Burst pressure of rupture disc 2

[mallikarjun07]

Are pressure cycles in a system considered during design of burst pressure of rupture disc. Can someone give me knowledge on this ?

 

[don1980]

Yes, pressure cycles are an important consideration when choosing to use a disk. These cycles can cause metal fatigue, reducing the service life of the disk. If a disk is used in such an application, it's best to use a reverse bucking disk. That results in the disk material being exposed to compression force rather than tension force. Metal fatigue is caused by repeated tension forces, which occurs when you have a forward acting disk.

Note that this is just one of the inherent problems (modes of premature failure) when using a rupture disk instead of a relief valve. If you need maximum system reliability, use a PSV instead of a disk.

 

[LittleInch]

If the cycles still result in pressure less than set pointthen it shouldn't have an impact on the setting of the bust pressure but will have an impact on service life and number of cycles before failure.

Vendors can advise further but I agree with don. Pressure cycles and bursting discs is a bad combination.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[georgeverghese]

The last time I checked, the actual bursting pressure on a BD can be as low as 90% of the temperature adjusted manufacturer's stamped bursting pressure.

 

[mallikarjun07]

Thank you don1980, littleinch, georgeverghese.

 

[EmmanuelTop]

Go through this evergreen article from Phil Leckner:

http://www.cheresources.com/content/articles/safety/rupture-disks-for-process-engineers-part-3?pg=1

(note there are 5 pages of the article)

It explains all the terms and all one needs to know when specifying bursting discs:
[ol 1]
[li]Stamped Burst Pressure,[/li]
[li]Manufacturing Range,[/li]
[li]Burst Tolerance, and[/li]
[li]Operating Ratio[/li]
[/ol]

Dejan IVANOVIC
Process Engineer, MSChE

 

[mallikarjun07]

thank you emmuaneltop.. will surely go though it