Tank cleaning arrangement

Abstract

A tank cleaning arrangement comprising a tank having an inlet and an outlet; a flexible bladder located inside the tank, the bladder having a first end in fluid communication with the tank inlet and a second end in fluid communication with the tank outlet, the bladder defining an interior to receive content via the inlet and to expel content via the outlet, the bladder positioned inside the tank such that a space exists around the bladder inside the tank; the arrangement further comprising a pressure port extending from outside the tank into the space around the bladder via which varying pressure can be applied to the space to cause varying expansion and contraction of the bladder.

Dependencies are inferred from the claim text.