Meta to metal face seal
Meta to metal face seal
(OP)
I have been tasked to make a metal to metal static face seal for steel cycling between 20 and 900C to contain steam at maximum 5 bar.
No gaskets or extra sealing materials. Good contact between sealing faces for thermal conduction. About 100-150mm sqr. similar to flange or manifold and bolted together.
What sort of flatness would be required for a for a steam-tight seal?
I might be able to use soft metal gasket but it would have to make good thermal contact.
Any thoughts welcome?
Many thanks
No gaskets or extra sealing materials. Good contact between sealing faces for thermal conduction. About 100-150mm sqr. similar to flange or manifold and bolted together.
What sort of flatness would be required for a for a steam-tight seal?
I might be able to use soft metal gasket but it would have to make good thermal contact.
Any thoughts welcome?
Many thanks





RE: Meta to metal face seal
RE: Meta to metal face seal
A picture would be helpful.
RE: Meta to metal face seal
TTFN

FAQ731-376: Eng-Tips.com Forum Policies
RE: Meta to metal face seal
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Meta to metal face seal
RE: Meta to metal face seal
TTFN

FAQ731-376: Eng-Tips.com Forum Policies
RE: Meta to metal face seal
RE: Meta to metal face seal
RE: Meta to metal face seal
RE: Meta to metal face seal
Good luck with it. Standard valve problem, gate valves.
Regards,
Cockroach
RE: Meta to metal face seal
Why not considering a single metal o-ring? this one will be good enough to make a good sealing, working at these temperatures wouldn't be any problem, and also it's a "soft solution" (because deformation) to don't worry about torque pressures
On the other hand, ceramic based seals will work also on such a low pressure
http://www.hidromar.es
RE: Meta to metal face seal
RE: Meta to metal face seal
The point with these seals (as far as I hardly know them) is that these seals are not prepared to work under these conditions, I mean, being face seal.
Swageloc system is good while fitting 2 parts (tubes...)
http://www.hidromar.es
RE: Meta to metal face seal
RE: Meta to metal face seal
Silver plating gaskets is a good idea at these temperatures.
RE: Meta to metal face seal
RE: Meta to metal face seal
-Dustin
Professional Engineer
Pretty good with SolidWorks
RE: Meta to metal face seal
Just like "brainstorming" (not to be critical)
Europipe: Spiral wound gasket will be good as far as maintenance will be considered, but, I think, this system would be "no maintenance". At the same time, torque tend to be higher, and temperature is a point to take care about. Regarding temperature, you'll need ceramic or metal "wound" but, on both cases, maintenance will be needed.
bcd: Thermiculite, as far a I know, is a "paper gasket" and, even withstanding such a high temperature is a "different" kind of gasket, I think, that the one needed just because it's asking good thermal conduction, and, as far as I know, this seal trend to issolate. By the way, it's a cheap solution (also to take care about)
ShaggyPE: I don't know this one, but, after taking a look at their web site, it seems to be, again, a "copper washer" working as seal. Isn't it?
Have a good day!
http://www.hidromar.es
RE: Meta to metal face seal
Something to do, I suppose:)
RE: Meta to metal face seal
I would preferr not to use gasket and just have flat face contact of two steel flanges.
RE: Meta to metal face seal
How are sealing faces clamped together?
Approximately how much real estate is available to the seal?
What manufacturing processes are available?
Few pressure cycles or many?
Short service life or long?
Cheap or expensive?
So you get, for example, Hidromar brainstorming over ideas put forth by Europipe, bcd, ShaggyPE, to what end?
A problem well stated is a problem half solved:)
Regards,
Mike
RE: Meta to metal face seal
* relative to a diffusion-bonded bare steel joint.
RE: Meta to metal face seal
RE: Meta to metal face seal
Could you copper plate one or both of the mating surfaces thick enough to act as a gasket? Quick Google search suggested you could get at least .015" thick in the correct situation.
You might even be able to put a gold layer on top of this to address the diffusion bonding issue.
(Please note, I'm completely pulling this out of my a$$ and haven't thought it through or researched it at all.)
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Meta to metal face seal
RE: Meta to metal face seal
Bonding not an issue
RE: Meta to metal face seal
RE: Meta to metal face seal
RE: Meta to metal face seal
I wondered how you were going to get the fasteners to hold in mercury at those temps but let it slide.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Meta to metal face seal
Thanks everyone.
RE: Meta to metal face seal
RE: Meta to metal face seal
Please note that you cannot call your flange connection metal-to-metal contact flange connection in case the metal-to-metal contact is not maintained during installation and tightening. I suggest you go through the following threads to understand:
http://www.eng-tips.com/viewthread.cfm?qid=313354
http://www.eng-tips.com/viewthread.cfm?qid=313472
Hope it helps.
Ibrahim Demir
RE: Meta to metal face seal
*Copper o-rings were actually partially etched from contiguous copper shim. Multiple separate copper o-rings were too difficult and failed too often.
Metal bonding was not much of an issue, localized rusting of the stainless steel due to intimate copper contact was an issue.
Parts of this are patented.