0
A reciprocating pump is basically a piston in a cylinder with 2 check valves in ports in front of the piston. When the piston is moving back in the cylinder, a check valve allows fluid to fill the cylinder from the intake port, while the discharge port is blocked by its check valve. When the piston goes back the other way, the check valve in the discharge port allows fluid to pass while the check valve in the intake port closes.
Add your answer:
Earn +20 pts
Are the triplex mud pumps centrifugal?
No, they are reciprocating.
Where we use positive displacement pumps?
A positive displacement pump causes a liquid or gas to move by trapping a fixed amount of fluid or gas and then forcing (displacing) that trapped volume into the discharge pipe. Positive displacement pumps can be further classified as either rotary-type (for example the rotary vane) or lobe pumps similar to oil pumps used in car engines.Moreover,these pumps give a non pulsating output or displacement unlike the reciprocating pumps and hence are called positive displacement pumps
What are the advantages of having an under floor heating system?
There are many advantages to having an underfloor heating system. The main advantages are their ability to work with heat pumps, and their no maintenance set up.
What is the difference between reciprocating pump and reciprocating compressor?
Though these words may be used interchangeably, there is a difference. A pump is a motor designed to move fluids (whether gas or liquid). A compressor is a kind of pump that has a motor that forces air molecules closer together to pack more matter in a smaller volume. Gases are the only things that are compressable where pumps deal more with liquids (mainly water) although there are air pumps. More.. Pumps are used to move liquids of all kinds not just water. They can be driven by electric motors, steam turbines, wind power etc. Compressors move gasses. We sometimes use what is called a tire pump to inflate bicycle tires but it is actually a hand powered compressor.
What is Klein's method of construction for reciprocating engine mechanism?
a graphical method to find velocity and acceleration of piston of a reciprocating engine
Are the triplex mud pumps centrifugal?
No, they are reciprocating.
The advantages and disadvantages of reciprocating enjines?
advantage and disadvantage of reciprocating engines
Advantages of double acting reciprocating pump?
Reciprocating pumps will deliver fluid at high pressure (High Delivery Head).They are 'Self-priming' - No need to fill the cylinders before starting.
Where do you use reciprocating pumps in daily life or in industrial applications?
Daily life you use reciprocating pumps buy using your water faucet, pumping gas or simply using a suringe for medicine.
What are the advantages of a reciprocating pump?
we can pump water in high current
What is the advantage and disadvantage of reciprocating compressors?
The advantages of the reciprocating compressors is that it is easier to install and is very simple to install. The disadvantage of the reciprocating compressor is the high cost of maintaining it because of the many moving parts.
Is receiprocating pump advantageous or centrifugal pupm?
A reciprocating pump is an advantageous pump. Centrifugal pumps convert energy into rotation to power themselves. A reciprocating pump uses a back and forth linear motion.
Which pump is more efficient Centrifugal pump or reciprocating pump?
positive displacement pumps will always be more efficient than centrifugal pumps due to a centrifugals inherent internal fluid slip recirculation and losses.
What is the differences between positive displacement pump and centrifugal pump?
Pumps -- Centrifugal vs. Positive DisplacemenTwo Categories -- Kinetic (Centrifugal) and Positive Displacement There are two main categories of pumps - kinetic and positive displacement. Almost all pumps fall into one of these two categories. The main difference between kinetic and positive displacement pumps lies in the method of fluid transfer. A kinetic pump imparts velocity energy to the fluid, which is converted to pressure energy upon exiting the pump casing. A positive displacement pump moves a fixed volume of fluid within the pump casing by applying a force to moveable boundaries containing the fluid volume.Kinetic pumps can be further divided into two categories of pumps -- centrifugal and special effect. Special effect pumps include jet pumps, reversible centrifugal, gas lift, electromagnetic and hydraulic ram. Special effect pumps are not commonly used relative to centrifugal pumps, so they will not be covered in this course. Positive displacement pumps are also divided into two major pump categories -- reciprocating and rotary. Reciprocating pumps transfer a volume of fluid by a crankshaft, eccentric cam or an alternating fluid pressure acting on a piston, plunger or a diaphragm in a reciprocating motion. Rotary pumps operate by transferring a volume of fluid in cavities located between rotating and stationary components inside the pump casing. The relative features of reciprocating and rotary pumps, as well as centrifugal pumps, will be covered in this course. Figure 1 below shows the major pump categories and the types of pumps within each category. Figure 1 -- Major Pump CategoriesComparison Table -- Centrifugal vs. Positive Displacement Pumps Table 1 below outlines some of the main differences between centrifugal pumps, reciprocating pumps and rotary pumps. Note that "centrifugal", "reciprocating" and "rotary" pumps are all relatively broad categories. The table below provides a comparison of features between these pump categories that generally holds true. However, there are exceptions. For example, reciprocating pumps generally require more space than centrifugal pumps for a given flow rate. But, there may be specific applications where a positive displacement pump requires less space relative to a centrifugal pump. Also, note that Table 1 lists typical maximum flow rates and heads. It is possible to build special pumps outside the upper bounds of the pressures and flow rates listed, but such pumps would be prohibitively expensive for most applications. ParameterCentrifugal PumpsReciprocating PumpsRotary PumpsOptimum Flow and Pressure Applications Medium/High Capacity,Low/Medium PressureLow Capacity,High PressureLow/Medium Capacity,Low/Medium PressureMaximum Flow Rate 100,000+ GPM10,000+ GPM10,000+ GPMLow Flow Rate Capability NoYesYesMaximum Pressure 6,000+ PSI100,000+ PSI4,000+ PSIRequires Relief Valve NoYesYesSmooth or Pulsating Flow SmoothPulsatingSmoothVariable or Constant Flow VariableConstantConstantSelf-priming NoYesYesSpace Considerations Requires Less SpaceRequires More SpaceRequires Less SpaceCosts Lower InitialLower MaintenanceHigher PowerHigher InitialHigher MaintenanceLower PowerLower InitialLower MaintenanceLower PowerFluid Handling Suitable for a wide range including clean, clear, non-abrasive fluids to fluids with abrasive, high-solid content.Not suitable for high viscosity fluidsLower tolerance for entrained gasesSuitable for clean, clear, non-abrasive fluids. Specially-fitted pumps suitable for abrasive-slurry service.Suitable for high viscosity fluidsHigher tolerance for entrained gasesRequires clean, clear, non-abrasive fluid due to close tolerancesOptimum performance with high viscosity fluidsHigher tolerance for entrained gasesTable 1 -- Comparison TableCapacity The wide variety of centrifugal pumps manufactured offer a relatively large range of available capacities. Radial-flow and mixed flow pumps are used for low to medium capacity applications. For high capacity applications, axial-flow pumps are capable of delivering flow rates in excess of 100,000 gpm. Centrifugal pumps are not stable at low flow rates, although there are special low-flow centrifugal pumps available that can deliver flow rates less than 10 gpm. However, for extreme low-flow applications (< 1 gpm), positive displacement pumps are a better selection.Reciprocating and rotary pumps are capable of capacities ranging from low to medium, with flow rates peaking at 10,000+ gpm. In theory, reciprocating pumps can be manufactured to deliver more capacity, but they become prohibitively large and expensive at high flow rates. Both reciprocating and rotary pumps are capable of delivering product at extremely low flow rates (fractions of a gpm), making them particularly suitable for many chemical injection applications.Pressure Centrifugal pumps and rotary pumps are best suited for low to medium pressure applications. Reciprocating pumps are usually specified for high pressure service, with capabilities exceeding 100,000 psi. Multi-stage centrifugal pumps can deliver at pressures of 6,000+ psi and may be the most economical choice at this pressure in high capacity applications. But, in most applications exceeding 1,000 psig, reciprocating pumps are more suitable, particularly in low to medium capacity service. Both reciprocating and rotary pumps will continually increase pressure when pumping against a closed discharge to the extent allowed by the driver's horsepower. This can result in overpressure of the pump or piping components, so it is necessary to install a relief valve on the discharge of the pump capable of discharging the full capacity of the pump. A centrifugal pump's pressure rise is limited to the shut-off pressure on the pump curve, which is always less than the design pressure of the pump (and the piping system if properly designed). A relief valve is only needed if no other measures are provided to detect low flow conditions and shut down the pump to prevent damage. The relief valve need only be sized to pass the minimum flow rate required to maintain stable flow and prevent excessive temperature rise.Smooth or Pulsating Flow Centrifugal pumps and most rotary pumps provide smooth, non-pulsating flow, while reciprocating pumps produce a pulsating flow. A pulsating flow may require special design considerations in the piping system. If the pump is not located near the suction source, then acceleration head can contribute to low NPSHA problems, which may require the installation of a suction stabilizer. A pulsation dampener may need to be installed in the discharge piping to reduce pressure surges resulting from the pulsating flow.Variable or Constant Flow Centrifugal pumps operate on a variable-flow, variable-head curve. As the discharge pressure decreases, the pump delivers a higher flow rate. At any given speed, reciprocating and rotary pumps operate at a constant flow rate regardless of the discharge pressure. There are specific applications that require either constant flow or variable flow. Metering pumps rely on a constant flow at varying pressures, which makes reciprocating pumps and rotary pumps suitable for this application. Piston pumps used for metering will often use an adjustable stroke length to allow the operator to vary the flow rate to meet the system requirements. Centrifugal pumps are favored where process conditions often require varying flow rates. For example, a level control valve must throttle the flow rate from a vessel to maintain a constant level in the vessel. A centrifugal pump is well suited to handle this process condition, whereas a positive displacement pump would either require a continuous recycle to suction or a variable speed driver to accommodate the variable flow.Self-primingReciprocating and rotary pumps are self-priming. This is an important consideration where a prime cannot be maintained on the pump. Centrifugal pumps are not inherently self-priming, although some manufacturers do specially design self-priming units. External priming sources, such as an eductor or vacuum pump can also be employed.Costs and Space Considerations In an overlap region where the conditions are suitable to use a centrifugal, reciprocating or a rotary pump, the following rules generally apply: The reciprocating pump will generally have higher initial capital costs and will require more space relative to the centrifugal pump or the rotary pump. The reciprocating pump will generally have higher maintenance costs relative to the centrifugal pump or the rotary pump. The centrifugal pump will generally have higher annual power consumption costs relative to the reciprocating pump or the rotary pump because of lower efficiencies. Of course, there are many exceptions. These are just general guidelines. A pump that is selected for an application outside of its optimum operating parameters will almost certainly not follow these rules. For example, a rotary pump operating in a high pressure, abrasive-slurry service would probably have higher maintenance costs than a properly selected reciprocating pump. The close running clearances (particularly for high pressure service) required in the rotary pump would likely result in premature wear and frequent maintenance.Fluid Handling Centrifugal pumps are suitable for transferring a variety of fluids ranging from clean, clear non-abrasive fluids to abrasive-slurries. However, a centrifugal pump is not the best choice for pumping highly viscous fluids due to dramatic drops in efficiency at high viscosities. Centrifugal pumps are not normally specified for viscosities higher than about 4,000 SSU. Centrifugal pumps are also not well suited to pumping entrained air. Most centrifugal pumps can handle up to about 2% entrained gas and specially-designed pumps can handle up to about 10%.Reciprocating pumps are well suited for transferring clear, non-abrasive fluids, as well as abrasive slurries. In fact, the relatively low velocities of moving parts within a reciprocating pump make it particularly resistant to erosion in abrasive-slurry applications, provided that the pump is properly designed for the service. Reciprocating pumps maintain high efficiencies when pumping highly viscous fluids and can easily handle 50% and higher volumes of entrained gas.Rotary pumps can also handle high viscosity fluids and high volumes of entrained gas. In fact, many rotary pumps operate at their best efficiency at higher viscosities. However, rotary pumps are not well suited for pumping corrosive fluids or fluids with abrasive solids because of close clearances between rotating and static pump components.SummaryThe comparisons between different pump categories presented in this course are general. The information is intended to familiarize the student with some of the basic differences between centrifugal, reciprocating and rotary pumps. However, there are many different subcategories of pumps within these broad categories and there are many regions of overlap where multiple types of pumps in the same category and even in different categories would be suitable. Since every pump application is unique, each of the factors that influence the pump selection must be considered in detail.
Where we use positive displacement pumps?
A positive displacement pump causes a liquid or gas to move by trapping a fixed amount of fluid or gas and then forcing (displacing) that trapped volume into the discharge pipe. Positive displacement pumps can be further classified as either rotary-type (for example the rotary vane) or lobe pumps similar to oil pumps used in car engines.Moreover,these pumps give a non pulsating output or displacement unlike the reciprocating pumps and hence are called positive displacement pumps
What is reciprocating engines?
A reciprocating engine could be a number of things, now referring to a mechanical car engine for instance is not reciprocating.
What is the difference between screw chiller and reciprocating chillers?
screw is low maintenance than reciprocating reciprocating is more saving for power supply the compressors in screw is semehermatic but in reciprocating is open
