This Safety and Health Information Bulletin is not a standard or regulation, and it creates no new legal obligations. The Bulletin is advisory in nature, informational in content, and is intended to assist employers in providing a safe and healthful workplace. Pursuant to the Occupational Safety and Health Act, employers must comply with safety and health standards and regulations promulgated by OSHA or by a state with an OSHA-approved state plan. In addition, pursuant to Section 5(a)(1), the General Duty Clause of the Act, employers must provide their employees with a workplace free from recognized hazards likely to cause death or serious physical harm. Employers can be cited for violating the General Duty Clause if there is a recognized hazard and they do not take reasonable steps to prevent or abate the hazard. However, failure to implement any recommendations in this Safety and Health Information Bulletin is not, in itself, a violation of the General Duty Clause. Citations can only be based on standards, regulations, and the General Duty Clause.
The key terms used in this Safety and Health Information Bulletin (SHIB) and their definitions are:
Baling and compacting equipment means: Equipment used for compacting large volumes of low density material into smaller volumes of high density for more efficient handling and transport.
Discharge-door locking mechanism means: The mechanism designed to hold the baler or compactor discharge door in the closed position.
Many industries across the nation use hydraulic baling and compacting equipment. Maryland Occupational Safety and Health (MOSH) identified a serious hazard, failure of the discharge-door locking mechanism, in multiple units of hydraulic baling and compacting equipment produced by one manufacturer, Waste Processing Equipment, Inc. An engineering assessment of this hazard suggests that competent engineering professionals should evaluate all hydraulic baling equipment for this hazard.
The hazard described in this SHIB constitutes a potentially fatal hazard to any workers that may be in the area of the baler or compactor discharge door. Standards for proper design of the discharge-door locking mechanism, discussed in this bulletin, exist both nationally and internationally. Noncompliant designs of balers or compactors and a lack of awareness of this potential hazard can result in fatal injury. This SHIB is a result of a fatality-related case involving this hazard investigated by MOSH.
The purpose of this SHIB is to:
Balers and compactors are machines that use high compression force to compact scrap and refuse material into bales or bundles for efficient handling. In many designs, these machines utilize large cylinders or rams to compress the materials against a heavy, reinforced discharge door. Following the compression cycle, the discharge door moves out of the way to discharge the bale of compacted material. The force imposed on the discharge door is often well over 100,000 lbs. The baler or compactor housing and discharge door must, therefore, withstand the high loads from the compaction ram. These loads result in significant cyclic stresses on the discharge-door locking mechanism. With each compression cycle of the baler or compactor, fatigue cracks can form and propagate through the discharge-door locking bars until the discharge-door locking mechanism ultimately fails. (See Figure 1 below.)
This cyclic stress caused fatigue cracking in the discharge-door locking mechanism in six of nine Max-Pak hydraulic paper balers owned by the employer in the MOSH case. The complete separation of the discharge-door locking bars from the locking mechanism resulted in a worker fatality in the MOSH case. In this case, all four discharge-door locking bars separated from the discharge-door locking mechanism, allowing the discharge door to swing open with deadly force.
MOSH investigated the failure of a Max-Pak Model HCE60FE 8 full-eject, horizontal, closed-end paper baler that resulted in a fatality. MOSH requested an analysis of the failure by OSHA’s Health Response Team (HRT) based at the Salt Lake Technical Center in Salt Lake City, Utah. The HRT found that the failure of the discharge-door locking bars resulted from classic metal fatigue associated with excessive cyclic loading of the locking bars.
The fatality occurred as the paper baler was compressing a load of scrap paper. With fatigue cracks already in advanced stages, the discharge-door locking bars failed catastrophically. Complete failure of the discharge-door locking bars allowed the heavy discharge door to swing open, fatally injuring a worker located near the end of the baler. The failed locking bars are part of the 1st generation (original) design of this equipment. (See Figure 2 below.)
Following the original purchase of the balers in 2005, the employer found a discharge-door locking mechanism on a different baler to be defective and replaced it under warranty; the replacement of this 1st generation discharge-door locking mechanism occurred after approximately three years in service. The employer noticed that a new (2nd generation) design provided by the manufacturer was considerably heavier than the original design. The manufacturer provided no information regarding any inherent operating hazards of the original equipment.
Following the recent fatality in Maryland involving a second baler with a 1st generation discharge-door locking mechanism, the employer began an inspection program for all of its nine balers at various corporate locations across the country. Of these nine balers, six had fatigue cracking in the discharge-door locking mechanism. Upon receiving replacement discharge-door locking mechanisms, the employer found that the manufacturer again redesigned the discharge-door locking mechanism, resulting in a 3rd generation design. (See Figure 3, below - Max-Pak Baler and Sub-Assemblies.)
OSHA is advising owners and operators of all baling and compacting equipment to contact the equipment manufacturer regarding preventive maintenance requirements. If owners or operators are unable to obtain adequate guidance from the manufacturer on these requirements, they should obtain competent engineering support to develop, at a minimum, appropriate procedures to assess the potential for fatigue failure, and then complete proper periodic inspection and testing of the discharge-door locking mechanism.
Guidance on how to safely design, operate, and maintain baling and compacting equipment is readily available from established industry consensus standards (see References section below). Specific OSHA standards that apply to baling and compacting equipment include:
OSHA is providing the following recommendations as general guidance in identifying and addressing potential fatigue failures involving baling and compacting equipment:
The purpose of this SHIB is to minimize the potential for injuries and fatalities caused by baling or compacting equipment fatigue failures. Industry standards provide specific procedures to reduce worker exposures to these operational hazards.
Employers should immediately investigate the potential for failure of their baling or compacting equipment. Guidance from the equipment designer or manufacturer is essential in identifying the location, and the maximum operating loads, of equipment components. Employers should inspect on a periodic basis all components that may experience high cyclic-load conditions to identify incipient cracks or flaws before they progress to failure. Employers also should fit all equipment with appropriately designed safety devices, as noted in recommendation #3 above, to minimize worker exposure to equipment-failure hazards.
OSHA has compliance assistance specialists located in most OSHA offices throughout the nation who can provide information to employers and workers about OSHA standards, short educational programs on specific hazards, or OSHA rights and responsibilities, as well as information on additional compliance assistance resources. Contact your local OSHA office for more information.
OSHA's Consultation Service offers free and confidential advice to private-sector employers to help them identify and correct hazards, with priority given to small employers with the most hazardous operations, or in the most high-hazard industries. Consultation services are separate from enforcement activities. To locate the OSHA Consultation program nearest you, call 1-800-321-6742 (OSHA) or visit OSHA's Small Business web page.
Workers have the right to:
Twenty-seven states operate their own occupational safety and health state plans approved by OSHA. State plans enforce similar standards that may have different or additional requirements. A list of state plans is available at web page.Back to Top