8 replies to this topic

[sima-f]

Hi

How can the pressure profile downstream of a rupture disc discharging a three-phase fluid into a burn pit be calculated? Is there any software available for this purpose?

 

[twell]

for two / three phases flow , depending from process, you can try to model the disc with the models adopted for valves (i.e. HEM, HNE etc.), there are several threads in this forum discussing those applications.

[breizh]

Hi,

talk to vendor of rupture disk, they may have tools to support you. Try with Fike, Protectoseal. 

Attached example of technical document from Fike.

Please clarify 3 phases (organic and aqueous phases + gas) or (liquid + solid+ gas).

My 2 cents

Breizh 

Attached Files

•  fikerupture_disk_sizing_tb8102.pdf   201.46KB   9 downloads

[sima-f]

Thank you for your response, but I'm primarily looking for a method to calculate the downstream pressure drop across the rupture disc in order to design the necessary 

[breizh]

Hi,

Check API 520 part1,

other resources attached.

Good luck

Breizh

Attached Files

•  bursting disk sizing.pdf   63.67KB   8 downloads
•  Sizing Rupture Disks forTwo-PhaseFlow.pdf   37.04KB   4 downloads

[sima-f]

thank you so much

[sima-f]

In calculating the reaction force on the rupture disc, the pressure used as the AP factor corresponds to which pressure? Practically, is the back pressure the output pressure of the rupture disc, or is it the burst pressure?

[breizh]

Hi

Check API 520 part 2 , pages 7 and followings.

another resource : Google , key words rupture disc reaction force calculation

Breizh

[latexman]

In calculating the reaction force on the rupture disc, the pressure used as the AP factor corresponds to which pressure?

Per equation (2) on page 11 of API 520 Part 2, "P is the static pressure within the outlet pipe immediately before terminal expansion to atmosphere, in psig [kPa (gauge)].”

It's the pressure just inside the end of the pipe. That pressure will be due to exit losses and compressible flow effects, if any. If the pipe outlet has choked flow, it could result in an elevated pressure just inside the end of the pipe.