Sorry for the lack of info, ...

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Sorry for the lack of info, the pigging system is required for a sea water pipeline that connects an intake PS to a RO plant, total length will be around 3.7KM. The pipeline will be connected to a reservoir at the RO plant. 

what would be the minimum head and flow velocity in the pipeline needed for launching the pig from the RO plant? 

Any other info. will be apretiated.