Hose clamps were used to connect the pump to the hose. A 12V battery provided the power. We also used waterproof cable connections between the battery and the pump for the power supply to avoid possible corrosion.
The positive line was fitted with an appropriate fuse and the battery was connected to a charger to ensure a constant voltage of 12 V. Each pump was connected to the power supply, the hose attached and placed in our bilge the lower tank , one after the other. We started each pump manually or it was activated by the float switch.
The clock was started when the pump began transferring water into the upper tank and was stopped after 50 l had been pumped. Our test showed that the bilge pumps needed between 47 seconds and min to pump the required 50 litres.
The best bilge pump in our test was from Attwood. It reached the 50 L mark in an unbeatable In fact, it was almost nine seconds faster than the next best pump in our test. If you compare the outputs stated by the manufacturer with the results of our SVB bilge pump test, a high output does not necessarily mean that the water is pumped out more quickly.
In our test, the results were varied. For example, the electric bilge pump in first place has a max. The one in second place has a max. Based on the results of the test, the following conclusions can be made: Our test winner was able to pump more litres per minute than stated by Attwood.
In our test, it would be ATTWOOD's second pump was also the second-best bilge pump in our test, but based on our results, it did not perform as well as the manufacturer states. It should have taken 43 seconds to pump 50 litres, but in our test, it took 12 seconds longer.
The Rule, Whale, Johnson Pump and Ocean Technologies pumps all took longer to reach 50l than the manufacturer's specifications suggest. These pumps should have been able to deliver the water between 41 and 60 seconds, but in our test, they took between and min. This means that they took twice the time they should have, and the pump that came last actually took just over three times as long.
It should be noted that this bilge pump comparison was carried out based on our own criteria, which does not match the conditions under which the manufacturers test their pumps. Various factors such as discharge head and hose diameter must also be considered when determining the output performance of a bilge pump. During the test, it became apparent that, in addition to the general performance, the size of the hose diameter also plays a decisive role.
The larger the hose diameter, the higher the pumping capacity of the bilge pump. Most boats are operated with a 12 or 24 V on-board power supply. Usually, the power for an electric bilge pump is taken from an onboard battery. When the battery is fully charged, as in our bilge pump test, it supplies greater current at 12 V about Larger boats should have one in each enclosed area that can retain water.
Discharge outlets need to be a minimum of eight inches above the waterline. All bilge pumps on the boat should be accessible, so you can inspect the pump and its float, and clear debris from around the pump pickup. The pump may have a float or switch to turn it on automatically when water collects in the bilge.
The pump may also just have a manual switch at the helm. Regularly inspect the area around the pump for debris, which could clog the pickup or foul the pump. Surprisingly, this is especially important on new boats, as all kinds of construction debris — sawdust and fiberglass dust, bits of foam and epoxy, even screws—can work its way back to the bilge.
Periodically, check the function of the float switch, which can get crusty or corroded over time. And did we mention having the boat sink? Getting this water we call it nuisance water out of your boat is the primary function of a bilge pump.
In some cases, the leak may be of a catastrophic nature caused by a hole in the hull from a collision or a wave taken on board in a storm. These situations call for very large pumping capacity.
For the most part, the largest pumps will only buy you a little time to effect repairs to the leak, limp back to shore or make preparations to abandon ship. For emergency situations like this, it is advisable to have multiple electric pumps and at least one high-capacity manual diaphragm pump.
Planing runabouts and ski boats use one submersible pump located aft. Small boats with large cockpits or low freeboard need bigger pumps. A small racing keelboat that sees lots of rough water action will need a better pump system than a large powerboat that is mainly operated on a calm lake. Here are some suggestions:. Electric bilge pumps are rated by their capacity, which is measured in gallons per hour, or gallons per minute, under open flow conditions with no restrictions to the discharge.
The rule of thumb is to get the largest model that is practical for the boat. Your selection will depend on size constraints and power limitations, but choose a 1,gph model or larger, if possible. Submersible pumps generally have great open flow capacity, which rapidly decreases depending on how high the water is lifted. Match existing hose sizes and wire capacity, unless you want to upgrade the wiring and the thru-hull size too. Buy the largest capacity pump that uses the same hose diameters.
For a few dollars more you can increase pump capacity significantly and still keep the same hose diameter. For a new installation, use the largest practical pump size. For this reason, we recommend that, in addition to any electric pumps , you have at least one high-capacity manual diaphragm pump. Manual pumps can move substantial amounts of water up to 30 gallons per minute or so. With the exception of the higher-end pumps, most are very tiring to use, so be careful in your selection.
Each gallon of water weighs over 8lb. An appropriate installation location and an effective pump is critical. When selecting a manual pump, it is most important to consider the gallons per stroke and the ergonomics of the pump. If you want automatic operation, you need to install a bilge pump with a built-in or external float- or electronic-water-sensing bilge pump switch. Automatic pumps are great for removing small amounts of water but do not allow your automatic pump to lull you into a false sense of security.
But when it does, a potential sinking awaits. The moral here is trust but verify.
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