Now that the busy season is behind you, it might be a good time to think about upgrading your vacuum truck fleet. You probably have a chassis and tank in mind, but what about the pump? Should you go with a rotary vane pump or a positive displacement (PD) blower?At their most basic level, PD blowers and rotary vane pumps both create negative pressure. Blowers use twin rotating rotors to displace air inside a tank, while rotary vane pumps compress air to create a void. When the load valve is opened, atmospheric pressure pushes debris up the hose and into
