In article ,
Greenwif wrote:

I've got access to some very large used catering size food oil cans.
They are quite colourful and thought it would be fun to grow some veg in
them. i've seen this done in South america. But I'm at a loss as how to
remove the lids, as at present all they have are holes punched in the
top to get out the oil. I'm sure my normal kitchen can opener would not
cope with the thickness of the metal. Any suggestions?

Beware of sparky options (someone suggested an angle grinder). Oil fumes
igniting in a mostly-closed vessel can be more interesting than you want
to be standing next to.

For 55 gallon/210 liter barrels a cold-chisel and a hammer work just
fine - would also work fine (might grab a smaller chisel if you have
several) if you're working with more like 20 liters. Sharpen the chisel
first if need be.

--
Cats, coffee, chocolate...vices to live by
Please don't feed the trolls. Killfile and ignore them so they will go away.