Page 29 - Design Criteria.qxd

30 ® Welcome to the Next Generation of Sealing Technology
Flexpro Gasket Materials
Metallic Core Materials Soft Facing Materials
Type 316L SS Carbon Steel Hastelloy C276 Flexicarb
Type 304 SS Monel Aluminum Thermiculite 845
Type 309 SS Inconel 600 Copper Compressed Fiber
Type 310 SS Inconel 625 Brass PTFE
Type 317L SS Inconel X-750 Nickel 200 Sigma
Type 321 SS Incoloy 800 Alloy 20 Soft Metals
Type 347 SS Incoloy 825 Duplex
Type 430 SS Hastelloy B2 Titanium
Flexpro™ Gaskets
The Flexpro (formerly known as the Kammprofile) gasket offers a safe, effective seal under the
most severe operating conditions on both standard pipework and special applications.
The Flexpro gasket offers excellent flexibility and recovery characteristics, allowing seal
integrity under pressure and temperature fluctuations, temperature differential across the flange
face, flange rotation, bolt stress relaxation and creep.
The Flexpro is a two part assembly, consisting of a precision serrated metallic core with
the addition of soft gasket sealing materials bonded to each face. The soft gasket sealing mate-
rial provides initial low stress gasket seating, while the serrated geometry of the metallic core
enhances sealing performance by means of inducing stress concentration on the sealing layers,
containing these sealing faces within the radial grooves. This minimizes lateral flow and ensures
the applied load is confined upon the gasket sealing faces. A further function of the metallic core
is to provide exceptional gasket rigidity and blow out resistance, as well as offering an integral compression stop. Flexpro gaskets are
suitable for Class 150 to 2500 service.
As standard, graphite is the preferred sealing face material, due to its excellent stability and flow characteristics. Other soft fac-
ing materials available are Thermiculite, PTFE, Sigma, Non-asbestos fiber, and soft metals. The metallic core must be selected to suit
the application design conditions and the media to be sealed, with both chemical resistance properties and temperature stability char-
acteristics taken into account.
A full range of metallic core materials are available, from the relatively low cost carbon steels, through the range of stainless
steels up to the "exotic" alloys. 316 L material is considered standard. For a full listing, please refer to the table below.
Flexpro gaskets are available for non standard flange applications such as heat exchangers, pumps, and valves. For heat
exchanger applications, Flexpro gaskets can be designed to suit TEMA male and female flange arrangements as well as tongue and
groove flanges requiring any type of pass bar configuration.
The Flexpro gasket is available with two types of serrated core profiles: the DIN profile and the standard (Shallow) profile.
Style PN
Style PN Flexpro gaskets are selected
for use in confined locations, including
male and female, tongue and groove,
and recessed flange arrangements.
Style ZG
Variation of the PN Flexpro, utilizing
an integral outer locating ring for cor-
rect gasket positioning within the mat-
ing flange bolt circle. Style ZG Flexpro
gaskets are recommended for use on
standard raised face and flat face flange
assemblies.
Style ZA
The Style ZA Flexpro is a slight variation
of the Style ZG. The integral outer locat-
ing ring is replaced by a loose fitting
independent ring which is preferred
where flange differential radial thermal
expansion may be encountered. These
rings may also be spot welded.