Dewar Precautions
Gemini VII 2390 Confirm
2 Gemini VII 2390 Confirm Installation Instructions and Checklist
Feb 09
Dewar Precautions
We recommend the following be observed when handling Dewars containing liquefied gases:
• Protect yourself by wearing 1) goggles (or a face shield), 2) an insulated or rubber
apron, and 3) insulated gloves.
• When pouring liquefied gases from one container to another: 1) cool the receiving con-
tainer gradually to minimize thermal shock, 2) pour the liquefied gas slowly to prevent
splashing, and 3) vent the receiving container to the atmosphere.
• Use a plastic stirring rod when stirring substances in a glass Dewar containing lique-
fied gases (or other materials suitable for extremely low temperature). Do not use a
glass or metal stirring rod unless it is coated with some type of soft protective coating.
• Do not remove the mesh covering from a glass Dewar. This covering enables you to
maintain a more secure grip on the Dewar.
• Do not handle heavy objects above a glass Dewar. If unavoidable, place a protective
cover over the Dewar’s opening. If an object of sufficient weight is accidentally
dropped into the Dewar, shattering may occur.
Preparing for Installation
Before you begin installation, make sure the customer has thoroughly reviewed the Gemini
VII 2390 Preinstallation Checklist. Make sure all required equipment and supplies are
unpacked and the required personnel are available.
Always handle Dewars with care. Any product incorporating a vacuum is a potential
safety hazard and should be treated with caution. Always observe the precautions
listed below.
