I have an ex-Black Prince probuild narrowboat which has the weed hatch apparently through the fuel tank. The hatch is secured by a bar across two steel loops welded to the tank.
One of these loops has failed ( maybe my fault over tightening weed hatch - appears to be ductile failure of one loop, see picture ). It seems to me that I will need a new loop welded in, but this is on top of the diesel tank.
I believe the diesel tank is integral with the boats structure - so does this mean the diesel tank need to be drained first and inerted before welding ? Does it then require pressure testing again ?
Any advice on practice here ?