bige pumps

May I ask for input from the forum re types and their location around the BCC 28, presently working out where to place in Hull 126.

Stewart: Hi!

Zygote’s bilge is divided into three by bulkheads. She has 4 fixed bilge pumps, 3 electrical and one manual, plus a couple of other pumps that can be pressed into bilge pumping duties for emergencies and so on.

From bow to stern (following are excerpts from Zygote’s Boat Information Book):

A. Forepeak bilge
Water enters the forepeak bilge from:
? leaks in the seal between the deck and the Samson posts;
? deck washdown water flowing down the anchor chain navel pipe, especially when grit is flushed from the anchor windlass;

  • leaks from the sewerage system; and
    ? showering in the forepeak.

Pump: A Flojet Quad II diaphragm 4105-143 pump, mounted under the cabin sole just forward of the mast, can extract 12.5 litres/min (3.3 US gal/min) and draws up to 3.6 amps. The Flojet is a diaphragm pump, so it is self-priming and can run dry without damage.

A bronze strainer at the end of the pickup hose acts as a strum to minimise hair and other particles blocking the pump.

Water leaves the Flojet via nylon-reinforced PVC hose and exits from the central of the three bronze outlets on the transom, to port.

B. Cabin bilge
The cabin bilge can be divided into a shallow bilge and a deep bilge. The shallow bilge runs from the mast to the galley sink and is shallow because of the fibreglass-encapsulated lead ballast. The freshwater tanks sit on top of the ballast. Inspection plates around the mast give access to the shallow bilge.

Sea water enters the shallow bilge when swapping the water speed transducer for the through-hull bung. Freshwater enters the shallow bilge when rainwater runs down the mast and water leaks from the water tanks.

The shallow bilge drains aft into the deep bilge.

The deep bilge runs aft from the shallow bilge to the engine room. The through-hulls allowing entry of raw water, to cool the engines and for feed water to the Reverse Osmosis membranes, are in the deep bilge. The lower fuel tank occupies much of the forward part of the deep bilge. Access is via the inspection plate in the cabin sole, between chart table and the galley sink.

The engine bilge has two pumps: an automatic electrical pump and a manual pump.

The electrical bilge pump is a Rule 02 (1500 gph) submersible pump with a Rule Super Switch float switch. The Rule 02 pump is mounted on a teak board so it can be withdrawn from the deep bilge for cleaning. Water leaves the Rule 02 pump via a right-angle elbow to which is attached nylon-reinforced PVC hose. The water exits through the most inboard of the three bronze through fittings in the transom, to port. The Rule 02 pump can extract up to 94 litres/min (25 US gal/min) and draws 4.8 amps. The Rule 02 is an impeller pump. To avoid impeller damage, it should not be run dry.

A Henderson Mark V manual bilge pump is located under the deck at the stern to port, with its handle kept in the port bag for the mainsheet. The Henderson pump draws water from the bilge via a 1?? Shieldsflex marine wet exhaust hose and pushes the water out through a length of 1?? (38 mm) Shields sanitation hose to a 1?? through fitting in the transom, outboard of the genset exhaust, on portside.

The Henderson Mark V pump can lift water 1.5 metres and extract just under 1 litre for each pump stroke (the manufacturer claims that, if the head is 0.5 m and the lift 1.0 m, the Mark V can extract 42 litres/min (11 US gal/min) if pumped 45 strokes/min or 75 litres/min (20 US gal/min) if 80 strokes/min).

The Mark V pump installation uses a Henderson MH9905 deckplate kit. It has a white ABS housing and is interchangeable with the Mark V pump mounted at the Lavac toilet. The Mark V has a mass of 1.1 kg. The diaphragm is nitrile so it can pump diesel fuel without harm. The diaphragm can be worked dry without damage. The nitrile diaphragm and seals can be expected to perish and need replacement every 3+ years; replacements are in Whale/Henderson Service Kit AK8050.

C Lazarette bilge
A Rule 24 pump (360 gph) rated at 23 litres/min (6 US gal/min), is installed in the lazarette. The pumps draws 2.1 amps. The Rule 24 is an impeller pump; to avoid impeller damage, it should not be run dry. Water exits via nylon-reinforced clear PVC hose to the most outboard of the three bronze outlets on the transom, to port.



thanks for the prompt reply Bill and all the way from Oz, I note you have a genset, it seems that there is a fair bit of electrical to cope with your system.