What does "to dowel an equipment" connote? (referred to rotation machinery)?
Dowels are meant to locate, fasteners lone fasten.
I've never heard the term, but I would guess that it may involve putting a rod (dowel) into a hole i.e. designed to prevent the equipment from turning.
It is a process where a piece of rotating equipment is fixed to its base once it is fully aligned. This is over and above the use of anchor bolts. It is not other done and some believe it is an unnecessary step in equipment alignment.
Typically a hole is drilled through the equipment and the base. The hole is narrowed and a tapered rod or dowel is driven into the hole. With two dowels, a pump or compressor can be held so it will not slide around and if moved can be put back contained by the exact place it should be.