In general, dewatering operations on a pipeline involve the removal of the test water at the highest possible rate while using backpressure to maintain a full column of water in front of the pig. Milbar is capable of dewatering approximately 2800 gallons per minute when using a single riser manifold. Due to the large volumes of water which are removed from the pipeline, dewater structures must be constructed to prevent the effects of erosion on the surrounding area. Depending on the situation, the dewater structure may be comprised of a:

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• Splash Pup into a dewater pit - Baffled pup placed inside a dewater pit.

• Filter Bag into a dewater pit - Large volume filter bag placed inside a dewater pit for low volume discharge.

• Splash Plate over an existing water body - Splash plate welded to the end of a pipe causing the water to "fan out" over the water body.

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The process of dewatering a pipeline may entail much more than merely removing the test water. Often times the test water will be used for multiple sections along the test spread. This is referred to as "pushing water" and although necessary in some situations it may be cost effective in others. Dewatering from one section to the next might be appropriate if:

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• There is no water available for that section of the pipeline.

• In order to conserve water due to permitting, drought conditions or if the water is being trucked in from another source.

• To prevent large volume contamination if the line is being re-tested and the test water must be disposed of at a government approved disposal facility.

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Milbar is capable of dewatering pipelines quickly and safely under any circumstances, including high head situations. Using our booster, we are able to overcome head pressures of up to 2000 psi. In general, however, the number of compressors needed and their operating pressure will depend on the characteristics of the test section. In any case, Milbar has the experience and equipment to ensure that your pipeline is dewatered successfully and safely.