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Anaesthetic FRCA Primary > AWABS - Gas supplies and cylinders > Flashcards

AWABS - Gas supplies and cylinders Flashcards

1
Q

Older cylinders description

A

Thin walled
Seamless
Molybdenum steel
NOT MRI safe

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2
Q

Newer cylinders description

A

Aluminium alloy with fibreglass coating
MRI safe
Lighter weight

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3
Q

Information engraved onto cylinder

A
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4
Q

Information for label around shoulder of cylinder

A
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5
Q

Information from coloured plastic ring in neck of cylinder

A
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6
Q

How are cylinders tested

A
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7
Q

Gas cylinder / valve colour system and how stored

A

New system is that body of cylinder has to be white but colours on shoulder identify the gas

Note helium is brown and white (looks yellow on picture)

Also note Nitrous is “French blue”

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8
Q

Oxygen cylinder size categories and capacity

A
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9
Q

Use of knowing oxygen cylinder sizes

A

To calculate number of cylinders required for transfers etc

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10
Q

Size of oxygen cylinder usually on back of anaesthetic machine

A

Size E

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11
Q

Size of oxygen cylinder used in cylinder manifolds

A

Size J

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12
Q

Size of oxygen cylinders found in ambulances

A

Two size F cylinders are on ambulances

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13
Q

Newer / common oxygen cylinder size in hospital (aluminium alloy and fibreglass cylinder rather than molybdenum steel cylinder)

A

Size CD -smaller in size than size D but higher capacity as higher pressure
460 L capacity
Stored at 23,000 kPa
“Only” oxygen cylinder not stored at 13,700 kPa
A newer version of the D cylinder with an integrated valve

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14
Q

Capacity of nitrous cylinders compared to oxygen cylinders

A

Store higher capacity than oxygen

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15
Q

How to calculate cylinder contents

A
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16
Q

Why Nitrous and CO2 (stored as liquids) need to be measured by weight

A

Pressure remains constant until all liquids used up as when liquid is at saturated vapour pressure

17
Q

Critical temperature definition

A

Temperature ABOVE which a substance cannot be liquified, no matter how much pressure is applied

(will remain in gaseous state)

18
Q

Critical temp of O2

A

-118.6 degrees

(often rounded to -119 degrees)

19
Q

Critical temp if NO

A

36.5 degrees

20
Q

Critical temp of CO2

A

31 degrees

21
Q

Pseudocritical temperature definition

A

The temperature BELOW which there is a risk that a gas mixture will separate out into its constituent parts

(Occurs in gas mixtures eg Entonox)

22
Q

Pseudocritical temperature of Entonox

A

-5.5 degrees

23
Q

What happens if a gas mixture falls below pseudocritical temperature and clinical implication

A
24
Q

How to reverse gas mixture separation

A

Re-warming and mixing

25
Q

How to store Entonox cylinders

A

Horizontally
Above 5 degrees
Large cylinders have dip tube - ensures delivery is from bottom up, therefore never deliver gas with lower than 20% oxygen

26
Q

Filling ratios

A
27
Q

Pin index system

A

Safety mechanism

28
Q

Bodok seal

A
29
Q

Piped gas supply

A

Central supply
Pipelines made of alloyed carbon - bacteriostatic and prevents breakdown of gases
Pipeline supply is 4 bar (400 kPa)
Outlet is colour coded and named with Schrader valve
Schrader valve has gas specific index collar
Non interchangeable screw thread (NIST) on pipework to anaesthetic machine

30
Q

Schrader valve gas specific index collar picture

A
31
Q

Cylinder manifolds

A
32
Q

Vacuum Insulated Evaporator (VIE)

A

Stainless steel outer layer, plain steel inner layer with vacuum between (and ?pearlite)

Superheater made of copper coils

33
Q

Critical pressure for oxygen

A

5 bar

34
Q

Safety features of VIE

A

Specific fill system refers to not accidentally filling it with NO

35
Q

Oxygen concentrators

A
36
Q

Possible side effects of Argon

A

Low dose:
Nausea, Vomiting, Headaches

High dose:
Neurological side effects, Seizures, Weakness

37
Q

Tare weight definition

A

Weight of an empty cylinder / receptacle

Anaesthetic FRCA Primary (48 decks)

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