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Seal Failure Analysis

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Seal Failure Analysis

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Seal Failure Analysis

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Seal Failure Analysis

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Seal Failure Analysis

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Primary Seal

Materials

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Primary Seal Wet Seals

Primary Ring (Narrow - Softer) Materials Carbon-gra!ite

resin imregnate"

antimony imregnate"

Carbon #on$erte" to Sili#on Carbi"e

resin imregnate"

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Primary Seal Wet Seals

Primary Ring (Narrow - Softer) Materials Carbon-gra!ite

resin imregnate"

antimony imregnate"

Carbon #on$erte" to Sili#on Carbi"e

resin imregnate"

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Primary Seal Wet Seals

Carbon converted toCarbon converted to

Silicon CarbideSilicon Carbide

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Solid Silicon CarbideSolid Silicon Carbidepure sinteredpure sinteredreaction bondedreaction bonded

Tungsten CarbideTungsten Carbidenickel or cobaltnickel or cobalt

bondedbonded

Primary Seal Wet Seals

Primary Ring (Narrow - Softer) Materials Carbon-gra!ite

resin imregnate"

antimony imregnate"

Carbon #on$erte" to Sili#on Carbi"e

resin imregnate"

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Primary Seal Wet Seals

Mating Ring (Wi"e - %ar"er) Materials Cerami#

&&' aluminium o*i"e

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Mating Rings+ Cerami#

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Mating Rings+ Cerami#

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Primary Seal Wet Seals

Mating Ring (Wi"e - %ar"er) Materials Cerami#

&&' aluminium o*i"e

Sili#on Carbi"e

ure sintere" or rea#tion bon"e"

,ungsten Carbi"e

#obalt or ni#el bon"e"

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Primary Seal - .ry /as Seals

Mating Ring Materials (Rotating in ,ye 01) ,ungsten Carbi"e

Cobalt bon"e"

Ni#el bon"e" (2tional)

Sili#on Carbi"e

Pure sintere"

3i4ui" !ase sintere" - !ig! ressure (5P675P)

8.u#tile9 Mating Ring

,ungsten #arbi"e lating on stainless steel

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Mating Ring Material Sele#tion ,ungsten Carbi"e (Cobalt bon"e")

,oug!

%ig! strengt!

:est slow roll erforman#e

Cobalt bin"er #an be #!emi#ally atta#e"

Ni#el bon"e" is a$ailable - better resistan#e

Sili#on Carbi"e

%ig!ly #orrosion resistan#e

/oo" slow roll erforman#e

;ery brittle easily #!ie"

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Mating Rings

Chloride attack onChloride attack on

Tungsten CarbideTungsten Carbide

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Mating Ring Material Sele#tion

.u#tile Mating Ring Material

Ni6Cr tungsten #arbi"e on stainless steel

7'g'< =>? SS@ >6= P%@ .ule* SS

B"eal for outboar" seal ;irtually in"estru#tible will not s!atter

3ower #ost

3ow t!ermal #on"u#ti$ity

Ma*imum "ifferential ressure ? bar

%ig!er leaage "ue to "istortion

Minimum P of > bar re4uire" note 26:

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Materials Wet Seals

Material

JC

Code

Vickers

Hardness

Thermal

ConductivityW/mC@20C

Expansion

CoefcientX 10!/C

Thermal

Shock000"s W/m

Density

000"s kg/m#

Silicon Carbideure !lpha Sintered

2$$ 2%00 12% &'0 2& #'1

Silicon Carbide "#$%Si& 'eaction (onded

0((2%00

) so*ter Silicon1%0 &'! #% #'1

Converted SiliconCarbide)Carbon 121 2%00) so*ter carbon %0 &'0 #0 2'0

Tun*sten Carbide"+% Cobalt

02% 1%001!00 100 %'2 &( 1&'$

Tun*sten Carbide"+% ,ickel

00% 1#001%00 (0 %'! 1&'$

!luminium -xide

..&/% !lumina

0%+ 1%00) 2! !'+ ! #'+

!ustenitic Cast 0ron#1% ,i2 +% Cu

00$ 200 &0 1+'# $'#

Carbon34raphite'esin 0mpre*nated

1$1+0

,estimated-12 #'$ 10 1'(