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  • Slewing Rings - Technical Handbook - BALNEX

    2012-1-17 · pe and size of the slewing ring and to solve the arrangement including optimization of the connecting part design and instructions for maintenance. Selection of Slewing Ring Type and Size For a decision about size and design of the slewing ring it is necessary to know following data: • size, direction and time behaviour of the operating load

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  • Slew Bolt Inspection (including non-destructive testing ...

    2019-9-6 · Replacement of sealing device. Fixed bolt inspection. Bolt. Bolt connection is of great significance to the running safety and using life of slewing bearing, so it is necessary to tighten the bolt regularly. If the bolt is not in good condition, it must be replaced. Our service. Check initial stress of bolt.

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  • Inspection and Maintenance of slewing bearing – Slewing ...

    2020-10-22 · applied to the bolt. This inspection shall be repeated annually at a minimum. If a loose bolt is discovered, replace the bolt and mating washer with new ones. The running condition of the slew bearing equipment should be evaluated during use. If excessive noise and vibration are observed, the equipment should be shut down for inspection

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  • Slew Bearing Installation and Maintenance Manual

    2020-3-10 · Regular inspection and examination of bolt connections 8. High tensile connections are regularly inspected by a competent person to check that pre-load on the bolts has not been reduced. Loss of pre-load can result in movement of the joint under load. The frequency of inspection should be in accordance with the manufacturer’s instructions.

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  • HSE Safety alert on high tensile bolt connection on tower ...

    2020-3-30 · Bolts to be tested should be selected from the slew ring by a competent person. Complete removal of the bolts from the slew ring and use of magnetic particle testing is recommended. If cracks are detected, bolts should be discarded and replaced with new bolts.

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  • 05. Guide to Inspecting and Maintaining Cranes

    Energy Bolting is a special bolting supplier with a focus on high tensile, performance critical, fully tested and certified slew ring fasteners and crane bolting. ISO 898-1 Grade 8.8, ISO 898-1 Grade 10.9, ISO 898-1 Grade 12.9

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  • Slewing Ring Bolts & Special Lifting Fasteners -Energy Bolting

    When BTS was commissioned to service the slew ring bearings, they discovered faults in the previous techniques implemented for testing the bolts. They began with a full assessment of the bolts. Upon observing the issues present, they recommended a technologically-advanced means of servicing designed to: Improve the bearing accuracy and lifespan

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  • Slew Ring | Boltstress Ultrasonics

    2020-3-30 · 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 not have to be stripped down in the major inspection. The competent person should still

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  • Guide to inspecting and maintaining cranes

    2021-1-4 · During these inspections, the bearing clearance is measured, grease is taken for a ferrography analysis and, in the case of Class ABS, that slewing bearing bolts are NDT tested. Without accurate slewing bearing inspections, the classification may not be completed, and more wear may have occurred than the tests revealed.

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  • Thorough examinations and inspections of lifting equipment ...

    2021-2-27 · Further recommendations on inspection relating to cranes are given in BS 7121 British Standard Code of Practice for the Safe Use of Cranes. The various parts of this standard can be obtained from BSI. Lifting accessories do not normally need formal inspection, provided that proper pre-use checks are made and they undergo their standard thorough ...

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  • Slew Drive Installation and Maintenance Manual

    2020-10-22 · Thread the bolts and washers, if required, into the slew drive, hand tightening each bolt. Tighten one ring at a time. You can start with the inner ring or outer ring but you must follow the tightening procedure until the full tightening torque has been reached before moving to the next ring.

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  • NBC Group :: Design, Installation & Maintenance

    In extreme cases of long term storage the bearings may need professional dismantling and cleaning inspection reassembly before use. Large slewing rings usually have lifting holes for eye-bolts to assist lifting in the inner and outer rings. Check the weight of the ring to ensure slings and/or chains are of sufficient capacity.

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  • Guide to inspecting and maintaining cranes

    2020-3-30 · 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 not have to be stripped down in the major inspection. The competent person should still

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

    The play, or clearance, in a slewing ring bearing is another important indicator of a problem. A new bearing is assembled with a specific amount of clearance to compensate for slight out-of-flatness encountered in a mounting structure. This clearance can increase dramatically due to wear.

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  • Ultrasonic Testing Services | Boltstress Ultrasonics

    The codes for heat exchanger designs allows Engineers to minimise flange geometry. This saves initial costs but leads to high failure rates. High multitudes (36-84..) of small diameter bolts complies and has adequate strength but leads to very high interactional pre-load losses when they are tightened, consequently they regularly leak.

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  • Slewing bearings - SKF

    2020-10-3 · 47 Inspection 49 Storage 51 Single row four-point contact ball slewing bearings 52 Product data – general ... c onsists of an inner ring (a), an outer ring ... incorporates a gear (e), are provided with holes (f) to accommodate attachment bolts. The holes may be threaded. Generally, only the raceways in the rings (h) are hardened and pr ...

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  • Slewing Ring Bearings - Technical (Turntable Bearings)

    All mounting bolts in a given ring should have equal clamp length. The distance between the head of the bolt and the bolt threads should be at least equal to the bolt body diameter. Thread engagement length of the bolt in the mating steel structure should be at least 1.25 times the bolt diameter.

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  • Bearing inspection and maintenance | thyssenkrupp rothe

    Slewing bearings are safety-relevant wear parts. Consequently, they must be checked regularly. The specified wear limits must not be exceeded. We use application-related measurement methods. The history of the inspection results gives a trend behavior that is taken into account in the maintenance concept and spare parts management.

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  • Guide to inspecting and maintaining cranes

    2020-3-30 · 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 not have to be stripped down in the major inspection. The competent person should still

    Get Price
  • Slewing Ring Bolts & Special Lifting Fasteners -Energy Bolting

    Energy Bolting is a special bolting supplier with a focus on high tensile, performance critical, fully tested and certified slew ring fasteners and crane bolting. ISO 898-1 Grade 8.8, ISO 898-1 Grade 10.9, ISO 898-1 Grade 12.9

    Get Price
  • Bearing inspection and maintenance | thyssenkrupp rothe

    Slewing bearings are safety-relevant wear parts. Consequently, they must be checked regularly. The specified wear limits must not be exceeded. We use application-related measurement methods. The history of the inspection results gives a trend behavior that is taken into account in the maintenance concept and spare parts management.

    Get Price
  • Slew Drive Installation and Maintenance Manual

    2020-10-22 · Thread the bolts and washers, if required, into the slew drive, hand tightening each bolt. Tighten one ring at a time. You can start with the inner ring or outer ring but you must follow the tightening procedure until the full tightening torque has been reached before moving to the next ring.

    Get Price
  • Famous Wanda Slewing Ring Bearing for ... - slew

    Visually inspect the bolts on the slewing ring before each work or at least once a week; After the slewing bearing has just started working for 100 working hours, check whether the bolts are loose, check again in the 300th working hour; check every 500 working hours in the future; shorten the inspection interval in bad working conditions.

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  • HSE Safety alert on high tensile bolt connection on tower ...

    2020-3-10 · Regular inspection and examination of bolt connections 8. High tensile connections are regularly inspected by a competent person to check that pre-load on the bolts has not been reduced. Loss of pre-load can result in movement of the joint under load. The frequency of inspection should be in accordance with the manufacturer’s instructions.

    Get Price
  • HMK Harbour Crane Maintenance in UK Port | Alatas Crane ...

    2021-1-25 · 4. Slew ring grease distribution system inspection. The team inspected all the Lincoln central lubrication components paying close attention to the slew ring system. The luffing cylinder grease lines, fittings and outlets were all functioning well.

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  • Thorough examinations and inspections of lifting equipment ...

    2021-2-27 · Further recommendations on inspection relating to cranes are given in BS 7121 British Standard Code of Practice for the Safe Use of Cranes. The various parts of this standard can be obtained from BSI. Lifting accessories do not normally need formal inspection, provided that proper pre-use checks are made and they undergo their standard thorough ...

    Get Price
  • Ultrasonic Testing Services | Boltstress Ultrasonics

    The codes for heat exchanger designs allows Engineers to minimise flange geometry. This saves initial costs but leads to high failure rates. High multitudes (36-84..) of small diameter bolts complies and has adequate strength but leads to very high interactional pre-load losses when they are tightened, consequently they regularly leak.

    Get Price
  • POWERED ACCESS N WARNING ! TS MA - Simeri Oy

    2019-2-24 · S E R VICE & P A R TS MA N U A L POWERED ACCESS WORK PLATFORM AB38 WARNING ! The AB38N Machine has been re-assessed to ensure compliance to the Machinery Directive (2006/42/EC).

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  • How to correctly install and maintain the slewing ring bearing

    2018-11-15 · Third, regular inspection and maintenance of slewing ring bearing. Check the bolt preload torque for the first time using 100 working hours. If more than 10% of the bolts are loose, check again after the 200th working hour. It will be inspected every 500 working hours in the future; the inspection interval should be shortened in harsh conditions.

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  • SLEWING DRIVE MANUAL - Nobis Industrial

    2020-10-19 · connection. This inspection shall be repeated annually. The inspection frequency may be reduced under special operating conditions. In case of loose bolts, replace all bolts and washers with new ones. 2.8.2 Lubrication and Mounting Bolts . There are three places which need to be lubricated, they are slewing ring raceway, worm thread and

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  • Mechanical service - Certification ,Inspection,ROV LARS ...

    Tension check slew ring bolts . Rocky Motion test slew ring . Callibrating of load cells . Hydr, hose change . General mechanical work. Launching appliances. Lifeboats and rescue boats. Onload Offload release gear

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  • SLEW RING BEARING IN PNG - MIT GROUP

    2021-3-15 · slew ring bearing for deck crane in png MIT has delivered a new slewing ring bearing for Bailey deck crane on a cutter dredger and exchanged it in Papua New Guinea. The slewing ring bearing of the more than 35 year old deck crane appeared to have excessive play during an inspection and had to be replaced.

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  • Slew ring bearing - Quintette Coal Limited

    A slew ring bearing for coupling the superstructure of a large piece of heavy equipment to the base having an inner ring attachable to the underside of the superstructure and an outer ring having gear teeth on its outer cylindrical surface concentric with the inner ring and attachable to …

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  • Installation and Maintenance Instruction - Xuzhou Helin ...

    Besides the inner and outer ring of a slewing bearing must rest fully on the supporting structure surface. Mounting elements selection; Choose bolts of recommended grade, quality class 10.9(metric) or SAE grade 8 bolts, Grade 12.9 bolts are only used in very rare circumstances.

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  • A tower crane letter | Vertikal.net

    2008-2-6 · Before going to work at 5:15am I watched the news on the most recent NY crane accident and it was immediately apparent to me that the Slew-ring assembly had failed. The first thing I did when I got to the top of the 450ft (136m) of 2003, tower crane was check the slew-ring bolts with a 2lb beater using minimum force.

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  • Piling Rig Plant Pre Acceptance Checklist – Safety-Link ...

    The Piling Rig Plant Pre-Acceptance Checklist app covers all aspects of rig inspection, including the cabin, slew and winch, running controls, mast mountings, and more. Items on the checklist include verifying that the seat belt and pedals are fitted and in good condition; that slew ring bolts are fitted; that the brakes are operational; and ...

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  • TGB GROUP TECHNOLOGIES - Pretek

    2018-1-24 · TGB Group has different slew drives models prepared for different kind of applications. - BE Series: Slew drive with high precision and low backlash for industrial applications. Fully enclosed with lip seals to ensure an IP65 on the system. With globoid slewing ring teeth and straight screw worm provides more smooth-

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  • Mechanical service - Certification ,Inspection,ROV LARS ...

    Tension check slew ring bolts . Rocky Motion test slew ring . Callibrating of load cells . Hydr, hose change . General mechanical work. Launching appliances. Lifeboats and rescue boats. Onload Offload release gear

    Get Price
  • Piling Rig Plant Pre Acceptance Checklist – Safety-Link ...

    The Piling Rig Plant Pre-Acceptance Checklist app covers all aspects of rig inspection, including the cabin, slew and winch, running controls, mast mountings, and more. Items on the checklist include verifying that the seat belt and pedals are fitted and in good condition; that slew ring bolts are fitted; that the brakes are operational; and ...

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  • SAFETY PERMIT CONFERENCE CHECKLIST

    2021-3-29 · sections and slew-ring bolts, including retorquing after final assembly. A procedure for written verification of all slew-ring and tower section bolt torques to be maintained at the worksite or on the crane. A description of the relationship of the crane to the building under construction, including minimum clearances

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  • Slew Drive nstallation and Maintenance Manual

    2017-3-1 · The inspection frequency can be increased if there is no special working or extreme weather conditions. In case of loose bolts, replace those bolts, nuts and washers with new ones. 4.2 Re-lubrication of slew drive . Suitable substitute lubricants can be found in Table 3 Manufacturer provisions about .

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  • Case Studies - Alatas Engineering and Design Services

    2021-5-3 · Alatas UK recently completed an Inspection and Test scope of work for our client onboard their semi-submersible accommodation vessel. The scope included the removal and non-destructive testing (NDT) of crane slew ring bolts on two Liebherr BOS cranes.

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  • Tower cranes – Duties of principal contractor | NT WorkSafe

    Pre-erection inspection and testing of the tower crane components is to be performed by competent persons as per manufacturer’s requirements or where these do not exist refer to Australian Standard AS 2550.4-2004 Cranes, hoists and winches - Safe use - Tower cranes. ... connectors, slew ring bolts, slew ring attachment. Records of inspections ...

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  • Mobile Crane Inspection Report

    2020-6-3 · 7 Slew Ring bearing & Bolts Satisfactory. No anomalies noted. 8 Counterweight & Signage Clearly posted. 9 Brakes & Clutches (Wear Indicators) Satisfactory. 10 Pawl Brake Park and slew brakes, satisfactory. 11 Ropes (Terminations, Length) No kink or broken strand evident on both main & auxiliary ropes.

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  • Falcon fined £750,000 ten years on from Battersea collapse ...

    2016-3-17 · The Health and Safety Executive (HSE) investigation found Falcon Crane Hire had not learned from a similar incident nine weeks earlier, when four slew ring bolts sheered on the same crane and all the bolts were replaced. The HSE found the company had an inadequate system to manage inspection and maintenance of its crane fleet.

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  • Sure NDT - Home | Facebook

    Looks like slew ring failure causing the upper works to become dislodged. Luckily the operator escaped with minor injuries. Incidents like this highlight the importance of proper inspections and preventative maintenance including regular rocker bearing wear measurement, slew ring bolt torque checking and non-destructive testing of slew ring bolts.

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  • Slewing Ring Bearings,Ball Slewing Bearing,Slewing Bearing ...

    Materials for Slewing Bearing. 1)Rings: Steel 45#,50Mn(carbon structural steel), 42CrMo (alloy structural steel). 50Mn and 42CrMo are usually used. 2)Rolling element: It is made of chrome steel GCr15 or GCr15SiMn. 3)Seal: It is usually made of NBR,iron,felt,or other thing which meet the capability. Hardness: Normalizing hardness of the rings is 187HB-241HB, quench & temper …

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