A vacuum truck is a tank truck with a heavy duty vacuum designed to pneumatically load solids, liquids, sludge or slurry through suction lines typically 2-4' in diameter with 3' being the norm. The typical pump used in the industry is the rotary vane vacuum pump. The truck can be configured to be a direct PTO/belt or a PTO/hydraulic drive system. There are two different ways to mount the pump either directly on the truck with PTO drive or on the trailer with a pony motor. Each application has different handling characteristics. The trucks are often used by towns and municipalities for street cleanup, sewers, individual septic systems and can also be used for cleanup of contaminated soil.The trucks are used in the cleaning of sanitary sewer lift stations and in the pump out of grease interceptors that are required at many restaurants. The trucks are mostly used in the petroleum industry, for cleaning of storage tanks and spills. They are also an important part of drilling oil and natural gas wells, as they are located at the drilling site. Vacuum trucks are used to remove drilling mud, drilling cuttings, cement, spills, and for removal of brine water from production tanks. They dispose of this in sump pits, treatment plants or if within safe levels may be spread out in a farmer's field.