We are heading into that time of year when electrical storms become a concern for everyone. The following message is intended to serve as a general safety guideline for those working when an electrical storm is upon us.
Electrical storms can often be accompanied by other severe weather conditions and can require swift decision making. Because no two storms are alike, often employees and supervisors are left to their own judgment to determine whether or not it is safe to work at heights.
Work that is being completed with booms in the air must be discontinued during a lighting storm.
Your safety is the first priority in a lighting storm. Lighting is dangerous because it is random and unpredictable.
IF YOU REQUIRE ANYMORE INFORMATION PLEASE CONTACT YOUR HSE REP
PLEASE REVIEW WITH ALL CREWS AND SUBCONTRACTORS DURING YOUR NEXT SAFETY MEETING.
In the event that a thunderstorm with visible lightning is approaching the site, the following steps should be followed to minimize the risk of personal injury:
(1) The supervisory staff on-site will determine when a storm is close enough for the lightning to pose a safety risk to the site personnel.
(2) Supervisory personnel will use the Flash/Bang (F/B) technique to help measure storm proximity.
(3) The F/B technique states that for every count of three from the time of seeing the lightning stroke to hearing the associated thunder, lightning is 1 km away. A F/B of 9 = 3 km (approx. 2 mi.); a F/B of 15 = 5 km (approx. 3 mi.), etc.
(4) Therefore, when thunder is heard and the F/B ratio is calculated to be 30 representing 10 km, supervisory personnel will inform field personnel of the potential for lightning in the area.
(5) If the F/B intensity increases to a value of 15, supervisory/safety personnel will suspend all crane hoisting and elevated work activities.
(6) If the F/B reaches a level of 9, the site shall be cleared.
(7) All personnel will return to their lunch trailers. Foreman will conduct a headcount and forward this information to the HSE department.
(8) All workers will remain in their trailers until a decision is reached regarding the return to work.
Share This Article
Subscribe to our RSS Feed. What is RSS?