FLEXIBLE GRAPHITE RINGS AND SEALS - Technetics Group Graphite_ENG_2016_low res.pdf · FLEXIBLE GRAPHITE RINGS AND SEALS ... ** products from the GARLOCK family of companies (EnPro

Sealing solution for your static and semi-dynamic applications

FLEXIBLE GRAPHITE RINGS AND SEALSORIGRAF® EXPANDED GRAPHITE SEALSCEFIGRAF® CUT GASKETSFARGRAF® PACKING

SELECTION GUIDE FOR GRAPHITE SEALS: SUMMARY TABLE OF PRODUCTS ACCORDING TO THE FOLLOWING CRITERIA

Selection guide Static applications Semi-dynamic

applications

CEFIGRAF®, GRAPH-

LOCK® cut gaskets

(**)

CEFIGRAF® HP

cut gaskets

VITAFLEX®

spiral wound

gaskets(*)

VITAFLEX® BPA

spiral wound

gaskets (*)

Graphite coated

serratedseal

CEFIGRAF® JPR seals

CEFIGRAF® JDG seals

ORIGRAF®

sealsAutoclave

sealsLaminated seals

Pressure(*):

- Low pressure (up to 5 MPa)

- Medium pressure (up to 10 MPa)

- High pressure up to 35 MPa

up to 40 MPa

up to 20 MPa

up to 60 MPa

up to 60 MPa

Metal-metal contact upon request

following types

High elastic recovery requirements

Shaped seals

Large dimension monobloc seal (over 1500mm)

Ease of handling (no risk of damage)

Tightening optimization

Thermal transitions

Certifications:- Fire safety

- Fugitive emissions

- PMUC

- BAM

- TOTAL

* refer to specific product specifications

** products from the GARLOCK family of companies (EnPro Industries)

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[email protected] technetics.com

TECHNETICS GROUPEnPro Industries companies

90, rue de la Roche du Geai CS 52913 42029 Saint Etienne cedex 1 FRANCE

2

Thanks to its structure, which provides it with the remarkable

properties described below, the primary use for flexible

graphite is in the sealing sector.

Compressibility: Flexible graphite can be compressed to a

maximum density limit of 2.25 (ratio between mass & volume).

The choice of initial densification is a major factor in the

optimization of the final product’s characteristics.

Resiliency: Flexible graphite has a capacity for resiliency of

about 10% in volume, making it possible to maintain seal

performance over a broad temperature range.

Creep/relaxation: Flexible graphite has a very low creep

rate in its service temperature range and holds up to high

pressures.

Temperature resistance: In a reducing or inert atmosphere,

flexible graphite retains its characteristics over a broad range

of temperatures, from -196°C to 2500°C (-320.8°F to 4532°F)

(sublimation temperature = 3500°C/6332°F). In the presence

of oxygen, graphite forms CO or CO2 from 500°C to 550°C

(932°F to 1022°F) upwards for high temperature grades. The

speed of oxidation depends on the surface in contact with the

oxidant object.

Aging: Flexible graphite is one of the non-metallic materials

that is least affected by aging. This property is not influenced

by temperature.

Radiation performance: Flexible graphite resists aging from

high levels of radiation: no visible effect at 10-22 neutron/cm2.

Chemical inertness: Flexible graphite, which contains no

binders, withstands most chemicals, such as mineral acids and

solvents.

Lubrication: Flexible graphite is self-lubricating and has a low

coefficient of friction (less than 0.10 with steel).

Processing: Flexible graphite is easy to cut using conventional

manufacturing equipment/techniques.

Removability: Flexible graphite adheres very little on sealing

surfaces.

10 REASONS TO USE FLEXIBLE GRAPHITE

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3

DIFFERENT GRAPHITE GRADES

Technetics Group flexible graphite seals can be manufactured using different grades of graphite which meet application

requirements in the nuclear, oil & gas, valves, and industrial applications.

Grade Pure material Material with inhibitors PMUC Material

Technetics Group Material Grade

I N IP NP NS 200 NS 100

Standard grade for industrial applications

High purity grade for specific

applications

Grade with corrosion inhibitor

Grade with oxidation inhibitor

EDF qualified-grade for nuclear

applications

Nuclear grade with sulphur rate

below 100ppm (upon request)

Carbon rate without inhibitor (%)

> 98 > 99.8 > 98 > 99.8 > 99.5 > 99.5

Ash rate (%) < 2 < 0.2 < 2 < 0.2 < 0.5 < 0.5

Inhibitor rate 0 0 1 to 3 1 to 3 0 0

Chloride content in PPM

≤50 ≤30 ≤50 ≤30Sulphur ≤200Chloride ≤30Halogens ≤80

Sulphur ≤100Chloride ≤30Halogens ≤80

Temperature resistance in oxidizing atmosphere °C/°F

500°C932°F

500°C932°F

550°C1022°F

550°C1022°F

500°C932°F

500°C932°F

Additional options available upon request.

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4

TRANSFORMATION OF GRAPHITE

STATIC SEALING

Laminated seal (pg. 15)

(*) products from the GARLOCK family of companies (EnPro Industries)

(**) see specific product specifications

ORIGRAF® seals for autoclave

closings (pg. 14)

Expanded graphite rings

FARGRAF®

STATIC SEALING SEALS AND RINGS

ROLLS AND SHEETS

• Without reinforcement

• Nickel reinforced

• Stainless steel reinforced (ATI)

• Reinforced with GRAPH-LOCK® 3125 (*)

• Multilayer

• Thickness 0.4 to 5mm (.016 to .197 in)

Without

reinforcement or

with reinforcement

SHEETS

Cut gasket

Cut gasket with setting

CEFIGRAF® JPR (pg. 13)

CEFIGRAF® JDG (pg. 12)

Camprofile

Rubber metal

Traditional coated gasket:

SEMI-DYNAMIC SEALROLLER

• Without reinforcement

• With corrosion / oxidation inhibitor

• Density 0.7 to 1.1

• Thickness 0.2 to 0.5 mm (.008 to .020 in)

ORIGRAF® expanded (pg. 7)Strips

Notched or non-notched

VITAFLEX® spiral wound gaskets with graphite filling (**)

Corrugated

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5

SHEETS AND CUT GASKETS

The sheets of flexible graphite are created from the different grades already described, with or without reinforcement. This rigid

reinforcement makes it easier to manipulate them.

Production possibilities / dimensional limits: Technetics Group can produce all dimensions, simple or complex shapes, intended

for sealing flanges, gland, etc. For dimensions above those of the sheets or the rollers, the seals can be made in different parts

(i.e. dove tail).

Graphite Designations - Product Specifications Characteristics

Sheet Formats Material Thickness

mm in

In Stock Upon request

mm in mm in

CEFIGRAF® NAI(without reinforcement)

Ref No. 917-10

• Non-reinforced graphite • Industrial grade • Graphite 98%

500 x 1000 19.7 x 39.4 0.4 .016

1000 x 1000 39.4 x 39.40.8 - 1 1.5 - 2

.019 - .039

.059 - .0792.5 .098

CEFIGRAF® ATN(with nickel reinforced sheet)

Ref No. 917-14

• Non-reinforced graphite • Industrial grade • Graphite 98%

500 x 1000 19.7 x 39.40.8 - 1 1.5 - 2

.019 - .039

.059 - .079

GRAPH-LOCK® 3125 SS (AA) (*)Single layer

(blue marking)Ref No. 917-44

• Single layer graphite with stainless steel insert

• Industrial grade 98%• Blue marking with anti-

adhesive treatment

1500 X 1500

59.1 x 59.1 1 - 2 .039 - .0791.5 3 4

.059

.118

.157

GRAPH-LOCK® 3125 SS (AA) (*)Multilayered(red marking)

Ref No. 917-57

• Multilayer graphite with stainless steel insert

• Industrial grade 98%• Red marking with anti-

adhesive treatment

1500 X 1500

59.1 x 59.1 2 - 3 .079 - .1181

1.5 4

.039

.059

.157

GRAPH-LOCK® 3125 TC (AA) (*)(white marking)Ref No. 917-34

• Single layer graphite with perforated stainless steel insert

• Industrial grade 98%• White marking with anti-

adhesive treatment

1500 X 1500

59.1 x 59.1 2 - 3 .079 - .118 1.5 .059

CEFIGRAF® NS 200 PMUC No. 17-0172 FT No. 918-04

• Non-reinforced graphite • High purity 99.5% grade

graphite, approved by EDF, PMUC (sulphur and halogen rate < 200ppm)

700 X 1000 27.6 x 39.4 1.5 - 3 .059 - .1181 - 23 - 4

5

.039 - .079.118- .157

.197

1000 x 1000 39.4 x 39.4 2 .079

CEFIGRAF® NS 200 HPPMUC No. 17-0189 FT No. 918-09

• Multilayer graphite with stainless steel insert

• High purity 99.5% grade graphite, approved by EDF, PMUC (sulphur and halogen rate < 200ppm)

1000 x 1000 39.4 x 39.4 2 - 3 .079 - .1181- 1.5

4.039 - .059

.157

1500 x 1500 59.1 x 59.11 - 1.5 2 - 3

4

.039 - .059

.079 - .118.157

*The above products are from the registered trademark of the GARLOCK family of companies (EnPro Industries)

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6

ORIGRAF® SEALS

CONCEPT AND ADVANTAGES OF ORIGRAF® SEALS

Recommendations for useThe ORIGRAF®, an expanded graphite seal, is created

from strips of CEFIGRAF® flexible graphite, densified under

pressure using special equipment. The seal is obtained through the final densification of the seal when it is tightened in contact with the mechanical stop (also known as metal-metal contact).

The metal-metal contact is obtained:

• either by assembling a graphite ring in a groove

• or by the insertion of a graphite ring between interior

and/or exterior rings which serve as tightening

limitations.

Advantages of metal-metal contact: it consists of creating

a rigid mechanical contact independent of the active part

of the graphite seal which is thus preserved against the

general mechanical assembly constraints. The resiliency of the seal only serves the sealing function. This metal to metal concept also allows the seal to be protected from over-tightening.

ORIGRAF® seal with anti-extrusion cupsORIGRAF® seals can be equipped with anti-extrusion cups. These make it possible to avoid the extrusion of graphite during the tightening phase, ensuring a targeted densification. This concept (patented system) is

recommended in the following cases:

• high pressure

• large space between metallic assembly parts

• highly corrosive fluids or fluids with high levels

of impurities, to protect the center of the seal

The cups are made using Stainless steel (316L, 304L, etc.) or

in Monel, Inconel or Silver upon request.

MAIN ADVANTAGES OF ORIGRAF® SEALS

• Excellent elastic recovery, capable of reaching 50%

of compression.

• Very good endurance in thermal transients• No marks on the sealing surfaces, making maintenance

easier when opening the flanges and replacing the seal

• Good resistance to radial movements of the flanges• Excellent ability to withstand a wide range of

temperatures: -196°C to +2500°C ( -320.8°F to +4532°F)

(in an inert environment and according to the assembly

conditions)

• Fire resistant

• Very low level of relaxation (6 to 8% max.)

AREA OF USE

Max. temp. in oxidizing environment

500°C/932°F (550°C/1022°F with corrosion inhibitor)

Max. temp. in inert environment

2500°C/4532°F in inert environment

Min. temp. -196°C/-320.8°F

Max. pressure 15 MPa

State of opening surfaces See user recommendations

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7

TYPE OF ORIGRAF® SEAL Design possibilitiesORIGRAF® seal without cups (type ON 000):

• Minimum thickness possible 2 mm (.079 in)

• Internal Ø min. 2 mm (.079 in)

• External Ø max. 1500 mm (59.055 in) (for larger

dimensions, please contact us)

• Tooling library: over 2500 diesSINGLE STRIP

ORIGRAF® SEAL TYPE

ORIGRAF®

DOUBLE STRIP

TRIANGULAR

SPECIAL

NB

N

D

T

S

0

1

2

3

4

: WITHOUT: WITHOUT : WITHOUT

double

double: exterior with centering

single interior

single exterior

single exterior with centering on connector

: 1

: 2

: 3

: 4

NB

XO X X X

NBCup positionCup Ring (limiter or support)

10-9

0 20 50 80 110 150

10-8

10-7

10-6

10-5

10-4

10-3

Gas flow = f (surface pressure)

Surface pressure in Mpa (PY0)

Gas fl

ow P

a.m

3.s-

1 /m in

circ

umfe

renc

e

tightening

PA Seatingpressure

PA

ru

rt

The curve represents the helium gas flow for a delta P of 1 bar depending on

the seating pressure.

PA: seating pressure for obtaining metal-metal contact ru: useful elastic recovery (max. diversion of seal for maintaining sealing)

rt: total elastic restitution (total decompression of the seal)

TECHNICAL CHARACTERISTICS• Compression rate: ORIGRAF® seals are designed with a total compression rate of between 12 and 20%, depending on the initial

density of the graphite.

• Seating pressure: numerous tests on the characterization of the ORIGRAF® seals have made it possible to master the essential

settings linked to the seal's performance. This enables us to retain a seating nominal pressure of 3.5 to 5 MPa for the majority

of applications.

• Gas tightness curve:

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8

TYPES OF ASSEMBLY

Standard assembly The most common types of seal Seal description

Grooved assembly ON 000

Seal composed of a single graphite ring

ON 250Seal composed of a graphite ring and 2 anti-extrusion cups

(to be placed on the opposite side to the groove base)

Assembly on flat surfaced or elevated flanges ON 002Seal composed of a graphite ring and 2 metal internal

and external rings

ON 492

Same as ON 002 with 4 anti-extrusion cups

Single insertion assembly on flange ON 242

Same as ON 002 with 2 internal anti-extrusion cups

Specific assembly methods

Double strip sealing assembly OD 492

Seal composed of 2 graphite rings and 3 metal internal, external and intermediate rings, with 4 anti-

extrusion cups and double strips

Specific forms ON 000

Shaped seals composed of a single graphite ring in a specific shape

Assembly of exhaust flange ON 002

Seal composed of one graphite ring and 2 metal internal and external rings, with the external

ring having a specific design

Electric boiler sealing ROTAGRAF®

Set of two gaskets, each composed of one triangular graphite ring with anti-extrusion cups

D0D1D2D3

BA

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9

ORIGRAF® GASKETS FOR GROOVE ASSEMBLY

• Gasket dimensions and tolerances:

F

E

r: 0.1 to 0.15

F

E

r: 0.1 to 0.15

lo

eo

PYol

g D

The dimensioning of grooves has a direct impact on the sitting pressure to be developed on the seal in order to obtain

the metal-metal contact. The chart below shows the influence of groove tolerances on the precision of the sitting pressure (PYo)

defined for a seal with initial section Io x eo.

Technetics Group Recommendations

GROOVE SIZES HOUSING (D) Seal Section Io x eo (mm2)

g I25 50 100

mm inch mm inch

±0.05 ±.002±0.05

+0±.002 PYo ± 20% PYo ± 15% PYo ± 10%

±0.05 ±.002±0.10

+0±.004 PYo ± 25% PYo ± 20% PYo ± 15%

±0.10 ±.004±0.20

+0±.079 PYo ± 50% PYo ± 30% PYo ± 25%

• Groove dimensions:

A = seal inner diameterB= seal outer diameterC= seal depth

D= groove depthE = groove inner diameterF= groove outer diameter

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10

ORIGRAF® GASKETS FOR STANDARDIZED FLANGES

ORIGRAF® ON 002 gaskets have been designed for

adaption to flat surfaced flanges (type FF) or raised flanges

(type RF) and single insertion (type SE), following flange

standards NF-EN 1092-1 and NF-EN 1759-1 (ASME/ANSI B16-5).

Gaskets with specific dimensions have been defined for

each type of flange (please contact us).

USAGE RECOMMENDATIONS

• Surface condition of the contact areas:

- rounded surfaces: the contact areas must have a flat

surface made up of either:

Ra=0.8 to 12.5 µm for circular seals

(recommended Ra = 1.6 to 6.3 µm)

Ra= 0.4 to 1.6 µm for shaped seals

(recommended Ra=0.8 µm)

• Assembly/disassembly:

- ORIGRAF® gaskets in groove assembly:

- During assembly, it is recommended to take

precautions to avoid causing any damage to

the seal at its introduction into the groove

(scratching off the graphite, etc.).

- For ORIGRAF® type ON 250 seals, be careful with

the placement during assembly, the cups must

be positioned on the opposite side to the base

of the groove.

- During disassembly, it is recommended to take

precautions so as to remove the seal without

altering the depth of the groove (use non-

metallic tools, preferably fiber, and if possible

remove the gasket without tools)

- ORIGRAF® gaskets with limiter:

- No particular precautions are required during

assembly. It is however necessary to avoid any

risk of causing damage to the sealing strip on the

flange, such as cuts, scratches, or foreign bodies.

APPLICATION AREAS FOR ORIGRAF® SEALS

• steam generator, pressurizer

• shut off valves, adjustment and regulation in linear

movement, and quarter rotation

• heat exchanger

• piping connecting flange and boiler devices

• piping shutters

• rotating machinery: interior of pumps and compressors

• device closings with autoclave systems

• hot air and other gas circuit

• cryogenic applications

CERTIFICATIONS

The ORIGRAF® seal is PMUC certified by EDF (No. PMUC

17-0174) and BAM.

The ORIGRAF® seal can be made using materials (metal

rings) obtained following RCCM.

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11

CEFIGRAF® JDG SEALS

CEFIGRAF® JDG SEAL CONCEPT

The CEFIGRAF® JDG seal (cut grooved gasket) is made of a metallic support on which sheets of graphite are inserted into machined grooves. The seal is obtained

through the final densification of the graphite when it is

tightened in contact with the mechanical stop (also known as metal-metal contact).

MAIN ADVANTAGES OF CEFIGRAF ® JDG SEAL

• Advantages of metal-metal contact: it consists of

creating a rigid mechanical contact independent of the

active part of the graphite gasket which is thus preserved

against the general mechanical assembly constraints.

The seal's elastic recovery is thus entirely dedicated to

the conservation of the seal. This concept also allows

the seal to be protected from over-tightening.

• No creep, as the graphite is assembled in the groove• The precise machining of the groove makes it possible

to perfectly control the seating pressure on the seal and the densification of the graphite, avoiding all risk of

overweighting

• Monobloc seal, easy to manipulate (no risk of

breakage during manipulation)

• Good sealing due to graphite's expansion

• Very good endurance in terms of thermal transitions

AREA OF USE

(* non associated values)

The maximum conditions for use depend on a number of

parameters, notably the diameter of the seal and the type

of assembly (assembly in a groove or between flat surface

flanges).

CREATION POSSIBILITIES

• Standard: Stainless steel, other metals upon request.

• Possibility of standard flange seals (NF EN

1092-1 - ASME B16.5)

• Shapes: circular, rectangular, elliptic, double strip

and in bars.

Possibility of manufacturing different thicknesses,

depending on the thickness of the components.

TECHNICAL CHARACTERISTICS

• Compression rate: CEFIGRAF® seals are designed with

a total compression rate of between 40 and 50%,

depending on the initial density of the graphite.

• Seating pressure: numerous characterization tests

on the CEFIGRAF® JDG seal have made it possible to

identify the key parameters linked to the performance

of this seal. These make it possible to retain a nominal

sitting pressure of 30 and 50 MPa, for the majority of

applications.

PY0

Metal-metal contact

Sitting pressure MPa

Rated sitting pressure

Tightening

APPLICATION AREAS

• Nuclear: exchangers and openings in manual

tools, valves

• Chemical: exchangers (gaskets with bars), saturated and

heated vapor, hydrocarbons

• Valves: body/bonnet

CERTIFICATIONS

• Option of manufacture with PMUC graphite

(EDF certification No. 17-0172)

INSERTION ASSEMBLY

ASSEMBLY ON FLAT OR ELEVATED SURFACE

Max. continuous temp.

500°C/932°F in oxidizing atmosphere *

Min. temp. -196°C/-320.8°F

Max. pressure 20 MPa *

Roughness of the sealing area

Ra: 1.6 to 12.5 μm (turned surfaces

by lath machining)

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12

CEFIGRAF® JPR SEALS

CEFIGRAF® JPR SEAL CONCEPT

The CEFIGRAF® JPR (flat covered gasket) seal consists of

a metal core on which two graphite CEFIGRAF® sheets are attached.

MAIN ADVANTAGES OF CEFIGRAF® JPR SEALS

• Monobloc seal, easy to manipulate (no risk of

breakage during manipulation)

• Particularly adapted to the creation of complex shaped seals and large dimension seals

• Good capacity to compensate for surface defects of the

contact areas (graphite thickness 1 mm)

• Good sealing due to graphite's expansion

• Low creep (low graphite thickness)

• Possibility of "optimized" seals• Adaptation of the graphite strip cross section to the

effort available in the nuts and bolts• Replacement of existing flat large section seals

without modification to the closing or the bolt (dimensions above all identical to the original seal,

optimization of the width of the graphite part

depending on available effort)

AREA OF USE



Min. temp. -196°C/-320.8°F


Roughness of the sealing areas

Ra: 1.6 to 12.5 μm (turned

surfaces by lath machining)


The maximum conditions for use depend on a number

of parameters, notably the diameter of the seal and the

type of assembly (assembly in a groove or between flat

surface flanges).

For use at > 40 bar and for seals of DN > 500, contact us in

order to optimize the seal definition.


• Possibility of manufacture in different thicknesses

• Recommendations regarding graphite thickness:

- If assembly is between two machined surfaces,

graphite thickness of 0.5 mm

- If assembly is on a mechanically welded device,

graphite thickness of 1 mm

Most common designs (additional examples upon request)

Thickness Gasket (mm) Thickness Stainless steel (mm) Thickness Graphite (mm)

2 1 0.5

3 2 0.5

3 1 1

4 2 1

TECHNICAL CHARACTERISTICS

Compressibility (ASTM F36) * 40-50% of the graphite thickness

Elastic recovery (ASTM F36) * 10-15% of the graphite thickness

(* trial with graphite sheet with 1mm thickness)

APPLICATION AREAS

• Internal equipment inspection hatches (complex

shaped gaskets)

• Exchangers (seals with or without bars)

• Flange seals up to PN40

• Large dimension seals for various uses (turbines, etc.)

CERTIFICATIONS

• The CEFIGRAF® JPR seal is PMUC certified by EDF

(No. PMUC 17-0280)

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13

ORIGRAF® SEALS FOR AUTOCLAVE CLOSURE HEADS

CONCEPT

The principal of this method of closing is to use pressure

to push the autoclave plug and to compress the graphite

radially in the bore of the valve body. The more the pressure

increases, the more the seal is compressed.

There are several types of ORIGRAF® seals for autoclave

closings which can be made up of metal rings (stainless steel,

steel, or other upon request) and molded graphite rings

(straight or cone-shapes) which ensure radial sealing in the

body of the valve as well as on the right of the autoclave plug.

MAIN ADVANTAGES

• No corrosion problems with the STELLITE® deposit

from the device due to the purity of its PMUC grade

graphite (carbon level >99.5%, S and H levels <200ppm)

• Good sealing due to the graphite's increased density

on this type of autoclave assembly

• Good temperature resistance as the mechanical

properties of graphite remain relatively unchanged in

high temperatures

• Good resistance over time due to very low creep• Good capacity to compensate for surface defects of

the contact areas (barrel and plug)

AREA OF USE



Manufacturing possibilities range from DN 80 to DN 600.

All metal materials are available upon request.

MOST COMMON DESIGNS

APPLICATION AREAS

• Sanitary fitting devices with autoclave closings

• Autoclave closing on various devices: heaters, tanks, etc.

• Energy production (nuclear and thermal plants)

and petrochemical

CERTIFICATIONS

• The ORIGRAF® JPR seal is PMUC certified by EDF

(No. PMUC 17-0174)

Seal type Description Characteristics

OT007

Seal comprised of metal rings

(stainless steel, steel or other upon specific

request) and molded

graphite rings

• Metal-metal contact

• Replacement of main metallic seals without altering the assembly

• Replacement of seal openings damaged by the original seal not necessary, seal on the intact parts of the valve

0T280

Triangular graphite seal with

anti-extrusion cups

• Nonmetal-metal concept

• Limited creep

Set ON000 + ON110 + ON250

Assembly of ORIGRAF® seals ON000, ON110

and ON250

• Metal-metal contact system

• Limited creep

ON290

Anti-extrusion bowl cup system

above/below

• Seal in one piece• Limited creep• Low obstruction



Min. temp. -196°C/-320.8°F


Roughness of the sealing areas

Ra: 1.6 to 12.5 μm (turned

surfaces by lath machining)

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14

Maestral: THE LABORATORY THAT USES SCIENCE TO SERVE SEALING

Maestral offers a multi-scale scientific approach combining tests, characterization and simulation in order to develop sealing solutions that meet present and future needs. Maestral brings together the strengths of Technetics Group, leader in the field of high performance industrial sealing and CEA (French Atomic Energy and Alternative Energy Agency), a major player in research and innovative developments for energy technologies.

Maestral's expertise is the result of a successful collaboration, since 1969 between CEA and Technetics Group. Our skill is constantly growing as a result of the real-life cases we study and our experts have the ability to quickly assess situations in order to offer suitable R&D programs and solutions. Maestral technicians are experienced and certified to COFREND (French Confederation for Non-destructive Testing) II, Leak Testing. Maestral has the latest generation of test and characterisation equipment, offering the ability to quickly and thoroughly analyze the behavior of seals. Simulation does not replace tests on mock-ups but it allows the latter as well as experimental artifacts to be reduced. Simulation is an efficient tool for conceiving and optimizing a sealing system by checking its performance in all circumstances, in order to best respond to clients' issues.

Today, prediction abilities of models are advanced enough to extrapolate life-size results when the size of the mock-ups or the duration of the tests makes them impossible in real conditions. Our FEA engineers are particularly experienced in the mechanics of largely non-linear behaviors, such as deformations, creep, complex contacts with flanges and friction. Maestral is committed to actively developing numerical simulation tools and resources, applied to sealing. In order to develop product lines or for special applications, Maestral designs and develops specific benches or mock-ups reproducing actual operating conditions. To do so, it calls on the advanced analytical skills of CEA and on the manufacturing and research abilities of Technetics Group.

Calculation for finished elements

LAMINATED SEALS

The laminated seal is a sealing solution for valve seat applications in triple offset butterfly valves.



Min. temp. -196°C/-320.8°F


AREA OF USE


CONCEPT AND ADVANTAGES• Technetics provides its clients a complete sealing solution, including the

laminated seal along with its secondary seal in order to optimize the sealing in

line with the valve and to achieve the most restrictive test classes (ANSI Class VI).

• Overlay of metal and graphite rings unified with a specific adhesive process.

• Machining of the sealing area according to an elliptical profile.

• Graphite provides a slight lateral displacement of the rings from one another,

enabling them to adjust perfectly to the seat opening. Several graphite densities

and thicknesses are available based on the characteristics to be obtained.

• The purpose of the second seal is to prevent the laminated seal being bypassed

by the fluid. The optimal solution consists of combining a laminated seal with

a secondary molded ORIGRAF® seal with cups (see pg. 7), providing excellent

elastic recovery, while preventing any risk of graphite extrusion and under-

densification of the material.

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15

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16

THE TECHNICAL DATA CONTAINED HEREIN IS BY WAY OF EXAMPLE AND SHOULD NOT BE RELIED ON FOR ANY SPECIFIC APPLICATION. TECHNETICS GROUP WILL BE PLEASED TO PROVIDE SPECIFIC TECHNICAL DATA OR SPECIFICATIONS WITH RESPECT TO ANY CUSTOMER’S PARTICULAR APPLICATIONS. USE OF THE TECHNICAL DATA OR SPECIFICATIONS CONTAINED HEREIN WITHOUT THE EXPRESS WRITTEN APPROVAL OF TECHNETICS GROUP IS AT USER’S RISK AND TECHNETICS GROUP EXPRESSLY DISCLAIMS RESPONSIBILITY FOR SUCH USE AND THE SITUATIONS WHICH MAY RESULT THEREFROM.

TECHNETICS GROUP MAKES NO WARRANTY, EXPRESS OR IMPLIED, THAT UTILIZATION OF THE TECHNOLOGY OR PRODUCTS DISCLOSED HEREIN WILL NOT INFRINGE ANY INDUSTRIAL OR INTELLECTUAL PROPERTY RIGHTS OF THIRD PARTIES.

TECHNETICS GROUP IS CONSTANTLY INVOLVED IN ENGINEERING AND DEVELOPMENT. ACCORDINGLY, TECHNETICS GROUP RESERVES THE RIGHT TO MODIFY, AT ANY TIME, THE TECHNOLOGY AND PRODUCT SPECIFICATIONS CONTAINED HEREIN.

ALL TECHNICAL DATA, SPECIFICATIONS AND OTHER INFORMATION CONTAINED HEREIN IS DEEMED TO BE THE PROPRIETARY INTELLECTUAL PROPERTY OF TECHNETICS GROUP. NO REPRODUCTION, COPY OR USE THEREOF MAY BE MADE WITHOUT THE EXPRESS WRITTEN CONSENT OF TECHNETICS GROUP.

Revised December 2016 - This document replaces all previous versions

COMPANY:CONTACT:ADDRESS:

END USER:REF INQUIRY:Activity Field: Unit:Type of Apparatus: Connection:

Medium: Gas Liquid VacuumNature: SKETCH

Working Conditions:

Test:

maxThermal Shocks min

Life time:

Existing Designed To Be DefinedDimensions: Standard: Norm: ND:

PN (Lbs): Materials:BOLTS: Nb: M: Pitch:

Drill Diameter: Material:HOUSING: Existing: Changeable:

Type: Flat Face: Raised Face: (Outside Diameter of Raised Face: )Double Tongue & Groove: Single Tongue & Groove:

Other:

Groove: ID: OD : Depth:Tongue: ID: OD : Height:

Ra = µm/Wished:

Other Commercial Information: Issuer:Qty to be Quoted: Yearly Consumption: Date:

OTHERS: Other Technical Information: (For the exchangers, join a drawing of the pass partitions)

Type:Material:

Complementary Information:

Groove:Dimensions: (join a drawing with dimensions)

Surface Finish of Sealing Areas:SEAL: Primarily Used: To Be Defined:

(for non standards assemblies, join a drawing with dimensions)

To Be Defined:

ASSEMBLY

Requested sealing level:

WORKING CONDITIONS:

Pressure Temperature

N°:

DATE:INSTALLATION LOCATION:

FAX:EMAIL:

STATIC SEALS DATA SHEETTel: +33 (0) 4 77 43 51 00 Fax: +33 (0) 4 77 43 51 51

Email: [email protected]:

COMPANY:CUSTOMER:COUNTRY:

END USER:REF INQUIRY:Activity Field: WORKING CONDITIONSUnit: Speed: rpm Pressure (bar)Type of Apparatus: Constant: Suction:Reference: Variable: Discharge:Manufacturer:

MEDIUM Hours/day: min:Gas Liquid Vacuum Days/months: max:

Nature: Months/year:Requested sealing level:

PH: Viscosity: Life time:Density: % Solids:

Existing Designed To Be DefinedDimensions: Standard: Norm:Type of Assembly: Single: External: Rotating: Adjustable:

Double: Internal: Fixed: Cartridge:SHAFT METER:HOUSING: Existing: Changeable:

Diameter:Available axial space:

Compatible RINGS SECONDARY SEALSMaterials Steel: Carbon: Nitrile:

Stainless steel: Tungsten carbide: EP:Other: SiC: Viton:

AI2O3: PTFE:Other: Other:

Wished:

Other Technical Information:

Other Commercial Information: Issuer:Qty to be Quoted: Yearly Consumption: Date:

SEMI-DYNAMIC SEALS DATA SHEETTel: +33 (0) 4 77 43 51 00 Fax: +33 (0) 4 77 43 51 51

Email: [email protected]:FAX:EMAIL:DATE:INSTALLATION LOCATION:N°:

Operating Cycle Temperature (°C)

SUPPORTS/SPRINGS

ASSEMBLY

Sleeve Diameter:To Be Defined:

MECHANICAL SEAL: Primarily Used: To Be Defined:Trademark/Type:

Material:Reference of enclosed drawings:

OTHERS:



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ASIA

Blk 203, #05-52 Woodlands Avenue 9 Woodlands Spectrum 2, 738956 Singapore

Phone: +65 6759 2335 Fax: +65 6759 7319

FRANCE


Phone: +33 (0) 4 77 43 51 00 Fax: +33 (0) 4 77 43 51 51

49 Avenue Charles de Gaulle Z.I. Survaure 42607 Montbrison cedex FRANCE

Phone: +33 (0) 4 77 96 79 80

GERMANY

Falkenweg 1 41468 Neuss Germany

Phone: 0800-627-0151

UK

Acan Way, Coventry Road Narborough, Leicester LE19 2FT UK

Phone: +44 (0) 1162 727411 Fax: +44 (0) 1162 727412

USA

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Phone: +1-803-783-1880 Fax: +1-803-783-4279

305 Fentress Boulevard Daytona Beach, FL 32114 USA

Phone: +1-386-253-0628 Fax: +1-386-257-0122

1700 E. International Speedway Blvd DeLand, FL 32724 USA

Phone: +1-386-736-7373 Fax: +1-386-738-4533

1600 Industry Road Hatfield, PA 19440 USA

Phone: +1-800-618-4701 Fax: +1-215-855-3570

10633 W Little York, Bldg 3, Suite 300 Houston, TX 77041 USA

Phone: +1-713-983-4201 Fax: +1-713-466-3721

10 Old Webster Road Oxford, MA 01540 USA

Phone: +1-508-987-5900

990 Richard Avenue, Suite 117 Santa Clara, CA 95050 USA

Phone: +1-669-242-8804 Fax: +1-669-242-8492

Documents

FLEXIBLE GRAPHITE RINGS AND SEALS - Technetics Group Graphite_ENG_2016_low res.pdf · FLEXIBLE GRAPHITE RINGS AND SEALS ... ** products from the GARLOCK family of companies (EnPro