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Injection or batching of corrosion inhibitor fluid can help reduce pipeline deterioration, but gravity naturally forces inhibitor to settle along the bottom of a pipe, leaving the top of the pipe unsaturated and most vulnerable to corrosion. The TDW V-Jet® Corrosion Inhibitor Pig is designed to defy gravity by spraying corrosion inhibitor onto the inside top portion of multi-phase gas gathering or gas transmission pipelines.
The V-Jet® Pig works based on the dynamics of bypass flow and differential pressure, with no moving parts or pressure vessels to fill and charge. Instead, the V-Jet® Pig’s patented design allows the higher pressure to flow through its body and spray head. Bypass flow acts as the accelerant to transfer and vaporize fluid while creating a low pressure area in the spray nozzle as it passes through. This pressure drop creates a vacuum at the V-Jet® Pig’s front inlet ports, and this vacuum draws up residual corrosion inhibitor that has settled on the bottom of the pipe.
The reclaimed corrosion inhibitor is then redeployed by the nozzles as an atomized spray at about a 45-degree angle (10-inch and larger) onto the top half of the pipe’s inner wall. The atomized spray also creates an increasingly dense vapor cloud that is pushed ahead of the V-Jet® Pig during the entirety of the run, helping to coat all areas of the pipe wall with inhibitor.