The reduction in pressure in the dredge suction pipe is measured by extending a small tube from a tap in the suction pipe near the pump inlet port to a vacuum gauge located on the operator’s console. As long as air is not permitted to enter the suction pipe, the pump will reduce the pressure in its inlet to the extent necessary to cause sufficient water to flow into its suction inlet to satisfy its capacity to discharge it out of its discharge port. We construct a dredge by connecting one end of an airtight suction pipe to the pump inlet and immersing the other end of the pipe beneath the surface of water. On a hullpump dredge, the running dredge pump (an enclosed space) reduces the pressure in its inlet port in an effort to cause liquid to flow into the impeller eye. What is vacuum? The technical explanation is that vacuum is the pressure in any enclosed space on earth that is less than atmospheric pressure. There is no other way to determine what is going on in the dredge suction pipe. Vacuum gauges are an absolute necessity on sand and gravel hydraulic dredges.
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