Cockpit and sink drains questions

[Boo2]

Hi,

Sunrunner has 1.5" cockpit drains which drop to the very bottom of the hull either side of the keel and exit through ball valves. The survey I had done said :

Port drain - Clear braid reinforced plastic. The use of this material beneath the waterline is not best practice. Replacement in heavy duty spirally reinforced hose is recommended.

Can anyone tell me what the best stuff to use is and who stocks it ? In the attached pic (see below) the port drain has a right angle bronze elbow, I assume this is to keep the plastic pipe away from the exhaust and I should keep it in the new setup ?

The gally sink arrangements drew similar criticism :

Sink - Discharges into the starboard cockpit drain via a hand pump...This is not considered to be a satisfactory installation as any failure of the near, or below, waterline pump or pipework can lead to the possibility of flooding the vessel. It is very strongly recommended that the discharge is re-piped to a skin fitting high in the topsides and the starboard cockpit drain replaced in its entire length using a heavy duty reinforced plastic hose.

I assume the type of hose for the left and right drains should be the same, but what is required for the sink drain ? If it exits above the waterline does it still need to be spiral reinforced ?

Still on the galley drain, the sink waste is 1" diameter but I'm not sure the pump inlet and outlet are the same, should I get 1" dia hose and skin fittings/ball valve and buy a pump to suit, or is it possible to get diameter adaptors ?

Any comments welcome, pix of the cockpit drain follow (I don't have any for the galley sink waste arrangements except to say that the small dia hose entering that big lump of bronze is the current sink waste pipe).

Thanks,

Boo2

 

[saltylegs]

try here
http://www.asap-supplies.com/marine/intake-hose

 

[sailorman]

any 1/2 decent swindlery will stock spiral hose

 

[Deleted member 36384]

I would purchase some fire retardant blanket / wrap to protect the cockpit drain hoses if they run through an engine space. It is not mandatory by far and some may even consider it unnecessary, after all an engine room fire will probably destroy the boat before she floods. Still, its quite low cost and easy to do.

On my own boat I have two galley sinks terminating into one below water line seacock and skin fitting. In fact most boats I have been familiar with have their sinks discharge below the water line. I would not be too worried about a galley sink terminating into a cockpit drain if the hose assembly and fittings were sound, accessible, maintained, secure and of the correct size and specification.

When considering sinks and their drain outlets you need to consider the relative elevations when healed. For example, if healed well over does the sink waste outlet elevation equal to the seacock elevation. If it is you may get back flow from the sea to the sink. This is a problem on some boats and a pump can be a solution to back flow, if the elevations can not be changed.

When fitting the spiral would waste pipes a hair dryer can be used to soften the plastic before pressing over a skin fitting. Use quality, stainless hose clips and for the sake of argument, use 2 hose clips at each end. To be honest though a correctly sized hose and hose clip, of the correct material, is a secure, reliable method of fastening. The 2 clips is probably a throw back to days when stainless was not that common.

 

[Tranona]

The Vetus catalogue www.vetus.com has 3 pages of hoses with descriptions and uses. Any halfway decent chandler will have what you want.

Most sink drains exit below the waterline with a ball valve, otherwise they will not drain on one tack. Washbasin wastes are sometimes through the topsides as normally they are onlused when at rest. However, they still may need a ball valve otherwise you can get back flooding when heeled over.