For what ever it's worth, here is my 2cm worth on sway struts/ isolation
dampeners.
On a rod/clevis supported line, place angle iron between rods just above the clevis and double nut (top/bottom) it on each rod, place soft rubber washers between angle and nuts, this stops much of the axial movement and also is the start of vibration dampening. Approx. every 20'-40' (depends on what seismic zone you are in), anchor with more angle, perpendicular to the axial angle, either to a wall, or cantilever to the floor/roof support steel. Make the perpendicular support, bolted connections and also isolate these with soft rubber washers.
Now that you have almost all sway stopped, place a piece of Armorflex with a 10ga. shield between pipe and clevis and you have completed your isolation dampening. With cryogenic systems, I'll use wood blocks, but I glue a piece of thin armorflex to both sides if I'm really concerned about vibration. I've always viewed vendor bought isolation dampeners of any type as for those that have lots of money, or for someone having to live with silly specs.
CMR
>
>
> we've previously used AAA Technology and Specialties Co. Inc based
> in Houston, TX and Power Piping Company based in Pittsburg, PA for our
> requirements for molded polyurethane pipe saddles and supports in cold and
> cryo service. The use of wooden block in lieu of high density pu is a cost
> effective alternatives (works OK with us).
>
> on the same subject, there was a previous threads requesting for
> info on sway braces. what was posted was a rigid hanger assembly using an
> adjustable clevis type hangers with a braces mounted on the clevis. I dont
> think that this will work. For sway braces to dampen the effect of
vibration
> i would suggest of spring loaded vibration dampeners mounted to a double
> bolted clamp or the use of sawy struts in v-fromation as a cheaper
> alterntive. Power Piping catalog has a lot of this type of products.
> _________________________________________
>
> > Polyurethane Components for Pipe Supports
> > Piping Technology and Products
> >
> > <<The combination of strength to support loads and thermal
> > insulation made rigid polyurethane foam an attractive material for
> > the cryogenic pipe supports required for major LNG facilities
> > constructed in the 1970's.>>
> >
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Received on Thu Aug 09 21:45:00 2001
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