Vessel Clamp for Highly Corrosive Product

Hi cingold,

What is the construction and size of the vessel?

Mike

cingold,

I just reread your post and I started thinking about the process conditions: 60psi and 600ºF. Seriously 600ºF? Are you talking about pure HF gas or is it an HF solution in water?

Need to know this kind of stuff before even thinking about the solution.

Material of construction (MOC) and the size of the vessel need to be known as well.

Please let us know! Considering that you are close to the minimum thickness (although MAWP = 1/3 of actual rupture pressure), this is a serious issue; solutions may even include stopping processing until the new vessel is in place and tested.

Mike

<...60psi and 600ºF.....or is it an HF solution in water...>

Er, at those conditions it might be a mixture of HF and H₂O as vapour, i.e.steam.

Exactly the reason for my question.

Yes it is an HF solution although I don't know the concentration (maybe around 20% based on what I know of other parts of the process).

Material is Monel and size is 60" diameter.

We have an turnaround coming for this unit and this vessel is the driver so it is possible that we can stop the process.

However, I just need conceptual ideas at this point. That's why I left off most of the design variables. The conditions I gave are design conditions not operating.

Automated weld overlay is an accepted means of restoring pressure boundary thickness (unlike thermal spray). Based on the metallurgy involved, it has the added advantage of providing a barrier to future corrosion.

It's expensive but, it's often not nearly as costly as replacing a new vessel.

see www.teamindustrialservices.com

Not much help, but my advice would be to STAY OUT OF THE PLANT.

HF is nasty stuff as you know. Trying to shoot down HF vapour clouds with fire hoses is not something you want to get involved with.

G morning Mr Cingold, in concordance with Guru Mikerho, the kind of fluid (Gas or Solution) is a good help to thing about your question. Any way, you talk about Desing pressure and temperature. What about the operation conditions? Is possible to reduce these two conditions until safety values (New calcs.) without impact in your production, and wait for the new vessel arrival date?.

Another point, you have to prepare the by pass to the new vessel circuit integration.

Be Safe. AT

I don't know the operating conditions for this.

I doubt we can reduce the conditions without impacting operations but it is something I will ask as we get a little further in our design.

Right now, we are just tossing around ideas so I thought I would ask the CR4 community to see if anyone has some tips.

Again, I'll stress the weld overlay option; it's a permanent solution whereas everything else being considered here is a simple band-aid fix.

I'd suggest that you contact a couple of the big players in this field to see what they can do for you. Some are quite fast. You might just find out that they can machine-overlay the vessel within the time already allocated to the turnaround.

You may contact "Special Metals" in Huntington WV to see what kind of "rubber"-(believe it or not) that they use in their acid transporting railcars.

I think not for HF. Teflon maybe but it is porous to HF. Letharge cured viton - maybe. Kalraz - not enough money!