Bleve Flashcards

(16 cards)

0
Q

What are some steps to reduce BLEVES at rail tank car changes?

A

Heat retardant wrap under shell of tank
Insulation under shell
Heat shields at the most common points of impact
Locking tank car couplers (eliminate punctures)
Flame retardant spray

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1
Q

4 steps to reduce the risks of BLEVEs at bulk stations

A
Emergency shut-off valves
Excess flow and back flow valves
Heat detectors that sound alarms
Water deluge system
Fixed water sprayers
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2
Q

How full are tanks filled?

A

85% to leave room for pressure expansion

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3
Q

Tank container sizes

A

10 000 gallon tanker trucks

30 000 gallon rail tankers

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4
Q

BLEVEs can explode and burn people how far away?

A

1000 feet

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5
Q

What does prv stand for?

A

Pressure release valve

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6
Q

Main points to consider when approaching a BLEVEs

A

Is there a leakage that may result in fire?
How long has the tank been inflamed?
How much water is available?
What threats to life and property ?

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7
Q

Propane is pressurized to store and transport as a liquid. At what rate is it pressurized?

A

270 times it’s volume

Plg- pressurized liquid gas

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8
Q

At what temperature can propane no longer be maintained as a liquid?

A

97 degrees Celsius

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9
Q

True or false,

Only flammable substances can BLEVE

A

False

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10
Q

The danger zone for projectiles

A

Over 1000 m

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11
Q

Tanks can BLEVE between 3-12 minutes depending on size. What are the times given for each size?

A

BBQ tanks 2-3 mins
400 L tanks 3-4 mins
4000 L tanks 5-7 mins
40 000 tanks 8-12 mins

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12
Q

Four main dangers with BLEVEs

A

Fire
Thermal radiation
Pressure from blast
Projectiles

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13
Q

Fire ball radius

A

400 l 18 metres
4000 l 38 metres
40000 81 metres

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14
Q

Thermal radiation rule of thumb (distance)

A

4 x the radius of the fireball to a minimum of 90 metres

400 l 90 metres
4000 150 metres
40000 320 metres

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15
Q

A 40 000 litre tank requires how much water to successfully cool the tank?

A

2000 litres a minute