See UC San Diego requirements for safe storage and handling of compressed gases.
UC San Diego researchers working with compressed gases must follow an approved Hazard Control Plan (HCP) in the Chemical Hazard Use Application (CHUA). This HCP must be preapproved by the principal investigator prior to beginning any work with this material.
Information on this Blink page is supplementary and is not intended to replace the approved HCP.
Use and storage of compressed gases is strictly regulated according to hazard classification.
Compressed gases are classified as class I, II, III, or IV in order of decreasing hazard.* Classes are based on the lethal concentration to 50% of test animals (rats) of each gas (LC50).
|UCSD Compressed Gas Hazard Classifications|
|Class I||LC50 (rat) ≤ 200 ppm|
|Class II||201 ppm LC50 (rat) ≤ 2000 ppm|
|Class III||2001 ppm LC50 (rat) ≤ 5000 ppm|
|Class IV||LC50 (rat) > 5001 ppm|
* Note: The California Fire Code uses a different classification system. For more information, contact EH&S Fire & Life Safety, (858) 534-3659.
Storage and use requirements apply to all compressed gases.
Implement additional safety precautions for strong>particularly hazardous substances (classes I, II, and III). Requirements are relaxed for small quantities and short term usage.
If you are responsible for ordering compressed gas products, read Compressed Gas Cylinders Overview for details on ordering, services, and rental fees.
This 2-video set was presented by Eugene Y. Ngai of Chemically Speaking LLC in May 2013 for UCSD researchers and Environment, Health & Safety staff. Key elements of a CG safety program and pre-planning for emergency response are covered.
Safety training handouts presented with this program are below:
All files are PDF, courtesy of Chemically Speaking LLC
Gas cylinders are not always ideal in a lab setting for transportation, storage, safety, or other practical reasons. Consider the alternatives below:
Gas is generated on demand. This may alleviate fire code limitations on the storage and use of these gases:
Gas will flow out of the cylinder only if a vacuum is drawn on the cylinder valve outlet. Four types of systems are available that operationally meet this criteria:
UC San Diego requirements for engineering controls, protective equipment, storage, emergency response, warning systems, and employee training are based on: