PPV and Cobra

Question 1

What does PPV stand for?

Answer 1

Postitive pressure ventilation

Question 2

What are the 3 types of ventilation

Answer 2

Self
Automatic
Tactical (Natural or forced)

Question 3

What is forced ventilation?

Answer 3

Vertical and horizontal ventilation when mechanical means are used to accelerate the effects of natural ventilation in removing the hot gases and smoke

Question 4

What are the advantages of PPV?

Answer 4

Replenishes oxygen and reduces carbon monoxide levels
Controls temperature and humidity
Removes moisture, dust and other airborne contaminants
Improves visibility and aides navigation
Restricts fire and smoke damage to property

Question 5

What are the disadvantages of PPV?

Answer 5

Locally intensity fire
Increase potential for backdraught
If exhaust is made incorrectly and force hear and smoke in to unaffected areas of premise

Question 6

What are the phases of ventilation?

Answer 6

Phase 1 post fire - fire completely extinguished
Phase 2 - after control of fire but before extinction
Phase 3 - before control of fire

Question 7

What is the primary function of cobra?

Answer 7

Cool fire gases and suppress fire from outside compartment without the need to enter

Question 8

Tell me about the cobra system

Answer 8

Appliance mounted to high pressure hose reel water jet system
Entrains abrasive into the water jet
Pierces through all common building materials
Delivers fine atomised mist into compartment
Cools gases and suppresses fire without entering

Question 9

What is the working pressure of Cobra?

Answer 9

300 Bar at 400mph

Question 10

How much water does cobra use?

Answer 10

60L per minute

Question 11

What is the droplet size when using cobra?

Answer 11

0.1mm

Question 12

What type of abrasive is used in a cobra?

Answer 12

Iron based

Question 13

What are the advantages of using cobra?

Answer 13

Improved firefighter safety
Compatible with conventional firefighting techniques
Speed of operation
Environment benefits
Economic benefits

Question 14

What should be considered when cutting and piercing using cobra?

Answer 14

Injury to person behind surface
Damage caused beyond cutting surface
Displacement beyond initial cutting surface
Cause fire development due to uncontrolled ventilation

Question 15

How long does a full abrasive vessel last?

Answer 15

4.5 minutes

Question 16

How much abrasive can an abrasive vessel contain?

Answer 16

20kg

Question 17

How much pressure is lost per 80m of cobra hose?

Answer 17

40 Bar