Davit Arm Systems for Confined Space Applications
Davit arm systems are commonly used to raise, lower, and suspend personnel performing routine work duties or to facilitate rescues in vertical confined space applications such as vaults, manholes, and pump stations. By adding a manual or mechanical winch to the davit arm system, personnel can be lowered into the confined space or extracted with relative ease. Whether your davit arm system needs to be designed and configured for permanent or temporary access, the safety specialists at Diversified Fall Protection can recommend a system to suit your specific confined space and rescue requirements.
- Davits feature a 5000 lb (2268 kg)anchor point for fall arrest anchorage.
- Height adjustability eliminates the need for custom length masts and extensions.
- Davits can be equipped with back mounted winches or SRL’s with retrieval capabilities.
- Lower mast extensions allow the user to increase the overall anchorage height of the system.
- Portable and fixed base options available.
Personal Fall Arrest Systems: System performance criteria. In addition to the general requirements in paragraph (c) of this section, the employer must ensure that personal fall arrest systems: 1910.140(d)(1)(i)
- Limit the maximum arresting force on the employee to 1,800 pounds (8 kN); 1910.140(d)(1)(ii)
- Bring the employee to a complete stop and limit the maximum deceleration distance the employee travels to 3.5 feet (1.1 m); 1910.140(d)(1)(iii)
- Have sufficient strength to withstand twice the potential impact energy of the employee free falling a distance of 6 feet (1.8 m), or the free fall distance permitted by the system; and... 1910.140(d)(1)(iv)
- Sustain the employee within the system/strap configuration without making contact with the employee's neck and chin area. 1910.140(d)(1)(v)
If the personal fall arrest system meets the criteria and protocols in appendix D of this subpart, and is being used by an employee having a combined body and tool weight of less than 310 pounds (140 kg), the system is considered to be in compliance with the provisions of paragraphs (d)(1)(i) through (iii) of this section. If the system is used by an employee having a combined body and tool weight of 310 pounds (140kg) or more and the employer has appropriately modified the criteria and protocols in appendix D, then the system will be deemed to be in compliance with the requirements of paragraphs (d)(1)(i) through (iii). 1910.140(d)(2) The employer must ensure that:
- On any horizontal lifeline that may become a vertical lifeline, the device used to connect to the horizontal lifeline is capable of locking in both directions on the lifeline. 1910.140(d)(2)(ii)
- Personal fall arrest systems are rigged in such a manner that the employee cannot free fall more than 6 feet (1.8 m) or contact a lower level. A free fall may be more than 6 feet (1.8 m) provided the employer can demonstrate the manufacturer designed the system to allow a free fall of more than 6 feet and tested the system to ensure a maximum arresting force of 1,800 pounds (8 kN) is not exceeded. 1910.140(d)(3)
- Body belts. Body belts are prohibited as part of a personal fall arrest system.
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