introduction A main reason for high vibration and failure in machinery is the misalignment between driver and driven which is an interested topic among repair and maintenance experts. To reach the high speeds with low vibration amplitude, the first regarded issue is the balancing and alignment. Underestimation of balance and alignment, especially in high speed…
introduction Pumps are used for increasing the liquid pressure. Mechanical energy in pumps is taken from a foreign source and given to the fluid. However fluid energy is increased after leaving the pump. Pumps are divided into two categories according to the way of transmitting energy: 1. Dynamic pumps: In which energy transferring to fluid…
introduction Compressors play important role in industries such as petroleum, oil and gas and … as the heart of the plant. These machines are driven by electric motors or turbines either steam or gas. Compressors are used for compressing the gases fluids. Compressors which are used for compressing fluids are knows as pumps. In some…
introduction Steam turbines are of the most ancient equipment played important role in different industries. Produced force due to impacting steam molecules to rotor impeller, causes rotation of the rotor. In fact, steam turbine is a device which transforms heating & pressure energy to mechanical. There are some restrictions with steam turbines such as difficult…
introduction Industrial valves are used in many cases in most industries. In fact one of the most important topics in piping is the introduction, utilization and function of industrial valves. Industrial valves are categorized in multiple methods. One of these methods is according to the valves function as following: 1- On-Off Valves 2- Throttle Valves…
Introduction Vibration analysis is one of the most effective methods in condition monitoring. Many of faults and defects can be distinguished using vibration analysis technique. Knowing the machine geometry, specifying the measuring points, frequency range setting, and having technical knowledge for diagnostics are of the most important parameters in machinery fault detection. Many of faults…
introduction Condition monitoring is growing coincident with growing industries. Electrical motors are the most common machines which are used in different industries. So monitoring of these machines can be effective enough in decreasing maintenance expenditures. The most common electromotors used in different industries are squirrel cage induction electromotors. In the last two decades, different diagnostics…
introduction Gears are of the most common power transmitter in industries. Due to the issues which may be resulted from shocks and stresses in gearboxes, these equipment are exposed to special failures. In some cases too many gears are used in a gearbox which cannot be diagnosed easily. A vibration analyst needs to know about…
introduction Bearings are parts of equipment through which all produced forces in machinery passed. Therefore bearings are the first parts in machinery that are exposed to failures. Theoretically, a bearing has a life time of 100 years but practically this period reduced to 10 years in the best condition. To achieve this period, it’s necessary…
introduction Unbalanced rotor is one of the main reasons of vibration in rotating machinery. In order to achieve the minimum amplitude of vibration, the amount of unbalance weight should approaches to the minimum. Balancing is one of those activities which has to be done on the rotor or any other rotary parts before the assembly…