What is unconfined vapor cloud explosion?
When a flammable vapor is released, its mixture with air will form a flammable vapor cloud. If ignited, the flame speed may accelerate to high velocities and produce significant blast overpressure.
What causes Vapour cloud explosion?
A vapor cloud explosion (VCE) results from the ignition of a flammable mixture of vapor, gas, aerosol, or mist, in which flame speeds accelerate to sufficiently high velocities to produce significant overpressure. additional indirect effects from missile generation, crater formation, ground shock, and fire.
How do you stop a vapor cloud from exploding?
Containment of fuel is the best way to prevent vapor cloud explosions. Ignition sources for flammable vapor clouds — for example, heaters, vehicles, unclassified electrical areas, hot work, static discharge — are difficult to control.
What factor mainly affects vapour cloud dilution rate?
The rate at which this occurs is dependent on the level of obstructions to vapour flow around the site and in particular any changes in ground level.
What is UVCE in safety?
The unconfined vapor cloud explosion (UVCE) is fire accidents that could cause severe damage and it sometimes leads to high potential of casualties.
What is meant by Bleve?
A type of rapid phase transition in which a liquid contained above its atmospheric boiling point is rapidly depressurized, causing a nearly instantaneous transition from liquid to vapor with a corresponding energy release.
What is VCE in safety?
The explosion resulting from the ignition of a cloud of flammable vapor, gas, or mist in which flame speeds accelerate to sufficiently high velocities to produce significant overpressure.
What is Vapour cloud?
A vapor cloud is vapor which has gathered in one place. An estimated 30 tons of cyclohexane volatilized and formed a large vapor cloud. A rupture of a pipeline carrying liquefied petroleum gas may lead to the formation of a vapor cloud. A vapor cloud is vapor which has gathered in one place.
What is Vapour cloud formation?
Definition of ‘vapor cloud’ A vapor cloud is vapor which has gathered in one place. An estimated 30 tons of cyclohexane volatilized and formed a large vapor cloud. A rupture of a pipeline carrying liquefied petroleum gas may lead to the formation of a vapor cloud. A vapor cloud is vapor which has gathered in one place.
What is explosion and give the classification of explosion?
An explosion is a sudden and rapid increase in volume and release of energy in an extreme manner. This is usually accompanied by the generation of high temperatures and release of gases caused by changes in pressure, temperature and phase. In mining, explosives are the most obvious form of explosion hazard.
What is UVCE fire?
What is the full form of UVCE?
University Visvesvaraya College of Engineering (UVCE) was established in 1917, under the name Government Engineering College, by Bharat Ratna Sir M. Visvesvaraya.
What type of explosion is a BLEVE?
A BLEVE is a boiling liquid expanding vapor explosion, which occurs when the pressurized liquid inside a vessel, such as a propane tank, reaches temperatures higher than that liquid’s boiling point.
What causes a BLEVE?
A BLEVE occurs when a vessel containing liquid above its normal boiling point and under pressure fails catastrophically. When the vessel fails, the pressure immediately drops to atmospheric, and the hot liquid rapidly boils, generating a large quantity of vapor.
What is a Vapour cloud?
What is Bleve fire?
The failure of a closed container as a result of overpressurization caused by an external heat source. A major failure of a closed liquid container into two or more pieces when the temperature of the liquid is well above its boiling point at normal atmospheric pressure.
What is an example of a vapor?
The most common example of a vapor is water vapor (gas phase water) at room temperature and one atmosphere of pressure. Do not confuse a vapor with a dust, a fine suspension of solid particles or a mist, a fine suspension of liquid droplets. A good synonym (alternate word) for vapor is gas.
How clouds are formed step by step?
Heated by sunshine, the ground heats the air just above it. That warmed air starts to rise because, when warm, it is lighter and less dense than the air around it. As it rises, its pressure and temperature drop causing water vapor to condense. Eventually, enough moisture will condense out of the air to form a cloud.
What BLEVE means?
What causes BLEVE?
What are the signs of BLEVE?
BLEVE Warning Signs:
- Ringing sound from the metal shell.
- discolouration of the tank structure.
- Flaking of small metal pieces.
- Bubble or bulge on the tank surface.
- A sudden increase in the tank pressure.