how to size PSV applied for the storage tank of 55%TBHP (Tert-butyl hydroperoxide )and 45%TBA 1

[phoenixmoca]

As known TBHP is very active chemical sensitive to temperature.
Now it is required to size PSV for the storage tank in which 55%TBHP and 45%TBA is contained.
SO which method is appliable for the case?

 

[The Obturator]

Need to start with the reason for pressure relief; External Fire, Blocked Outlet/Discharge, Thermal Relief etc.

You then need to establish the required relieving capacity dependant on the case. At this point you will probably need to consider whether the fluid is multi phase, in which case you then move onto one of the multi phase calculations.

Once the above basics are known the calculation method can be considered.

Per ISO, only the term Safety Valve is used regardless of application or design.

 

[don1980]

Applications that have auto-reactivity risks, such as this, need expert analysis and expert relief design. Start by getting storage & handling guidance from your TBHP supplier. Then conduct a thorough hazard analysis review, involving people with detailed knowledge of this chemical, and people with a clear understanding of the boundary conditions that are necessary for ensuring safety. As part of that hazard analysis, determine whether it is safe and practical to implement layers of protection which render a runaway reaction non-credible. If so, you have a plain vanilla relief design. If not, the relief design needs to be based on protecting against a runaway reaction, and this should be done by engineers trained in performing reactive relief designs.

The fact that you've posed this question to a group like this indicates that you're likely regarding this in a much too cavalier manner. Questions like this need to be directed exclusively to people who understand the hazards and are able to provide safe informed advice, and I'm not including myself in that group.

 

[phoenixmoca]

to avalveman

Thanks for your reply. The scenario for the vessel overpressure is external pool fire.
And what confuses me is whether DIERS method should be adopted to conduct PSV sizing.

 

[phoenixmoca]

to don1980
I can't agree with you more.
But I have to pose this post in the group because except me my colleagues have little knowledge about PSV.
And I have read many materials about PSV sizing for reactive chemicals. But those are general references for PSV sizing.

 

[don1980]

There are many engineering consulting companies that specialize in process safety and pressure relief. Contact your TBHP supplier and ask them to recommend an engineering company that can do the relief design for this tank (and system). The TBHP supplier has a vested interest in helping you to handle this chemical safely, and they can probably direct you to an engineering company that has done this same hazard analysis and relief design for other TBHP customers. The advantage of using a company that has done it before is that they can leverage what they have already done and learned from doing same task for other clients (TBHP users). Ideally, they will already have a kinetic model developed, which can be directly applied to your installation.

 

[phoenixmoca]

To don1980

Thanks a lot for your suggestion.

But this is my assignment from my department leader. He want me to be PSV sizing EXPERT through many case studies just like this case. So I have been trying my best to search related references which helps me finish the assignment.

But until now it is on the road.

 

[The Obturator]

Per ISO, only the term Safety Valve is used regardless of application or design.

 

[MJCronin]

Again and again, we find out that the root of the problem is management.

"But this is my assignment from my department leader. He want me to be PSV sizing EXPERT through many case studies just like this case."

Does your department leader teach his children to become EXPERT swimmers by taking them to the middle of the lake and throwing them in ?????

MJCronin
Sr. Process Engineer

 

[georgeverghese]

Sure sounds like your HoD has thrown you at the deep end to watch your movements and see how you handle unknown / unfamiliar situations, which is what will occur many times in your career when you are in a lead position in projects.

Presume you've seen this on the net

https://www.icheme.org/communities/...s Archive/S068 - Runaway Reactions/S68-18.pdf

As always, look out for the formation of azeotropes with these non ideal mixtures. Good luck with this baptism of fire.