John Crane EAA INTERNAL TO JOHN CRANE - NOT TO BE RELEASED TO EXTERNAL PARTIES PARTIES WITHOUT PERMISSION
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GUIDE TO MEASUREMENT OF ROTATING EQUIPMENT Contents: P"#e
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INTRODUCTION
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SOURCES OF EQUIPMENT DIMENSIONS
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WHERE TO TA&E DIMENSIONS
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RECORDING DATA
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MEASURING EQUIPMENT ) ACCURAC*
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MEASUREMENTS ) CHEC&S
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RETROFITS - REUSING EXISTING SEAL PARTS
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UPGRADES FROM GLAND PAC&ING
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DOUBLE SEALS
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PRE-COMMISSIONING EQUIPMENT CHEC&S
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OTHER EQUIPMENT
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1%!
STUFFING BOX ) SLEE/E DATA SHEET
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John Crane EAA GUIDE TO MEASUREMENT OF ROTATING ROTATING EQUIPMENT INTERNAL TO JOHN CRANE - NOT TO BE RELEASED TO EXTERNAL PARTIES PARTIES WITHOUT PERMISSION
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John Crane EAA GUIDE TO MEASUREMENT OF ROTATING ROTATING EQUIPMENT INTERNAL TO JOHN CRANE - NOT TO BE RELEASED TO EXTERNAL PARTIES PARTIES WITHOUT PERMISSION
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H0e234n5s to o4nts 4n t6e 7o89ent:
&E* ASPECTS AS PECTS OF ROT ROTA ATING EQUIPMENT: !eatin" # Coolin" Galler $ See Section 6.4
Shaft See Section 6.1.1
Access Windo See Section 6.3.3
Nearest Obstructio n See Section 6.3.1
(irection of Rotati on See Section 6.5
PC( # Bolt Studs See Section 6.2
Seal Chamber Bo re
Radial Obstruction See Section 6.3.2
See Section 6.1.2
'lush Connecti on
See Section 6.6
S%i"ot &ocation See Section 6.1.2
John Crane EAA GUIDE TO MEASUREMENT OF ROTATING ROTATING EQUIPMENT INTERNAL TO JOHN CRANE - NOT TO BE RELEASED TO EXTERNAL PARTIES PARTIES WITHOUT PERMISSION
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1! INTRODUCTION )echanical seals are not stand*alone items+ but ala$s form %art of a lar"er rotatin" e,ui%ment assembl$assembl$- Ob.iousl$ if the seal is to function %ro%erl$ it is .ital that the desi"n of the seal installation is based on the correct dimensions and information 8o;e24n# "33 "se8ts "se8ts o< t6e 2ot"t4n# 2ot"t4n# e=94en e=94entt >6486 >6486 "?e8t "?e8t t6e se"3 se"3- /n man$ cases+ this infor informa matio tion n is relia reliabl$ bl$ a.aila a.ailable ble from from drain drain"s+ "s+ but in some some situat situation ions+ s+ there there is no alternati.e but to ta0e measurements measurements of the actual e,ui%ment in i n the eldB$ their nature+ rotatin" e,ui%ment tends to be .er$ di.erse in desi"n hence+ it is not %ossible to %roduce a document "uide co.erin" all such desi"ns that ma$ be encountered in the eld- Rather this document co.ers normal measurements for a t$%ical centrifu"al %um%+ but also refers to other e,ui%ment t$%es in %assin"- With some eld e%erience+ it should be %ossible to a%%l$ the %oints "i.en in this "uide to other t$%es of e,ui%ments on a case*b$*case basis-
%! SOURCES OF EQUIPMENT DIMENSIONS 1 EQ EQUI UIPM PMEN ENT T OEM OEM A(4AN5AGES (/SA(4AN5AGES
% END-USER
A(4AN5AGES (/SA(4AN5AGES
As t6e t6e o24 o24#4 #4n" n"33 "n "n9< 9<"8 "8t9 t92e2 2e2@ t6e t6e OE OEM M 9st 9st 6";e 6";e 72">4n#s As ori"inal manufacturin" dr drain"s these should re6ect re6ect the actual e,ui%ment dimensions 7but see belo8 )a$ no not be be co correct+ ch chan"es ma ma$ ha ha.e be been ma made in in Production Production or on site hich are not re6ected on the drain" OE) often unillin" to release drain"s due to a8 condentialit$+ b8 no benet to them+ c8 desire to retain seal s%ares business etcT6e en7-9se2 "0 6";e "88ess to 72">4n#s <2o t6e OEM o2 4n soe 8"ses "0 e;en 6";e "7e t6e42 o>n 72">4n#s As a customer the end*user ma$ ha.e more in6uence for obtainin" OE) drain"s than 9ohn Crane as a su%%lier (rain"s ma ma$ be be in inaccurate or or in incom%lete )odications ma$ ha.e been made to the e,ui%ment hich ha.e not been recorded
$ CO COMPETITOR
Fo2 2e 2et2ots t6 t6e en en7-9se2 " "0 6" 6";e " se"3 72 72">4n# <2o " 8oet4to2 s6o>4n# se"3 86"e2 "n7 o2 t6e en;e3oe 74ens4ons o< t6e e4st4n# se"34n# "22"n#eent
A(4AN5AGES (/SA SA( (4AN5AGES
Easier than site measurement 5he co com%etitor:s dra dra in" ma ma$ co contain er errors 7s 7sometimes deliberate;8 5here ma$ be inade,uate inade,uate dimensional information information shon on the com%etitor:s drain"s * a"ain this is sometimes intentional to ma0e seal retrottin" .er$ di
' SITE MEASUREMENT
T6e s9e8t o< t64s G947e
A(4AN5AGES
Access to the actual e, e,ui%ment in hich th the seal ill be installed ensures that an$ local modications etc- that ma$ ha.e been made ill be a%%arent
John Crane EAA GUIDE TO MEASUREMENT OF ROTATING ROTATING EQUIPMENT INTERNAL TO JOHN CRANE - NOT TO BE RELEASED TO EXTERNAL PARTIES PARTIES WITHOUT PERMISSION
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5he e,ui%ment ma$ be runnin" an and th there ma$ be no maintenance o%%ortunit$ to dismantle it for measurement %ur%oses Careful measurement+ recordin" and communication of dimensions b$ the en"ineer are essential * errors must be a.oided; 5he measurement measurement %rocess is time*consumin" time*consumin"
While the other o%tions should be considered rst+ this document focuses on o%tion no- = e"s92een entt o< 2ot"t4n 2ot"t4n# # e=94 e=94ent ent on s4te s4te- 5his abo. abo.e+ e+ i-ei-e- e"s92e 5his measur measureme ement nt is in.ariabl$ carried out b$ 9ohn Crane %ersonnel+ either because the site en"ineers are too bus$ to do this and re"ard it as a seal .endor:s tas0+ or because the$ are unillin" to ta0e the res%onsibilit$ of measurin" it themsel.es in case the seal ultimatel$ does not t;
$! WHERE TO TA&E DIMENSIONS - e# SITE JC WOR&SHOP OTHER 'or small %um%s at sites close to a 9ohn Crane or0sho%+ remo.in" bac0%lates or other %arts %arts of the e,ui%m e,ui%ment ent from from the site site for for measur measureme ement nt %ur%os %ur%oses es ma$ ma$ someti sometimes mes be %ossible- 5his "i.es the ad.anta"es of bein" able to measure and record details in a :control :controlled: led: manner+ manner+ ith more measurem measurement ent e,ui%ment e,ui%ment a.ailable and the o%tion o%tion of ma0in" a cu% of tea- !oe.er+ in %ractice this is "enerall$ im%ractical either due to time constr constrain aints+ ts+ remot remote e locati location+ on+ lar"e lar"e e,ui%m e,ui%ment ent++ di< di
'! RECORDING DAT DATA )easurements )easurements ta0en should be recorded in a clear and concise a$a$- 5his should normall$ S6eet as shon in Se8t4on be done on the 9ohn Crane St9n# Bo ) S3ee;e D"t" S6eet as 1%!1%!- An$ as%ects of the e,ui%ment not shon on the form but hich are rele.ant can be s0etched se%aratel$Note that one %ractical a$ of recordin" .arious features of the e,ui%ment ma$ be to use %hot %hoto" o"ra ra%h %hs s 7di" 7di"it ital al or Polar olaroi oid8 d8++ sinc since e thes these e can can sho sho the the o.er o.eral alll :st$ :st$le le:: of the the e,ui%ment+ the %ositions of an$ obstructions+ the etent of the dama"e to an$ orn com%onents etc- 5he %hoto"ra%hs can be re.ieed b$ other en"ineers # draftsmen bac0 in the o
(! MEASURING EQUIPMENT ) ACCURAC* 5he 9ohn Crane re%resentati.e re%resentati.e should ta0e suitable measurin" e,ui%ment hen attendin" attendin" the site+ normall$ includin" a 4ernier Calli%er 72>?mm*ran"e min-8+ a )icrometer and a 12@ rulerSuitable measurin" e,ui%ment and accuracies are "i.en a"ainst each of the dimensions descri described bed belo belo-- Where Where accur accurate ate measur measureme ement nt is needed needed and a 4ernie ernierr Calli% Calli%er er or )icrometer is to be used+ these should be %eriodicall$ calibrated 7t$%ical inter.al 1 $ear for irre"u irre"ular lar use8use8- /t is someti sometimes mes thou"h thou"htt that that onl$ onl$ )anuf )anufact acturi urin" n" # C measur measurin" in" e,ui e,ui%m %men entt need needs s cali calibr brat atio ion+ n+ and and that that this this is not not nece necess ssar ar$ $ for for e,ui e,ui%m %men entt used used intermittentl$ on site- Clearl$ this is a fallac$+ since measurin" an$thin" ith uncalibrated # inaccurate e,ui%ment defeats the hole %ur%ose of ta0in" an :accurate: measurement-
John Crane EAA GUIDE TO MEASUREMENT OF ROTATING ROTATING EQUIPMENT INTERNAL TO JOHN CRANE - NOT TO BE RELEASED TO EXTERNAL PARTIES PARTIES WITHOUT PERMISSION
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E.en for calibrated e,ui%ment+ it should be remembered that a 4ernier Calli%er is subect to a measur measurin" in" tolera tolerance nce of ?-?2mm ?-?2mm++ a )icro )icromet meter er to ?-?1mm ?-?1mm-- Attem Attem%ti %tin" n" to measur measure e an$thi an$thin" n" to "reat "reater er accura accurac$ c$ than than ?->mm ?->mm ith ith a ruler ruler is unacce unacce%ta %table ble %racticeWhile "reater accurac$ could be achie.ed ith bore "au"es+ these are usuall$ una.ailable on site and are not normall$ arranted for this t$%e of or0-
+! MEASUREMENTS ) CHEC&S +1 CRITICAL SURFACES FOR SEALING ) LOCATION 5he folloin" are critical surfaces for location of seal com%onents and for secondar$ seal sealin in""- Acco Accord rdin in"l "l$ $ s%ec s%ecia iall care care must must be ta0 ta0en to ensu ensure re thes these e elem elemen ents ts of the the e,ui%ment are %ro%erl$ measured # chec0ed-
1 - s6"
+11 S6"mm lon" D 2?o8 to ensure that the slee.e # slee.e o*rin" # secondar$ seal can easil$ be %assed onto the shaft durin" seal installation- /f this does not eist then the end*user should be as0ed to modif$ the shaftNote should be ta0en of an$ s%ecial features eistin" on the shaft+ for eam%le %in or setscre holes+ threads etc-+ and their sie and %osition should be recorded-
John Crane EAA GUIDE TO MEASUREMENT OF ROTATING ROTATING EQUIPMENT INTERNAL TO JOHN CRANE - NOT TO BE RELEASED TO EXTERNAL PARTIES PARTIES WITHOUT PERMISSION
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NOTE: Some NOTE: Some shaft slee.es ha.e a hi"h hardness 7chrome steels etc-8 or a hard coatin" 7)etco+ chrome oide s%ra$ etc-8 in the area of the seal- /t is im%ortant to note the %osition of an$ such coatin"s+ and to establish the shaft hardness 7normall$ .ia the OE) or %ossibl$ ith a hardness tester8+ since this ould aect the holdin" %oer of setscres 7seal head or dri.e collar8 5$%ical 5$%ical manufacturin" toleranceH ?-?2 ?-?2 to ?-?>mm Re,uired Re,uired measurement toleranceH ?-?1mm Surface nishH ?-Iµm RoundnessH ?-?>mm 5/R Preferred method of measurementH )icrometer +1% Bo2e o< se"3 86"e2 s4#ot 74"ete2 Good Good %racti %ractice ce for all mechan mechanica icall seals seals demand demands s a radial radial locati location on of the statio stationar nar$ $ element+ to ensure those %arts are centred relati.e to the shaft- 'or the maorit$ of seal installations the bore of the seal chamber is used as a close clearance %ilot diameter+ to radiall$ locate the stationar$ %ortion of the seal assembl$assembl$- 5he ece%tions are installations hereH • the radial location is ta0en from an O( s%i"ot+ in hich case similar comments a%%l$ to that O( surface instead of the /( • some cartrid"e seal desi"ns are radiall$ set throu"h settin" s%acers or centralisin" rin"s 7e-"- 5$%e >F?? series etc8'or either of the seal chamber bore is then less critical+ since it is not used for sealin" or location-
I D S4#ot
OD S4#ot
Where an /( s%i"ot is used+ there ma$ be a short recess machined as a counterbore into the face face of the seal chambe chamberr- /n such such cases cases this this reces recess s is intend intended ed s%eci s%ecica call$ ll$ for s%i"ottin" %ur%oses+ hence should be a controlled 7ti"ht tolerance8 diameterdiameter'or some seal desi"ns+ an o*rin" in the bore of the seal chamber forms the static seal beteen the "land %late and the seal chamberchamber- /n such cases the surface nish of the seal chamber bore must be summ lon" D 2?o8- Similarl$+ if the o*rin" has to %ass o.er an$ connection holes or other ste%s on the /( surface+ these should be dressed or relie.ed to %re.ent o*rin" dama"e durin" installation 5$%ical 5$%ical manufacturin" toleranceH .aries Re,uired toleranceH ?-?2mm Re,uired Re,uired measurement toleranceH ?-?2 * ?-?>mm Surface nishH ?-Iµm RoundnessH ?-?>mm 5/R Preferred method of measurementH 4ernier
John Crane EAA GUIDE TO MEASUREMENT OF ROTATING ROTATING EQUIPMENT INTERNAL TO JOHN CRANE - NOT TO BE RELEASED TO EXTERNAL PARTIES PARTIES WITHOUT PERMISSION
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+1$ F"8e o< se"3 86"e2 5he face of the seal chamber is normall$ used as a sealin" surface for either an o*rin" or "as0et in the seal "land %late- Althou"h this is a static secondar$ seal+ ne.ertheless it is im%ort im%ortant ant that that the surface surface nish nish of the seal chambe chamberr face face is ade,ua ade,uate te for sealin" sealin" %ur%oses- 5he face of the seal chamber also acts as an abutment for the "land %late+ hence must be s,uare to the shaft to %re.ent an$ misali"nment of the stationar$ seal assembl$Surface nishH ?-Iµm S,uareness to shaftH 5/R ?-??>mm %er 1?mm of seal chamber bore
+% BOLT STUD PCD 5he bolt PC( is a critical %iece of information an$ errors made in recordin" this could be e%ensi.e and time*consumin" 7or e.en im%ossible;8 to rectif$+ and ould ine.itabl$ be dama"in" to the 9ohn Crane re%utation 5he diameter across from the outside of one stud to the outside of the diametricall$ o%%osite stud should be measured usin" a 4ernier Calli%er- A measurement should then be ta0en from the inside of the studs- 5he mean of these 2 dimensions should then be ta0en and this considered as the PC(- With = studs+ this should be chec0ed ith the o%%osin" %air of studs to ensure the "ure is the same; 5he an"le of the bolt %ositions should be noted+ e-"- 5(C and K?o %ositions+ %ositions+ =>oC %ositi %ositions ons++ s%ecia s%eciall %ositi %ositions ons # non*st non*stand andar ard d an"le an"le etcetc- /n the latter latter case+ case+ it ma$ be necessar$ to :construct: the %ositions of the bolt studs b$ ta0in" se.eral measurementsNOTEH NOTEH there is often a ide tolerance on the actual %ositions of bolt studs hence+ e.en for orthodo bolt %ositions it is still orth constructin" the %osition as a chec0 5he bolt stud etension should be measured+ since this ill limit the section of the seal "land %late or re,uire re%lacement lon"er studs- 5his dimension should be measured from the end face of the seal chamber to the end of the threaded %ortion of the stud- Note that for seal retrots the thic0ness of the eistin" "land %late can also be used as a "uide to alloable en.elo%e dimensions 5$%ical 5$%ical manufacturin" toleranceH ?-2 ?-2 * ?->mm Re,uired Re,uired measurement toleranceH ?-2mm Preferred method of measurementH 4ernier
+$ OBSTRUCTIONS )ost )ost seal seal select selection ions s and desi"n desi"ns s are are constr constrain ained ed b$ the a.ailabl a.ailable e s%ace s%ace in the seal seal chamber- 5his %roblem is com%ounded in a "roin" number of u%"rades to double seal installations in older e,ui%ments+ resultin" from "reater em%hasis on emissions# reliabilit$ # safet$ etc-
John Crane EAA GUIDE TO MEASUREMENT OF ROTATING ROTATING EQUIPMENT INTERNAL TO JOHN CRANE - NOT TO BE RELEASED TO EXTERNAL PARTIES PARTIES WITHOUT PERMISSION
PAGE A88ess W4n7o> t048"3 en7;4e> o< se"3 86"e2:
Ne"2est R"74"3 Ost298t4on e"24n# 2"85et
K
Ne"2est A4"3 Ost298t4on e"24n# 6o9s4n#
D2"4n Ho3e
5he maor constraints constraints facin" the seal su%%lier are are as follosH +$1 A4"3 74st"n8e 8e to t6e e"24n e"24n# # 5he most im%ortant aial obstruction to consider is the 74st"n 6o9s4n#6o9s4n#- 5his is .ariousl$ referred to as the N-O- 7Nearest Obstruction8 or the '-O-B- 7'irst OBstruction8- 5his restricts the len"th of the seal assembl$ outboard of the seal chamber/t is normall$ im%ossible to increase this distance+ because the bearin" %osition ill be ed as %art of the ori"inal desi"n- 5herefore+ 5herefore+ the onl$ a$ to ma0e more s%ace a.ailable ould be to machine bac0 the surface of the seal chamber- !oe.er+ this is un%o%ular ith end*users due to the dimm Re,uired Re,uired measurement toleranceH 1mm Preferred method of measurementH 4ernier or ruler
+$% R"74"3 Radial obstructions t$%icall$ include bearin" brac0ets or other features limitin" the desi"n of the seal installation- 5hese can aect the "land %late O(+ the sie and %osition of ta%%ed ta%%ed conne connecti ctions ons for 6ushin 6ushin" " # ,uench ,uenchin" in" etcetc- 5hou"h 5hou"htt must must also also be "i.en "i.en to the :er"on :er"onomi omics: cs: of the seal seal desi"n desi"n++ for eam% eam%le le the s%ace s%ace a.aila a.ailable ble for ti"hte ti"htenin nin" " of setscres+ setscres+ remo.al of settin" s%acers etc 5he %ositions of an$ obstructions should be :constructed: b$ ta0in" .arious measurements relati.e to the face of the seal chamber+ the shaft+ the bearin" housin" etc- Bearin" brac0et desi"ns ill be .ar$ de%endin" on the indi.idual e,ui%ment+ hoe.er St9n# Bo "n7 S3ee;e D"t" t$%ica t$%icall con"u con"urat ration ions s includ include e those those shon shon on the St9n# S6eetS6eet 5$%ical 5$%ical manufacturin" toleranceH ?->mm ?->mm Re,uired Re,uired measurement toleranceH 1mm Preferred method of measurementH 4ernier or ruler 'or 'or retr retrot ottin tin" " %roe %roects cts++ the com%et com%etito itors: rs: seal seal com%on com%onent ents s are are a relia reliable ble "uide "uide to acce%t acce%tabl able e seal seal en.elo en.elo%e %e dimens dimension ions+ s+ since since the$ the$ ha.e ha.e alread alread$ $ been been instal installed led in the a.ailable s%ace- 5herefore+ b$ measurin" the O( of the eistin" "land %late+ the o.erall len"th of the eistin" slee.e etc-+ it is safe to conclude that these dimensions ill be less than the radial or aial obstructions-
John Crane EAA GUIDE TO MEASUREMENT OF ROTATING ROTATING EQUIPMENT INTERNAL TO JOHN CRANE - NOT TO BE RELEASED TO EXTERNAL PARTIES PARTIES WITHOUT PERMISSION
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+$$ A88ess W4n7o>s Where the seal assembl$ ma$ ha.e to %ass throu"h an access indo+ this ill be a constraint on the o.erall dimensions of the seal- Similarl$+ if a seal is to be tted from the cou%li cou%lin" n" sid side e of the e,ui%m e,ui%ment ent++ the (BSE (BSE 7(ista 7(istance nce Bete Beteen en Shaft Shaft Ends8 Ends8 should should be noted+ since ith the cou%lin" remo.ed this dimension ill limit the o.erall len"th of the seal-
+' COOLING HEATING HEATING GALLERIES Some %um%s ma$ ha.e "alleries around the seal chamber for the %ur%oses of heatin" or coolin" the %um%- 5hese are usuall$ e.ident from the ta%%ed heatin" 7steam8 or coolin" 7ater8 connections runnin" into the %um% casin"- 5he %osition of these connections and %i%es ma$ obstruct the area around the seal+ and limit the sie # desi"n of the seal installationNOTE: Where NOTE: Where modications are bein" %ro%osed to older e,ui%ment 7e-"- re*bore of seal chamber8 ith "alleries tted+ careful thou"ht must be "i.en to hether the modication is %ractical%ractical- (ecreasin (ecreasin" " the all thic0ness of the casin" ill aect aect the inte"rit$ of the %ressure casin"- 5herefore+ an$ such situations should be referred to the OE) and # or end*user+ and 9ohn Crane should ne.er ta0e the res%onsibilit$ res%onsibilit$ for the modication alone-
+( DIRECTION OF SHAFT ROTATION 5he direction of shaft shaft rotation rotation is critical for seal desi"ns desi"ns that includeH • unidirectional s%iral "roo.es 7e-"- 5$%e 2I?? series+ 5$%e 2I series+ 5$%e 2ISC+ 5$%e 2IS5+ 5$%e 2I> etc-8 here there is an$ li0elihood of %rolon"ed re.erse rotation a bi* directional seal desi"n should be considered• aial 6o %um%in" scrolls • :handed: s%rin"s 79ohn Crane 'leibo 'leibo %roduct ran"e8 • tan"ential connections 5he direction of shaft shaft rotation 7CW # CCW8 should should be chec0ed on site b$ reference reference to an$ # all of the folloin"H • %um% data sheets • %h$sical %um% 7there ill normall$ be an arro on the bearin" housin" or %um%in" casin"8 • orientation of dischar"e .olute on %um% • eist eistin" in" seal seal %arts %arts hich hich ma$ ha.e ha.e tan"e tan"enti ntial al 6ushin 6ushin" " connec connectio tions ns or :hande :handed: d: desi"ns • site o%erators 5he direction of shaft rotation rotation should be recorded as from the motor side- Note that con.entionall$ an AP/ %um% ill rotate CW hile an ANS/ %um% ill rotate CCW+ as seen from the motor side- TO BE CHEC&ED
++ PIPING ) UTILITIES 'or installations that ill ha.e ancillar$ connections such as AP/ Plan 11 6ushin"+ Plan F2 ,uenchin" etc-+ %ro.isions for these su%%lies must be chec0ed- 5his includes chec0in" hether a ta%%in" is %ro.ided on the %um% dischar"e for 6ush recirculation- /f on a retrot %roect an eistin" sealant s$stem or heat echan"er is to be used+ then the sie # location # ca%acit$ etc- must be noted+ and the %i%in" circuit s0etched to include rou"h o.erall dimensions+ ttin"s+ orices+ and %i%e diametersAs abo.e+ the %osition of an$ obstructions should be noted carefull$+ so that the seal can be desi"ned for strai"htforard %i%in" access- 5he utilities themsel.es should also be
John Crane EAA GUIDE TO MEASUREMENT OF ROTATING ROTATING EQUIPMENT INTERNAL TO JOHN CRANE - NOT TO BE RELEASED TO EXTERNAL PARTIES PARTIES WITHOUT PERMISSION
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chec0ed+ includin" eternal 6ushin" %ressure and 6o rate 7AP/ Plan 328 N 2 %ressure 7AP/ Plan >38+ steam %ressure 7AP/ Plan F28+ coolin" ater %ressure # tem%erature # 6o etc-
+, CORROSION EROSION CA/ITATION et8 An$ e.idence of corrosion # erosion # ca.itation to an$ %arts of the %um% in the area of the seal chamber should be noted and discussed ith the end*user- 5his dama"e ma$ eect seal selection+ selection+ desi"n desi"n and installation+ installation+ and ma$ necessita necessitate te re%lacem re%lacement ent of aected aected %um% %um% %arts%arts- Such Such dama"e dama"e ma$ also indica indicate te %robl %roblems ems ith ith some some as%ect as%ect of %um% %um% o%eration that ould be detrimental to seal %erformance hence+ it is in the interests of 9ohn Crane to "et such %roblems %roblems resol.ed/n %articular+ an$ ear to Critical Surfaces for Sealin" and &ocation 7see Section F-18 should be brou"ht to the attention of the end*userend*user-
,! RETROFITS - REUSING EXISTING SEAL PARTS Note that in some cases the customer ma$ re,uest that %arts of the eistin" com%etitor:s seal 7e-"- shaft slee.e or "land %late8 be re*used+ as a %ercei.ed sa.in" in cost- !oe.er+ this is fre,uentl$ di
.! UPGRADES FROM GLAND PAC&ING One t$%e of retrot of an eistin" sealin" de.ice is the re%lacement of "land %ac0in"- 'or older older e,ui%m e,ui%ment ents s that that are are bein" bein" tted tted ith ith mechan mechanica icall seals seals for for the rst time+ time+ the folloin" 0e$ %oints should be notedH • A mechanical seal ill usuall$ need more s%ace than the "land %ac0in"+ hoe.er the s%ace a.ailable in a stu
F39s6 Conne8t4on St9Gn# BoE
John Crane EAA GUIDE TO MEASUREMENT OF ROTATING ROTATING EQUIPMENT INTERNAL TO JOHN CRANE - NOT TO BE RELEASED TO EXTERNAL PARTIES PARTIES WITHOUT PERMISSION
PAGE •
/t is ,uite %ossible that ear on the shaft or the face of the seal stu
Wo2n S6"
•
12
Wo2n F"8e o< St9n# Bo
5he "land %ac0in" folloer ill t$%icall$ ha.e been ti"htened usin" onl$ 2 "land bolts # studs+ hoe.er for e.en ti"htenin" of a seal "land %late = bolt studs are recommended- 5herefore+ the feasibilit$ of addin" in 2 more bolt studs to the face of the seal chamber should be considered-
! DOUBLE SEALS 5he main issues to be considered considered ith double seals seals are as follosH follosH • 5he seal installation ill need more aial 7and %ossibl$ radial8 s%ace than a sin"le seal hence+ the %osition of the nearest obstructions is %articularl$ im%ortant 7see Se8t4on +$ Ost298t4ons8Ost298t4ons8• 5here ma$ be a need for a barrier or buer 6uid connection in the %um% casin"- 5his ma$ eist from from a %re.ious %re.ious seal or "land %ac0in" installati installation on otherise+ otherise+ %ro.isio %ro.ision n ould need to be made to %ro.ide this-
1!! PRE-COMMISSIONING EQUIPMENT CHEC&S Prior Prior to commis commissio sionin nin" " of the rotat rotatin" in" e,ui%m e,ui%ment ent++ the %oints %oints "i.en "i.en belo belo should should be ala$s chec0ed 7normall$ 7normall$ b$ the end*user8- !oe.er if these can be chec0ed at an earlier sta"e durin" measurement of the seal chamber+ this ould allo more time to rectif$ an$ %roblems ith bearin"s # ali"nment # shaft o.alit$ etc 5he readin"s ta0en should be chec0ed chec0ed a"ainst the %ublished limits for the seal AN( those for the e,ui%ment itself- /f actual e,ui%ment tolerances eceed these limits+ this must be discussed ith the end*user # OE) as a%%ro%riate+ to %re.ent %ossible seal %roblems hich ould result-
John Crane EAA GUIDE TO MEASUREMENT OF ROTATING ROTATING EQUIPMENT INTERNAL TO JOHN CRANE - NOT TO BE RELEASED TO EXTERNAL PARTIES PARTIES WITHOUT PERMISSION
PAGE
0.8
0.8
Figure #1 check the shaft and seal chamber dime
Turn the shaft by ha
Note No te mea measur surem emen entt o
nd"ator
igure # 2 easure the the sh shaft ru run nout at the se seal loc loc
13
John Crane EAA GUIDE TO MEASUREMENT OF ROTATING ROTATING EQUIPMENT INTERNAL TO JOHN CRANE - NOT TO BE RELEASED TO EXTERNAL PARTIES PARTIES WITHOUT PERMISSION
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#o # o $e shaft n axa! d
Note measurement on
igure # he maximum m aximum value should not exceed remove an shar ed es or burrs on t
pre-commissioning equipment checks surface finish & dimensional check - '. squareness
Turn the shaft by hand
Note measurement on da! nd"ator
Figure #' the maximum value should not exceed er 10mm of seal chamber bore diameter F!"
1=
John Crane EAA GUIDE TO MEASUREMENT OF ROTATING ROTATING EQUIPMENT INTERNAL TO JOHN CRANE - NOT TO BE RELEASED TO EXTERNAL PARTIES PARTIES WITHOUT PERMISSION
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11! OTHER T*PES OF EQUIPMENT 5his Guide is based around around a standard centrifu"al %um% con"uration+ con"uration+ since these are are the most common e,ui%ments encountered in the eld- !oe.er+ for other e,ui%ments 7e-"a"itators+ a"itators+ fans+ bloers+ steam turbines etc-8 similar similar "uidelines "uidelines a%%l$ in most cases 5hese to"ether ith an understandin" of the seal t$%e to be installed should ensure that the ri"ht measurements and chec0s are made-
111 AGITATORS AGITATORS •
'or "#4t"to2s the the dri. dri.er er unit unit 7mot 7motor or : "ear "earbo bo8 8 ma$ ma$ not not be remo remo.e .ed d for for seal seal installation+ as this is a time*consumin" %rocess- Rather the maintenance %rocedure ma$ in.ol.e the cou%lin" onl$ bein" remo.ed+ and the seal then installed throu"h an "88ess >4n7o>>4n7o>- 5he dimens dimension ions s of the access access indo indo are fre,u fre,uent entl$ l$ small small and rest restric rictt the the o.er o.eral alll en.e en.elo lo%e %e dime dimens nsio ions ns of the the seal seal-- /f this this is not not ta0 ta0en into into consideration then the result can be an e%ensi.e seal that nall$ cannot e.en be installed;
A88ess W4n7o>
•
•
Shaft runout and .ibration le.els on a"itators are in.ariabl$ hi"her than for a %um%+ beca becaus use e the the e,ui e,ui%m %men entt is lar" lar"er er and and ali" ali"nm nmen entt less less %rec %recis isee- 5hes 5hese e shou should ld be discussed on site+ and aial and radial shaft 6oat should be measured if %ractical- /f the e,ui%ment e,ui%ment is runnin" then it should be %ossible to ,ualitati.e ,ualitati.el$ l$ assess assess the shaft shaft mo.ement and .ibration+ e-"- :normal:+ :hi"h: etc- 4ibration le.els at the area of the seal can be recorded recorded if suitable measurement e,ui%ment is a.ailableWhere an inte"ral radial bearin" is re,uired in the seal cartrid"e+ the necessar$ load "ures are needed to correctl$ sie the bearin"- 5hese ma$ be a.ailable from site data sheets or the OE)+ or in the case of a retrot the sie # s%ecication of the eistin" bearin" should be noted-
11% STEAM TURBINES •
Fo2 ste" ste" t924ne t924ne retro etrot ts s 75$%e $%e 2I 2IS5 S5 seal seals8 s8 it is comm common on to nd nd that that the the e,ui%ment on hich the seal ill be installed is old+ and that corrosion has occurred on the casin" and # or shaft- 5his can include steam cuts here the casin" material has been eroded b$ "radual steam lea0a"e o.er a lon" %eriod- /n some cases this is li0el$ to aect secondar$ sealin" and %ilot locations+ and can be so se.ere that there is no o%tion but to re,uest maor e,ui%ment re%airs or re%lacement before the seal can be reliabl$ installed-
John Crane EAA GUIDE TO MEASUREMENT OF ROTATING ROTATING EQUIPMENT INTERNAL TO JOHN CRANE - NOT TO BE RELEASED TO EXTERNAL PARTIES PARTIES WITHOUT PERMISSION
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T6ese "se8ts s6o937 e 86e85e7 >e33 4n "7;"n8e o< se"3 4nst"33"t4on 4< "t "33 oss43eoss43e- 5he alternati.e is that the customer must be %re%ared to e%ect some :sur%rises: hen the turbine is o%ened for seal installation+ and to carr$ out necessar$ re%airs in a short time frame- 5he OE) should be in.ol.ed in this %rocess if %ossible-
John Crane EAA GUIDE TO MEASUREMENT OF ROTATING ROTATING EQUIPMENT INTERNAL TO JOHN CRANE - NOT TO BE RELEASED TO EXTERNAL PARTIES PARTIES WITHOUT PERMISSION
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1%! STUFFING BOX ) SLEE/E DATA SHEET % "#es John Crane #e"han"a! sea!s Engineered Sealing Systems
6 re'eren$e :,,,,,,,,,,,, P+mp t*pe :,,,,,,,,,,,, P+mp model :,,,,,,,,,,,, ate :,,,,,,,,,,,, #eas+re b*:,,,,,,,,,,,,
%tuffn& 'ox and %!ee$e (ata %heet
)A*
4
4 4
P 5
4 4
See spigot detail
4
Note: - Irrelevant dimensions and details to be marked as ‘X’. %ie&ing 'rom ‘!’( t)e End %ie&. Indi$ate &)i$) t*pe o' la*o+t.
SPEI!" #ark lo$ation
45º
Indi$ate &)i$) met)od - i' needed
N+mber o' st+ds:,,,,, 3oss
o+nterbore
St+d sie:,,,,, S$allop Slot Spigot detail dimension
!vailable area 'or sealing
/ption 0
4
/ption 1
#ark lo$ation o' 'l+s) and +en$) $onne$tion onne$tion sie: ,,,,,
4
/ption 2 S)eet 0 o' 1
1J
John Crane EAA GUIDE TO MEASUREMENT OF ROTATING ROTATING EQUIPMENT INTERNAL TO JOHN CRANE - NOT TO BE RELEASED TO EXTERNAL PARTIES PARTIES WITHOUT PERMISSION
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John Crane #e"han"a! sea!s Engineered Sealing Systems
%tuffn& 'ox and %!ee$e (ata %heet
1I
6 re'eren$e :,,,,,,,,,,,, P+mp t*pe :,,,,,,,,,,,, P+mp model :,,,,,,,,,,,, ate :,,,,,,,,,,,, #eas+re b*:,,,,,,,,,,,,
Sket$) and dimension sleeve detail
Sket$) and dimension ke*&a* detail
7eel 'ree to s$ribble o r sket$) an* relevant in'ormation
S)eet 1 o' 1
/riginal o$+ment dra'ted b* Nigel 6enkins
