Mechanical overspeed trip device turbine

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A turbine trip is the emergency shutdown of a power-generation turbine due to unexpected events. Due to the number of issues that may cause a trip, they are relatively common events. Although it can occur on any such turbine, the term is most often seen in the field of nuclear power. Many events can cause a turbine trip, including: Apr 27, 2013 · As I have already mentioned the trip oil is used to overcome the spring action of emergency stop valve. At our unit when the trip oil pr. is less than 4 kg it will trip the turbine. normally the trip oil pressure is 8 kg when TG is running. for the oil supply to turbine we have one pump. there is one standby pump in case previous one fails. Petroleum refineries and chemical plants utilize general purpose API 611 steam turbines to drive mechanical loads such as pumps, fans, blowers and compressors. Many of these turbines have obsolete and unreliable mechanical overspeed trip devices that pose safety risks to the facility and its personnel. 5. A turbine provided with an overspeed trip device according to claim 1. References Cited in the file of this patent UNITED STATES PATENTS 606,877 Reynolds July 5, 1898 1,623,822 Wilkinson Apr. 5, 1927 1,925,846 Parkhill Sept. 5, 1933 2,926,899 Gaubatz Mar. 1, 1960 Dec 14, 2018 · Helooo friends in this video we explain what is overspeed protections of steam turbine & how many overspeed trip device used in turbine.Also explain mechanical and electronic overspeed trip device ... Oct 19, 1971 · Turbine control system with conventional overspeed trip for stop valves and governor for control valves includes an additional trip device which temporarily closes stop valves to anticipate overspeed tripping, but reopens them to prevent permanent tripping if the governor functions to bring overspeed under control. mechanical trip valve=s incoming and outgoing paths for hydraulic fluid are controlled by the position of an internal spool, which in turn is controlled through mechanical linkages by the overspeed trip device, the manual trip lever, and the mechanical trip solenoid. The overspeed trip device is an unbalanced ring attached to the turbine shaft; the Dec 17, 2018 · Helooo friends in this video we explain working principle of mechanical overspeed trip device & also explain where overspeed trip device installed in turbine. We hope this video will be help you ... The overspeed trip is the final protection against catastrophic failure of the turbine following a load rejection, causing the unit to become disconnected from the power system. Additionally, an overspeed may be caused by a governor failure on an unsynchronised turbine causing an excessive steam demand. Mechanical Overspeed Trip Electronic Overspeed Protection System Woodward’s ProTechTPS (Total Protection System) is a safety system that provides specialized over- speed protection functions plus additional programmable logic to address other safety critical func- tions. Denny Younie Sales and Marketing Manager 970-443-4098 [email protected] PROJECT OVERVIEW: GCS was contracted to provide new control system and overspeed protection on all refinery API612 (Steam Turbines Special-Purpose Application) classified rotating equipment. The new system needed to be SIL3 compliant and 2oo3 voted, so the mechanical overspeed trip device could be eliminated. Oct 19, 1971 · Turbine control system with conventional overspeed trip for stop valves and governor for control valves includes an additional trip device which temporarily closes stop valves to anticipate overspeed tripping, but reopens them to prevent permanent tripping if the governor functions to bring overspeed under control. A turbine overspeed event can lead to catastrophic failures that may generate unanticipated, uncontained liberation of turbine blades and components, release high pressure and temperature steam, and result in secondary damage including process piping damage, chemical release, fires, and missile damage. Oct 19, 1971 · Turbine control system with conventional overspeed trip for stop valves and governor for control valves includes an additional trip device which temporarily closes stop valves to anticipate overspeed tripping, but reopens them to prevent permanent tripping if the governor functions to bring overspeed under control. Designed for steam turbines with mechanical overspeed trip systems, Elliott's remote trip solenoid modification improves safety by providing turbine operators with the ability to trip the turbine remotely from an electronic device or control room. It also can be used for process-related trips. proper operation of mechanical overspeed bolts. Testing of the overspeed bolt consists of running the turbine up to the trip point (typically 112% of rated speed); h owever this is a risky operation for several reasons. First, there is no guarantee that the turbine will actually trip at 112% until the testing has been completed. Apr 27, 2013 · As I have already mentioned the trip oil is used to overcome the spring action of emergency stop valve. At our unit when the trip oil pr. is less than 4 kg it will trip the turbine. normally the trip oil pressure is 8 kg when TG is running. for the oil supply to turbine we have one pump. there is one standby pump in case previous one fails. rack and trip valve. The overspeed trip device is critical to the safety of the turbine. Without the overspeed protection, the turbine would run to destruc-tion when the load (compressor, pump, or generator) was lost. How fast the turbine accelerates determines how fast the overspeed trip system must respond (refer to Figure 10). If the turbine valves change their position instantaneously, this measure- Nov 26, 2019 · The electronic protection system monitors three individual magnetic pickups to provide overspeed protection. This system replaces mechanical over speed devices, especially in high speed applications, such as steam or gas turbines having speed more than 10000 rpm, where mechanical over speed devices are less reliable. Most new turbines today are equipped with Electronic Overspeed Protection as a standard. Very few are supplied with a mechanical bolt. It is not necessary to test the overspeed system by running the turbine up to the set point trip speed (typically 110% speed). Nov 26, 2019 · The electronic protection system monitors three individual magnetic pickups to provide overspeed protection. This system replaces mechanical over speed devices, especially in high speed applications, such as steam or gas turbines having speed more than 10000 rpm, where mechanical over speed devices are less reliable. Mechanical overspeed systems on turbines rely on an equilibrium between the centripetal force of the rotating shaft imparted on a weight attached to the end of a turbine blade. At the specified trip point, this weight makes physical contact with a lever that releases the trip oil header, which directly moves a trip bolt and/or a hydraulic ... Sep 22, 2017 · - A signal from the generator trip could not trip the turbine. - An overspeed trip could not function as the logic required (3) relay actions that relied upon the 24V DC power supplied via the AC UPS system. • The turbine overspeed protective scheme was incorporated in the turbine controls and not as a separate, independent system. Unless it is an electronic governor on the turbine, there is a mechanical overspeed trip device which closes the trip valve (or trip throttle valve [TTV] on small turbines). The mechanical bolt on a turbine refers to the mechanical tripping device for turbine overspeed conditions. Typically it is a mechanical “finger” held by a spring in the turbine rotor. As the speed of the turbine increases, the centrifugal force causes the “bolt” to extend further from the centerline of the rotor. Section 1.1 of API 616 does allow a vendor to offer alternative designs. Therefore, an overspeed trip setting higher than 5% may be acceptable. However, please be certain that the turbine is designed for an appropriate maximum speed. For example, a turbine with an overspeed trip setting of 110% may need to be designed for a maximum speed of 120%. Mechanical Overspeed Trip Electronic Overspeed Protection System Woodward’s ProTechTPS (Total Protection System) is a safety system that provides specialized over- speed protection functions plus additional programmable logic to address other safety critical func- tions. Denny Younie Sales and Marketing Manager 970-443-4098 [email protected] Nov 16, 2016 · Turbine overspeed events lead to costly and dangerous catastrophic failures. Therefore the overspeed system has to be periodically tested to ensure the system has the adequate response time to protect the turbines, plants and personnel. Mechanical Overspeed Trip Electronic Overspeed Protection System Woodward’s ProTechTPS (Total Protection System) is a safety system that provides specialized over- speed protection functions plus additional programmable logic to address other safety critical func- tions. Denny Younie Sales and Marketing Manager 970-443-4098 [email protected] Sep 22, 2017 · overspeed failure. •The mechanical trip device is not precise and trip initiation speed can vary. Worn components, debris on operating cylinders can impact the speed at which the unit trips. This often results in multiple tests as the spring is adjusted to obtain the correct setting. •The only way to accurately test mechanical trip systems is to increase turbine speed to trip speed. May 22, 2015 · Information Notice No. 86-14: PWR Auxiliary Feedwater Pump Turbine Control Problems SSINS No: 6835 IN 86-14 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, DC 20555 March 10, 1986 Information Notice No. NO 86-14: PWR AUXILIARY FEEDWATER PUMP TURBINE CONTROL PROBLEMS Addressees: All nuclear power reactor facilities holding an operating license (OL ... The overspeed trip test consisted of allowing the turbine to accelerate to a maximum rpm speed to test a mechanical shutoff valve. The mechanical shutoff valve was designed to cut off the flow of steam to the turbine at the maximum rpm and thereby prevent the turbine from accelerating to a dangerous speed. May 22, 2015 · Information Notice No. 86-14: PWR Auxiliary Feedwater Pump Turbine Control Problems SSINS No: 6835 IN 86-14 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, DC 20555 March 10, 1986 Information Notice No. NO 86-14: PWR AUXILIARY FEEDWATER PUMP TURBINE CONTROL PROBLEMS Addressees: All nuclear power reactor facilities holding an operating license (OL ... uncontrolled turbine, assessing all of them is difficult. Design ideas of the trip systems for the many turbine manufacturers are varied and span many years. Frequently, the causes of an overspeed disaster are not fully understood even after an exhaustive study is completed. Little hard data are available because things happen very fast.