Giant pipeline smart pig - photo

[Frank S]

I remember when paraffin scrubbing pigs were little more than huge rubber balls with bristles embedded in them propelled solely by the flow and pressure of what ever substance was being pumped through the pipeline. they would travel from riser loop to riser loop and be trapped by partially closed valves then retrieved from the bypass section
This monster would have to be inserted torpedo tube style and retrieved in the same way at the other end with the flow making a turn