Piping rotary pump

When started, the rotary pump carmot generate an underpressure to suck in the liquid to be pumped, and the suction pipe and the pump must therefore be filled with liquid. Hence, startup and shutdown are carried out in situ against the closed valve on the pressure side. For reasons of availability, generally two pumps are combined to give a pumping station (Figure 2.4-5). 

A slurry pump operating at 1 atm must be selected to transport a coal slurry from an open storage tank to a rotary drum filter, at a rate of 250 gpm. The slurry is 40% solids by volume and has an SG of 1.2. The level in the filter is 10 ft above that in the tank, and the line contains 400 ft of 3 in. sch 40 pipe, two gate valves, and six 90° elbows. A lab test shows that the slurry can be described as a Bingham plastic with v = 50 cP and t0 = 80dyn/cm2. 

The sample stream enters through a PVC pipe [1.2-cm outside diameter (OD)] extending 0.5 m in front of the fish and passes through the pump and up the hose, thus, contacting only PVC, Tygon, and Delrin. The hose and rotary joint at the winch are nylon. 

A continuous stream of mud is pumped into the hollow drill pipe and bit while the rotary table turns. Openings at the end of the bit allow the mud to rise between the drill pipe and the sides of the well. This fluid lubricates and cools the bit while transporting excavated material to the surface. It also acts as an eroding agent in soft rocks and cakes the sides of the well to prevent drilling fluid from being lost. 

Turbo-drilling was pioneered in California in the 1940s. But, it was perfected by the Russians and it is almost standard equipment in Russia. The turbo-drill can be 12 times faster than a rotary. The bit is rotated by the hydraulic power of the mud stream pumped down through a non-rotary pipe. A turbine below the drill pipe converts the hydraulic power of the mud stream into rotary power. 

A mud rotary rig cuts a borehole by rotating a bit into the formation materials and removing the cuttings by continuous circulation of a drilling fluid. In a conventional rotary system, mud is pumped down through the drill pipe and out through nozzles in the bit. The mud flows upward in the annular space around the drill pipe to the surface, where it is channeled into a settling pit and a... 

The heart of this drying system is a rotary-valved pulse combustor. Referring to Fig. 7.81, combustion air (1) is pumped at low pressure into the pulse combustor s outer shell and flows through an unidirectional air valve (2) into a tuned combustion chamber [ Helmholtz Resonator (3)] where fuel (4) is added. The air valve closes. The fuel-air mixture is ignited by a pilot (5) and explodes, creating hot air which is pressurized to approx. 0.2 bar above combustion air fan pressure. The hot gas exits the chamber through a pipe (6) towards the atomizer area (7). Just above the atomizer, quench air (8) is blended in to achieve the desired process temperature. The orifice releases the liquid... 

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