The first welder I spoke to was not comfortable doing the diesel
tank, so passed the work onto another welder who has done multiple fuel
tanks in the past. Rate is AU$70 per hour plus consumables. He came and had a look at the work today, and went over the prep I need to do before Thursday. Seems poor welding was a contributing factor to some of the corrosion holes I have, so again I am the one having to pay to fix 27 year old problems.
1. All flammable liquids, thinners, fuels, paint
, gas to be removed from the boat before welding except the port diesel fuel tank
. There is a surprising amount of this on the boat with all of the work going on, but I don't smoke or cook on the boat at the moment, so hopefully won't blow up.
2. All flammable materials cleared at least 8 inches away from the holes (wood, spray on foam, wiring
, pipes, sonar sensor etc). This has taken a few days with hole saw, jig saw, and chisel and left quite a mess to clean up.
3. Sheet cement to be used as a heat block where it is not possible to clear all material.
4. Any oil
residue on the engine
room walls or in the sump to be removed.
5. Diesel tank to be washed with water
but not thinners.
6. Diesel tank to be ventilated, then filled with inert gas.
7. Plate to be heated with flame, then welding done with TIG.
8. All welding to be done from outside the boat, so any pits or thin plate section will be drilled or ground through the plate first instead of filled from inside. I drilled 3 more holes through the hull today, and will drill a few more tomorrow.
9. I am to stand by inside the boat with hose, bucket, and fire extinguisher. Not sure I will like being inside with the smoke and toxic fumes, but I guess better than losing the boat to fire.
I also got the quote back today for standing rigging
replacement. Will come to AU$8500-9000 which is rather a lot considering there is nothing wrong with the current rigging
, and the only reason to replace it is that insurance
companies won't cover rigging over 10 years old. Still thinking about whether I will get this done, or do what every previous owner did and leave it for the next owner.