## Featured Articles

Check out the latest featured articles.

## File Library

Check out the latest downloads available in the File Library.

## New Article

Product Viscosity vs. Shear

## Featured File

Vertical Tank Selection

## New Blog Entry

Low Flow in Pipes- posted in Ankur's blog

2

# The Set Pressure Of Psv In Series Of Rupture Disc

7 replies to this topic
|

### #1 phoenixmoca

phoenixmoca

Junior Member

• Members
• 14 posts

Posted 15 November 2021 - 08:21 PM

When a rupture disk is installed at the inlet of PSV what is the relationship between rupturing pressure and set pressure? Should the minimum bursting pressure be more than set pressure? Is there any code or practice having the similar rules?

### #2 latexman

latexman

Gold Member

• 1,191 posts

Posted 15 November 2021 - 08:58 PM

For me, most times RD burst pressure = PSV set pressure = MAWP.

### #3 phoenixmoca

phoenixmoca

Junior Member

• Members
• 14 posts

Posted 15 November 2021 - 09:38 PM

So it doesn't care the rupture disc manufacturing range which may result in the rupture pressure greater than the protected vessel design pressure.

### #4 latexman

latexman

Gold Member

• 1,191 posts

Posted 15 November 2021 - 11:05 PM

Specify +/-0, +0/-5, or +0/-10 %, whatever you can afford. Also, discuss this with RD mnfr.

### #5 phoenixmoca

phoenixmoca

Junior Member

• Members
• 14 posts

Posted 15 November 2021 - 11:27 PM

Yes,latexman. With the different manufacturing range the minimum bursting pressure can be calculated. But I think the set pressure of PSV has no relationship with the minimum bursting peessure but is related to the design pressure of the vessel. And the set pressure and marked bursting pressure are all settled based on the design pressure of cessel.

### #6 fallah

fallah

Gold Member

• ChE Plus Subscriber
• 4,801 posts

Posted 16 November 2021 - 12:40 AM

When a rupture disk is installed at the inlet of PSV what is the relationship between rupturing pressure and set pressure? Should the minimum bursting pressure be more than set pressure? Is there any code or practice having the similar rules?

Hi,

As per various guidelines in API and ASME for a R.D./R.V. combination, the marked burst pressure of the R.D cannot be higher than the marked set pressure of the R.V., but can be lower.

For example in ASME UG-132 (a)(4)(a), for R.D./R.V. combination capacity testing, it is mentioned that: "...The marked burst pressure shall be between 90% and 100% of the marked set pressure of the valve."

Hope this help out...

### #7 breizh

breizh

Gold Member

• 5,188 posts

Posted 16 November 2021 - 02:13 AM

Hi,

Consider the document attached (fike)

Breizh

### #8 phoenixmoca

phoenixmoca

Junior Member

• Members
• 14 posts

Posted 17 November 2021 - 05:51 PM

So as ASME says the set pressure is only related with marked burst pressure rather than minimum burst pressure.