DEARATOR EXPLOSION 12

[hyl]

HELLO
IN NAJYBIA POWER STATION UNIT NO/4 CAPACITY 100MW .THE UNIT WAS IN OPERATION AND SUDDENLY SHUTTDOWN BECAUSE OF NET FAILURE AND ALSO THEY LOST THE EMERGENCY POWER .
THE DEARATOR WHICH IS OPERATED AT PRESSURE OF 5KG/CM^2 THE THICKNESS OF THE DEARATOR AND STORGE TANK IS 12.5 MM THE DESIGN PRESSURE IS 8.5KG/CM^2 .
THE PRESSURE SUDDENLY INCREASED TO 17 KG/CM^2 IN THE DEARATOR .THE DEARATOR SUDDENLY EXPLODED IN CASTROPHY WAY THE MATERIAL EJECTED IN AIR AND DESTROYED ALL THE AUXIALERY PIPING AND NEAR EQUIPMENT ASLO THE STORGE TANK IS EXPLODED .IT IS UPNORMAL CASE .
MY QUESTION .IS THAT CASE IS NORMAL AND HOW TO ANLYSIES THE CASE WILE THE WEAK AND STRONGE POINT HAS THE SAME DEFFECT..AND CAN THE EXPERT GIVE US SOME ADVICE PLEASE ..THANK AND GOD BLESS .
JAMIL/BOILER ENGINEER

 

[hyl]

Hello Mr sarmad1010
I want to inform you that the root of cause of explostion is explane in the first question of this thread.
Also i attach to you other picture of the dearater explostion in the link below .
Thank you very much and god bless .

jamil a alshahed nama
hartha power station

 

[sarmad1010]

Thanks again and with you all the best

 

[786392]

Dear jamil a alshahed nama Hello, you have definitely shared info of great value to all the colleagues including my self.
I am somehow of the opinion
that none of the De-aerators for steam boilers should be designed for below 300 psig rating especially where system failure chances exist or can be envisaged.
Although this seems costly initially and somewhat overdoing the thing,
but if any segmental loop directly,indirectly(through reverse flow) or even during emergencies may subject such a piece of equipment
to any pressure above 150 psig,then the rating should be higher as per the exposure pressures.
Another thing is the provision of "Fail-safe" and 'Fool proof' Venting and Reliving system(s) either through providing more than one Pressure Relief Valve loops or systems independent of each other in case of total failures of utility etc. systems as indicated in OP

Best Regards
Qalander(Chem)