Changing Cylinders - Use of a Regulator - Safety Issues
Note: Now that the elevator is fixed, we're back to the
1. Cylinders must be
and transported in a manner to prevent their falling. Escaping gas from
a broken cylinder valve can propel a cylinder through a brick wall.
2. Many gases are
toxic and/or flammable. Knowing about the gas you are working with is
as important as knowing about the reactants in your experiment. If you
are not very familiar with the gas you plan to use, be sure to read its
3. Always use a
to transport cylinders.
4. Cylinders should
be stored and moved with caps screwed in place.
Cylinders and caps have
either coarse threads or fine threads (it's easy to see); do not try to
force a cap onto a cylinder with different threading.
5. Cylinders must be
chained or strapped to a bench, hood, or other sturdy object at all
times. Do not attempt to use a cylinder cart as a securing device in
6. Use the correct
regulator for a particular gas; never attempt to used improvised
adapters. When in doubt, ask someone who knows (me, Ken, or another
research student who has experience).
ground cylinders which contain flammable gases.
Changing a Cylinder
1. Obtain a full
cylinder from Room
4136. Do not, however, return empty cylinders back to the
2. Move the cylinder
lab with a cylinder cart.
3. Place the
date, on the
attached to the full cylinder.
4. Remove the empty
from the system (use a crescent wrench, not a pipe wrench, which
the edges of the nut) and replace the cap.
5. Install the new
6. Take the capped,
empty cylinder to the holding area across the hallway from the third
floor Chemistry Department Stockroom, room 3409; leave it there on the
cart. Notify stockroom personnel of its presence.
Dispensing a Compressed Gas
Please ask an
researcher to accompany you the first time you do this!
1. After the cylinder
has been secured with a safety clamp, remove the cap and screw on the
pressure regulator using a crescent wrench. Do not over-tighten the
2. Make sure the
valve (the needle valve on the outlet side of the regulator) is closed
(clockwise, finger tight) and the delivery pressure screw ( the screw
delivers pressure from one side of the regulator to the other) is
(counterclockwise until it feels loose). Both gauges should read zero.
(counterclockwise) the main valve at the top of the gas cylinder fully
by hand. The cylinder pressure gauge will now register the cylinder
4. Turn the delivery
adjusting screw clockwise until the desired reading on the delivery
gauge is reached.
5. The flow rate can
adjusted using the flow control valve.
6. Shut off the gas
by closing the valves in the same order in which they were opened. Shut
off the main tank first and allow the residual compressed gas in the
to escape. When the gauges read zero, shut the delivery pressure screw
and the flow control valve.