Storage and distribution of medical gasses

Questions and Answers

What color is always associated with oxygen cylinders?

Red

Blue

Yellow

Green (correct)

What are the two most common medical gas cylinder sizes encountered in clinical settings?

D and F

AA and B

E and H (correct)

G and K

What is the volume of an H cylinder at 2200 psig?

244 cubic ft. (correct)

60 cubic ft.

100 cubic ft.

22 cubic ft.

What safety feature is used to secure large medical gas cylinders in storage?

Chains or straps Signup and view all the answers

What is the approximate weight of a full oxygen 'H' cylinder?

126 pounds Signup and view all the answers

What is the relationship between the pressure and volume of gas in a cylinder?

Pressure is inversely proportional to volume. Signup and view all the answers

How can the amount of liquid remaining in a liquid gas cylinder be accurately determined?

By weighing the cylinder. Signup and view all the answers

What must respiratory care practitioners do before pressurizing medical-gas delivery systems?

Clear oil or dust from the system Signup and view all the answers

What does 1 cubic foot of liquid oxygen equal in gas volume?

860 cubic feet of gas Signup and view all the answers

What should you do while transporting a gas cylinder on a cart?

Look out for personnel and hazards Signup and view all the answers

What is the maximum pressure at which liquid oxygen is typically stored in stand tanks?

250 psig Signup and view all the answers

Which of the following indicates that a cylinder valve has been cracked?

Loud hissing noise Signup and view all the answers

Which of the following accurately describes small medical gas cylinders?

Sizes E through AA Signup and view all the answers

What level of precautions should a respiratory therapist observe when treating a patient with well-controlled asthma?

Standard Signup and view all the answers

What is the purpose of cracking the cylinder valve before attachment of any equipment?

To remove dust or particulate matter Signup and view all the answers

What personal protective equipment should a respiratory therapist put on first before entering the room of a patient with MRSA?

Gown Signup and view all the answers

What key feature do the stand tanks for liquid oxygen systems have?

They consist of two steel shells with insulation. Signup and view all the answers

What is used to identify medical gas cylinders with threads?

ASSS Signup and view all the answers

To prevent airborne transmission of measles, where should a 10-year-old boy with the disease be placed?

In an airborne infection isolation room Signup and view all the answers

What is the primary purpose of the American Standard Safety System (ASSS)?

To prevent the interchange of cylinders containing different gases. Signup and view all the answers

Which of the following is NOT a common route of disease transmission?

Walking and talking Signup and view all the answers

Which safety system is used specifically for small cylinder valves?

Pin-Index Safety System (PISS) Signup and view all the answers

What differentiates the Diameter-Index Safety System (DISS) from ASSS and PISS?

It is designed for low-pressure connections. Signup and view all the answers

Airborne transmission occurs by the spread of evaporated droplet nuclei smaller than which size?

5 µm Signup and view all the answers

How is the valve of a small cylinder connected to equipment?

Using a yoke connection. Signup and view all the answers

What is essential for the safe utilization of various medical gas supply systems?

Knowledge of oxygen delivery systems Signup and view all the answers

What feature of large medical gas cylinders enhances their safety?

A protective cap that covers the cylinder valve. Signup and view all the answers

Which of the following can be a consequence of mishandling medical gas supply systems?

It can be potentially lethal. Signup and view all the answers

Which component of the Pin-Index Safety System (PISS) contributes to gas mixture identification?

The number of drilled holes in the valve face. Signup and view all the answers

Which organization developed the Diameter-Index Safety System (DISS)?

Compressed Gas Association (CGA) Signup and view all the answers

What is a characteristic of the safety system for large cylinders?

Different thread sizes and pitches. Signup and view all the answers

What does the marking 'DOT 3AA' indicate on a medical gas cylinder?

The cylinder meets specific D.O.T. standards. Signup and view all the answers

How is the tensile strength of steel in medical gas cylinders retained?

Through a heat treatment process. Signup and view all the answers

What does an 'EE' marking followed by a number indicate on a cylinder?

The cylinder’s elastic expansion under specific test conditions. Signup and view all the answers

What is the purpose of the star symbol next to the test date on a cylinder?

It certifies that the cylinder is approved for 10-year testing. Signup and view all the answers

How often must medical gas cylinders undergo safety testing according to regulations?

Every 5 to 10 years Signup and view all the answers

What construction methods are utilized for forming medical gas cylinders?

Spinning and stamping Signup and view all the answers

What does the normal filling pressure marking on a medical gas cylinder indicate?

The pressure at which the cylinder is operated safely. Signup and view all the answers

What is the consequence if a cylinder does not meet the D.O.T. standards?

It may not be legally filled or transported. Signup and view all the answers

Study Notes

Infection Control Protocols

For well-controlled asthma, standard precautions should be observed by respiratory therapists.
When entering the room of a MRSA patient, put on a gown before any other personal protective equipment.
Measles patients should be placed in an airborne infection isolation room to prevent transmission.
Ventilator circuits should be changed when visual or known contamination occurs, not on a fixed schedule.
Common disease transmission routes include droplet, airborne, vehicle, indirect, vector, and direct; walking and talking are not considered common routes.
Airborne transmission involves evaporated droplet nuclei smaller than 5 µm.

Medical Gas Storage and Distribution

Medical gas supply systems include cylinders, piping systems, liquid systems, and oxygen concentrators.
Medical gas cylinders must meet stringent regulations set by the Department of Transportation (DOT).
Cylinders are constructed from seamless steel and undergo heat treatment to maintain tensile strength.

Cylinder Markings and Identification

Gas cylinders feature DOT markings indicating compliance and filling pressure details.
Safety tests for cylinders must occur every 5 to 10 years, pressurizing them to 5/3 of their service pressure.
The star symbol indicates cylinders approved for 10-year testing and fillings above service pressure.

Cylinder Sizes and Pressure

Common sizes for medical gas cylinders are "E" (small) and "H" (large).
The pressure in a cylinder directly correlates to the amount of gas: a drop in pressure indicates reduced gas volume.

Liquid Oxygen Systems

Liquid oxygen systems offer significant storage advantages by converting liquid to gas (1 cubic foot of liquid equals 860 cubic feet of gas).
Liquid oxygen is stored at low pressure (<250 psig) in insulated tanks to maintain its state.

Safety Systems for Gas Cylinders

The American Standard Safety System (ASSS) prevents the mixing of different gases.
Large cylinder safety systems use various thread sizes and pitches for secure connections.
Small cylinder valves use a Pin Index Safety System (PISS) with specific face hole positions for gas identification.

Diameter Index Safety System (DISS)

DISS is designed for low-pressure connections (0 - 200 psig) and utilizes unique diameter thresholds for gas fittings.

Oxygen and Air Color Codes

Green indicates oxygen, yellow indicates air in gas-filled cylinders.

Safe Handling of Cylinders

Secure large cylinders with chains or straps to prevent falls.
An "H" oxygen cylinder weighs around 126 pounds, requiring careful handling.
Use a cart for transporting cylinders, keeping an eye out for hazards during movement.

Cracking the Cylinder

Cracking a cylinder removes dust and particulate matter, with a loud noise indicating high pressure (2200 psi).
Safety goggles should be worn, and a warning should be given to avoid startling others during this process.
Ensure that all oils or dust are cleared from delivery systems before pressurization.

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Description

This quiz covers key concepts from Hess Chapter 13 on the storage and distribution of medical gases, as well as infection control precautions. Test your knowledge on the appropriate safety measures for respiratory therapists when dealing with patients with specific conditions like asthma and MRSA.