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  • Catastrophic Cargo Crane Slewing Ring Failure

    2014-12-10 · The failure of the crane’s slewing ring led to the crane body collapsing into the cargo hold. The jib fell across the main deck with the jib head resting just above the wharf and the crane cab sustained structural damage. Fortunately no one was injured other than the crane operator who escaped with a broken ankle.

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  • Fault analysis of slewing bearing – Slewing ring

    2020-3-19 · The common faults of tower crane slewing bearings mainly include abnormal sound, collapse after raceway corrosion and excessive amount of shaking when the slewing bearings rotate. 1 Failure cause analysis. There are two reasons that affect the normal operation of tower crane slewing bearings.

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  • Avoid slewing ring bearing failure with these six ...

    At a glance: six steps to save slewing ring bearings. More than 96% of slewing ring failure could be avoided by following simple maintenance tips. Grease regularly. Apply a liberal shot of extreme-pressure grease to the fittings around the bearing's circumference at intervals recommended in the operator's manual. Purge with grease.

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  • Slew Ring Bearing Failure Analysis - BEARING NEWS

    WORLD-WIDE TOWER CRANE ACCIDENT STATISTICS2000 - 2009. UK, Battersea - 2006 Tower crane slew-ring failure. ( 2 Dead ) Other Slew-ring Failures. Tower Crane Lightning Strikes! USA, 2007 Tower crane collaped during assembly. Video of accident scene 'VIEW HERE'. China, 2008 - Two tower cranes collapse due to Earthquake!

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  • tower crane incidents

    2019-3-18 · A failure of the slew ring bearing would result in an operational breakdown that could end in catastrophe. Other potential outcomes of crane failures include increased replacement and maintenance costs for your business. Luckily, there are several ways in which you can assess and prevent potential failures from occurring.

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  • slewing bearing condition monitoring - XZWD

    2019-10-27 · Since the bearing is so critical, careful maintenance is necessary. More than 96 percent of slewing ring bearing failures are due to surface-originated lubrication problems, contamination, overloading, and improper installation and mounting. These surface failures occur much earlier than classical fatigue failures and are less predictable.

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  • Crane Slewing Bearing Maintenance | SCIENCE PARK

    One of the most basic indicators of slewing ring bearing problems is the condition of the lubricant. If metal particles or flakes are apparent, some form of wear is taking place. Grinding, popping, or clicking noises from the bearing typically mean there is inadequate lubrication and/or excessive wear in the raceway.

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  • How to tell when a slewing ring bearing needs to be ...

    2019-6-18 · The marine crane turntable bearings in the course of work is very vulnerable to seawater and other external objects. In order to prevent seawater from causing premature failure of bearings, the sealing of the bearing uses a double-lip rubber sealing structure, and use stainless steel wire to clamp on the inner ring (Figure 4), the structure can effectively prevent the erosion of seawater, and make it …

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  • slewing bearing for marine crane – Slewing ring

    2020-3-10 · including those on masts, jibs and slew rings of their tower cranes, are correctly installed and pre-loaded (tensioned). Failure to do so could lead to the bolt connection failing, with catastrophic consequences. Those responsible for the installation, thorough examination, inspection, maintenance and operation of tower cranes should ensure that:

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  • Investigation: 110 - Structural failure of a cargo crane ...

    2016-5-19 · The crane was not overloaded at the time of the failure. The slew ring bearing failed following a prolonged period of progressive wear which went undetected at any statutory survey or examination. The extreme wear which led to the bearing failure was induced largely by an almost total absence of lubrication for the bearing.

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  • Tower crane - failure of loadbearing part | CROSS

    2014-10-1 · A tower crane suffered a failure of one of its four main legs approximately 12m below the slew ring. The fault was discovered, says the reporter, as a result of the tower crane operator noting some unusual banging and vibrations from what he believed to be the slewing ring (Figure 1).

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  • Causes and repairing methods of slewing rings in ...

    2021-4-15 · The mechanical failure is mainly the raceway wear formed between balls and slewing ring inner and outer rings. The raceway is composed of semi-circular grooves on slewing ring …

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  • Slew Ring Bearing Failure Analysis - BEARING NEWS

    2014-8-24 · Slew ring bearings are special types of bearings which are generally used in heavy machinery. The difference between these type of bearings and normal bearings is that, they have higher pitch value diameter, the way they are mounted on the structures, working nature which is generally “static”, higher load carrying capacity, and larger number of rolling elements.

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  • Slew Ring | Boltstress Ultrasonics

    2014-7-18 · A number of incidents have occurred recently involving failure of the slew bearings of ships’ cargo deck cranes, resulting in crane losses and serious injury to personnel.These failures have been caused by undetected excessive wear in the slew bearings.

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  • HSE Safety Alert - Preventing catastrophic failure of ...

    Slew Ring Slewing ring bearing bolts have a direct effect on bearing life, put simply if the bolt tension is incorrect or relaxes the bearing wear rate increases. We first became involved with these in 1995 on North Sea Offshore cranes.

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  • Condition monitoring for the safe operation and life ...

    2014-2-20 · HSE has identified that some tower crane users have not been releasing the slew brake and/or placing the jib at the correct out of service radius, when leaving cranes out of service and unattended. If luffing jib cranes are left out of service with the slew brake engaged and/or the jib parked at too small a radius, there is a possibility the ...

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  • MOM/OSHD/2020-10 06 NOVEMBER 2020

    Slew bearing condition monitoring. For the crane to pivot through a full 360 degrees of rotation about a central pedestal, the slew bearing provides the primary operational design requirements and sustains the full load of the crane, its payload and counterbalance. Many slew …

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  • Grease Analysis: Early Warning System for Failures and ...

    2020-11-17 · mast sections, slew ring, operator cabin, counter-jib, counter-weights, A-frame and jib sections. Erection Ropes 2.2.2 During the jib installation process, Erection Ropes are typically used to hold and balance the jib in position for the crane erectors to install and secure the jib onto the

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  • structural failure of a cargo crane on the vessel LODZ 2 ...

    2010-5-4 · The waterside workers on the wharf were watching the crane slew the load, to a position outboard of the ship™s side and about 3 or 4 m above the wharf, when they saw, what appeared to them to be, the jib ... structural failure of a cargo crane on the …

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  • Deck crane slew bearing tests_UWE Slewing bearing

    2019-12-24 · Deck crane slew bearing tests Date: 2014-07-18 16:28 A number of incidents have occurred recently involving failure of the slew bearings of ships’ cargo deck cranes, resulting in crane losses and serious injury to personnel.

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  • (PDF) Combined Failure Diagnosis of Slewing Bearings

    The practical combined failure signals of the 3 conditions were finally recognized and classified using SVMs. ... inner ring, rolling elements, and gear teeth of ... slew bearing signal de-noising ...

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  • A Review of Recent Tower Crane Accidents and the

    2021-1-5 · Crane had been in use for a number of weeks after erection Bolts in the joint below slew ring failed through fatigue Jib fell across site into an adjacent road Crane Driver + Member of public killed Slew ring bolts had been replaced in the air, shortly after erection Crane had been erected with too much counterweight Issues:-

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  • Check those bolts - Cranes Today

    2008-7-8 · The first thing I did when I got to the 450ft-high top of a 2003 tower crane was to check the slew-ring bolts with a 2lb beater using minimum force. There are two rows, each with 59 bolts. With the crane balanced off, I started with the top row (the slew bearing) and when I struck the third bolt it moved, showing it was loose.

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  • Preventing catastrophic failure of luffing jib tower ...

    2021-3-10 · HSE has identified that some tower crane users have not been releasing the slew brake and/or placing the jib at the correct out of service radius, when leaving cranes out of service and unattended. If luffing jib cranes are left out of service with the slew brake engaged and/or the jib parked at too small a radius, there is a possibility the ...

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  • Slewing Rings - Technical Handbook - BALNEX

    2012-1-17 · Slewing Ring Selection with Regard to Accuracy, Smooth Operation and Arrangement Rigidity Dimension and Operating Accuracy ... cer of large-sized bearings called slew - ing rings with a many ye ars tradition. The present production assortment con-tains more than 500 types of standard and special slewing rings.

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  • Slewing bearings - SKF

    2020-10-3 · c onsists of an inner ring (a), an outer ring (b) and rolling elements − balls (c) or cylindrical rollers − that are separated by polyamide spacers (d). The rings, one of which usually incorporates a gear (e), are provided with holes (f) to accommodate attachment bolts. The …

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  • Slewing bearings | SKF

    Slewing bearings comprise an inner ring and an outer ring, one of which usually incorporates a gear. Together with attachment holes in both rings, they enable an optimized power transmission with a simple and quick connection between adjacent machine components.

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  • Grease Analysis: Early Warning System for Failures and ...

    2021-5-22 · To take a grease sample, remove the inspection screw on a slew bearing or take off the grease nipple from a rolling-element bearing. Cut the sampling tube in a length that is appropriate to enter the bearing and reach an area for taking a meaningful sample. ... Keep in mind that a failure investigation after damage has occurred often requires a ...

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  • A Review of Recent Tower Crane Accidents and the

    2021-3-5 · Crane had been in use for a number of weeks after erection Bolts in the joint below slew ring failed through fatigue Jib fell across site into an adjacent road Crane Driver + Member of public killed Slew ring bolts had been replaced in the air, shortly after erection Crane had been erected with too much counterweight Issues:-

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  • structural failure of a cargo crane on the vessel LODZ 2 ...

    2010-5-4 · The waterside workers on the wharf were watching the crane slew the load, to a position outboard of the ship™s side and about 3 or 4 m above the wharf, when they saw, what appeared to them to be, the jib ... structural failure of a cargo crane on the …

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  • Fatalities caused by crane collapse following metal ...

    2016-5-6 · The crane fell onto a member of the public, killing him also. Sections of the tower crane separated when 24 bolts failed due to metal fatigue. The 24 bolts were a significant safety feature on the crane’s slew ring, which connected the mast (tower) to the slew turret. This allows the arms of the crane (jib) to rotate through 360 degrees.

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  • HSBEIL | Tower crane collapse events - risk management

    2019-8-27 · to failure. This is a particular risk during winter months. Risk management: Health & ... places the crane in free slew. The risk of tower crane collapse events can increase due to associated adverse ... condition of the slew drive motors, gearboxes and slew ring bearing have

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  • Preventing catastrophic failure of luffing jib tower ...

    2021-3-10 · HSE has identified that some tower crane users have not been releasing the slew brake and/or placing the jib at the correct out of service radius, when leaving cranes out of service and unattended. If luffing jib cranes are left out of service with the slew brake engaged and/or the jib parked at too small a radius, there is a possibility the ...

    Get Price
  • Guide to inspecting and maintaining cranes

    2020-3-30 · intervals, according to the crane manufacturer’s instructions. Where there is documented evidence that inspection and testing has been carried out . on certain items, for example slew ring bolts, drive systems and braking systems, within a reasonable preceding period (as determined by a competent person) the item may

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  • Marine Technical Library - marengine.com

    Deck crane collapsed due to a catastrophic failure of the slew ring bearing. Departmental investigation into the structural failure of a cargo crane on the vessel LODZ 2 in the port of Melbourne. Download: Catastrophic failure of a capacitor and explosion in an 11kV harmonic filter on board the passenger cruise vessel RMS Queen Mary 2. Download

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  • Crane Safety Assessment Findings, Results, and

    2016-10-18 · Crane inspections may be conducted by a USCG marine inspector or by one of two authorized third-party inspectors. On April 25, 2014, BSEE initiated the Crane Safety Assessment. The study involved analysis of cranes and ... identify failure event data, trends and key issues that could be addressed in the development of an

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  • How to conduct a rocking test of the crane?

    What is the crane rocking test procedure? rocking_test crane. 16 Apr '18, 02:25. April 16, 2018, 2:25 a.m. KnowledgeBase. Answer: The slewing bearing rocking test should be done periodically for the bearing wear tracking and early failure detection. The measurement could …

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  • Section 3 Offshore cranes

    2021-2-11 · 3.7.5 The ring is also to be considered with respect to fatigue loading based on load combination Case 2 of Ch 4, 2.15 Load combinations 2.15.1, multiplied by a load spectrum factor of 0,7 and associated with an allowable stress determined from S-N curves obtained from the type testing of Ch 4, 3.7 Slew rings 3.7.3 on the basis of 2 x 10 6 ...

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  • Learning Report - MOM

    2020-11-4 · mast sections, slew ring, operator cabin, counter-jib, counter-weights, A-frame and jib sections. Erection Ropes 2.2.2 During the jib installation process, Erection Ropes are typically used to hold and balance the jib in position for the crane erectors to install and secure the jib onto the

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  • Casualty Investigation Report CA 094 CEC PACIFIC

    2017-6-20 · Damage to slew gear showing area through which bearings had torn Damage to slew gear showing bent slewing gear (b) 2.28 The crane sheared off the pedestal at the slew ring (see images above). Investigation of the incident demonstrated that this was the single point of failure on the crane. The driver was able to exit the cab

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  • MOM/OSHD/2020-10 06 NOVEMBER 2020

    2020-11-17 · mast sections, slew ring, operator cabin, counter-jib, counter-weights, A-frame and jib sections. Erection Ropes 2.2.2 During the jib installation process, Erection Ropes are typically used to hold and balance the jib in position for the crane erectors to install and secure the jib onto the

    Get Price
  • Preventing catastrophic failure of luffing jib tower ...

    2021-3-10 · HSE has identified that some tower crane users have not been releasing the slew brake and/or placing the jib at the correct out of service radius, when leaving cranes out of service and unattended. If luffing jib cranes are left out of service with the slew brake engaged and/or the jib parked at too small a radius, there is a possibility the ...

    Get Price
  • Lifter borer boom failure | WorkSafe.qld.gov.au

    The major inspection should include dismantling of the boom, pins, slew ring and outriggers along with comprehensive inspection of all high stress areas. This is consistent with the information provided in the Mobile Crane Code of Practice 2006 (PDF, 1.34 MB) for major inspections on mobile cranes.

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  • Slewing and non slewing cranes - XZWD - slew

    2018-3-1 · Slewing and non slewing cranes, XZWD. A slewing bearing is a rotational rolling-element bearing or plain bearing that typically supports a heavy but slow-turning or slow-oscillating load, often a horizontal platform such as a conventional crane, a swing yarder, or the wind-facing platform of a horizontal-axis windmill.. Slewing bearing is called the joint of machine, which is used to connect ...

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  • Battersea crane verdict | Vertikal.net

    2012-3-13 · The overloading was due to an incorrect manual being used in the erection of the crane. On the 25th July 2006, four inner slew ring bolts failed and all of the slew ring bolts were replaced. No investigation was undertaken as to the root cause of the bolt failure. On the 26th July 2006 the crane was returned to service.”

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  • Marine Technical Library - marengine.com

    Deck crane collapsed due to a catastrophic failure of the slew ring bearing. Departmental investigation into the structural failure of a cargo crane on the vessel LODZ 2 in the port of Melbourne. Download: Catastrophic failure of a capacitor and explosion in an 11kV harmonic filter on board the passenger cruise vessel RMS Queen Mary 2. Download

    Get Price
  • crane service Archives - Rub bbq Company

    Slew ring is generally designed for lifting equipment that requires rotation. They are usually found in cranes, excavators, shovels, tunnel boring machines, and bucket trucks on bearings and gears. If they are not maintained properly they can lead to premature failure.

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  • Construction, Working and Maintenance of Stackers and ...

    2019-3-16 · 5 Replacement of Slew Bearing 40 6 Repair of Slew Gear 42 - References 46 . 3 Construction, ... In this method, a ring-shaped pile is being continuously stacked at one end and reclaimed at the other. Stacking takes place in a fan shaped arc, typically 120°. With each sweeping movement, corresponding to two layers of material, the whole sector ...

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