No Entry Fall Zone; Preparation Of Inspection Surface - Jireh tripod User Manual

27 No Entry Fall Zone
DANGER!
kept clear at all times. A clearly marked NO ENTRY FALL ZONE must be cordoned off directly below
the area of crawler operation.
The area below an operating crawler must be kept clear at all times. A clearly marked NO ENTRY FALL
ZONE must be cordoned off directly below the area of crawler operation, according to the dimensions
shown in Figure 16 (below).
Example: If inspecting a tank that is 6m (20ft) tall, the No Entry Fall Zone radii must be no smaller than
3m (10ft) from the area below the area of crawler operation.
28 Preparation of Inspection Surface
• Remove build-up of scale, soot, and other debris (i.e. dirt, ice) from surface on which the crawler is to
drive. Excessive build-up will cause the wheels to lose magnetic attraction which may lead to wheel
slippage or crawler detachment.
• Ensure there are no obstructions (other than standard butt welds) or voids in the drive path.
Obstructions and voids, if driven into or over, could cause the crawler to fall.
• Ensure there are no patches of non-ferrous material in the drive path of the crawler. If the crawler
drives over a non-ferrous patch, it will lose magnetic attraction and will cause the crawler to fall.
TriPod User Manual
FALLING OBJECT HAZARD. The area below an operating crawler must be
Figure 16 - No Entry Fall Zone
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