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July August 2015 Marina World

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PUMP-OUT able to run dry

PUMP-OUT able to run dry indefinitely. Pros: Powerful, rugged and self-serviceable. Moderate capacity. Able to run dry. Cons: Unable to handle very high discharge heads. Cost: Low. Peristaltic pump This pump is ideal for high head suction and discharge conditions, as well as heavy demand. Its design makes for simple marina-performed maintenance. Pros: Powerful, with high capacity options. Simple to maintain. Cons: Internal hose is susceptible to failure from sharp objects (rocks, shells, etc.). Unable to run dry for extended periods. Cost: Moderate to high. Rotary lobe pump This design creates high discharge pressures, high volume and handles large solids easily. It offers the pressures and capacities of the larger peristaltic pumps at an often lower cost. The typical rubberised lobes require minimal maintenance. Pros: Rugged and very powerful, with high-capacity. Cons: Limitations in self-priming and suction head. Cost: Moderate to high. Vacuum-tank pump These systems are capable of creating a strong vacuum quickly. They are favoured for ferry docks, customers with large holding tanks, marinas with multihydrant systems, or when the pump must be located far away from the boat. Pros: Quiet and fast pump-outs. Not susceptible to damage from sharp debris. Can run dry indefinitely. Cons: Troubleshooting is difficult. Cost: Moderate to high. Double diaphragm pump. Diaphragm pump. Plumbing essentials A minimum of schedule 80 PVC should be used for all hard plumbing. However, HDPE is preferable due to its flexibility, stronger joints and ability to handle colder climates. All plumbing needs to be well supported. The discharge plumbing should also be level or rising as it leads to the septic tank or sewer to avoid detrimental air locks. A good system has a pump (and branches) that can easily be isolated from the rest of the system. This helps to troubleshoot and quarantine problems, such as air leaks. Ball valves used to accomplish this should only be on the suction side. Check valves are an option on the discharge side. When looking at accessory connections, note that swivels in hose stands and hydrants often create air leaks - it is best to avoid them. For an upgraded arrangement, dry disconnects, not just ball valves, keep docks clean by trapping odour and mess in the hose. Choosing a system The most critical part of selecting a proper system is evaluating a marina’s conditions. Measure the suction head, discharge head and horizontal travel of a system. Share this with vendors to allow for their input on system layout and design: it will result in the most efficient system. Handling the system is another consideration. A non-operator pump-out can occur at any time and is convenient for customers. However, an operator controlled pump is maintained better and put away properly. Most units are designed for self service but are most efficient when dock-hand operated. Pump-out operation Many marinas already have pumpout systems. If a marina has grown or a current system is tired, there are opportunities to better a facility. Before going too far down that path, a marina should ensure its current system is being used properly, as mistakes are common. Here’s a check list: 1. Build up a vacuum before commencing pumping. The pump should be turned on, with the suction valve closed, prior to handing the hose to the boat. Similarly, pump timers that are set too short result in inefficiencies and create unnecessary wear on pumps, as a vacuum needs to be re-established each time it is restarted. 2. The pump-out hose should lay flat when pumping (not vertically coiled). Vertical oscillations create air locks that significantly decrease efficiency. Any horizontal coils or bends in plumbing, including the pumpout hose, also add to decreased performance. Keep hose and plumbing as straight as possible. 3. A pump-out system should be completely flushed with a clean stream of water after it is used repeatedly, or once per day of use. This keeps the pump in serviceable condition and reduces odour that permeates the plumbing. If you recall nothing else, remember that a convenient pump-out system is more frequently used, and this translates directly to cleaner waters and more desirable marinas. Keep up the pumping and expect your customers to keep coming back season after season! Adam Cove is international marketing manager new product development for Edson International of MA, USA. Email: The Platinum2 peristaltic pump manufactured by Edson. Vacuum pump. - July/August 2015 25

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