Norbert Dentressangle powder tanker job?

Christ dieseldave thats put me on the spot :open_mouth:

The more free space there is in a tank the longer it would take the compressor to get the tank to pressure. If you have a small tank filled to the top with a dense powder like 30t of cement nearly to the lids it would pressure up quickly and give you plenty of free air to push it up the pipe. The same stuff in a big tipper might come say half way up the tank with the rest of the tank empty. The same compressor producing the same volume of air would have to pressurise the empty space as well as the cement and provide the line pressure (boost). Probably not well explained…

That said cement flows easily so I guess it’s fairly academic.