SPIRAL WOUND GASKETS

Garlock CONTROLLED DENSITY™ Gaskets

Controlled Density Gasket

Benefits

Superior performance
  • Computerized manufacturing process ensures optimum filler density is constant across gasket winding for consistent compression and superior sealability
  • High tightness level achieved with minimal compressive load, for longer-lasting seal
Unequaled reliability
  • All 150 and 300 lb. class flexible graphite-filled gaskets now incorporate CONTROLLED DENSITY technology
  • Tight tolerance on gasket ID and OD ensures a reliable seal


Gasket Style and Material Gasket Factor
"M"		 Gasket Factor
"Y" (psi)
Traditional spiral wound gasket—
304 SS and flexible graphite		 3.00 10,000
Garlock CONTROLLED DENSITY™ spiral wound gasket 3.00 7,500


ROTT Test and Results

ROTT Test

  • Purpose: Determine room temperature sealing capabilities, by measuring the sealability of a gasket at incremental gasket stress values
  • Sample used: Two 304 SS and flexible graphite-filled 4" Class 150 ASME B16.20 CONTROLLED DENSITY spiral wound gaskets
  • Procedure: The leak rate is measured during the loading and unloading cycles, and a tightness curve is generated.*


Test Results

  • When compared with other spiral wound gaskets, the CONTROLLED DENSITY gasket was able to achieve equivalent tightness at a lower load in all tightness parameter values.
  • During stress cycling, the performance of CONTROLLED DENSITY gaskets was excellent, compared with other spiral wound gaskets.



Comparison of Seating Requirements

Gasket Material Gasket Constant Gb (psi) Gasket Constant 'a' Gasket Constant Gs (psi) Stress Req'd for Tightness of 100 (psi) Stress Req'd for Tightness of 1,000 (psi) Stress Req'd for Tightness of 10,000 (psi)
Garlock CONTROLLED DENSITY™ flexible graphite-filled spiral wound gasket (ASME B16.20) 627 0.35 6.22 3,140 7,040 11,430
Flexible graphite spiral wound gasket 2,300 0.237 13 6,851 11,823 20,405
PTFE-filled spiral wound gasket 4,500 0.14 70 8,575 11,836 16,339
Foil-reinforced flexible graphite sheet 816 0.377 0.066 4,631 11,033 26,284
Garlock GRAPHONIC® gasket 922 0.248 5.1 2,889 5,114 9,052
"Low stress" spiral wound type gasket, flexible graphite filled 598 0.385 0.03 3,520 8,540 14,570
Garlock Kammprofile gasket 368 0.4 0.28 2,324 5,838 14,664

* Gb = stress at which seal is initiated; "a" = the slope of the log/log tightness curve; Gs = intersection of the unload curve with the vertical axis (Tp1)

Note: For a 5" OD gasket at 800 psig, Tp100 = 102ml / min. leakage, Tp1,000 = 1.02ml / min. leakage, Tp10,000 = 0.01 ml / min. leakage.


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.



Copyright © Garlock Sealing Technologies

 

Back to Metallic Gaskets