Well the time has come to build a bit bigger boiler. Managed to get myself a 18gal keg and i plan to weld a 1/3- 1/2 of a 50ltr keg on the bottom for a sump and drain and hopefully get the boiler close to 100lt capacity.
Made a start today on cutting up the 50ltr to sit on the 18gal. Tedious job getting the shape right to follow the ribs and curve as well. Got there in the end, was just a matter of putting it on and off the 18gal a shite load of times and slowly grinding it to shape.