If your wanting to use it for chip removal, grit/sand blasting & spraying then a 50 ltr tank isn't very big at all even though it may sound it. All 3 functions would benefit from a larger tank & don't forget there may also be times when you want to do more than one thing at a time, say you have a job to cut that takes a few hours, you may want to do some spraying or blasting while the job is cutting.