How are the baffles laid out in the Seawind 1370 Water Tank and how can I clean the tank?

The central wingdeck water tank is a closed composite tank with baffles throughout. The baffles are there to prevent the surging effect of water moving around when at sea, which moves signficant weight around the boat whilst also greating significant load aginst the water tank walls. 

The 1370 water tank has a series of 8 internal baffles as shown in the 3D images below.  The cental, lower cutout radius is 60mm, which allows for water to drain along the length of the water tank. 

So how can you access the tank?

There is an inspection port at either end of the tank. One forward in the mast base locker, accessed through the large central deck hatch. This inspection port is just in front of the main bulkhead. 

The aft inspection port is accessed by removal of a cover plate in the cockpit, just under the trifold door gutter. 

Next to the inspection port is the fresh water pickup pipe, allowing access to perform maintenance if needed. 

With access to both ends, and a tank baffle cutout at the lowest point of the tank shape, water can be flushed through the tank from front to back should it be contaminated.

Note:  Often the best method to clear a tank is through dilution. Filling, agitating and emptying a tank can often clear out unwanted debris. 

What if I still can't get the tank clear?

The 1370 was designed with long term maintenance in mind and as such, the water and fuel tanks are completely removable. There is a removable cap at the end of the wingdeck "Pod" that the water tank sits in as show below with these before and after shots taken from under the wingdeck. 

This is siliconed to the boat however once removed, and with the hoses disconnected, the GRP water tank can slide out the back of the boat, allowing better access for cleaning or if needed full replacement. 

Where can debris come from? 

Despite the flushing of the tank in the factoyr during the construction process, there is always opportunity for dust to be sitting in the pipes or equipment in the initial phases. Typically this is flushed out early on and once settled, debris is not a problem in the water system. 

With the introduction of the rain water catchment system, extra dilligence is needed to ensure that the water flow is diverted to overboard as a default to prevent any contaminants entering the water tank.