Vessels category per IS 1893

[gr2vessels]

Hi gents,

I am using the Indian seismic standard IS 1893, to specify the design conditions for a number of vessels operating in a gas plant. I found very confusing, the categorization of the vessels, particularly the definition of vessel failure. I am tempted to put every vessel in category 1, knowing the consequences of vessel failure in a gas plant..However, the IS 1893 appears to include in category 1 only the vessels which would affect the population beyond the plant boundary line. Could anyone shed some light on this classification, given my limited experience with this code.

Cheers,

gr2vessels

 

[Zhuge]

Normally vessels in a gas plant can be categorized from Hazard level A,B,C, and D depending on the design temperature, pressure, and contents inside the vessel. You can derived the hazard factor in seismic standard from this mechanical point of view.
you also need to consider the surounding pipelines, vessel, etc hazard level.

 

[gr2vessels]

Thanks Zhuge,
There is no reference to any hazard level in the IS 1893, can you please point me a bit closer to the hazard factor in the seismic standard?
gr2vessels

 

[Zhuge]

Unfortunately, I dont have that strong mechanical background. I've asked my mechanical engineer coleague and he is quite keen to help to indentify the hazard level if you give more specific info about the vessel. such as, the volume, content, design temperature, and the design pressure. I hope its not that urgent.