Patent Number: 
Section: claims

1. A strainer system, comprising:an open strainer module and a pressure activated strainer module fluidly connected to each other by a plenum duct;a suction pump fluidly coupled to the plenum duct; andat least one deformable membrane disposed within the plenum duct;the deformable membrane being selectively and deformably transitionable from a closed position wherein the deformable membrane extends across the plenum duct to prevent fluid from being drawn by the suction pump into the plenum duct through the pressure activated strainer module, to an open position wherein the deformable membrane is moved so as to allow fluid to be drawn by the suction pump into the plenum duct through both the open strainer module and the pressure activated strainer module. 2. The strainer system of claim 1 wherein the membrane is fabricated from an elastic material adapted to flex upon the application of a prescribed suction load thereto, and the movement of the membrane from the closed position to the open position is facilitated by the flexion thereof. 3. The strainer system of claim 2 wherein the membrane is fabricated from a non-perforated elastic metal material. 4. The strainer system of claim 2 further comprising:at least one membrane stopper disposed within the plenum duct adjacent the membrane;the membrane stopper being sized and configured to normally engage with the membrane to maintain the membrane in the closed position and to permit the membrane to flex out of engagement with the membrane stopper and toward the open position upon the application of the prescribed suction load thereto. 5. The strainer system of claim 4 wherein the membrane is pivotally connected to the plenum duct at a joint which is disposed in generally opposed relation to the membrane stopper. 6. The strainer system of claim 4 comprising first and second membrane stoppers disposed within the plenum duct adjacent respective ones of opposed sides of the membrane, the first membrane stopper being sized and configured to normally maintain the membrane in the closed position and to permit the membrane to flex to the open position upon the application of the prescribed suction load thereto, and the second membrane stopper being used to prevent the membrane from assuming the open position as a result of a seismic event. 7. The strainer system of claim 1 comprising a plurality of strainer modules arranged in at least two adjacent rows defining multiple opposed pairs which extend in back to back relation to each other with a portion of the plenum duct extending therebetween, the membrane being positioned to fluidly isolate one of the opposed pairs of the strainer modules from the suction pump when in the closed position. 8. A strainer system, comprising:a plurality of strainer modules, including an open strainer module and a pressure activated strainer module fluidly connected to a plenum duct, the plurality of strainer modules arranged in at least two adjacent rows defining multiple opposed pairs which extend in back to back relation to each other with a portion of the plenum duct extending therebetween; andat least one deformable membrane disposed within the plenum duct;the deformable membrane being selectively and deformably transitionable from a closed position to prevent fluid from being drawn into the plenum duct through, to an open position to allow fluid to be drawn into the plenum duct through all of the strainer modules, including both the open strainer module and the pressure activated strainer module, the membrane being positioned to fluidly isolate one of the opposed pairs of the strainer modules from the remaining opposed pairs thereof when in the closed position. 9. The strainer system of claim 8 wherein the membrane is fabricated from an elastic material adapted to flex upon the application of a prescribed suction load thereto, and the movement of the membrane from the closed position to the open position is facilitated by the flexion thereof. 10. The strainer system of claim 9 wherein the membrane is fabricated from a non-perforated elastic metal material. 11. The strainer system of claim 9 further comprising:at least one membrane stopper disposed within the plenum duct adjacent the membrane;the membrane stopper being sized and configured to normally maintain the membrane in the closed position and to permit the membrane to flex to the open position upon the application of the prescribed suction load thereto. 12. The strainer system of claim 11 wherein the membrane is pivotally connected to the plenum duct at a joint which is disposed in generally opposed relation to the membrane stopper. 13. The strainer system of claim 11 comprising first and second membrane stoppers disposed within the plenum duct adjacent respective ones of opposed sides of the membrane, the first membrane stopper being sized and configured to normally maintain the membrane in the closed position and to permit the membrane to flex to the open position upon the application of the prescribed suction load thereto, and the second membrane stopper being used to prevent the membrane from assuming the open position as a result of a seismic event. 14. A strainer system, comprising:a plurality of strainer modules arranged to define multiple opposed pairs which extend in back to back relation to each other, each of the opposed pairs of the strainer modules being fluidly connected to each other by a plenum duct, the plurality of strainer modules including an opposed pair of pressure activated strainer modules;a suction pump fluidly coupled to the plenum duct; andat least one deformable membrane disposed within the plenum duct;the deformable membrane being selectively and deformably transitionable from a closed position to prevent fluid from being drawn by the suction pump into the plenum duct through the opposed pair of pressure activated strainer modules, to an open position to allow fluid to be drawn by the suction pump into the plenum duct through all of the plurality of strainer modules. 15. The strainer system of claim 14 wherein the membrane is fabricated from an elastic material adapted to flex upon the application of a prescribed suction load thereto, and the movement of the membrane from the closed position to the open position is facilitated by the flexion thereof. 16. The strainer system of claim 15 wherein the membrane is fabricated from a non-perforated elastic metal material. 17. The strainer system of claim 15 further comprising:at least one membrane stopper disposed within the plenum duct adjacent the membrane;the membrane stopper being sized and configured to normally maintain the membrane in the closed position and to permit the membrane to flex to the open position upon the application of the prescribed suction load thereto. 18. The strainer system of claim 17 wherein the membrane is pivotally connected to the plenum duct at a joint which is disposed in generally opposed relation to the membrane stopper. 19. The strainer system of claim 17 comprising first and second membrane stoppers disposed within the plenum duct adjacent respective ones of opposed sides of the membrane, the first membrane stopper being sized and configured to normally maintain the membrane in the closed position and to permit the membrane to flex to the open position upon the application of the prescribed suction load thereto, and the second membrane stopper being used to prevent the membrane from assuming the open position as a result of a seismic event.