METAL/SPIRAL WOUND GASKETS

Engineering Data/FAQs



Recommended Flange Finish
The surface finish of a flange is described as follows:

Roughness

  • Average of peaks and valleys measured from midline of flange surface (in millionths of an inch)

  • Expressed as rms (root mean square) or AA (arithmetic average) or AARH (arithmetic average roughness height)


Lay

  • The direction of the predominant surface-roughness pattern

  • Example: multidirectional, phonographic spiral serrations, etc.


Waviness

  • The departure from overall flatness

  • Measured in thousandths or fractions of an inch



Recommended Values

Spiral Wound Gaskets................... 125-250 rms
Jacketed or Metal Clad Gaskets.... .....63-80 rms
Solid Metal Gaskets....................... .....63-80 rms


NOTE:
These values are suggested only and not mandatory; however they are based upon the best cross-section of successful design experience currently available.



WARNING:
Properties/application shown here are typical. Your specific application should not be undertaken without independent study and evaluation for suitability. For specific application recommendations consult Garlock. Failure to select the proper sealing products could result in property damage and/or serious personal injury.

Performance data published here has been developed from field testing, customer field reports and/or in-house testing.

While the utmost care has been used in compiling this information, we assume no responsibility for errors. Specifications subject to change without notice. This edition cancels all previous issues. Subject to change without notice.


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