Safety

Question 1

What is the general windspeed limit for safe tower maintenance?

Answer 1

10-12 m/s (22.4-26.8 mph)

Question 2

D-rings, snaphooks, and carabiners must be capable of sustaining a minimum tensile load of ____ pounds (___ kN)?

Answer 2

5,000 pounds (22.2 kN)

Source: OSHA 1910.140 - Personal fall protection systems

Question 3

Anchorages used to attach to personal fall protection equipment must be…

1) independent or dependent of anchorage used to suspend employees or work platforms
2) Capable of supporting at least ____ pounds (___ kN) for each employee attached

Answer 3

1) Independent
2) 5,000 pounds (22.2 kN)
Source: OSHA 1910.140 - Personal fall protection systems

Question 4

1) Personal fall protection systems must be worn with the attachment point of the body harness located…
2) The attachment point may be located in the pre-sternal position if…

Answer 4

1) In the center of the employee’s back near shoulder level.
2) Pre-sternal if the free fall distance is limited to 2 feet (0.6 m) or less.
Source: OSHA 1910.140 - Personal fall protection systems

Question 5

Personal fall arrest systems are rigged in such a manner that…

1) The employee cannot free fall more than how many __ feet (__ m)?
2) PFAS rigged so employee can not contact…?
3) PFAS must be rigged to prevent free fall more than how many __ feet (__ m)?
4) System tested to ensure a maximum arresting force of how many ____ pounds or (__ kN) is not exceeded?

Answer 5

1) Rigged so that the employee cannot free fall more than 6 feet (1.8 m)
2) Rigged in a manner that the employee can not 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.
4) System tested to ensure a maximum arresting force of 1,800 pounds (8 kN) is not exceeded.
Source: OSHA 1910.140 - Personal fall protection systems

Question 6

How much can wind turbine blades deflect (bend) __%?

Answer 6

10% of their length

Question 7

What are Aramid ropes and why are they used?

Answer 7

Aramids have a very high melting point (>500 °C).
Aramid fibers, short for aromatic polyamide, are a class of heat-resistant and strong synthetic fibers. They are used in aerospace and military applications, for ballistic-rated body armor fabric and ballistic composites, in marine cordage, marine hull reinforcement, and as an asbestos substitute.[1]
The chain molecules in the fibers are highly oriented along the fiber axis. As a result, a higher proportion of the chemical bond contributes more to fiber strength than in many other synthetic fibers.
Source: https://en.wikipedia.org/wiki/Aramid

Question 8

The V of two slings, when wider than __ degrees makes each sling bear more weight than the load itself?

Answer 8

60*