#600 vessel nozzle Flange
#600 vessel nozzle Flange
(OP)
Dear Friends,
We have a #600 piping project that will connect to a vessel due to codes and standards this pressure class has to have sealing rings on pipe flanges but the vessel nozzle flange is not for sealing ring, it’s RF. My question: Is it correct?
Best Regards
Luiz Souza
We have a #600 piping project that will connect to a vessel due to codes and standards this pressure class has to have sealing rings on pipe flanges but the vessel nozzle flange is not for sealing ring, it’s RF. My question: Is it correct?
Best Regards
Luiz Souza





RE: #600 vessel nozzle Flange
Our piping specifications have a mix of RTJ's on Class 300 flanges and RF's on Class 2500 Flanges. Things like steam > 300 psig and thermal heating fluid all have RTJ's.
Can you comeback with a little more details.
RE: #600 vessel nozzle Flange
We are using this project for testing and measurement of on-shore oil well, max pressure 25 psig and max temp is 104° F.
We've contracted the designing and fabrications of these vessels and when they came up I figure out that nozzle flanges are RF, I ask contractors why, they told they had followed ASME code for the vessels and it was correct.
RE: #600 vessel nozzle Flange
Concerning the pressure I mentioned above the correct is 355,584 psi
RE: #600 vessel nozzle Flange
RE: #600 vessel nozzle Flange
RE: #600 vessel nozzle Flange
Was the contractor not given specs that spelled out specifically what type of flanges needed to be used on the connections?
Brian
RE: #600 vessel nozzle Flange
Thanks for your reply. The problem is if the contractor says he is correct what is the code I could check out?
We do process design but we do not do vessel design, we only give them at the time of bidding a data-sheet that doesn't specify the vessel it serves only as a guide for them to design.
RE: #600 vessel nozzle Flange
I cannot ever recall a time where I've had to do anything more than pick the type specific appropriate class flange out of the standard acceptable flanges based on pressure and temperature according to the customer's specifications. It is really pretty cut and dry.
Sounds like there is a breakdown somewhere in the communication between you and the contractor over this RF flange issue.
Brian
RE: #600 vessel nozzle Flange
Also my opinion, is at 356 psi and 104 F, a raised face is fine, especially if used with a sprial wound gasket. I don't think you'll have any problems.
Regards,
Mike
RE: #600 vessel nozzle Flange
Thanks again
Luiz Souza
luizhenrique_99@yahoo.com
RE: #600 vessel nozzle Flange
For your specific condition (365 psi @ 104 F), I do not know why do not you use flange class 300 instead of class 600.
RF flange is O.K. as SnTMan's post.
RE: #600 vessel nozzle Flange
That's due our clients specs (our main client www.petrobras.com.br) concernig the site the equipment we've sold to them require.
RE: #600 vessel nozzle Flange
RTJ's are generally reserved for pretty harsh services, either in process fluids or pressure/temperature. Can't see the need for the conditions quoted... perhaps it's the product/process fluid? Perhaps the client is unduly conservative speccing an RTJ piping system [e.g. Our 600# steam system is an RF spiral wound system, whereas the Ammonia system is an RTJ 150# system...]
It seems that someone wasn't on the ball specifying a vessel with a 600# RF nozzle when it needs to connect into a 600# RTJ piping system.
If the piping spec is truly required to be RTJ [Client's directive or good practice] then the vessel nozzle ideally should be RTJ. The alternative would be to use a mating 600# RF spec for the pipe flange at the nozzle, then spec break back to the RTJ piping spec for the piping system... and have this reviewed and approved by the relevant owner engineer/project manager.
Cheers
Rob
RE: #600 vessel nozzle Flange
Thanks for your explanation. You're pretty right the customer is unduly conservative, the fluid/process is not harsh, that's crude oil, natural gas, sand and water that comes from the wells, we have only cavitation to worry about, as you see, not a so dangerous product.
The alternative we've already take was exactly you suggests, but we have one problem two instruments to be connected on vessel were specified, and purchased as RTJ flanges.
What is, in your opinion, the unique way out? To change flanges to RTJ for these instruments? That's what we're thinking about.
RE: #600 vessel nozzle Flange
...somewhere down the line, a facilities engineer is going to curse the hodge podge of flange types that don't seem to have good reason.
IMO, and based on my limited understanding of all the competing demands, I'd make the vessel RTJ.
Cheers
Rob
RE: #600 vessel nozzle Flange
Good luck,
LV
RE: #600 vessel nozzle Flange
I've checked the site you mentioned I couldn't find this wonderfull gasket, may you tell me the name?
I('m still astonish if is there a gasket like that !!!