CHM 605. Compressed Gas and Cryogen Safety. compressed gases hazards storage, handling & transportation using gas line assembly leaking cylinders empty cylinders special: flammable, toxic, and highly toxic gases cryogenic liquids storage and handling PPE cool traps and baths.
Compressed Gas and Cryogen Safety
storage, handling & transportation
gas line assembly
special: flammable, toxic, and highly toxic gases
storage and handling
cool traps and bathsContents
“Compressed gas” is defined as a gas or mixture of gases having, in a container, an absolute pressure exceeding 40 psi at 21.1°C (70°F)
Liquid nitrogen and liquid helium at or near their b.p. are not “compressed gases.” Even if there’s a little pressure.
bp < -160ºC and used as ….
N2 and He most common here
Most of the “normal” size cylinders everywhere around here (N2, Ar, H2, He, air, O2, CO2….) are at 2200 - 2600 psig.
This was a combination chemical hazard PLUS pressure issue…
physical force -- “gas propelled rocket” (if the valve becomes damaged).
simple asphyxiation (oxygen displaced)
chemical hazards, e.g. flammability, reactivity, burns
health hazards, e.g., toxicity, mutagenicity…Pressurized Gas Hazards
Aldrich Tech Bulletin AL-151
Acetylene, Arsine, Diborane, Fluorine, Hydrogen Cyanide, Germane, Hydrogen fluoride, Nitrogen dioxide, Oxygen, Phosgene, Silane
This is a partial list.
See Approval Form
(Asphyxiation is forever….)
(a) broken bone(s)
(b) back sprain/strain
(c) tissue damage (“cold burn”)
(d) hearing loss