This is not BLEVE which is Boiling Liquid Expansion Vapor Explosion.

BLEVE is only for liquid containers that is heated to a point that the vapors contained within suddenly expands outwards when the containement failed and the expanded vapor ignited.

Something like your tong gas which is liquidfied gas, you put fire outside until the heated tong vaporised all the liquid inside, causing high pressure. Then the tong cracked under intense heat and pressure, the resulting vapor released is what is called a BLEVE.

This is a pressurised gas line rupture, and the gas ignited. There was no fire before the rupture, else we can see smoke everywhere before the explosion.

Based on the still standing building beside the site of release that is not black in color, there was no large release of gas before ignition, or else everything around it will be caught in the explosion and either burned or shatter.

Thus I will conclude it is a pipe rupture, gas sudden released and subsequent ignition of the fuel/air rich mixture. Thus is my amateur conclusion.

usually gas company will put additive, ayam forget the name, but it smell really terrible so that people will notice the leak

problem is this case the digging did by some small time contractor with little knowledge working
on high risk area, their method of digging must like when your excavator bucket hit something, that's the max point of the digging

even it is pipe rupture, you still need an ignition source. natural gas don't auto ignite at ambient temperature

so it is a vapor cloud explosion, the nearby house should be the ignition source.

a burning incense, a hot engine surface and etc

thousand of potential spark point in a residential area.

back hoe operated korek korek while smoking cigarette lo.....

typical construction site behaviour, brought into oil and gas environment

If you are talking about smell detection, yeah sure you can 'detect' a leak if you are there or the wind blows your direction, the concentration is sufficient, etc. So you can report it to authorities (BOMBA).

But the operators monitoring the pipe flows will not detect the 'neglegible' leaks. It is 'accepted' there will be leaks, whether it is 'harmless' or not, etc before a decision is made to shut the pipes down for maintenance.

Yes, this is true.

However normally supplier and client have their own flowmeters, and also designated flow for each client.

So for instance in this case, client will experience sudden drop in pressure and flow, will attempt to compensate and will probably call the supplier to ask wtf going on.

Supplier will experience a sudden high flow and drop in pressure. Their own controls will compensate and reduce the flow and to build up pressure. They will check if any client is pulling too much.

At this point, if the bomba havent called them yet, they would have to quickly deduce that they might have a pipe burst somewhere and shut their valves and follow their emergency procedure.

However, this is only for large leaks relative to the normal flows. If they are only supplying 100kg/h, even a 10kg/h leak is considered big. If the suppliers are pushing 100t/h flows, 50kg/h leaks might not be noticeable and will be compensated by AUTO controls.

I dono la... If even you can come out thing like that then i dont think a million or billion dollar industry wont just dont care about it and never find a solution for this. Gas pipe line is not new also and it is not something that can be taken lightly for its safety. Even a small leakage can cause explosion and fatality. I pretty sure these industries know how important to detect early leakage big or small.

Korek then leak then boom terus this 1 i can understand la... korek then leak then boom 1 or 2 days later really susah to make sense. But still i can't say i am right also la... Better wait report out see la...