strainer into a contained space and taking it out from that contained space to a location away from the strainer so as to prevent it from getting deposited on the strainer again.
a. An Outer body acting as containment for dislodged floating solids.
b. Supported strainer mesh at the centre space of the body.
c. Back wash water inlet nozzle
d. Back washed fluid outlet nozzle.

2. The method of claim 1 wherein said that the entire system is PLC operated.
3. The method of claim 1 further comprising of two different levels of oil suction valves for different conditions to the said invented strainer (Experto Flush).
4. The method of claim 3 further comprise that the valves which are operated are gas operated controlled valve.
5. There are different inlet and outlet provided for the backwash water inlet and outlet for cleaning the said invented strainer.
6. The method of claim 1 wherein said that the solid particles and impurities which are removed from the sump caisson by means of external means without hindering the normal operations are taken out of the sump caisson.
7. The method of claim 3 further says that the backwash inlet and outlet streams of said invented strainer are manually operated.
8. The newly invented strainer also does not consist of any non-returnable valve (NRV) for preventing the back flow of the oil from blow case. Hence it can work efficiently without NRV.
9. It is also claimed that if any oil particles gets back to the newly invented strainer it gets removed along with the back wash outlet process without choking the mesh of strainer.
10. It is also recommended that the said invented strainer can be used to any type of separating equipment in unit operations which are used to remove floating solid particles from the oil and other medium.
, Description:Normally the equipment for initially treating the production from a well will include primarily a separator of some form capable of separating crude oil from the water and gas which normally flow from the well.
A caisson (Refer to fig 1.) or elongated pile is vertically positioned on, and adjacent to the offshore structure. Said caisson receives in its upper end the flow of used and treated water which results from the producing operation. This untreated water is deposited into the caisson upper end from a discharge pipe. The caisson or pile comprises in essence an elongated member such as a cylindrical steel tube having the lower end open and the side walls maintained water tight, with an upper closure vented to the atmosphere.
The caisson lower end is positioned above the floor of the ocean to permit free egress of water which gravitates downwardly. The lighter than water residue which rises to the caisson upper end is periodically removed through conduit, to be further treated or disposed of.
As the oil coalesces and separates from the wastewater, the oil floats to the surface due to the difference in the specific gravity between the oil and the water. A blow case is provided at upper end of the caisson.
The newly invented strainer (Refer to fig 2) is generally placed towards the down side of the sump caisson. Oil from sump caisson is flown through the different valve arrangement in the sump caisson inside the said strainer and the clear oil is removed from the strainer and passed through the blow case as shown in fig 2. The solid particles and other dust particles in the oil stream gets accumulated on the outer surface of the strainer mesh due to which the strainer gets chocked which requires frequent cleaning of the strainer. Therefore a arrangement is provided to clean the strainer which is termed as backwash inlet and backwash outlet to remove the accumulated solid particles. Therefore high pressure jet is applied at the backwash inlet due to which the solid particles gets disengaged from the outer surface of the strainer and starts floating on the upper surface and later on it is taken out from the strainer and from the sump caisson thus preventing the strainer from getting choked again.