Fireworks And Explosives - 806 Flashcards Preview

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Flashcards in Fireworks And Explosives - 806 Deck (25)
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1

How are explosives defined by the HSE?

'Any material that is capable of undergoing a self-contained and self-sustained exothermic chemical reaction at a rate that is sufficient to produce substantial pressures on their surroundings, thus causing physical damage'

2

What are the 2 types of explosive materials?

• detonating
• deflagrating

3

Describe detonating explosions

• when reaction exceeds speed of sound

4

Describe deflagrating explosions?

• below speed of sound
• pressure, heat and confinement influence rate of reaction not the material

5

What is the most common accidental cause of explosion?

Mixture of natural gas and air following a gas leak

6

What is 'over pressure?'

• Blast wave from an explosion
• velocity greater than speed of sound
• can kill

7

Up to what distance are fireworks designed to propel to before explosion?

50-100m

8

How big can the fireball be from fireworks?

100m diameter

9

What can lead to a significant mass explosion event with regards to fireworks?

Excessively loaded containers or illegal storage of non standard fireworks

10

How should fireworks be stored

• in 'ISO' shipping containers
• plenty of space

11

Explosives with radio controlled detonators or metal components can be detonated by radio transmissions within what distance?

60m

12

NATO prohibits radio signal within what distance of explosive materials?

600m

13

Who should be informed when explosive storage is identified?

Station managers should inform ORPT (operational resilience and planning team)

14

How do 'Yankee hazards' appear on the MDT?

• red triangle, black exclamation mark

15

On arrival to a suspected explosive hazard, what information should the ic gather from the responsible person?

• quantity
• type
• location
• storage
• separation
• involvement
• site plans
• fixed installations
• safety control measures
• building design features

16

What priority message must be sent when explosives are confirmed?

' explosives confirmed involved'

17

If the ic believes that explosives have been subject to heating or fire, what should be done?

• set up cordon
• withdraw all personnel and public

18

Once explosives are ignited, can they be extinguished?

No

19

What is the maximum storage of fireworks for domestic use for a shop?

250kg in ISO container

20

How much black powder are gun enthusiasts holding a 'acquire and keep certificate' allowed to keep?

20kg

21

What are 'railway fog signals?'

• small round discs with 8g black powder
• Small primary charge
• make noise but do not fragment
• treated as high explosive when stored in bulk in metal boxes

22

What size cordon should be set up for explosives up to 250kg?

200m

23

What size cordon should be set up for explosives 251kg-2000kg and any military explosive munitions?

600m

24

What size cordon should be set up for explosives over 2000kg?

1000m

25

How are explosive hazards identified?

'Yankee hazard'