spiral wound Gasket

[MAH82]

Hi

would somebody explain me about technical usage of spiral wound gaskets? we are using them in water cooling line with max. 10 bar pressure and max. 50 degree temprature but we have problem for leakages through the flanges.

it would be highly appreciated if somebody intruduce me a reference about design philosophy of material piping which can answer to questions like:

what's meaning flange class 300.

 

[dtn6770]

http://www.flexitallic.com/products/techsupport/design_criteria/design_criteria.htm

http://www.lamonsgasket.com/html/design.html

The two site listed above provide good information on gasket designs, including spiral wound. At one point I down loaded a “Gasket Handbook” from Lamons but I couldn’t find it on their site just now.

Your service conditions are pretty tame, relatively speaking, so you shouldn’t be having problems, with most gasket types. Check the flange gasket surfaces for gouges or other imperfections that can’t be “sealed” by the gasket. Is the flange alignment good? You may want to explore how the flange bolts are installed (sequence, torque, etc.).

As for class 300 flanges, that’s a ASME B16.5 designation. It corresponds to flanges that have specific dimensions (depending on pipe size) and pressure and temperature ratings which depend on the flange’s material of construction. That is, a NPS 3, “carbon steel” class 300 flange has the same dimension as a NPS 3, “stainless steel” class 300 flange but they may not have the same pressure and temperature ratings. Different flange classes of the same size occasionally have similar dimensions but they are different most often.

 

[pennpiper]

MAH82,
You might try the folks at this website (

http://www.garlock.net/ViewCategory?category=3)

about your problem with gaskets.


As to your question about flanges, I suggest you find someone who knows piping and ask them. You can also go to <<

http://www.pipingdesigners.com>>

and read all the data listed under TRAINING, TOOLS and STANDARDS.
There is also a FORUM on that website for piping spicific questions.

 

[dcasto]

Read the Flexitallic material. here are the things that I see are the major causes of leaks.

There should not be a problem because of the gasket, but in the installation of them. Do the flanges have a proper face on the flange, there should be a groves to cause the gasket to "grip and bind to the surface" Are you useing the gaskets more than once (I've used the same gaskets twice if it was in good shape and not in a criticle service, like water. Are the flanges sqaure? You can overtighten a flex gasket and squish it so it will not seal. Similarly, not tightening the flange evenly will cause it to slip and misalign and not seal.

 

[TGS4]

Check out ASME PCC-1 for guidance on installation of your flanged joints.