At the moment I am waiting for a film to be developed - the pictures will show a new development. This is a system for controling an In Place Cleaning system by pneumatic controls. As air is the operating medium it cuts out the need for electrical connections which gives a greater safety factor when dealing with cleaning fluids.
 
 

We have, however, revived from the past, a mobile version of the Hydraulic Jet Cleaner.

This is, in effect an HJC mounted on a trolly, fitted with steam and water inlets. This allows the Hydraulic Jet Cleaner to be moved around the plant, and used wherever there is a steam and water supply point. They proved most popular in the 1980's with petrochemical and oil plants, but still seem to have a useful role to play in modern industrial applications.