Lightning Risk Assessment & Survey
Procedure for Lightning Arrester testing.
- Lightning probability Risk Factor will be calculated as per Facility Details given by Client.
- Review the existing lightening protection system against national standards
- Mechanical strength to withstand high wind velocity at time of thunderstorms
- Electrical conductivity for clear path for lightning
- Coverage area of lightning arrestor to cover factory area.
- Earthling termination is to be checked for low resistance .
- Suggesting improvements (if required) in the system to comply with applicable standards.
Principles of Lightning
Lightning is caused by the build-up of static electricity within a thundercloud. Negative charge accumulates on the bottom of the cloud and induces an equal positive charge on the surface of the earth. When the potential between the cloud and ground reaches about a billion volts, a downward leader begins to move from the cloud towards the earth. When the downward leader gets to about 200 meters from the earth, upward streamers are launched from the earth towards the downward leader. When the downward leader connects with an upward streamer, then the visible lightning strike is formed and massive current flows between the cloud and earth.
What is Your Lightning Risk?
The chance that your facility will be hit varies on a number of factors such as location, structure height, temperature, and humidity. If all the factors are just right, even areas with infrequent thunderstorms can experience rare, but high intensity, lightning strikes. Lightning can have devastating effects on any operation, whether taking a direct strike or being subjected to the secondary effects from nearby strikes. A single lightning strike to a mission-critical facility poses unacceptable risks which can cripple operations. These risks include fire, loss of product, damage to infrastructure, communications downtime, and loss of life.
How Much will the Next Strike Cost?
In petrochemical facilities, lightning ignites fires that consume millions of dollars of product. The resulting downtime, environmental cleanup, repair, and community impact can be just as costly. For power generation and utilities, the effects can be equally troubling. Lightning may strike at any point on the grid, destroying expensive equipment and leaving customers in the dark.
Lightning also poses unacceptable risks for electronics and communication systems. Because a lightning strike causes an electromagnetic pulse (EMP), the result can be major equipment damage, critical data loss, and lost business opportunities. This risk is shared by data centers, emergency services, corrections facilities, government and military facilities, process manufacturing, and transport hubs but is often overlooked until too late. Unlike antiquated lightning rod concepts, minimizing the risks to your operation. The benefits can be substantial: reduced maintenance costs, improved reliability, increased personnel safety, and a healthier bottom line.