Fuel tanks and their compartments

The boat is fitted with 2 fuel tanks which are in compartments Port and Starboard outboard of the engine room.

They have a total capacity of 160 gallons (727ltr) Please see below the original Fuel Consumption table.

When I first opened the fuel tank Deck hatches, the compartments had a lot of water in them, some had come through the hatch seals and some through leaks in the Hull around the exhaust outlets. The exhausts are water cooled, but they still generate heat, and combined with the sides of the engine room getting warm, condensation is a big problem. I have therefore decided to put a ventilation fan in each compartment, hopefully this will keep things in better condition.

After removing the Tank from the Starboard side I could then see the problem with Electrolysis (caused by metal in contact with damp wood) and the Heating up of the timber "drying" it out. In the past the Hull has been strengthened, but also Fibreglass resin has been cast around the Exhausts. This was not really a good fix because it is not flexible, and once cracked allowed water to seep into the spaces from the sea, as the exhausts are under water. This can be rectified by repairing the fibreglass "bedding" and then using a flexible mastic to bed the exhausts into.

Because of the dampness, various other fittings need attention, as do the tank straps, which being only Galvanised steel have corroded through. To be replaced with new Stainless steel ones.

Once this compartment is fully dry it will be Repaired, Painted out and everything re-fitted. This has now all being done and the fuel has now been pumped from the Port tank via the new Fuel Polishing system. We soon have to start the same procedure on the Port side!

 

  
Fuel consumption chart from
1974 sea trials (After re-fit)

  • Very Damp Very Damp
  • Doesnt look good! Obviously leaking around Exhaust, and quite a few planks "opened up" Doesnt look good! Obviously leaking around Exhaust, and quite a few planks "opened up"
  • Flange nuts on top of tanks need replacing with Stainless steel. Flange nuts on top of tanks need replacing with Stainless steel.
  • Stb'd tank on its way out, tank in good condition. Stb'd tank on its way out, tank in good condition.
  • Someone obviously couldn't get the right bolts Someone obviously couldn't get the right bolts
  • Diesel spill pipe, in new position, who used Ply?? Diesel spill pipe, in new position, who used Ply??
  • Ply patch removed, hiding rotten timber! ah well just another thing to add to the list. Ply patch removed, hiding rotten timber! ah well just another thing to add to the list.
  • Stb'd Tank void looking Fwd, prior to cleaning Stb'd Tank void looking Fwd, prior to cleaning
  • Stb'd Tank void looking Aft, prior to cleaning Stb'd Tank void looking Aft, prior to cleaning
  • Looking forward showing water cooled exhaust. Looking forward showing water cooled exhaust.
  • From outside, the "Timber Ring" is an addition sometime in her life, to strenthen the hull From outside, the "Timber Ring" is an addition sometime in her life, to strenthen the hull
  • Exhaust hull fitting removed. Exhaust hull fitting removed.
  • Exhaust hull fitting. Exhaust hull fitting.
  • Original "Pads" rotten, so outside Pad added sometime, pity it wasnt beded to the hull, making more places for rot to take hold! Square pad above and left of pipe, was for original diesel overflow, the tanks were moved and turned through 180 when the self righting conversion was done Original "Pads" rotten, so outside Pad added sometime, pity it wasnt beded to the hull, making more places for rot to take hold! Square pad above and left of pipe, was for original diesel overflow, the tanks were moved and turned through 180 when the self righting conversion was done
  • close up of previous photo close up of previous photo
  • Outside pad's, later on found out they were not bedded, and hull had been completly hacked away. Outside pad's, later on found out they were not bedded, and hull had been completly hacked away.
  • Looking cleaner, repairs needed! outer pads removed and someone had "hacked" away the hull! Looking cleaner, repairs needed! outer pads removed and someone had "hacked" away the hull!
  • Look what it hid!  Work needed, i think! Look what it hid! Work needed, i think!
  • outer hull prepared for "graving" pieces outer hull prepared for "graving" pieces
  • inside tank, fantastic condition, just needs a good steam clean. inside tank, fantastic condition, just needs a good steam clean.
  • stb'd tank out for cleaning! another "simple" job that took a day! stb'd tank out for cleaning! another "simple" job that took a day!
  • looking better looking better
  • all new stainless nuts, to replace steel ones and new dip pipe to "extract" water and gunge all new stainless nuts, to replace steel ones and new dip pipe to "extract" water and gunge
  • Engine room~tank space bilge, corrosion between the 2, neautralised, epoxied and then plated Engine room~tank space bilge, corrosion between the 2, neautralised, epoxied and then plated
  • Starting to look better, New inner pads (see hull page for outside repairs) first coat of bilge paint. Not pretty....just functional. Starting to look better, New inner pads (see hull page for outside repairs) first coat of bilge paint. Not pretty....just functional.
  • looking aft, square trunking is original ventilation to aft hold. looking aft, square trunking is original ventilation to aft hold.
  • painting finished. just got to re-assemble everything painting finished. just got to re-assemble everything
     

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