Do dewars need to be chained?

### Yes, Dewars Need to be Chained .

Dewars are containers used to store and transport cryogenic liquids such as liquid nitrogen and liquid helium. These containers are designed to keep these liquids at extremely low temperatures, which makes proper handling essential to ensure safety in the lab. One important safety measure involves chaining the Dewars to prevent accidents and spills.

#### Why is chaining necessary?

Chaining Dewars is a crucial safety precaution because these containers can be quite heavy and difficult to handle. In a busy laboratory setting, there is always a risk of accidentally bumping into a Dewar and causing it to tip over. If a Dewar were to fall over, it could lead to a spill of cryogenic liquid, which can be dangerous to anyone nearby.

#### How to chain Dewars properly:

1. **Select a secure location:** Before chaining the Dewars, make sure they are placed on a stable surface away from any potential obstructions.

2. **Use appropriate chains:** Choose chains that can securely hold the Dewars in place without the risk of breaking or slipping.

3. **Attach the chains:** Securely attach the chains to the handles or designated anchoring points on the Dewars. Make sure the chains are tight enough to prevent movement but not too tight that it damages the containers.

4. **Double-check the security:** After chaining the Dewars, give them a gentle shake to ensure they are securely fastened. Check the chains regularly for any signs of wear or loosening.

5. **Train personnel:** Make sure all lab personnel are trained in the proper handling and chaining of Dewars to maintain a safe working environment.

By following these steps and chaining Dewars properly, you can help prevent accidents and protect both individuals and equipment in the lab. Remember, safety should always be a top priority when working with cryogenic liquids.

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