Several of the current electro/mechanical CO sensors will give a false indication of CO when exposed to solvents and especially when exposed to isopropyl alcohol. If the potential for CO presence can be definitively ruled out, consider using an atmospheric monitor with no CO sensor.

Recently, we had a client ask about these specific uses of the Sked-EVAC tripod. Here’s what the manufacturer (Skedco) had to say…

“Is it safe to attach a ‘change of direction’ onto the lower end of one of the tripod legs?”

“No!” According to Bud Calkin, the manufacturer of the tripod. He continues in saying that it is unsafe to pull horizonally on one leg of any tripod because it may cause the tripod to shift and destabilize the system. Skedco recommends the use of a separate anchor in this case.

“Is it acceptable to use the tripod as an ‘A’ frame and lean it over the edge?”

Yes, if you rotate the tripod feet so that the pointed ends of the feet are down and supporting the tripod. According to Skedco, if you are working on a surface that would allow the feet to slip, you must tie or secure the feet in such a manner that they cannot slip and allow the system to collapse.

By using any tripod that has swiveling feet in that configuration (bipod) with the feet flat on a hard surface, you will experience uneven pressure on the edges of the feet as it is leaned over the edge. This could possibly damage the feet because of the angle at which they are turned (i.e., the feet are pointed toward the center of the triangle formed by the tripod). This angle places the weight of the tripod onto the edges of the feet and that is not what they are designed for.

Skedco also says that when using the Sked-Evac tripod as an “A” frame, it is necessary to attach ropes to the two unused anchors that are attached to the head. You can do this by using carabiners. Tie the tripod back in the opposite direction from the load that is being hoisted. This will prevent the tripod from leaning too far over the edge and causing the system to collapse. Check all rigging and attachments for safety prior to lifting any load, especially a human load.

The improper use of any tripod is very dangerous and could be fatal. It is the responsibility of the user to get proper training prior to using a tripod or any other rescue equipment.

Yes, with a couple of extra precautions.

•    The rope should run over an edge for extra control.
•     A line tender should be added to assist the primary belayer.

 

The three levels of protection required by OSHA for confined space entrants are:

1) Hazard Awareness

2) Retrieval Equipment

3) Rescue Services

Yes. A retrieval system should be used whenever an entrant enters a permit space, unless the retrieval system creates a greater hazard to the entrant or does not contribute to the rescue effort.