Patent ID: 9296025
Filing Date: 2016-03-29
CPC Classification: B08B,F16L,Y10T

Claim Text:
1. A four pass pig pumping unit, comprising: a trailer having an engine and pump compartment; one or more clean water tanks on the trailer; one or more dirty water tanks on the trailer; a first engine connected to drive a first pump and to drive a second pump, each of the first engine, the first pump and the second pump lying in the engine and pump compartment; the first pump having at least a first inlet and a first power outlet, the first inlet being connected to receive water from at least one of the one or more clean water tanks; the second pump having at least a second inlet and a second power outlet, the second inlet being connected to receive water from at least one of the one or more clean water tanks; a first valved pumping circuit connected to receive pig drive fluid from the first power outlet and including a first return conduit connected to return pig drive fluid to at least one of the one or more dirty water tanks, the first valved pumping circuit having connections for connecting a first pipe to be cleaned into the first valved pumping circuit; a second valved pumping circuit connected to receive pig drive fluid from the second power outlet and including a second return conduit connected to return pig drive fluid to at least one of the one or more dirty water tanks, the second valved pumping circuit having connections for connecting a second pipe to be cleaned into the second valved pumping circuit; a first variable flow control element on the first valved pumping circuit; a second variable flow control element on the second valved pumping circuit; a second engine connected to drive a third pump and to drive a fourth pump, the second engine, the third pump and the fourth pump lying in the engine and pump compartment; the third pump having at least a third inlet and a third power outlet, the third inlet being connected to receive water from at least one of the one or more clean water tanks; the fourth pump having at least a fourth inlet and a fourth power outlet, the fourth inlet being connected to receive water from at least one of the one or more clean water tanks; a third valved pumping circuit connected to receive pig drive fluid from the third power outlet and including a third return conduit connected to return pig drive fluid to at least one of the one or more dirty water tanks, the third valved pumping circuit having connections for connecting a third pipe to be cleaned into the third valved pumping circuit; a fourth valved pumping circuit connected to receive pig drive fluid from the fourth power outlet and including a fourth return conduit connected to return pig drive fluid to at least one of the one or more dirty water tanks, the fourth valved pumping circuit having connections for connecting a fourth pipe to be cleaned into the fourth valved pumping circuit; a third variable flow control element on the third valved pumping circuit; and a fourth variable flow control element on the fourth valved pumping circuit, wherein first pump, second pump, third pump and fourth pump are located on one trailer.