purchased online at the popular website test the suspension mounting time, due to McMaster-Carr, where in the event a nozzle limited resources. or bushing becomes damaged, the part can Although it is conceivable that the spray rack be replaced within a couple of business days be setup and mounted onto roof-suspended at minimum cost. applications by a single worker, the new Figure 12: Rubber caps and brass nozzles and bushings were used in design was intended to be operated by two the final design, which require little maintenance, and are easily workers; which is also required for Morrison replaceable. Hershfield’s current spray rack. This is due to the increased degree and quantity of risk inherent to suspending a spray device of this size from a large building. Two workers can The setup and operation constraints of the ensure more stability and accuracy in PDS were satisfied, maintaining or improving suspending this device, and can monitor each upon the current spray rack used by Morrison other as well to ensure there are no crucial Hershfield. As mentioned previously, oversights that may result in injury or even assembling the rack can be routinely death of people below. performed in about 5 minutes by one worker. The simplicity of operating the rack is The ground level stand is a single telescoping maintained, where only the internal pressure tube, which can be controlled by one person. of the system needs to be monitored. The Once assembled, the rack (without water) coverage area and expandability however are weighs 24.3 lbs, which is far below the PDS improved. The current design used by the constraint of 50lbs, allowing one person, project sponsor has a relatively small, fixed instead of two for the current spray rack, to coverage area. With the new design, the setup and mount the spray rack at ground spray rack has a larger coverage area, which level applications. can also be expanded if necessary. The total setup of the rack or mounting of the rack to the installation at ground level takes CONCLUSION no more than 15 minutes, which satisfies the The team has designed, fabricated, and PDS requirement. The team was unable to tested a water penetration testing device that
purchased online at the popular website McMaster-Carr, where in the event a nozzle or bushing becomes damaged, the part can be replaced within a couple of business days at minimum cost. Figure 12: Rubber caps and brass nozzles and bushings were used in the final design, which require little maintenance, and are easily replaceable. The setup and operation constraints of the PDS were satisfied, maintaining or improving upon the current spray rack used by Morrison Hershfield. As mentioned previously, assembling the rack can be routinely performed in about 5 minutes by one worker. The ground level stand is a single telescoping tube, which can be controlled by one person. Once assembled, the rack (without water) weighs 24.3 lbs, which is far below the PDS constraint of 50lbs, allowing one person, instead of two for the current spray rack, to setup and mount the spray rack at ground level applications. The total setup of the rack or mounting of the rack to the installation at ground level takes no more than 15 minutes, which satisfies the PDS requirement. The team was unable to test the suspension mounting time, due to limited resources. Although it is conceivable that the spray rack be setup and mounted onto roof-suspended applications by a single worker, the new design was intended to be operated by two workers; which is also required for Morrison Hershfield’s current spray rack. This is due to the increased degree and quantity of risk inherent to suspending a spray device of this size from a large building. Two workers can ensure more stability and accuracy in suspending this device, and can monitor each other as well to ensure there are no crucial oversights that may result in injury or even death of people below. The simplicity of operating the rack is maintained, where only the internal pressure of the system needs to be monitored. The coverage area and expandability however are improved. The current design used by the project sponsor has a relatively small, fixed coverage area. With the new design, the spray rack has a larger coverage area, which can also be expanded if necessary. CONCLUSION The team has designed, fabricated, and tested a water penetration testing device that
Rain%20Rack%20-%20Final%20Report.docx