US 9,810,365 B2
Variable speed pipeline pig with internal flow cavity
Mohamed Ahmed A. Soliman, Ras Tanura (SA)
Assigned to SAUDI ARABIAN OIL COMPANY, (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on Feb. 24, 2014, as Appl. No. 14/187,467.
Prior Publication US 2015/0240985 A1, Aug. 27, 2015
Int. Cl. F16L 55/10 (2006.01); F16L 55/38 (2006.01); B08B 9/055 (2006.01); F16L 101/12 (2006.01); F16L 101/30 (2006.01)
CPC F16L 55/38 (2013.01) [B08B 9/0551 (2013.01); B08B 9/0553 (2013.01); F16L 2101/12 (2013.01); F16L 2101/30 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A pipeline pig, comprising:
a housing defining a trailing end, a leading end and longitudinal axis extending therebetween;
a bypass channel extending longitudinally through the housing between the trailing end and the leading end thereof;
a bypass valve disposed within the bypass channel, wherein the bypass valve is operable to maintain a restrictive configuration in which a pipeline fluid is prohibited from flowing through the bypass channel when a differential pressure established in the pipeline fluid between the trailing end and the leading end of the housing is below a pre-selected minimum bypass pressure, and wherein the bypass valve is operable to move to a bypass configuration in which the pipeline fluid is permitted to flow through the bypass channel in response to the differential pressure reaching the pre-selected minimum bypass pressure;
at least one relief channel extending longitudinally through the housing between the trailing end and the leading end thereof; and
at least one relief valve disposed within the at least one relief channel, the at least one relief valve operable to move from a first closed configuration to an open configuration in response to the differential pressure reaching a pre-selected minimum relief pressure and operable to move from the open configuration to a second closed configuration in response to the differential pressure reaching a pre-selected maximum relief pressure, wherein the at least one relief valve prohibits flow of the pipeline fluid through the at least one relief channel when in the first and second closed configurations and permits flow of the pipeline fluid through the at least one relief channel when in the open configuration, and wherein the pre-selected minimum bypass pressure is greater than the pre-selected maximum relief pressure, and the pre-selected maximum relief pressure is greater than the pre-selected minimum relief pressure.