CM M 09 Mechanical Seal

8/9/2019 CM M 09 Mechanical Seal

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CONSTRUCTION MAINTENANCE

DEPARTMENT

MECHANICAL TECHNICIAN

QUALIFICATION MODULE

MECHANICAL SEAL TRAININGCOURSE

EXIT
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IntroductionIntroduction

Mechanical Seals is a deice !hich a"solutel# $reents the lea%a&e

o' $ressuri(ed 'luid alon& a rotar# sha't in e)ui$*ents such as

$u*$s+ co*$ressors+ a&itators+ etc, This deice re$laces the

conentional *ethod o' sealin&+ i( &land ro$es,


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Secondar# Seal

Ho! A Seal -or%s .Ho! A Seal -or%s .

/asic Mechanical seal/asic Mechanical seal

T#$es O' Mechanical SealsT#$es O' Mechanical Seals

Hands0on E1ercise

H#draulic /alance Seals

De'initionDe'inition Flash CardsFlash Cards

Main MenuMain Menu

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2ri*ar# Seal

Seal Arran&e*ent


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De'initionDe'inition

Adanta&es o' *echanical seals oer conentional $ac%in& are as

'ollo!s3 4ero or li*ited lea%a&e o' $roduct 5*eet e*ission re&ulations,6 Reduced 'riction and $o!er loss, Eli*ination o' sha't or sleee !ear,

Reduced *aintenance costs, A"ilit# to seal hi&her $ressures and *ore corrosie eniron*ents, The !ide ariet# o' desi&ns allo!s use o' *echanical seals in al*ost

all $u*$ a$$lications,

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All *echanical seals are constructed o' three "asic sets o' $arts as

sho!n in Fi&,

7, A set o' $ri*ar# seal 'aces3 one rotar# and one stationar#8sho!n in Fi&,

as seal rin& and insert,

9, A set o' secondar# seals %no!n as sha't $ic%in&s and insert *ountin&s

such as :0rin&s+ !ed&es and ;0rin&s,


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Conentional =-et> Mechanical SealsConentional =-et> Mechanical Seals

Loose rin& set scre!ed to the sha't,Loose rin& set scre!ed to the sha't,

/asic Mechanical Seal 0 7

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O0rin& $reents lea%a&e throu&h the "ore,O0rin& $reents lea%a&e throu&h the "ore,

-ear here !ill create lea%a&e,-ear here !ill create lea%a&e,

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/asic Mechanical Seal 0 9


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Heat &enerated hereHeat &enerated here

Lea% $athLea% $athLar&e co*$onent,Lar&e co*$onent,

S$rin& ensures auto*atic ad?ust*entS$rin& ensures auto*atic ad?ust*ent

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/asic Mechanical Seal 0 6 - Ma. in $team%ater ::>6 - Ma. in $team

:=>6(:=>6(

+erfluoroeleastomer+erfluoroeleastomer%e.g.! Isolast! @alreA(%e.g.! Isolast! @alreA(

-356 to 3:> 0 =:>6-356 to 3:> 0 =:>677

hloroprenehloroprene- ideal for refrigeration duties- ideal for refrigeration duties-


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$econdary $eal) edge

edge

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$ d $ l d


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Type :5B&Type :5B&

$econdary $eal) edge

edge

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$ d $ l & ll


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$econdary $eal) &ello"s

Elastomer &ello"s grips shaft tightlyElastomer &ello"s grips shaft tightly

o contact here.o contact here.

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$ d $ l + h


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&ello"s flees to ta,e up "ear! misalignment and aial play&ello"s flees to ta,e up "ear! misalignment and aial play

'ine machined shaft surface re1uired'ine machined shaft surface re1uired

/o not use a CgoodD lubricant -/o not use a CgoodD lubricant -never use silicon greasenever use silicon grease..

$econdary $eal) on-+usher

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El t & ll $ l


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Type >53Type >53

Type 3Type 3

Elastomer &ello"s $eals

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$econdary $eal) on +usher


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o movement here.o movement here.

&ello"s epands to&ello"s epands to

ta,e up "earta,e up "ear

o contacto contact

here.here.


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$econdary $eal) on +usher


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#dvantages#dvantagesTemperatures to bar g(.Maimum pressure => bar g %3-ply to 4> bar g(.


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Hands on Eercise


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'it a Type 3 Elastomer &ello"s $eal'it a Type 3 Elastomer &ello"s $eal

Hands-on Eercise

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Hands on Eercise


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'itting a Type 3

Elastomer &ello"s $eal

Hands-on Eercise

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Hands on Eercise


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%:(

: 8ightly scribe first datum line %:( on shaft.

'itting a Type 3 Elastomer &ello"s $eal'itting a Type 3 Elastomer &ello"s $eal

Hands-on Eercise

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Hands on Eercise


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%:(

3 /ismantle pump remove seal chamber.


Hands-on Eercise

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Hands on Eercise


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Fas,et

XG

=. 'it Mating *ing into Fland +late.

Measure dimension XG.


Hands-on Eercise

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Hands on Eercise


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%:(%3(

XG

< $cribe line %3( XG mm outboard of line %:(.


Hands-on Eercise

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Hands on Eercise


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%=( %:(%3(

XG

8=

GG

ote this dimension from line %=( toote this dimension from line %=( to

end of shaft or a shaft step.end of shaft or a shaft step.

Hands-on Eercise'itting a Type 3 Elastomer &ello"s $eal'itting a Type 3 Elastomer &ello"s $eal

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> $cribe line %=( 8= mm inboard of line %3(!

8= is the "or,ing length of the seal unit%$ee 'itting Instructions(.

Hands-on Eercise


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$uitable pushing sleeve

8ubricate shaft "ith suitable lubricant

%3(

On single-ended pumps! first slide

gland plate onto shaft! ta,ing care

not to damage the mating ring

%=( %:(

4 +ushing on the tailof the bello"s! slide seal head into position! passed

line

%=(.&) $pring and 8ocating *ing removed.

'itting a Type 3 Elastomer &ello"s $eal'itting a Type 3 Elastomer &ello"s $ealHands-on Eercise

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Hands-on Eercise


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%=( %:(%3(

J *eplace spring and spring locating ring.


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Hands-on Eercise


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%3(%:(%=(

9 Ensure setscre"s are "ithdra"n sufficiently to clear shaft and slide abutment

ring into position abutting line %=(.

GG

hec, this dimension from line %=( tohec, this dimension from line %=( to

end of shaft or a shaft step.end of shaft or a shaft step.

Hands-on Eercise'itting a Type 3 Elastomer &ello"s $eal'itting a Type 3 Elastomer &ello"s $eal

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Hands-on Eercise


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%=( %:(%3(

B hec, ring is s1uare. Tighten setscre"s. *efit seal chamber. Ensure lapped

faces are perfectly clean K dry.


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Hands-on Eercise


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%=( %:(%3(

:5 Insert gland plate into seal chamber.


Hands-on Eercise

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Hands-on Eercise


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%=( %:(%3(

8=


Hands-on Eercise

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:: Insert and evenly tighten < bolts! gently compressing seal to

its "or,ing length %8=(.

Hands-on Eercise


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#ssemble and 'it a Type :5B +T'E edge $eal#ssemble and 'it a Type :5B +T'E edge $eal

Hands-on Eercise

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Hands-on Eercise


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Hands on Eercise

'itting a Type :5B +T'E edge $eal'itting a Type :5B +T'E edge $eal

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Hands-on Eercise


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%:(

: $cribe first datum line %:( on shaft.


Hands on Eercise

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Hands-on Eercise


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Hands on Eercise

%:(

3 *emove shaft from seal chamber.HOME

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Hands-on Eercise


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Hands on Eercise

Fas,et

XG

= Measure dimension XG.HOME

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Hands-on Eercise


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Hands on Eercise

XG

%:(%3(

< $cribe line %3( XG mm inboard of line %:(.HOME

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Hands-on Eercise


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Hands on Eercise

XG

%:(%3(%=(

8=

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> $cribe line %=( 8= mm inboard of line %3(!

8= is the "or,ing length of the seal unit %see 'itting Instructions(.

Hands-on Eercise


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Hands on Eercise

%=( %3( %:(

4 Ensure setscre"s are "ithdra"n sufficiently to clear shaft and

slide seal into position abutting line %=(. HOME

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Hands-on Eercise


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%:(%3(%=(

Ti&hten setscre!s and re$lace sha't seal in seal cha*"er,

Ensure runnin& 'aces are $er'ectl# clean and dr#,

Hands on Eercise


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Hands-on Eercise


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Hands on Eercise

'itting a Type :5B +T'E edge $eal'itting a Type :5B +T'E edge $eal#G

%:(%3(%=(

K Insert &land $late into seal cha*"er, Chec% &a$ A,HOME

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Hands-on Eercise


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%:(%3(%=(

8=

Insert and eenl# ti&hten @ "olts+ &entl#

co*$ressin& seal to its !or%in& len&th 5L


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Holdin& Cli$s -ed&e Seals

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Heat Te*$erature ControlHeat Te*$erature Control


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$$Heat in Stu''in& /o1

T!o sources o' heat,T!o sources o' heat,heat soa% 'ro* the $roductheat soa% 'ro* the $roductheat &enerated "# the sealheat &enerated "# the seal

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Heat &eneration3 the $ro"le*


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& $

2ressure dro$s toat*os$heric

Te*$erature increases

59:C6

Fluid 'il* thic%ness reduces

or disa$$ears

2re*ature 'ailure,

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H#draulic /alance


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#

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H#draulic /alance


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#

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H#draulic /alance


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#

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H#draulic /alance


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#

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H#draulic /alance


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#

:5

>5L:3>L

5.9cm3

:cm3

+ressure :5 ,g0cm3

:3>L - >5L J>L %J.> bar(

5

:5

5

J>L >5L

J>L - >5L 3>L %3.> bar(HOME

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H#draulic /alance


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Un"alanced 2usher SealUn"alanced 2usher Seal /alanced 2usher seal/alanced 2usher seal

#

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H#draulic /alance 0 /ene'its


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Reduced heat &eneration Ideal 'or unsta"le and lo! SG 'luids

Less heat to "e dissi$ated 0 less coolin& re)uired

Reduced !ear rate Lon&er li'e

Reduced $o!er re)uired to drie the seal Lo!er runnin& costs

Increased $ressure ran&e 'or the seal This si*$le *odi'ication allo!s *uch hi&her $ressures to "e sealed,

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Mechanical Seal Arran&e*ents


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Mechanical seals are arran&ed in di''erent !a#s as $er the A2I 2lan,

Sin&le Seals can "e *ounted internall#+ e1ternall# or internall# *ounted

!ith rotatin& counter rin&,, The# can "e either "alanced+ un"alanced+ !ith

or !ithout circulation or 'lushin& o' seal 'aces+ !ith or !ithout throttle

"ushes,

As 'or Dou"le Mechanical seals+ either one o' the seals can "e

un"alanced or "alanced on its o!n or "oth to&ether, It can "e arran&ed in

"ac% to "ac%+ 'ace to 'ace+ or tande* arran&e*ent,

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Sin&le seals utilise $rocess 'luid toSin&le seals utilise $rocess 'luid to

$roide the lu"ricatin& inter'ace 'il*$roide the lu"ricatin& inter'ace 'il*

Use *ulti$le seals i'3

'luid is to1ic 'luid is 'la**a"le

eniron*ental

isolation re)uired

'luid chan&es state

'luid is not a &ood lu"ricantor is a &as

'luid is unsta"le

dr# runnin& li%el#

e1$ensie $roduct

critical $u*$

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T!o co**on arran&e*ents Tande*

lo! $ressure "u''er 'luid

hi&h inte&rit# secondar# contain*ent

in"oard seal lu"ricated "# $roduct

/ac%0to0/ac% 5Dou"le6

$ressurised "arrier 'luid

in"oard seal lu"ricated "# "arrier 'luid

There are *an# other arran&e*ents Dual Series Concentric Face0to0Face etc,

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Clean "u''erClean "u''er

'luid lu"ricates'luid lu"ricates

this sealthis seal

/u''er 'luid is at/u''er 'luid is at

lo!lo!

5at*os$heric65at*os$heric6

$ressure,$ressure,

Out"oard Seal

/asic tande* non0$ressurised dou"le seal/asic tande* non0$ressurised dou"le seal

Use A2I 2lan 9

Multi$le seals3 Tande*

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In"oard Seal

+roduct+roduct

lubricateslubricates

this sealthis seal


This seal isThis seal isunder 'ullunder 'ull

$roduct$roduct

$ressure$ressure

Note $ossi"leNote $ossi"le

conta*inationconta*inationo' "u''er 'luid,o' "u''er 'luid,

Nse #+I +lan >3


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Use A2I 2lan 9


In"oard sealIn"oard seal

*ost li%el# to 'ail*ost li%el# to 'ail

'irst'irst

/u''er 'luid/u''er 'luid

leel$ressureleel$ressure

!ill rise!ill rise

Out"oard sealOut"oard seal

acts as secondar#acts as secondar#

contain*entcontain*ent

2rocess can2rocess cancontinue untilcontinue until

co*$leted,co*$leted,


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Lo! $ressureLo! $ressure

'luid su$$l#'luid su$$l#


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I' out"oard sealI' out"oard seal

'ails+ "arrier'ails+ "arrier

$ressure !ill$ressure !ill

'ail and $u*$'ail and $u*$

*ust "e*ust "e

s!itched o'' ass!itched o'' as

$roduct !ill$roduct !ill

lea% out,lea% out,

Use A2I 2lan

CM M 09 Mechanical Seal

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