A compressor is a piece of equipment that compresses gas either to transfer to a specific location or for a certain process requirement. Compressor are manufactured depending on application and can be class into two basic types; positive-displacement and centrifugal.
Integrally geared centrifugal compressors can operate at many times higher speeds than reciprocating compressors. The higher speeds ultimately result in smaller package sizes, requiring a smaller footprint as compared to a reciprocating compressor. The operating speed of a reciprocating compressor is very slow due to mechanical and dynamic limitations. Furthermore, the lower speed of reciprocating compressor lends itself to larger compressor size, heavier weight, and larger plot plan size. Whereas the centrifugal compressor with higher operating speeds results in smaller overall compressor package sizes such as smaller gearing, bearings, seals, lubrication system, and foundation. Smaller packages ultimately lend themselves to saving in lower overall installations as well as lower capital and spare parts costs.
Higher reliability is fully attainable with centrifugal compressors. The rotating aerodynamic components (impellers) have no physical contact with the stationary parts (inlet shroud). On the contrary, the reciprocating compressor moving components such as the piston and valves are physically in contact with the cylinder and other stationary components during operation. The physical contact causes wear and tear of both moving and stationary components, which requires constant maintenance. However, a centrifugal compressor operates for many years with continuous service without overhaul maintenance, resulting in less power plant down time. This eliminates loss of product, provides more profit, lowers risk, and results in lower maintenance cost. Overhaul periods are more predictable by analyzing characteristic efficiency and vibration trends. A typical centrifugal compressor overhaul inspection period is more than 7 years as compared to less than 2 years for most reciprocating compressors.
In addition to the economical advantages of implementing a centrifugal compressor over a reciprocating compressor, many technical advantages are also evident. The centrifugal compressor discharge pressure can be regulated to less than 0.5% per second. The well-regulated compressor discharge pressure provides very steady supply of fuel to the gas turbine. This is an advantage since it does not cause additional burden to the turbine controls. On the other hand, a reciprocating compressor at best can provide 2% or more of pulsating pressure. Unsteady supply of fuel may cause hardship on the turbine control system. A reciprocating compressor would require an impractically over-sized pulsation bottle to minimize supply pressure pulsation to the level as steady as a centrifugal compressor.
Considering there is no physical contact between the centrifugal compressor aerodynamic components, the need for lubrication within the compression components is not required; thus it will not add oil or other contaminants to the process gas. However, a reciprocating compressor requires oil lubricant for the piston rings. This oil eventually ends up in the process gas or it has to be separated to protect the gas turbine. Due to physical contact between the piston rings and the cylinder, the wear of the rings and packing causes particle contamination of the fuel gas. Hence, this contamination could cause premature wear on the turbine blades and other turbine fuel gas passages
If we install centrifugal pump to transfer liquid from tank,after empty out the tank pump is continiously running,then how much vacuum is created in tank?
Because the centrifugal pump cannot pump air due to its loose tolerances, the positive displacement pump is needed to create the vacuum.
it is due to the difference in the air intake and impeller construction.
A pump produces movement in the fluid it is pumping. It does this by creating:a low pressure zone into which the fluid is drawn (vacuum pump)a high pressure zone which the fluid wants to escape from (tire pump)A physical displacement of the fluid (gear pump, worm pump)centrifugal forces which move the fluid outwards from its center
Hi, Both are API Standards,which define the specification about wellhead is 6A. and which is define the specification about centrifugal pump is 610. Refer API STANDARD. All the best.
yes that is centrifugal pump because the turbine pump creates a vacuum pressure on pipe.
voloute convord the pressure into volicity and the mixtur of propallere and impeller is called turbine pump
They may be the same thing.
If we install centrifugal pump to transfer liquid from tank,after empty out the tank pump is continiously running,then how much vacuum is created in tank?
A monoblock pump is a small pump that has no base plates, couplings, or guards, which keeps it small. A centrifugal pump is larger, with added features and impellers to give the pump hydraulic lift.
PD or positive displacement pump has a piston which directly contacts the fluid. In a centrifugal pump the impeller creates a patial vacuum inside the casing due to which suction takes place. Discharge takes place by the rotation of the impeller.
Because the centrifugal pump cannot pump air due to its loose tolerances, the positive displacement pump is needed to create the vacuum.
A centrifugal pump works by using centrifugal force. A multi pump is short for a multistage centrifugal pump with two or more impellers.
The centrifugal pump has to be filled with fluid before it can start to move fluid. They cannot suck fluid in by creating a vacuum in the pump chamber like some other types of pumps.
it is due to the difference in the air intake and impeller construction.
pump is used to handle liquid and compressor is used to handle gases. other difference include blade shape etc..
Yup. I do have. I have gear pumps, water pumps, diaphragm pumps, vacuum pumps and blowers, submersible pumps, centrifugal pumps and filters.