[Gasification] rope seals for really sealing?

[Rolf Uhle]

much depends on the kind of seal which is required.
Flat sealing normally applies little pressure on the gasket.
If it doesn't have tobe opened very often, many bolts distributed around the 
perimeter get better perssure on the gasket and help to prevent warping of the 
flange.
A seal in a grove with an "edge" nearly filling the grove is much better than 
a flat seal with a rope.
If you can improve the surfaces "truth" , a copper/grapite gasket as in an 
exhaust manifold is quite o.k. Needs several bolts of course.

If the opening is round and not too large and has to be serviced frequently, 
bayonet nuts or loose threaded nuts + gasket are fine. 

Rolf


Am Samstag, 27. August 2011 08:39:19 schrieb jim mason:
> do people think it possible to really get an air tight atm seal with
> fiberglass or ceramic rope as the gasket?  most boiler doors can
> tolerate a little tiny bit of leaking air, but at the base of a
> gasifier any air you let in is going to burn some of your gas.  yes,
> you can really tolerate a bit of this too, but ideally, we'd have
> absolutely zero air in.
> 
> it seems difficult to do this with regular braided rope.  maybe
> impregnating it with high temp grease is enough to make it seal.
> 
> what is the collected wisdom on door seals?
> 
> for reference, here's the basic different types of ropes available:
> http://www.mcmaster.com/#bulb-seal-gaskets/=dspae9
> 
> j
>