How To Replace Bilge Pump – The world’s best bilge pump won’t keep your boat dry if it’s not properly installed and maintained. While installing a bilge pump is fairly easy—and definitely in the realm of DIY projects—there are a number of factors (capacity, line size, pipe diameter, fuse size) to consider before you get started, and a few good rules to follow.
The first step is to select the right bilge pump(s) for the job. We recommend the installation of two electric centrifugal pumps (preferably with an automatic water level sensor): a smaller pump installed in the belly of the bilge to handle any bilge water (rain, stuffing box drips, etc.) with minimal power, and another pump. a few inches higher to handle larger jobs. There are several reasons for this; the most important thing is that in case of a pump failure, there is always a backup.
How To Replace Bilge Pump
Capacity: For most mid-sized boats (30-35 feet long), wed recommends a 1000-1500 gallon per hour (GPH) pump as the primary and a pump of about 2000 GPH as a backup. The US Bureau of Shipping recommends a pump of 24 gallons per minute (about 1,440 GPH) and a 12 GPM (720 GPH) pump for vessels less than 65 feet.
Top 10 Best Bilge Pumps In 2022
When comparing the performance specifications of multiple pumps, ensure that the rating criteria are the same. New standards from the American Boat and Yacht Council (ABYC) require relevant manufacturers to evaluate pump performance against real-world use. ABYC requires pumps to be rated for 1m head (also known as vertical lift) and 3m pipe length, and 2m head and -6m pipe length. Head is the vertical height of the pipe outlet above the pump outlet. Head pressure (also known as static pressure) is the resistance the pump must overcome when pumping water up and out of the boat. This includes the resistance caused by the vertical distance the pump needs to move the water up (vertical lift) and the resistance generated by the discharge piping (pipe breaks, finned pipe, fittings and bends). Some ratings will also be given at 13.6V rather than the more realistic 12.2V (for a 12 volt system). The latter more accurately reflects the ability existing in real conditions.
Key Features: The automatic pump relies on a water level sensor such as a float switch to activate the pump. It can be a separate unit or a unit integrated into the pump. This sensor must be resistant to contamination and easy to inspect for proper operation. Ordinary float switches must be housed or they are more susceptible to fouling from debris in the bilge. An easily accessible strainer (or faucet) is also important, as are long lines to help keep connections out of the wet bilge area.
Location: According to ABYC, the pump inlet should be located so that bilge water can be removed when the vessel is in a static position and at maximum heel (ABYC H-22). The installation location must also allow servicing and cleaning of the pumps, especially the filters.
The exit opening (through the hull) must be above the maximum angle of inclination to prevent water from outside the boat from entering the boat. According to ABYC H22, if you cannot locate the discharge in this manner, a vent line (mounted above the corner waterline) and a properly fitted seacock should be incorporated into the setup. (Check valves should not be used in this scenario.)
Shoreline Marine Universal 1500 Gph Bilge Pump
When installing two electric pumps, the smaller pump should have a built-in float switch, be mounted at the lowest point in the bilge, and be connected directly to the battery via a fuse. The larger pump is mounted a few inches higher, but not directly above the smaller pump. As shown, you can mount the larger pump on a piece of plywood that is tied to the sides of the bilge. It must be connected to a dedicated circuit breaker that can be used as a switch, or it must also be connected to a dedicated rocker switch and clearly marked.
Plumbing: When plumbing an electric bilge pump, make sure the setup is designed to reduce head pressure as much as possible to maximize pumping capacity: use a smooth pipe that meets the recommendations you should; hose pipes should be kept as short as possible; and try to avoid bends, bends and elbow joints while running. In terms of increasing resistance, bending a 1 inch diameter discharge pipe 90 degrees is the equivalent of adding 3 feet of piping, which is like reducing a 3000 GPH pump to 2000 GPH. , when the battery is fully charged. According to pump manufacturer ITT/Regola, small electric submersible pumps are rarely useful with vertical discharge heads greater than 4 feet, and medium/large submersible pumps are similarly ineffective with heads greater than 7 feet.
The pressure line must rise continuously to the hull or loop. If there are low spots in the run, water collects there when the pump shuts off. This can create an airlock when the pump is reactivated and the pump will likely stop. Hose connections should be made with non-corrosive clamps as recommended by ABYC and should be airtight.
Wiring: use proper size wire and fuses: Proper wire size reduces voltage drop, and properly secured wires reduce the risk of the rotor locking (the motor tries to turn but can’t), causing overcurrent and a potential fire hazard. .
Shoreline Marine Sl52260 Automatic 800 Gph Boat Bilge Pump With Float Switch, 12v
Refer to American Wire Gauge’s 3% voltage drop chart (www.marinco.com/page/three-percent-voltage) to make sure you are using large enough wire. Remember that the run length given in the wire gauge charts is the sum of the positive and negative legs of the circuit; a pump 10 feet from the battery is called a 20-foot line.
Follow the pump manufacturer’s recommendation for fuse size and you should set it. The fuse must be installed within 7 inches of the power source per ABYC standards.
If the pump lines are too short, pull them out carefully. Use oversized tinned marine wire and hot glue connections. ABYC standards recommend using waterproof electrical cable sealed in the pump connection so that all electrical connections are made above the maximum bilge water level.
Accessories: Some accessories to consider for a bilge pump system are a visual/audible bilge alarm, a bilge switch, and a cycle counter. ABYC standards require alarms on ships with closed berths. Make sure the alarm is loud enough to be heard by the engine noise while underway and ideally by passers-by or dock staff.
I’m Having Trouble With The Water Bilge Pump In My 2005 298 Vista, Which Didn’t Seem To Be Working. I Replaced The Float
Automatic pumps must always be equipped with an easily accessible and clearly marked manual switch, so that even if the owner is not around, anyone (crew, port neighbors or passers-by) can find and activate the s-switch if necessary. The switches should also visually indicate that the pump is receiving power. Among the mercury-free bilge switches featured in the January 2006 issue, our top pick is the electronic Water Witch 230.
If the larger capacity pump has a float switch, we strongly recommend connecting it to a bilge alarm (and alarm switch). So hopefully the horn will get someone’s attention before the constant rotation of the pump drains the batteries. We reviewed the Aqua Vigil Alert in the May 15, 2001 issue and thought it was simple but quirky. We plan to review bilge alarms and cycle counters, including combination units such as the Aqua Alarm pump monitor, alarm and counter.
Regular and frequent inspections of bilge pumps are essential and should be included in a vessel’s general preventive maintenance program. This helps you know when to replace worn or damaged parts (bad float switches, worn hoses) before they fail. It is always a good idea to make sure the pump has power and is working properly before starting, bearing in mind that the test should check the actual pumping of seawater, rather than simply switching the pump (in the case of electric pumps). is turned on and monitors the operation of the engine.
Keeping the bilge water clean can be a challenge, but nothing compared to the headache of a locked rotor or an impotent bilge pump in an emergency.
Johnson Pump Ultima Bilge Pump 12 Volt, 800 Gph 32 47259 003
For more details on each pump, check out our latest tests of bilge pumps over 1500 GPH and smaller pumps over 1500 GPH.
For a more comprehensive guide to upgrading your boat’s essential systems, check out our 5-volume Marine Electrical Systems ebook series at https:///products.
To wash sails, most sailmakers recommend using mild soap and water and avoid scrubbing. If necessary, use a soft brush to loosen dirt. For more deeply embedded dirt or stains, you may need to soak the sails, so depending on the size of the dirty area, you may need to find a large container. Since we are ship changers, the most common confusion is whether or not to use a three-way switch.
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