What is a Vertical Lifeline Assembly and when is it used?
Typical uses for a vertical lifeline assembly include roofing, ladder climbing, general construction, and tower climbing. You may use a VLA in fall arrest applications, stopping a worker who is already in the process of calling and bringing their body to a halt, but they are most used in fall restraint scenarios where the worker worked within a limited amount of space and the system stops them from reaching a dangerous fall hazard.
THE ROPE GRAB
The vertical lifeline assembly relies on a positioning device called a rope grab. The rope grab is the connector between the worker’s full body harness and the poly-rope that connects to the anchor. The rope grab is operated manually, and the user can lock and unlock the device to slide up and down the rope into different operating positions. Once the rope grab is locked into place, do not touch it. If a fall does occur, do not reach for the rope grab, you might unlock it and cause yourself to continue to slide down the rope. As an added safety measure, it is recommended to find out where the VLA poly-rope meets the edge of safety and tie a knot so that the rope grab cannot slide any further than the desired distance.
THE SHOCK PACK
A Malta Dynamics vertical lifeline assembly comes with a rope grab that is equipped with a shock absorption pack attached. This helpful shock pack addition is built into the leg of the rope grab positioning device and must be attached to the worker’s approved full body harness. Before each use, you must always inspect the shock pack to make sure that the plastic covering is still intact, and the pack isn’t deteriorating or broken in any way.
HOW TO USE A VERTICAL LIFELINE ASSEMBLY
To use a vertical lifeline assembly, you must first use the self-locking snap hook to attach the poly-rope to an approved anchor point. Then, measure out the appropriate distance to allow the worker to move around safely in the work environment without reaching the edge or crashing into the ground if fall may occur. Make sure to factor in the length of the shock pack just in case the pack becomes deployed. Use the rope grab positioning device to solidify your location along the rope and lock it into place. Now you are safe to move around the workspace and avoid the fall hazards.
LIMITATIONS AND PRECAUTIONS
When you use any fall protection equipment, you must consider the limitations of the devices you are trusting your life to before you get to work. Free fall, fall clearance, and swing falls are all important factors to be aware of.
Free Fall: According to ANSI Z359.1, when using a VLA in conjunction with a personal fall arrest system, the free fall distance must be limited to 6’. When you use the vertical lifeline assembly in fall restraint, the requirement is that no fall will be encountered so there is absolutely no free fall distance allowed.
Fall Clearance: It is incredibly important that fall clearance is calculated properly. When using the vertical lifeline system in fall arrest scenarios, there must be enough room below the worker to successfully arrest the fall before they hit the ground or lower surface. A competent person should perform a hazard assessment to calculate the fall clearance before any work at heights is started.
Swing Falls: One of the most lethal and overlooked hazards in fall protection. A swing fall happened when the anchorage point is not directly above the worker and is instead off to the side. This creates an angle that can mislead fall clearance calculations and cause the worker to impact the ground or another structure if a call occurs. Swing falls will significantly increase the clearance required to arrest a fall.
OSHA AND ANSI VLA STANDARDS
OSHA has strict guidelines to keep in mind when using a vertical lifeline assembly. Here are a few to be aware of that directly correlate to VLA’s and their use in the workplace.
According to OSHA 1910.140(c)(3), “when vertical lifelines are used, each employee must be attached to a separate lifeline.” This differs from horizontal lifelines where you can have multiple workers tied off to one system.
As is the standard for many fall protection precautions, anchors, and lifelines; per OSHA 1910.140(c)(4); “lanyards and vertical lifelines must have a minimum breaking strength of 5,000 pounds (22.2 kN).”
DO NOT tie knots in rope lifelines. Knots in rope significantly reduce the rope’s strength and integrity. The only knots that are permitted are limiter knots at the end of the system to limit the distance of that the rope grab can travel. As stated in OSHA 1910.140(c)(6); “a competent person or qualified person must inspect each knot in a lanyard or vertical lifeline to ensure that it meets the requirements of paragraphs (c)(4) and (5) of this section before any employee uses the lanyard or lifeline.”
Malta Dynamics uses a high strength poly-rope to ensure our products exceed the OSHA standard1910.140(c)(15) which mandates that “lifelines must not be made of natural fiber rope. Polypropylene rope must contain an ultraviolet (UV) light inhibitor.”
These standards, among many other safety requirements will help you to make sure you are using your fall protection equipment safely and correctly. Do not overlook the importance of reading the manuals and following the proper protocols, your life is precious.
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