Medical Gas Flashcards
Medical Compressed gas defined by Interstate Commerce Commission- ICC
as any material or mixture having in the container either an absolute pressure exceeding 40lb/psi at 130 F or any liquid flammable material having a vapor pressure exceeding 40 lb/psi at 100 Fâ
Department of Transportation (DOT) responsible for
-gas standards and regulation
-design, construction, testing, marketing, labeling, filing, storage, handling, maintenance, and transportation of compressed gas cylinders
ICC (intersate Commerce Commission) responsible for
defining gas
types of material used as containers:
-titanium container
-carbon fiber container
-plastic container
Container parts- body
- Steel, aluminum alloy, flat on bottom, tapered neck at top, 3/8 inch thick
Valve
bronze, brass, attached to neck of tank
port
point of gas exit
stem
moves up to open or down to close
conical depression
fits the retaining screw of the yoke
pressure relief valve
vents the cylinder under high pressure
pin index safety system (PISS) for which tanks?
A-E
Pin positions: O2=
2,5
N2O
3,5
Air
1,5
CO2
2,6
E tank container weight
14 lbs- most common tank- fits anesthesia machine
E tank contents and pressure: O2=
1900 psig= 660 liters
N2O, nitrous oxide=
745 psig= 1590 liters
air:
1900 psig, 625 liters
Critical Temperature
temp above which no amount of pressure can liquefy a gas
Critical Temp for N2O=
36.5 C
E tank N2O contents are non ___ but supports ____. Stored as ____ at room temp
-non flammable
-combustion
-liquid
how to measure E-tank N2O contents?
measure tank weight not gauge pressure
-subtract weight of empty tank from weight of tank
pressure below 745=
250 liters or less of N2O in tank
Service pressure in psig=
max pressure the cylinder may be filled
Plus sign on tank=
cylinder can be charged up to 10% in excess of service pressure
Star on cylinder indicates=
testing can be every 10 years
Triangle indicates hazard class of gas: yellow
oxidizer = enhance anything under combustion
red=
flammable gas
green=
- non flammable gas
CO2,nitrogen
Container testing=
at least every 5 years except if there is star stamp
Cylinder colors: green
O2 (U.S) white= international
gray
CO2
Blue
N2O
yellow
AIr
Cylinder Storage
Designated tank storage area
Cool, clean, dry area, free from moisture
Not near flame, spark, heat sources
Out of direct sunlight
Store upright in rack preferred
No free standing cylinders
Lay on side if no rack available.
Dont identify gas by cylinder color always check:
label
Pipeline hoses attach to anesthesia machine using
Diameter Index Safety System (DISS)
Pipeline Gas Central Supply
Bulk supply system usually liquid
Two tank banks for small facilities
Tank banks to back up bulk supply
Pipeline Gas Components; piping
Piping extending to various locations
Terminal units
Hoses from terminal units to anesthesia
machine or other equipment.
Concerns with pipeline gas
Hose disconnect
hanging from ceiling
Pulled from wall
Particulate material contaminating line.
Quick couplers are easier to disconnect
Hoses across floor can become occluded
from heavy equipment rolling over hose.
Hazards of Medical Gas
Fires
Incorrect Contents
Damaged or Inoperable valve
Explosion
Contaminated contents
High pressure release
O2 pipeline failure steps:
- alarm sounds
-gases stop flowing
-disconnect pipeline to allow cylinder O2 to flow
Cylinder pressure vs pipeline pressure
45 kpg to 50 kpg
Medical Suction/Vacuum
Pipeline connection
Quick coupler and DISS
Suction pump pulls into wall
Minimum negative pressure 12 mmHg
Pressure gauge guides pressure regulation
Damaged or Inoperable valve
