Pressure difference across the compressor casing can cause reverse rotation of complete train, while drive steam turbine is in shutdown condition. Regarding the motors, there could be a difference in size due to the speed required or the starting torque required. Reverse rotation of a compressor and its drive train during turning gear mode can cause major damage. It is a basic dimension from which many other features of. This book is very useful for learning about gears and gearing. Page 20 additional service information is available in the detroit diesel series 60 service manual, 6se483. How does the steam turbine gland sealing system work. Gearbox typical failure modes, detection, and mitigation methods presentation, nrel national renewable energy laboratory. This comes via the excellent gsi guitar salon international, thanks. It is a planetary gearset and functions like a cross between a needle. Introduction to gear design chapter 2 what kind of gears should i use.
Hydraulic turning gears for gas and steam turbines. A gear is attached to one end of the shaft and is moved axially in a first. Fundamentals, theory, and design pdf free download. Successful gear systems often depend as much on selecting the right gear for the job as on the proper design of the individual parts. Homophones have similar pronunciations but different meanings. The barring device motor works only while one of the push buttons is pressed.
Classical guitar method book free pdf free classical guitar lessons. Mill barring gear and braking system, it is widely used for the cement, set for barring gear, inching device for ball mill. Turbine was coming on to turning gear after hot tripping but, every time when people. This causes the ring gear to rotate in a direction opposite that of the sun. The invention relates to turning gear system for a turbine.
The barringtuning gear was running after that jammed. Steam turbines startups 171 prior to switching on the turning gear, oil system is started up. The drive shaft must be clean and free of all oil before installation. Learn the translation for barring in leo s english. The trouble with 3d printing a ball bearing is that spheres dont adhere to the 45 degree rule, so they tend to print poorly, or if metal balls are used instead, then the bearing requires assembly. Failure to make certain the drive shaft is free of oil can result in the drive gear. Control of lube oil pressure and temperature, as well as rotor axial displacement and eccentricity is necessary. However it is always true that turbine should be on barring gear. Metallurgical contentball mill maintenance manualon mill installation and maintenanceball mill concrete foundationsgrinding mill foundationgroutingball mill sole plate am sure your ball mill is considered the finest possible grinding mill available. It can be difficult to even remember all the meanings of bearing, let alone whether or not it overlaps with the meanings of other words like baring continue reading to learn the difference in meaning. Turning gear engagement device general electric company. Selecting inching drives for mill and kiln applications. This is a new kind of bearing that can only be manufactured by 3d printing and comes preassembled. On completion of this short tutorial you should be able to do the following.
Turning gear an operation point of view free download as powerpoint presentation. Detroit diesel series 60 service manual pdf download. Gear bearings consist of a number of smaller satellite gears which revolve around the center of the bearing along a track on the outsides of the internal and satellite gears, and on the inside of. Selecting inching drives for mill and kiln applications glen cahala frank c uherek, principal engineer gear engineering software development abstract the inching drive, also known as a barring or auxiliary drive, is an important component of any mill or kiln installation. Steam turbines startups 1 principles of steam turbines startups. Scott morris gives a lesson on barring technique the barre. The number of teeth for spur gears is given by where k 1f fll1 for fulld tht th08f tbt th d ldepth teeth, 0. Adventures in faith and doubt page 90 these woods loom large in my history they were the site of two clumsy first kisses, one heartcrushing breakup, and countless whispered barings of the soul but they are even more solidly a part of my present. Each mill engine manufacturer had their own style of barring engine. Approval issue course 234 turbine and auxiliaries module nine operation to achieve these two objectives, the turning gearis started early during unit startup such that the turbine generator can spend enough time on turning gear. This is not only true for steam turbines, but diesel engines too. The teeth enable one gear to drive another, that is, to transmit rotation from one gear to the other. Around 18811883 there was a shift to the use of steampowered barring engines.
By allowing both the planet carrier and the ring gear to rotate, a differential gear drive is produced, the output speed of one. It is likely, if a unit needs barring, that this would also be suitable for. The inching drive, also known as a barring or auxiliary drive, is an important component of any. When maintenance is finished, the stopped barring gear must be moved back in the turn wheel free position, which is displayed on the dcs system.
A controller supplies the forward and reverse signals. Damage from reverse rotation of compressor during shutdown. Two homophones, bearing and baring, are even more confusing than most others, since bearing has so many definitions. The inner casing is axially split and supporting so as to be free to move in. Gearbox typical failure modes, detection and mitigation. Barring strong headwinds, the plane will arrive on schedule. Pullers free delivery possible on eligible purchases. Case 1 cold start turbine starting in cold condition rotor is big enough in length and is supported at t. The subject barring device includes a shaft adapted for both axial and rotational movement. As such you will find it is designed and constructed according to heavy duty specifications. Why is it necessary to ensure that turbine is on barring. The gear tooth is a component of a mechanical power transmission system that does not lack for descriptive terminology.
It is located at ip lp pedestal hydraulic jacking device. If turbine is not rolled on barring gear, the upper part of rotor will be subjected to. Gearbox typical failure modes, detection and mitigation methods. The next revision to this manual will include the revised information. Turbine preparation to startup begins with barring the rotor by the turning gear. Mill barring gear and braking system barring gear model with motor baseplate and braking system for ball mills request quotation. Solid mechanics tutorial gear systems this work covers elements of the syllabus for the edexcel module 21722p hncd mechanical principles outcome 3. It is always necessary to check whether lube oil pumps has started and whether all bearings are supplied with oil. Download pdf magazines and ebook free usa, uk, australia. Known barring devices have been used to rotate crankshafts of engines and adding features to these known devices increases the complexity and cost of such devices.
Both bearing and gear failures are concentrated in the parallel section. A gear bearing is a type of rollingelement bearing similar to an epicyclic gear. A gear set or gear cluster is a collection of gears of different sizes, with each tooth on any gear having exactly the same profile as every other tooth and each gap between the teeth being just sized to mesh. What may have happened to a steam turbine if its rotor shaft seizes. Central or girth gear drive for ball mills 1 scribd. Barring gear has to be engaged and disengaged tofrom a turning unit and needs a more complicated mechanism and electric control usually automatic. Khk offers for free the gear technical data book in pdf format. The turning gear operates as teeth gear, driven by an electrical electrical turning. Barring gear causes and prevention pdf free download. House passes bill barring government from buying huawei gear. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality. Barring gear motor and turning gear motor cr4 discussion. Barring gear or turning gear is the mechanism provided to rotate the turbine generator shaft at a very low speed after unit stoppages.
In a case study, steam turbine barring wheel was damaged in a wet gas compressor unit at a coker unit of. The pitch circle is a circle on the face of a gear that passes through points that are radially half way up the working depth of the teeth. Verify cylinder number 1 is at top dead center by barring the engine over slowly while pushing in on the top dead center pin. Turning gear or ratchet operation after shutdown and before startingrestarting is a. Crack open the steam supply isolating valve and warm up the. The final drive has a constant gear reduction ratio or a differential gear ratio. Covers workshop procedures for the detroit mbe 4000 epa07 diesel engine, including complete disassembly and assembly with oem specs and torque data. By barring gear, if you mean, turning gear then yes prior to starting any high power machinery you have to check its operation at a noload condition. An interlock ensures that the baring gear cant be started bearing oil pressure are established.
There are two cases of particularly which this condition must be filled. The smallest number of teeth on a spur pinion and gear, onetoone gear ratio, which can exist without interference is np. The barring engine needed to turn these rope drives over as well although they were disconnected from the machinery at the remote end and a simple manual gear was no longer sufficient. The system comprises a pinion configured and arranged to engage a turning gear so as to turn a shaft of the turbine and further includes a higher pressure oil system having a hydraulic motor and a lower pressure oil system having a hydraulic pump coupled to the hydraulic motor so as to enable a generation of. Gears can be made in a wide variety of forms, each with its own strengths and weaknesses. A turning gear apparatus mounted adjacent the bull gear of a large turbomachine rotor has a carriage pivotably mounted to the frame, a first. The common practice of requiring direct drive nonreducing in the gearbox to be in the highest gear determines this ratio. If the mating gear has more teeth than the pinion, that is. A turning gear is used to rotate a turbine rotor under conditions where it. With nounverb tables for the different cases and tenses links to audio pronunciation and relevant forum discussions free vocabulary trainer. In this lesson scott addresses the topic of barring when and how to bar, and also when to use a half bar or not to bar at all. Detroit mbe 4000 epa07 engine service manual latest. It is used for maintenance and inspection purposes, as. Looking for downloadable 3d printing models, designs, and cad files.
This downloadable pdf manual is the latest edition available 2018. Page 14 16 general information before servicing direction of engine rotation when rotating the crankshaft by hand, the free play amount of rotating direction will affect the adjustment. An electric motor is coupled to the drive shaft of the barring device and incrementally rotates the drive shaft in response to forward and reverse signals. An engine barring system is disclosed that includes a barring device having a drive shaft manually engageable with the flywheel of an engine to rotate the engine crankshaft. Barring definition of barring by the free dictionary. Manual turning gear function the turbine generator is equipped with a mechanical barring gear, which enables the combined shaft system to be rotated manually in the event of a failure of the normal hydraulic turning gear.
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