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Portable Quad Frame Fall Protection Systems

The Tuff Built by Diversified Mobile Quad Frame Fall Protection System provides a convenient, portable means of securing an OSHA compliant fall arrest rigid rail in areas with limited space or outdoor areas lacking overhead anchor points for tie-off. Quad or Box Frame Fall Arrest Systems are rigid rail systems built to accommodate a specific area or piece of equipment and can be designed as permanent or portable frames, for ease of relocation.

The table below shows standard stock sizes/configurations, but if your application requires modifications to an existing design, contact us to discuss your specific needs.

We are a complete turnkey provider of OSHA compliant portable and mobile fall arrest systems and have years of design and installation experience.  Contact us for expert assistance with your fall arrest, fall restraint and fall protection safety requirements.

Stock Design Configurations

Model Width Length Height to Anchor Point Overall Height Inside Length Overall Width
Quad Frame, 12W-16L-18H-2R-2A-P 12'-0" 16'-0" 18'-4" 20'-0" 14'-5" 13'-0"
Quad Frame, 12W-16L-18H-1R-2A-U 12'-0" 16'-0" 18'-4" 20'-0" 14'-5" 13'-0"
Quad Frame, 12W-15L-16H-1R-2A-U 12'-0" 15'-0" 15'-10" 17'-6" 13'-5" 13'-0"
Quad Frame, 14W-34L-22H-2R-4A-P 14'-4" 34'-4" 21'-8" 23'-4" 31'-5" 15'-4"

OSHA Regulations

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.

Talk to a fall protection specialist

Tell us about your fall protection needs, and we’ll configure a system that rises to your challenges.