Module 3 Medical Gas Supply Flashcards
Regulates design, performance, labeling, testing, transportation, filling and storage, construction of medical gas cylinders
The Dept. of Transportation
Regulatory Agency)(Mandatory to Follow
Regulates medical devices.
-Can recall devices at any time and stop shipment orders
FDA
Regulatory Agency)(Mandatory to follow
P.I.S.S. of Oxygen
2-5
P.I.S.S. Nitrous Oxide
3-5
P.I.S.S. Air
1-5
Adiabatic Compression
Fire Hazard
Recompression of high pressure gas in the cylinder yoke, when cracking open, heats up to 1000f can ignite dust, grease , oil
FYI:
- Open cylinders slowly
- Don’t allow valves, regulators, gauges & fittings to come in contact with oil, greases, lubricants, rubber or combustible substance
- No aluminum o2 compressors, only brass
Adiabatic Expansion
AKA Joule-Thompson effect
Icing Effect
Icing over cylinder, due to expansion of high pressure gas to low pressure atmosphere through leaks from improper seals of cylinder to yoke or leaks around the valve stem
P.I.S.S. Nitrogen
1,4
Name the most common gas cylinder size utilized in the hospital and with the anesthesia machine _______.
E.
FYI:
Cylinder sizes range from A-H, A being the smallest while H the largest.
True or False:
A gas stored partially in liquid form in a cylinder, such as nitrous oxide, will drop its cylinder volume in proportion to a drop in cylinder pressure.
False.
Simple:
Nitrous oxide will read full until 75% of the tank is utilized this is because typically the liquid has evaporated at this point. The liquid form of nitrous oxide is what makes the gauge read more full than it really is.
Details:
A gas stored partially in liquid form will show a constant pressure reading even as the contents of the tank are being utilized and gas volume is falling. This will continue until all of the liquid has evaporated, at which time the pressure will drop in direct proportion to the rate at which the gas is withdrawn. (usually drop quickly-signifying your tank is about empty).
-400Liters will gauge begins to fall
- Nitrous oxide
- Carbon dioxide
True or False:
A non liquified gas will show a steady decline in pressure until the cylinder is empty.
True.
Cylinder volume is proportionate to a drop in cylinder pressure
FYI:
- oxygen
- helium
- Nitrogen
- Air
True of False:
The cylinder color is the best method to ID cylinder content.
False.
Cylinder labels are the best method to ID contents. Color is useful to ID the contents from a far/ to use for sorting purposes.
How often must gas cylinders be inspected and tested?
At least every 5 years.
Special circumstances, every 10 years.
Describe what is inspected at least every 5 years on a gas cylinder.
- internal and external visual check for corrosion/ outside for deformity (dents)
- Leaks and retention of structural strength
FYI: this is done by imposing 1.66x their service pressure (max pressure to which the cylinder can be filled at 70 degrees) upon a cylinder.
Ex. 1.66 Xs normal. Ex O2 E cylinder 2200psi x 1.66= 3154psi
Hydrostatic Test
A test to determine strength of cylinder and if there are any leaks.
Water if filled to 5/3 or 1.66x service pressure and left for 30 seconds. Part of a DOT requirement every 5-10 years.
- If pressure drops and water is rising in barrette (there is usually an inside leak)
- Pressure drops water drops= high pressure leak and O ring needs replacement
*more to come for this card
