05. Equipment

Question 1

Concerning cyrogenic liquid systems, what volume of gas does 1 volume of liquid oxygen give you?

Answer 1

842 times its volume.

Question 2

What is the pressure inside a VIE?

Answer 2

10.5 bar

Question 3

Does oxygen require heating at the outlet of a cryogenic liquid system?

Answer 3

heating of gaseous oxygen is required at the outlet using a heat exchanger

Question 4

What is the length of onsite storage capacity requirement of VIE?

Answer 4

14 days.

Question 5

Is nitrous oxide liquid in cylinders?

Answer 5

yes, up to 95% liquid

Question 6

Regarding pipes:
What are they made of?
What is the pipeline pressure of oxygen, N2O, medical air and surgical air?

Answer 6

Made of copper,

4 bar for all except surgical air which is 7 bar.

Question 7

Difference between where Schrader sockets and NIST are used?

Answer 7

1. Schrader sockets and probes are used to connect to terminal outlets for medical gases.
2. NIST is used to connect to anaesthetic machines.

Question 8

What flow does the emergency oxygen flush have to provide?

Answer 8

It should provide at least 35 L/min to match inspiratory flow rate

Question 9

What flow should suction be able to provide?

Answer 9

25 L/min is a required displacement capacity of suction system

Question 10

How do you check the performance of the suction system?

Answer 10

should be able to generate negative pressure of more than 500 mmHg in 10 seconds when tube is kinked.

Question 11

Suction tubing should be off high/ low resistance and compliance?

Answer 11

low resistance and compliance.

Question 12

In a TEC 6 Vapouriser:
What is the purpose of the splitting ratio?
What is Desflurane heated to?

Answer 12

Splitting ration ensures saturation of fresh gas flow with anaesthetic vapour.

TEC 6 is heated to 39C.

23.5C is boiling temperature of Desflurane

Question 13

How much CO2 will 1kg of soda lime absorb?

Answer 13

250 L

Question 14

What is the largest component of soda lime?

Answer 14

The largest component calcium hydroxide (80%)

Question 15

What size is the scavenger connector?

Answer 15

30 mm

Question 16

What information is required to calculate the remaining amount of N2O in a cyclinder?

Answer 16

MW of N2O (44)
Avogadro’s number (22.4)
cylinder’s weight
cylinder’s weight when empty

Question 17

In a TEC 6 vaporiser, what is the vaporising chamber pressurised to?

Answer 17

The vaporisation chamber is pressurised to approximately 200 kPa

Question 18

What type of vapouriser is a TEC 6?

How is it different from other vapourisers?

Answer 18

It is called measure flow vaporiser

It is different from ordinary TEC vaporizers to provide very accurate electronically controlled gas injection of Desflurane into carrier gas.

Incorporates a differential pressure transducer

Question 19

What is the pressure across APL valve limited to?

Answer 19

60cm H20

Question 20

What size of connectors are generally used in a breathing system?

Answer 20

15 mm and 22 mm,

except for scavenging which uses 30 mm.

Question 21

What does the oxygen failure alarm depend upon?

Does it depend upon an electrical source for the alarm?

Answer 21

Activation is dependent solely on oxygen supply pressure. It is coupled to a valve that interrupts the flow of anaesthetic gases

Electrical source not required for the alarm.