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How the critical speed of ball mill is determined?
The critical speed of a ball mill is determined by the rotation speed of the mill and the diameter of the grinding media. It is calculated using the formula: critical speed = 42.3/sqrt(d), where d is the diameter of the mill in meters. Operating above the critical speed can lead to cascading and ineffective grinding, while operating below can lead to cataracting and unproductive milling.
Defn of critical or whirling speed?
Critical speed, also known as whirling speed, refers to the rotational speed at which a system becomes dynamically unstable, leading to vibration and potential failure. This can occur in rotating machinery or structures when the natural frequency of the system matches the excitation frequency. It is important to avoid operating equipment near its critical speed to prevent structural damage and maintain operational safety.
Derivation of critical speed of grinding mill?
The critical speed of a grinding mill is the speed at which the centrifugal forces equal gravitational forces at the mill shell's inner surface, leading to no ball fall and higher efficiency. It is calculated by using the formula: critical speed = 42.3/sqrt(D-d), where D is the diameter of the mill in meters and d is the diameter of the grinding media in meters.
State the critical speed ranges should passed through as quickly as possible?
Critical speed ranges should be passed through quickly to minimize the risk of resonance and potential damage to the system. It is important to accelerate or decelerate through these ranges efficiently to maintain stability and prevent harmful vibrations. Smooth and controlled transitions through critical speed ranges help ensure the safety and integrity of the equipment.
How the critical speed of a roll is calculated?
The critical speed of a roll is calculated using the formula: Critical Speed = (g / (2 * pi)) * sqrt(T / m), where g is the acceleration due to gravity, pi is a mathematical constant, T is the torque applied to the roll, and m is the mass of the roll. This formula helps determine the speed at which resonance occurs in rotating machinery, beyond which the roll may experience instability or failure.
Why is RPM speed so important to the life of a compressor?
Why is RPM (speed) so important to the life of a compressor
What does CSR mean on a compressor?
CSR on a compressor typically stands for "Constant Speed Ratio." It refers to the operating condition where the compressor maintains a consistent speed relative to other components in a system, ensuring optimal performance and efficiency. This concept is crucial in applications where maintaining a steady output is necessary for overall system stability.
Why you balance air compressor rotor of gas turbine at 1350 rpm where as its field rpm are15000?
If your compressor is running above its first or second critical (very likely) then you shoud balance it at its operating speed. You need to do a high speed balance. If you can only do this in situ (i.e not in the workshop) then you can use VibroNurse balancing software which is easy to use and free.
Are the mounting bracket dimensions and location important in automotive compressor application?
critical
Is it safe to use the unit even if your compressor is over heat?
Compressors have a thermal overload built inside that will shut down the compressor if the conditions are critical.
What is mean by Critical speed of the shaft?
Critical speed of a shaft refers to the rotational speed at which the system's natural frequency coincides with the shaft’s rotational frequency, leading to resonance. At this speed, vibrations can increase significantly, potentially causing mechanical failure or excessive wear. It's crucial in engineering to avoid operating machinery at or near this speed to ensure stability and longevity. Engineers often calculate critical speed to design shafts that operate safely and efficiently within specified limits.
What is the best type of valve to use for anti surge control on a compressor... linear or equal percentage?
For compressor applications with critical valve outflow it is linear, and possibly equal percentage. Applications with sub-critical outflow need more analysis.
What are some examples of real life hyperbola?
The orbit of objects that approach the Sun, or Earth, from far away, above a certain critical speed.At a certain critical speed, the orbit will be a parabola. Above the critical speed, the orbit will be a hyperbola. (In both cases, the object will go away, never to come back.) Below the critical speed, the orbit is an elipse or a circle.The orbit of objects that approach the Sun, or Earth, from far away, above a certain critical speed.At a certain critical speed, the orbit will be a parabola. Above the critical speed, the orbit will be a hyperbola. (In both cases, the object will go away, never to come back.) Below the critical speed, the orbit is an elipse or a circle.The orbit of objects that approach the Sun, or Earth, from far away, above a certain critical speed.At a certain critical speed, the orbit will be a parabola. Above the critical speed, the orbit will be a hyperbola. (In both cases, the object will go away, never to come back.) Below the critical speed, the orbit is an elipse or a circle.The orbit of objects that approach the Sun, or Earth, from far away, above a certain critical speed.At a certain critical speed, the orbit will be a parabola. Above the critical speed, the orbit will be a hyperbola. (In both cases, the object will go away, never to come back.) Below the critical speed, the orbit is an elipse or a circle.
What is derivation of critical speed?
Critical speed is the speed in RPM at which a rotating machine will destroy itself by all harmonic vibrations coinciding at maximum vibration.
Types of piping?
piping critical , non critical critical piping : where temperature ,pressure are high and sizes of pipe are big and piping connected to critical equipment( such pump,turbine compressor etc) non critical : other than criti
Why variable speed compressor motors are more efficient than single speed motors in heat pump system?
This type of compressor uses a special drive to control The speed of the unit. Also, saves more energy than a fixed speed equivalent.
What is compressor turndown?
Turndown: The allowable operating range for the centrifugal compressor between the design point and the surge line at any given speed for a fixed compressor head.
