Sea Cocks


What is a sea cock and why is it important?

 

Sea Cocks

 

The Seacock is made of silicon bronze or fibreglass reinforced nylon (marelon). Gate valves are prone to corrosion and are difficult to tell if they are fully closed or open if blocked. Therefore a lever, operating through 90 degrees, gives a better guide as to open or closed. Open is line with the outlet hose, closed is across the outlet hose.     

 

Sea Cocks play an important part in preventing ingress of water to the boat. The simple action of turning a handle through 90 degrees will prevent the boat from flooding. Any thru hull fitting that exits the boat below the waterline should be fitted with a seacock. Consideration should be given to holes above the waterline that are submerged when the boat heels.  

 

The function of the seacock is to protect the boat from flooding. Therefore access to the seacock should be easy in case of an emergency. If the sea cock should fail, seized open or closed, we will be unable to allow water out or in. We should therefore ensure the sea cocks work by using them, by this I mean they should be worked, opened and then closed several times and if any tightness is felt they should be serviced. They should be serviced as a minimum annually.

 

 

The servicing of sea cocks is best done whilst the boat is on the hard standing or dried out between tides. If this is not possible a soft wooden bung should be tapped into the hull fitting to prevent ingress of water. Soft wooden tapered bungs should be attached to each sea cock in case of an emergency.    

 

   

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GT Yachting October 2012

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