Calculating LEV face velocity to hold plate in place.

In summary, the conversation discusses the necessary face velocity and plate specifications for an LEV (local exhaust ventilation) system. The LEV must have a face velocity of 1m/s and a plate that is .1 m2 in size. The plate needs holes in order to maintain the correct velocity and keep the plate in place. The conversation ends with one person admitting they have no idea where to start.
  • #1
mink_man
23
0
LEV needs to be at 1m/s at the face.
Let’s say area of LEV is .1 m2
What size plate (with holes or not in it) and weight is needed for the plate to fall off if the face velocity is less than 1m/s but the velocity is enough to keep the plate on the lev face if the speed is 1m/s or greater. I think the plate needs holes as otherwise it would be just suction rather than velocity keeping the plate in place.

I have no idea where to start.
 
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  • #2
mink_man said:
LEV needs to be at 1m/s at the face.
Let’s say area of LEV is .1 m2
What size plate (with holes or not in it) and weight is needed for the plate to fall off if the face velocity is less than 1m/s but the velocity is enough to keep the plate on the lev face if the speed is 1m/s or greater. I think the plate needs holes as otherwise it would be just suction rather than velocity keeping the plate in place.

I have no idea where to start.

What's an LEV?
 

1. What is LEV face velocity?

LEV face velocity, also known as local exhaust ventilation face velocity, refers to the speed at which air is drawn into a local exhaust ventilation system. It is typically measured in feet per minute (fpm).

2. Why is it important to calculate LEV face velocity?

Calculating LEV face velocity is important because it helps determine the effectiveness of a local exhaust ventilation system in capturing and removing harmful airborne contaminants. It also ensures that the system is operating at the proper speed to maintain a safe working environment.

3. How do you calculate LEV face velocity?

The formula for calculating LEV face velocity is: face velocity (fpm) = airflow (cfm) / capture area (ft2). This equation takes into account the amount of air being drawn into the system and the size of the capture area.

4. What is the ideal LEV face velocity for holding a plate in place?

The ideal LEV face velocity for holding a plate in place will depend on the size and weight of the plate, as well as the type of local exhaust ventilation system being used. Generally, a face velocity of 100-200 fpm is recommended for holding smaller plates in place.

5. How can you adjust LEV face velocity to hold a plate in place?

If the calculated LEV face velocity is not sufficient to hold a plate in place, there are a few possible solutions. These include increasing the airflow of the system, reducing the size of the capture area, or adjusting the positioning of the plate to ensure it is in the direct path of the air flow.

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