If the pump lost its prime the process had to be repeated because too much air got into the system before pumping commenced. If the timing was right, the pump primed and kept pumping. Apply the hoist brake and catch the ladder before it bangs the bottom. Start the pump at the split second the suction hits the water. When water flowed out of the suction inlet and vent valve it was time to pump. The procedure was simple- raise the suction until the inlet was higher than the top of the pump shell, open a vent valve on top of the pump shell and pump the system full of water. This was the favorite method in the day of the friction winch with its free-fall feature. Properly piped a portion of service water flow can (and should) be fed to the packing gland and the balance directed into the eductor. The eductor is ideal for priming a dredge pump. If the leak(s) is too large the rate of air leaking in will come to match the rate of air removal and complete evacuation will not be accomplished.Īn eductor is a 3-port, no moving parts device that utilizes the venturi principle to pull a vacuum on one port whenever service water is run into and exhausted out of the other two ports. Any air leak in the pump/piping above water will increase the time taken by the eductor to evacuate all the air. If the eductor is connected to the highest point in the system, it will be possible to remove all of the air. The goal is to use the eductor to pull a vacuum on the pump shell and cause water to enter and completely fill the pump shell. Seal the suction pipe by lowering it into the water.Ĭonnect the suction port of an eductor to a port in the top of the pump shell or in the discharge pipe if the pump is a top discharge model. The discharge line can be sealed using a flap valve or a pinch-to-prime device, filling it with water or by immersing a portion of it near the point where it leaves the dredge hull. Seal the discharge line at some point near the pump. Here are a few ways to expel air from your dredge pump/suncton line. There may be quite a few causes but the most common reason why your dredge pump wont pick is simply AIR! Air actually prevents your dredge pump from priming. Often, dredge masters/engineers have experience this before a situation where you tried severally but your dredge pump wont just pick water/slurry.
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