Tankage

---

Tonina holds about 1,000 gallons of crystal clear fresh water in two self-leveling stainless steel water tanks. The tanks are vented into her bulwarks to avoid any chance of seawater from entering them. 

These tanks are positioned far aft in her lazarette to provide excellent trimming capabilities in potential storm conditions. In the event of heavy weather, her tanks can be topped-off using her 1,000GPD Village Marine reverse osmosis water maker, trimming the vessel further aft to allow the bow to ride lighter and higher to better meet the oncoming storm.

One doesn't often think much of their fuel tanks until there is a problem (then they think about them way too much). 

Tonina holds about 3,000 gallons of diesel in four separate black iron tanks, all in her engine room to better provide sound deadening throughout the boat. The tanks each have a  sump in the bottom to capture any water that might enter, the sump has a separate drain several inches below the fuel pick-up (they have never rendered water). 

Tonina's tanks are all encapsulated in thiokol (a tar like substance) on the exterior and prior to sealing them up during fabrication, they were sand blasted to a mirror like finish inside. Upon inspection in 2015 (out of curiosity), one of her tanks was opened up to find that same mirror like finish that had been rumored. Tonina can run more than 1,000 hours without the need to change a Racor fuel filter, and even then they aren't visibly dirty. The fuel vents are located on the side of the house, just below the overhead; this puts them about 6' above the deck level. They are protected from rain and any possible seawater intrusion. 

One of the more brilliant features in Tonina's fuel system (still not seen in modern vessels, and I can't understand why), is a fuel manifold that receives the engine's hot fuel return. Most tanks received the return fuel directly back into the main tanks or to a day tank. This hot fuel has a tendency to warm a tank which in turn creates condensation on the cool tank tops/walls. This water over times creates rust and coupled with the warm fuel, a breeding ground for algae. Tonina's tanks remain a constant temperature from this simple and highly under-rated device. 

Each of the two heads has a separate self contained holding system. The redundancy ensures that there is always a usable toilet on board. The tanks are polyethylene with level sensors. 

Tonina carries 75 gallons of lube oil in a standalone, powder coated stainless steel tank in her engine room. This tank is equipped with a fill spout for easy dispensing for oil changes aboard. 

What! Gas tanks!? Yes, Tonina is equipped with a a fueling station for her tenders. The boat deck holds a 150 gallon stainless steel tank with a dispensing hose capable of reaching the water line to fill any boat that might pull alongside. The gas tank is installed outside to avoid any explosive vapors from potentially entering her interior spaces.