Here’s an older post where I added some pictures of some 50 gpm pumps they used at a jobsite where I worked. I use to work as a Boilermaker and did a lot of work in power plants. They always wash down the inside of the boilers to get rid of fly ash before we’d go in to make repairs. From what I’ve heard the engines are about 2000 hp. The engines are big diesels. Probably comparable to a semi engine or large tractor. They have quite a few mounted on semi trailers. They feed them with 2" supply hose and use 1"-1.5" pressure hose.
Here’s the link to the pictures. Bidding on City Jobs - #45 by marinegrunt
