Pipeline Design, Manufacturing and Installation-BKW, Inc.

(www.bkwinc.com)

BKW, Inc. is a World Leader in Pipeline Technology and Equipment

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Pig Switches

BKW has developed and patented pigging equipment
that advances pigging into the 21^st Century.

BKW manufactures two types of Pig Switches---Non-Sealing and Sealing.


Non-Sealing Switch One into two, manual or remote		Sealing Switch One into two, seals dead side, manual or remote

The Non-sealing Pig Switch will divert a pig into the pipeline requiring pigging without restricting the flow into the pipeline not requiring pigging. This process is used on multiple pipelines sharing one set of pig traps and on pipeline loops.

The Sealing Pig Switch is used when the flow is limited to the line being pigged. This requires the dead line to be sealed from the flow. This process is adaptable in tank farms where the lines are purged of product using air or nitrogen each time a tank is filled or emptied. Bi-directional pigs are required for this process.

Both types of switches will accommodate pigs that will travel through a long radius weld ell (3R). However, steel bodied pigs are not recommended because of possible damage as a result of run away pigs. The Sealing Switch will not switch from one side to the other without a zero pressure drop from the live line to the dead line.

Both types of switches can be automated for remote operation and all switches are customized to the application. This includes in and out configurations such as forks, T's, Y's, and various combinations. In addition vents, drains and pig indicators can be installed on the switch.

BKW Pig Switches Installed in 2008

A 12" ANSI 300 straight run pig switch with a 90° 3D lateral flanged.	A 12" ANSI 600 'Y'	An 8" ANSI 150 stainless steel straight run pig switch with a 90° L. R. lateral flanged.

Click to view larger images.


Typical Use of a Non-Sealing Switch	10" ANSI 300 Sealing Switch under test		3" ANSI 150 Sealing Switch Manual Operator	10" ANSI 300 Sealing Switch with Air Operators