Storage and distribution of medical gasses 2

Questions and Answers

What is the specific gravity of carbon dioxide at STPD?

1.03

0.93

1.53 (correct)

2.00

Which gas is used in combination with oxygen for treatment of severe airway obstruction?

Carbon dioxide

Nitrous oxide

Nitric oxide

Helium (correct)

What is a significant characteristic of nitrous oxide as an anesthetic?

It provides true anesthesia at low levels.

It supports combustion.

It is nonflammable.

It has a CNS depressant effect. (correct)

At what starting concentration does nitric oxide begin to affect the respiratory system?

20 ppm Signup and view all the answers

What is a primary characteristic of helium?

It is nonflammable and inert. Signup and view all the answers

Which gas is known as 'Laughing Gas'?

Nitrous Oxide Signup and view all the answers

What factors are necessary to estimate the duration of gas flow from a cylinder?

Gas flow, cylinder size, and cylinder pressure Signup and view all the answers

Which of the following gases does NOT support combustion?

Carbon Dioxide Signup and view all the answers

What is the primary purpose of safety systems designed by the Compressed Gas Association?

Prevent the delivery of the wrong gas having different connections. Signup and view all the answers

Which color code is used for Helium/Oxygen cylinders?

Brown & Green Signup and view all the answers

What is the typical working pressure for a full H-cylinder that has passed the elastic expansion test?

2200 psig Signup and view all the answers

Which safety system is represented by the acronym ASSS?

Designates the connection type for large cylinders. Signup and view all the answers

How many cubic feet of compressed gas does an H-cylinder hold?

315 cubic ft. Signup and view all the answers

How many minutes of oxygen can one E cylinder provide at a flow rate of 10 l/m?

47.6 minutes Signup and view all the answers

What is the expansion factor for one cubic foot of liquid oxygen?

If a patient requires 10 l/m of oxygen for a trip lasting 110 minutes, how many full E cylinders are required?

3 full cylinders Signup and view all the answers

Which statement regarding gas cylinders is FALSE?

Can be tested every 10 years. Signup and view all the answers

What is typically required before administering a medical gas to a patient?

Deliver the gas to the bedside and reduce it to workable pressure. Signup and view all the answers

What is the total volume in liters produced from 1.25 lbs of liquid oxygen when expanded to a gaseous state?

430 liters Signup and view all the answers

At a flow rate of 4 l/m, how many minutes will 1720 liters of liquid oxygen last?

172.5 minutes Signup and view all the answers

What is the weight of liquid oxygen per liter according to the provided information?

1.5 lbs Signup and view all the answers

What is the typical factory preset pressure for the first stage of a multistage reducing valve?

200 psi Signup and view all the answers

Which of the following is NOT an advantage of a multistage reducing valve?

Higher energy consumption Signup and view all the answers

What type of valve is used as a safety shutoff in each zone of a multistoried building?

Zone valve Signup and view all the answers

How are medical compressed gases classified in terms of fire risk?

Nonflammable, supports combustion, and flammable Signup and view all the answers

Which of the following gases is classified as nonflammable?

Carbon dioxide Signup and view all the answers

What effect does increasing the concentration of oxygen have on burning speed?

Increases the speed of burning Signup and view all the answers

Which characteristic is true for oxygen as a medical gas?

It greatly accelerates combustion Signup and view all the answers

What is the function of a riser pipe in a multistoried medical facility?

To supply oxygen to each floor Signup and view all the answers

What is the capacity of a full 'H' cylinder in cubic feet?

244 cubic feet Signup and view all the answers

For an 'H' cylinder with 1100 psig used at 8 l/m, how long will it last in hours?

7.195 hours Signup and view all the answers

What is the cylinder factor for an 'E' cylinder?

0.28 Signup and view all the answers

If an 'E' cylinder with 1800 psig is used at 4 l/m, how long will it last?

126 minutes Signup and view all the answers

What is the gauge pressure of a full oxygen cylinder?

2200 psi Signup and view all the answers

What factor is to be considered when transporting a tank outside a hospital?

Safety buffer of 500 psig Signup and view all the answers

Which formula is used to calculate the duration of flow for a gas cylinder?

Pressure x Cylinder Factor / Flow Rate Signup and view all the answers

What must be done to convert the duration of flow from minutes to hours?

Divide by 60 Signup and view all the answers

Study Notes

Safety Systems for Medical Gases

Compressed Gas Association designed systems to prevent wrong gas delivery, ensure proper tank storage, and maintain labeling accuracy.
Safety systems include ASSS (American Standard Safety System), PISS (Pin Index Safety System), and DISS (Diameter Index Safety System).

Medical Gas Cylinder Characteristics

H-cylinder holds approximately 244 cubic feet of compressed gas.
E-cylinder contains about 22 cubic feet.
Working pressure for a full H-cylinder is typically around 2200 psig.

Medical Gas Colors and Properties

Helium/Oxygen (He/Ox) is colored Brown & Green.
Carbon Dioxide (CO2) is colorless, odorless, and does not support combustion.
Nitrous Oxide (N2O) is colorless with a sweet taste, used as an anesthetic.

Role of Reducing Valves

Single Stage Reducing Valves lead to safe pressure control, reducing high pressures (approx. 200 psi) to functional levels (50 psi).
Multi-stage reducing valves allow for precise pressure regulation and higher flow rates.

Medical Gas Fire Risks

Medical gases classified based on flammability:
- Nonflammable: Nitrogen, Carbon Dioxide, Helium
- Support combustion: Oxygen, Nitrous Oxide
- Flammable: Cyclopropane, Ethylene

Estimating Duration of Gas Flow

Duration calculated by cylinder pressure, flow rate, and cylinder size.
Tank factors for calculation:
- E-cylinder = 0.28
- H-cylinder = 3.14

Example Calculation for E-cylinder

For an E-cylinder with 1800 psig and oxygen flow of 4 L/min:
- Duration = (1800 x 0.28) / 4 = 126 minutes.

Transporting Cylinders

Transport planning requires a buffer; for 2200 psig, deduct 500 psig for safety.
Example: Transporting with 10 L/min flow requires calculating the number of tanks needed for the duration of the trip.

Liquid Oxygen Expansion

1 cubic foot of liquid oxygen expands to 860 cubic feet of gas.
Liquid oxygen weighs approximately 2.5 lbs per liter.

Additional Considerations

Each floor of a building has zone valves for gas control.
Regular inspection and testing of gas cylinders is mandated (every 5 to 10 years).
Medical-grade air is produced through filtering and compressing air.

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Description

This quiz explores the properties and therapeutic applications of medical-grade gases, focusing on carbon dioxide and helium. Understand how these gases are used in treatments and medical equipment like ECMO. Test your knowledge on their characteristics and significance in the medical field.