BLOCKS / SHEAVES WARNINGS:
Crosby Tackle Block & Sheave Assembly Warnings
- A potential hazard exists when lifting or dragging heavy loads with tackle block assemblies.
- Failure to design and use tackle block systems properly may cause a load to slip or fall – the result could be serious injury or death.
- Failure to design lifting system with appropriate sheave assembly material for the intended application may cause premature sheave, bearing or wire rope wear and ultimate failure – the result could be serious injury or death.
- A tackle block system should be rigged by a qualified person as defined by ANSI / ASME B.30.
- Instruct workers to keep hands and body away from block sheaves and swivels – and away from “pinch points” where rope touches block parts or loads.
- Do not side load tackle blocks.
- See OSHA Rule 1926.1431(g) and 1926.1501(g) for personnel hoisting by cranes and derricks, and OSHA Directive CPL 2-1.36 – Interim Inspection Procedures During Communication Tower Construction Activities. Only a Crosby or McKissick® Hook with a PL latch attached and secured with a bolt, nut and cotter pin (or toggle pin) or a PL-N latch attached and secured with toggle pin; or a Crosby hook with an S-4320 latch attached and secured with cotter pin or bolt, nut and pin; or a Crosby SHUR-LOC® Hook in the locked position may be used for any personnel hoisting. A hook with a Crosby SS-4055 latch attached shall NOT be used for personnel lifting.
- Instruct workers to be alert and to wear proper safety gear in areas where loads are moved or supported with tackle block systems.
- Use only genuine Crosby parts as replacement.
- Read, understand, and follow these instructions to select, use and maintain tackle block systems.
For complete warning and application information, see The Crosby Group at www.thecrosbygroup.com.
General Cautions or Warnings
Ratings shown in Crosby Group literature are applicable only to new or “in as new” products. Working Load Limit ratings indicate the greatest force or load a product can carry under usual environmental conditions. Shock loading and extraordinary conditions must be taken into account when selecting products for use in tackle block systems. Working Load Limit ratings are based on all sheaves of tackle block system being utilized. If all sheaves are not utilized, balance must be maintained, and the Working Load Limit must be reduced proportionally to prevent overloading sheave components. Changes from full sheave reeving arrangement should be only at the recommendation of a qualified person, and incorporate good rigging practices.
In general, the products displayed in Crosby Group literature are used as parts of a system being employed to accomplish a task. Therefore, we can only recommend within the Working Load Limits, or other stated limitations, the use of products for this purpose.
The Working Load Limit or Design (Safety) Factor of each Crosby product may be affected by wear, misuse, overloading, corrosion, deformation, intentional alteration, and other use conditions. Regular inspection must be conducted to determine whether use can be continued at the catalog assigned WLL, a reduced WLL, a reduced Design (Safety) Factor, or withdrawn from service.
Crosby Group products generally are intended for tension or pull. Side loading must be avoided, as it exerts additional force or loading which the product is not designed to accommodate. Always make sure the hook supports the load. The latch must never support the load.
Welding of load supporting parts or products can be hazardous. Knowledge of materials, heat treatment, and welding procedures are necessary for proper welding. Crosby Group should be consulted for information.
Crane component parts, i.e. the boom, block, overhaul ball, swivel, and wire ropes are metallic and will conduct electricity. Read and understand OSHA standard covering crane and derrick operations (29 CFR 1926.550 SUBPART N) before operating proximate to power lines.
Miller Block Warnings & Precautions
All ratings shown in any Miller literature are based on the products being in a new and unused condition. When selecting a product, consideration must be given to the greatest load the product will see, therefore, shock loading must be considered in the overall system design.
All products manufactured by Miller Products are sold with the express understanding that the customer is thoroughly familiar with the safe and proper use and application of the product.
In selecting a Miller product, such factors as extreme heat or cold, excess humidity, moisture, contaminated air, etc. must be considered since these may adversely affect longevity, performance and Working Load Limit.
Do not immerse any standard Miller product in water. Contact the factory for assistance in selecting the special product designed to meet fresh and saltwater applications.
Lift only those loads for which the Miller product is designed. Federal crane regulations prohibit the transport of personnel on any load or wire rope attachment (OSHA 1910, 180-h-3-v).
Miller products are generally designed for applications of tension or straight pull. Side loading must be avoided since it exerts additional force which the product is not designed to accommodate.
All Miller products that utilize hooks are equipped at the factory with hook latches. The only function of a hook latch is to retain loose slings or devices under slack conditions, i.e. no load. They are not intended to be anti-fouling devices, so caution should be used to prevent the latch from supporting any of the load. Routine inspection of the latches must be made to ensure their proper operating conditions. Hook applications might require other hook latches. Should you have any questions regarding hook latches, contact the factory.
WHENEVER WEDGE SOCKETS ARE UTILIZED THESE TWO PRECAUTIONS MUST BE TAKEN:
- When installing wire rope always pre-load the wedge with the wire rope in place. Then attach the end of the rope to the main line with the first clip to be located directly above the socket. It is imperative that the clips and clamps be installed precisely as specified by the manufacturers and in the number and sizes approved by the fitting manufacturers.
- Make allowance for the crimping effect common with all types of wedge sockets. Experience shows the Maximum Load Limit on a line will be reduced by 20% or more with this type of fitting.
NEVER WELD ON ANY MILLER PRODUCT.
Should any modification or repairs be required on any Miller product, contact the factory for information.
INSPECT AND MAINTAIN REGULARLY.
All Miller products are mechanical components and are subject to wear. Worn components do not have the same Working Load Limit as do new components. The total responsibility for the inspection, maintenance and continued use is entirely up to the purchaser/user. Remember, visual inspection may not be sufficient and examination methods such as X-ray, ultrasonic testing, magnetic particle inspection, dielectric resistance and others, might be required to establish the present integrity of the product.
Check to see that your equipment is being inspected and tested in accordance with all applicable governmental rules and regulations. Should any Miller products become worn and in need of repair, the responsibility for the actual repair work will be borne solely by the party making such repairs. It is recommended that the factory be contacted should there be any questions whatsoever relating to a repair. See Maintenance and Inspection.
ELECTRICAL PERFORMANCE OF INSULATING LINKS DEGRADES WHEN LINKS ARE NOT KEPT FREE OF SURFACE DIRT AND CONTAMINATION. INSULATING LINK VOLTAGE RATINGS ASSUME CLEAN AND DRY LINKS AND A DRY ENVIRONMENT. In the case of ELECTRICAL POWER LINE SAFETY use of an insulating link alone in the absence of other required measures is NOT ACCEPTABLE. OSHA power line safety requirements involving the use of cranes and derricks can be found in US federal regulation 29 CFR Part 1926, latest edition.
REMEMBER: External factors will affect the longevity of the product. There is no defined period for the useful life of any Miller product. It is the user’s responsibility to maintain and check the product. Even after a short period of use circumstances may require the product to be withdrawn from service. Should any questions arise during the inspection of any Miller product that relate to its intended application or need for repair, promptly remove the product from service.
The recommended proof load on all items in this catalog is 2 times the Working Load Limit unless otherwise indicated.
Use only new genuine Miller parts for replacement or repair.
Per ANSI 535.4-1991 labels should be inspected and cleaned and safety related labels replaced when no longer legible. Contact Miller for replacements.
Dimensions in this catalog are generally nominal dimensions in inches unless otherwise indicated. Where tolerance information is needed but is not indicated please contact Miller for applicable tolerances.
Weights in this catalog are generally in pounds unless otherwise indicated.
For complete warning and application information, see Miller Lifting Products at www.millerproducts.net.
Gunnebo Johnson Crane Block Warnings
- Never use a crane block without training.
- Always inform yourself…Ask your employer for the manufacturer’s crane block use limitations.
- Always comply with applicable Country regulations.
- Always know load weight.
- Never use a crane block without a legible rated load tag.
- Never overload a crane block.
- Never ride on a crane block or load.
- Never use an improperly rigged crane block.
- Never use a worn-out or damaged crane block.
- Never use a crane block in extreme temperatures.
- Never use a crane block in acidic conditions.
For complete warning and application information, see Gunnebo Johnson at www.gunnebojohnson.com.
Jeamar Blocks Warnings
- Ensure the correct equipment is obtained and installed for the application.
- Ratings shown in Jeamar literature are applicable only to new products.
- Working load limits shown are the maximum load the product is authorized to support under normal environmental conditions. Shock loading and abnormal conditions must be taken into account when selecting products.
- Working load limits shown are the maximum load the product is authorized to support under normal environmental conditions. Regular inspections must be conducted to ensure the equipment continues to meet the most current revision of the published standard.
AVOID SHOCK LOADS
- These are transient loads that exceed the steady-state load. Shock loads are caused by sudden accelerations, usually due to unrestrained loads, swing loads, jerking, or impacting of the load. The working load limit may well be exceeded under these conditions.
- Welding to any Jeamar products can be hazardous and should only be implemented after written permission from Jeamar. Jeamar products are sold on the strict understanding that all product selection is the full responsibility of the purchaser. Jeamar accepts no liability for the use, misuse or incorrect application of its products.
For complete warning and application information, see Jeamar, Inc. at www.jeamar.com.
Rope BlockBlock Warnings
Where equipment has swivelling and moving parts there are potential safety hazards. Care should be taken when working with or repairing such equipment. If used incorrectly breakage could occur inflicting injury or death. When equipment is in use do not put hands: between sheaves, side plates and guards. In area of becket, hook, hook nut and cross head.
Take great care to avoid clothing becoming trapped. Repair and reeving should be carried out by trained personnel only. Power should be switched off before operations are carried out. Work should only take place when equipment is seated on a firm surface.
Limitation of Use
- Working load limit (WLL) should never be exceeded.
- Hook-blocks should be used in vertical lift only.
- Rigging blocks should be used only as in design specifications. Blocks should not be used for towing unless specifically designed and marked for that purpose.
- Swivels should be used in either vertical or horizontal plain only.
- Horizontal and vertical lead sheaves used only as indicated in description.
- Shock or side loading should not be applied unless equipment is designed for that purpose.
- Load should always be in seat of hook or eye. Never at point!
For complete warning and application information, see Ropeblock BV at www.ropeblock.com.