Fall arrest equipment requires enough space to stop a worker before they strike a lower surface. In an industrial facility, pipework, machinery, or an intermediate platform can restrict that space. A fall arrest system must therefore be selected around the actual clearance at each working position, with calculations completed before the anchorage layout and connecting equipment are finalized.
Assess clearance across the full working area
For facilities in the UAE and KSA, the assessment should cover the full maintenance route. Clearance beneath one section of a platform may differ considerably from the space available a few meters along it. Surveying the intended working positions helps identify where an equipment arrangement could allow contact with an obstruction.
The calculation must account for the initial free fall, deceleration distance, harness attachment movement and the applicable safety allowance. The worker’s body also extends below the harness attachment point. Omitting that dimension can leave insufficient space beneath the worker even when the connecting equipment arrests the fall within its specified distance.
Use the correct measurement reference
A manufacturer’s clearance figure may be referenced to the anchorage or working surface. The site measurement must use the corresponding reference point. Applying a figure without checking its basis can produce an incorrect result, particularly where the anchor sits below the worker’s harness attachment.
The clearance calculation should follow the instructions for the specific equipment and its installed configuration. Anchorage position and available clearance both influence the suitability of a lanyard for the task.
Account for horizontal lifeline deflection
Under fall-arrest loading, a horizontal cable lifeline deflects, increasing the distance travelled by the worker. The design must accommodate this movement alongside the arrest distance of the attached equipment.
Where available clearance is restricted, an overhead rigid rail may be worth assessing because it eliminates cable sag. The selected connecting device and installation arrangement still determine the clearance required.
Check the swing fall path
A worker who falls away from the point directly beneath an anchor can swing towards nearby structures. With a self-retracting lifeline, this swing can significantly increase the clearance requirement.
Checking only the vertical distance beneath the starting position can overlook hazards elsewhere along the fall path. Anchorage placement should therefore be assessed against the worker’s permitted movement and the surrounding obstructions.
Revise the arrangement when clearance is insufficient.
Depending on the task, revisions could involve relocating an anchorage or selecting compatible equipment with a shorter arrest distance. A restraint arrangement may also be appropriate because it can prevent the worker from reaching the fall hazard. Equipment selection should follow the available anchorage, access requirements, and measured clearance.
Fall protection equipment from Dutest
Dutest supplies KARAM fall protection equipment across the UAE and KSA, including fixed horizontal and vertical lifelines, full-body harnesses, fall arrester blocks and lanyards. Its range also includes overhead safety solutions for work at height. For industrial facilities specifying a fall arrest system, Dutest offers equipment options that can be assessed against the project’s clearance calculations and access requirements.
Categorised in: Fall protection systems
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