Thread by @OlumideFasanmi

MECHANISMS OF EXPLOSION
A thread about how explosion occurs, stages of combustion, types and control.
Sequel to #abuleadoexplosion and thread by Dr @DrOlusesan & Dr @Yomiclass
I want to add some information so as to help the public understand little bit about pressure system. RT

Explosion is a rapid flame propagation throughout an area containing flammable gases (abule ado incident), vapours (ijegun tank farm) or dusts (sugar or flour industries).
Process industries are mostly at risk of explosion.Due diligence should have been carried out when doing EIA

For explosion to take place, the gas, vapour or dust must be mixed with air in such proportion that the mixture is within the flammability for explosion to happen..
It start small referred to as primary explosion and then followed by a terrifying secondary explosion

STAGES OF COMBUSTION
1-induction period(beginning of combustion process)
2-ignition by a heat source
3-growth, rapid flame propagation
4-steady state, fire burning at full potential. Even fire fighters are afraid of this state, anything can happen. structural failure etc
5-decay

Types of explosion
-confined vapour cloud explosion(vce)
-unconfined vce
-BLEVE: boiling liquid expanding vapour explosion
-dust explosion
These are types of incidents that can happen &we have experience them at one point or the other in this country,just that we dont keep record

BLEVE in detail
Like @DrOlusesan said in his thread & from the root cause saying a truck hit a gas line causing gas to escape to the surrounding before ignition at around 08:00 hours on sunday at #abuleado
How does BLEVE occur and the effect is what i will explain briefly

BLEVE is a rapid phase transition in which a liquid contained above its atmospheric boiling point is rapidly depressurised causing a nearly instantaneous transition from liquid to vapour with a corresponding energy release. Mostly accompany by a large fireball.

BLEVE will consist of
-a blast wave(as felt by many around festac)
-high thermal radiation
-projectiles sent to long distance.

Impact from projectile can cause considerable damage to anyone standing close by or properties.
Blast waves effect is seen on the nearby structures

Prevention and mitigation
I mentioned earlier that EIA (environmental impact assessment) is crucial in accessing potential impact of any project on the surrounding.
That is why citing schools and residential buildings close/along to a process plant is not right.

Control of explosion will involve the following
-plant design and structural protection
-process control
-segregation
-hazardous area zoning
-emergency response & preparedness
Other control most suitable for #abuleado has been highlighted in previous thread
Dr @Yomiclass pls add

May the souls of #abuleadoexplosion rest in place and please be of help to the victims anyway you can. Such blood donation, cash, food, shelter, hospital bills or visit.

Public safety is joint responsibility, we all have part to play.
Dr @DrOlusesan please add any omission sir.