IEC TS 60079 40 Edition 1 0 201 5 02 TECHNICAL SPECIFICATION Explosive atmospheres – Part 40 Requirements for process sealing between flammable process fluids and electrical systems IE C T S 6 0 0 7 9[.]
I EC TS 60079-40 ® Ed i ti on 201 5-02 TECH N I CAL SPECI FI CATI ON Expl osi ve atm osph eres – Part 40: Req u i rem en ts for process seal i n g between fl am m abl e process fl u i d s I EC TS 60079-40: 201 5-02(en ) an d el ectri cal system s TH I S P U B L I C ATI O N I S C O P YR I G H T P R O TE C TE D C o p yr i g h t © I E C , G e n e va , Sw i t z e rl a n d Al l or ri g h t s by re s e rv e d an y e i th e r m ean s , I EC c o p yri g h t yo u r I EC 3, or or l o cal de CH -1 21 I E C's h ave IEC C e n tral ru e U n l ess o t h e r wi s e e l e c t ro n i c or m e m be r an N at i o n al e n q u i ry m em be r s pe ci fi e d , m e ch an i c al , abo u t N ati o n al no p a rt i n cl u d i n g C o m m i tte e o btai n i n g C o m m i tte e th e th i s p u bl i cati o n co u n t ry ad d i ti o n al fo r O ffi ce in of ph o to co p yi n g f u rt h e r ri g h ts of to an d th e th i s re p ro d u c e d re q u e s te r If wi t h o u t yo u h ave pl e as e or u ti l i z e d p e rm i s s i o n an y co n tac t in in an y q u e s ti o n s th e f o rm wri t i n g f ro m ab o u t a d d re s s I EC bel ow or i n fo rm a t i o n Te l : +41 22 91 02 1 Fax: + 41 22 91 03 00 G e n e va i n fo @ i e c ch 20 be p u bl i cati o n , Vare m bé S wi t z e r l a n d m ay m i cro fi l m , ww w i e c c h Abo u t th e I E C Th e I n t e rn a t i o n a l I n te rn ati o n al E l e ct ro te c h n i cal S t a n d a rd s fo r al l Com m i ssi on e l e c t ri c a l , (I E C) e l e c t ro n i c is an d th e re l ate d l e ad i n g g l o b al o rg an i z ati o n th at p re p a re s an d pu bl i s h es tech n o l o g i es Ab o u t I E C p u b l i c a t i o n s Th e te c h n i cal l ate s t e d i ti o n , co n ten t a of IEC c o rri g e n d a p u bl i cati o n s or an is ke p t am e n d m e n t u n der might co n s tan t h ave be en I EC C atal og u e - webstore i ec ch /catal o g u e Th e s tan d - al o n e b i b l i o g rap h i cal Te c h n i cal ap pl i cati o n i n fo rm ati o n on S p e c i fi cati o n s , d o cu m e n ts Avai l ab l e fo r fo r I EC PC, M ac th e I n te rn ati o n al An d ro i d e n ti re S tan d ard s , R e po rts OS , an d o th e r Tab l e ts an d i P ad ad van ce d vari e t y of s e arch e n ab l e s cri t e ri a c o m m i tte e , … ) an d th e Th e wo rl d ' s e l e ctri c al wi th d wn It to ( re fe re n c e al s o g i ve s fi n d I EC i n fo rm ati o n on P l e as e m a ke s u re th at yo u h ave th e d e fi n i ti o n s in ad d i ti o n al on l i n e co n tai n i n g En g l i sh an d l an g u ag e s d i cti o n ary m o re Fre n c h , Al s o Vo c ab u l ary th an wi th e l e ctro n i c 000 as th e an d te rm s e q u i val e n t kn o wn ( I E V) of 30 te rm s an d in I n te rn ati o n al on l i n e I E C G l o ssary - s td i ec ch /g l ossary p u b l i c ati o n s n u m b e r, I E C l e ad i n g te rm s E l e c tro te ch n i cal I EC pu bl i cati on s search - www i ec ch /search pu b Th e by E l ectro ped i a - www el ectro ped i a org co n s u l ti n g Te ch n i cal re vi e w pu bl i s h e d t e xt , by a te ch n i c al p ro j e cts , re p l ace d M o re th an E n g l i sh c l au s e h ave p u bl i cati o n s 77, 60 an d of I EC been 86 an d 000 F re n c h e l e ctro te c h n i c al e xt rac te d p u b l i c ati o n s co l l e c te d fro m fro m i ssu ed e arl i e r te rm i n o l o g y th e Te rm s s i n ce an d 2002 pu b l i c ati o n s e n tri e s Som e of in D e fi n i ti o n s e n t ri e s I EC TC 7, CI SPR I EC J u st Pu bl i s h ed - webstore i ec ch /j u stp u bl i s h ed S ta y up d e tai l s al s o to al l o n ce d ate n ew a on al l n ew pu b l i c ati o n s m o n th by e m l I EC p u b l i c ati o n s re l e as e d J u st Avai l ab l e P u bl i s h ed on l i n e an d I E C Cu s to m er S ervi ce Cen tre - webstore i ec ch /csc If yo u n eed wi s h fu rth e r C e n tre : to g i ve us as s i s tan c e , cs c @ i e c ch yo u r fe e d b ack p l e as e co n tact on th e th i s p u b l i c ati o n C u s to m e r or S e rvi c e I EC TS 60079-40 ® Ed i ti on 201 5-02 TECH N I CAL SPECI FI CATI ON Expl osi ve atm osph eres – Part 40: Req u i rem en ts for process seal i n g between fl am m abl e process fl u i d s an d el ectri cal system s I N TERN ATI ON AL ELECTROTECH N I CAL COM M I SSI ON I CS 29 260 20 I SBN 978-2-8322-2248-5 Warn i n g ! M ake su re th at you obtai n ed th i s pu bl i cati on from an au th ori zed d i stri bu tor ® Reg i stered tradem ark of th e I n tern ati on al El ectrotech n i cal Com m i ssi on – – I E C TS 0 79 - 40 : 20 © I E C 20 C O N TE N TS F O R E WO R D S co p e N o rm a t i ve re f e re n c e s T e rm s an d d e f i n i t i o n s G e n e l re q u i re m e n ts B a s i s fo r r e q u i r e m e n t s S i n g l e p ro c e s s s e al e q u i p m e n t D u al p ro c e s s s e a l e q u i p m e n t 4 E q u i p m e n t wi th l i m i te d p re s s u r e a t th e e l e c tr i c a l c o n n e c t i o n s P u rg e d o r p re s s u ri z e d e q u i p m e n t Ad d - o n s e c o n d ar y p ro c e s s s e a l s An n u n c i a t o rs T y p e ve ri f i c a t i o n s a n d te s ts Tes t s am pl e S i n g l e p ro c e s s s e al e q u i p m e n t Ord e r o f co n d i ti o n i n g 2 Te m p e tu re c yc l i n g P re s s u re c yc l i n g 1 L e a ka g e te s t 5 B u rs t p re s s u r e t e s t 5 D u al p ro c e s s s e a l e q u i p m e n t P ri m ar y p r o c e s s s e a l l e a kag e t e s t P ri m ar y p r o c e s s s e a l b u rs t p re s s u re t e s t 3 V e n ti n g p re s s u re d e te rm i n a ti o n V e ri fi ca t i o n o f a n n u n c i a ti o n e ffe c t i ve n e s s 5 S e c o n d ar y p r o c e s s s e a l l e a kag e te s t V e ri fi c a t i o n o f l i m i te d p re s s u re e ff e c t i ve n e s s M a rki n g I n s tr u c t i o n s An n e x A ( i n fo rm a t i ve ) C o n d i ti o n i n g a n d te s t fl o wc h ar t B i b l i o g p h y F i g u re – E q u i p m e n t p ro c e s s s e a l i n g c o m p o n e n t s F i g u re – E x a m p l e s o f a d d - o n s e c o n d ar y p ro c e s s s e a l s F i g u re – Te m p e tu re c yc l e c o n d i t i o n i n g p ro fi l e 1 F i g u re A – C o n d i ti o n i n g an d t e s t fl o wc h ar t Ta b l e – L e aka g e t e s t p re s s u re s Ta b l e – B u rs t t e s t p re s s u re s I E C TS 0 79 - 40 : © I E C – – I N TE R N ATI O N AL E L E C TR O TE C H N I C AL C O M M I S S I O N EXPL OSI VE ATM OSPH ERES – Par t 40: Req u i r em en t s f o r p ro c es s s eal i n g b et w een f l am m ab l e p r o c es s f l u i d s an d el ec t ri c al s ys t em s F O R E WO R D ) T h e I n t e rn a t i o n a l E l e c t r o t e c h n i c a l C o m m i s s i o n ( I E C ) i s a wo rl d w i d e o r g a n i z a t i o n f o r s t a n d a r d i z a t i o n c o m p ri s i n g al l n ati o n al e l e ctro te ch n i cal co m m i ttees (I EC N ati o n al Co m m i ttees) Th e o bj ect of IEC is to pro m o te i n t e rn a t i o n a l c o - o p e r a t i o n o n a l l q u e s t i o n s c o n c e rn i n g s t a n d a rd i z a t i o n i n t h e e l e c t ri c a l a n d e l e c t r o n i c f i e l d s T o th i s end an d Te ch n i cal in ad d i ti o n R e po rts , to o th er P u bl i cl y acti vi ti e s , Avai l abl e IEC pu bl i sh es S pe ci fi cati o n s I n te rn ati o n al ( P AS ) an d S tan d ard s , Gu i d es Te ch n i cal ( h e re afte r S p e ci fi cati o n s , re f e r re d to as “I EC P u b l i c a t i o n ( s ) ” ) T h e i r p re p a r a t i o n i s e n t r u s t e d t o t e c h n i c a l c o m m i t t e e s ; a n y I E C N a t i o n a l C o m m i t t e e i n t e r e s t e d in th e su bj ect d e al t wi th m ay p arti ci p ate in th i s p re p a t o ry wo r k I n te rn ati o n al , g o v e r n m e n t a l o r g a n i z a t i o n s l i a i s i n g w i t h t h e I E C a l s o p a r t i c i p a t e i n t h i s p r e p a t i o n wi t h th e I n te rn ati o n al O rg an i z ati o n fo r S t a n d a rd i z a t i o n (I SO) in acco rd an ce wi t h g o ve rn m e n tal an d n on- I E C c o l l a b o t e s c l o s e l y co n d i ti o n s d e t e rm i n e d by a g r e e m e n t b e t w e e n t h e t w o o rg a n i z a t i o n s 2) T h e f o rm a l d e c i s i o n s o r a g re e m e n t s o f I E C o n t e c h n i c a l m a t t e rs e x p re s s , a s n e a rl y a s p o s s i b l e , a n i n t e r n a t i o n a l sen su s of opi n i on on th e re l e van t s u bj e cts si n ce e ach te ch n i cal com m i ttee h as re p r e s e n t a t i o n f ro m al l i n t e re s t e d I E C N a t i o n a l C o m m i t t e e s 3) IEC P u bl i cati o n s h a v e t h e f o rm C o m m i tte e s i n th at s e n s e P u bl i cati o n s is accu rate , o f re co m m e n d ati o n s Wh i l e al l IEC f o r i n t e rn a t i o n a l u se an d a re acce pte d b y I E C N ati o n al r e a s o n a b l e e f f o rt s a re m a d e t o e n s u re t h a t t h e t e c h n i c a l can n o t be h el d re s p o n s i b l e fo r th e wa y in wh i c h th e y a re co n ten t o f I E C used or fo r an y m i s i n te rp re tati o n b y an y e n d u s e r 4) In o rd e r to p ro m o t e tran s pare n tl y to i n te rn ati o n al th e m axi m u m u n i f o rm i t y , exte n t IEC possi bl e in N ati o n al th ei r Co m m i ttee s n ati on al an d u n d e r t a ke re g i o n al to appl y IEC pu bl i cati o n s P u bl i cati on s An y d i ve rg e n ce b e t w e e n a n y I E C P u b l i c a t i o n a n d t h e c o r re s p o n d i n g n a t i o n a l o r r e g i o n a l p u b l i c a t i o n s h a l l b e c l e a rl y i n d i c a t e d i n t h e l a t t e r 5) I E C i ts e l f d o e s n o t p ro vi d e an y atte s tati o n a s s e s s m e n t s e rv i c e s a n d , in s o m e are as , o f c o n f o rm i t y I n d e p e n d e n t c e rt i f i c a t i o n a c c e s s t o I E C m a rks o f c o n f o rm i t y b o d i e s p ro vi d e c o n f o r m i t y I E C i s n o t re s p o n si b l e fo r an y s e rv i c e s c a r r i e d o u t b y i n d e p e n d e n t c e r t i f i c a t i o n b o d i e s 6) A l l u s e rs s h o u l d e n s u r e t h a t t h e y h a v e t h e l a t e s t e d i t i o n o f t h i s p u b l i c a t i o n 7) N o l i a b i l i t y s h a l l a t t a c h t o I E C o r i t s d i re c t o rs , e m p l o ye e s , s e r v a n t s o r a g e n t s i n c l u d i n g i n d i v i d u a l e x p e r t s a n d m e m b e rs o f i t s t e c h n i c a l c o m m i t t e e s a n d I E C N a t i o n a l C o m m i t t e e s f o r a n y p e r s o n a l i n j u r y , p ro p e r t y d a m a g e o r o th e r d am ag e e xpen ses of an y a ri s i n g ou t n atu re wh a t s o e v e r, wh e th e r of p u bl i cati o n , use th e o f, d i re c t or or i n d i re c t , re l i an ce u pon , or th i s fo r co sts IEC (i n cl u d i n g P u bl i cati o n or l e g al fe es) an d an y oth er I EC P u bl i cati o n s 8) A t t e n t i o n i s d w n t o t h e N o r m a t i v e re f e r e n c e s c i t e d i n t h i s p u b l i c a t i o n U s e o f t h e re f e r e n c e d p u b l i c a t i o n s i s 9) A t t e n t i o n i s d wn t o t h e p o s s i b i l i t y t h a t s o m e o f t h e e l e m e n t s o f t h i s I E C P u b l i c a t i o n m a y b e t h e s u b j e c t o f i n d i s p e n s abl e fo r th e co rre ct ap p l i cati o n o f th i s p u b l i cati o n p a t e n t r i g h t s I E C s h a l l n o t b e h e l d r e s p o n s i b l e f o r i d e n t i f y i n g a n y o r a l l s u c h p a t e n t ri g h t s Th e m n ta s k of I EC t e ch n i c a l c o m m i t te e s is to p re p a re I n t e rn a t i o n a l S t a n d a rd s In e x c e p t i o n al c i rc u m s tan c e s , a te c h n i c a l c o m m i t te e m a y p ro p o s e t h e p u b l i c a t i o n o f a t e c h n i c al s p e c i f i c a t i o n wh e n • t h e re q u i re d s u p p o r t c a n n o t b e o b t a i n e d fo r t h e p u b l i c a t i o n o f an I n t e r n a t i o n a l S ta n d a rd , d e s p i te r e p e a t e d e f fo rts , o r • t h e s u b j e c t i s s ti l l u n d e r t e c h n i c a l d e ve l o p m e n t o r wh e re , fo r a n y o th e r re a s o n , th e re i s th e f u t u re b u t n o i m m e d i a t e p o s s i b i l i t y o f a n a g re e m e n t o n a n I n t e r n a t i o n a l S ta n d a rd Te ch n i c a l s p e ci fi c a t i o n s a re su bj ect to re vi e w wi th i n t h re e y e a rs of pu bl i cati o n to d eci d e wh e th e r t h e y c a n b e t n s f o rm e d i n to I n te rn a t i o n a l S ta n d ar d s I EC 60079-40, wh i c h is a t e c h n i c al s p e c i fi c a t i o n , co m m i t t e e : E q u i p m e n t f o r e x p l o s i ve a tm o s p h e re s h as been p r e p a re d by IEC te c h n i c a l – – I E C TS 0 79 - 40 : 20 © I E C 20 Th e te x t o f th i s te c h n i c a l s p e c i f i c a t i o n i s b as e d o n t h e fo l l o wi n g d o c u m e n t s : E n q u i ry d f t R e p o r t o n vo t i n g /1 /D T S /1 /R V C F u l l i n fo rm a ti o n o n t h e vo t i n g fo r th e a p p ro val o f t h i s t e c h n i c al s p e ci fi c at i o n c an b e fo u n d i n t h e re p o rt o n vo ti n g i n d i c a t e d i n th e a b o ve t ab l e Th i s p u b l i c at i o n h as b e e n d f te d i n ac c o rd an c e wi th t h e I S O /I E C D i re c t i ve s , P a rt A list of al l p a rts in th e I EC 60079 s e ri e s , atmospheres, c a n b e fo u n d o n th e I E C we b s i t e pu bl i sh ed u n der th e g e n e ral t i tl e Explosive Th e c o m m i t t e e h as d e c i d e d t h a t th e c o n te n ts o f t h i s p u b l i cat i o n wi l l re m n u n c h an g e d u n t i l th e s t ab i l i t y d ate i n d i cate d on th e I EC we b s i te u n der " h tt p : //w e b s to re i e c c h " re l a te d t o t h e s p e c i fi c p u b l i c a t i o n At t h i s d a te , th e p u b l i c at i o n wi l l b e • t n s fo rm e d i n to an I n t e rn a ti o n a l s t an d ard , • re c o n f i rm e d , • wi th d rawn , • re p l ac e d b y a re vi s e d e d i t i o n , o r • am e n d e d A b i l i n g u al ve rs i o n o f th i s p u b l i c at i o n m ay b e i s s u e d at a l at e r d a te in th e d at a I E C TS 0 79 - 40 : © I E C – – EXPL OSI VE ATM OSPH ERES – Par t 40: Req u i r em en t s f o r p ro c es s s eal i n g b et w een f l am m ab l e p r o c es s f l u i d s an d el ec t ri c al s ys t em s Sc o p e Th i s d o cu m e n t p ro vi d e s s p e c i fi c re q u i re m e n ts fo r p ro c e s s s eal i n g b e twe e n a fl am m abl e p ro c e s s fl u i d a n d a n e l e c t ri c a l s ys te m wh e re a fa i l u r e c o u l d a l l o w th e m i g t i o n o f t h e p ro c e s s fl u i d d i r e c tl y i n t o t h e p r e m i s e s wi ri n g s ys te m N O TE Some fl as h p o i n ts d e fi n i ti o n s Co m b u s ti bl e d i ffe re n ti ate liquids th e u nder te rm s “fl am m abl e ” d i ti o n s of an d e l evated “co m bu s ti bl e ” p re s s u re a n d /o r liquids on th e t e m p e r a t u re b as i s can of l e ad to th ei r th e f o rm a t i o n o f f l a m m a b l e m i s t s a n d a e r o s o l s wh i c h a r e w i t h i n t h e s c o p e o f t h i s t e c h n i c a l s p e c i f i c a t i o n Th i s d ocu m en t c o n t n s r e q u i re m e n ts fo r e val u a ti o n , c o n s tru c t i o n an d t e s ti n g of single p ro c e s s s e a l e q u i p m e n t , d u a l p ro c e s s s e a l e q u i p m e n t , a n d a d d - o n s e c o n d ar y p r o c e s s s e a l s Th e re q u i re m e n ts o f th i s d o c u m e n t d o n o t a p p l y t o co n d u i t s e al i n g d e vi c e s , c a b l e g l a n d s a n d o t h e r wi r i n g s e a l i n g m e t h o d s a d d r e s s e d i n t h e I E C 0 s e ri e s o r o th e r s t a n d a rd s R e q u i re m e n t s fo r b a s i c e l e c t ri c a l s a fe t y a n d e xp l o s i o n p ro te c t i o n are n o t a d d re s s e d b y t h i s d o c u m e n t , b u t m a y a p p l y t o t h e e q u i p m e n t u n d e r i n ve s t i g a t i o n Th e e ff e c t s o f l e a kag e t o t h e e n vi ro n m e n t a re n o t a d d r e s s e d b y t h i s d o c u m e n t N o r m at i v e r ef er en c es Th e fo l l o wi n g d o c u m e n ts , i n wh o l e o r i n p a rt , are n o rm a ti ve l y r e fe re n c e d i n t h i s d o c u m e n t a n d a re i n d i s p e n s a b l e fo r i ts a p p l i c a t i o n F o r d a t e d re f e re n c e s , o n l y t h e e d i ti o n c i t e d ap p l i e s F o r u n d ate d re fe re n c e s , th e l ate st e d i ti o n of th e r e fe re n c e d d ocu m e n t (i n cl u d i n g an y am e n d m e n ts) appl i e s I EC 60079-0, Explosive atmospheres – Part 0: Equipment – General requirements I EC 60079-2, Explosive atmospheres – Part 2: Equipment protection by pressurized enclosure "p" Ter m s an d d ef i n i t i o n s F o r th e p u rp o s e s o f th i s d o c u m e n t t h e fo l l o wi n g te rm s a n d d e fi n i ti o n s a p p l y N O TE S e e F i g u re f o r a g p h i c a l r e p r e s e n t a t i o n o f t h e v a r i o u s p r o c e s s s e a l c o m p o n e n t s – – I EC TS 60079-40:201 © I EC 201 P re m i s e s Wi ri n g S ys te m S e co n d ary P ro ce s s S e al s Ve n t E l e ctri cal ( wh e n E q u i pm en t p ro vi d e d ) P ri m ary P ro ce s s S e al P ro ce s s Fl u i d IEC Fi g u r e – Eq u i p m en t p ro c es s s eal i n g c o m p o n en t s d u al p ro c es s equ i pm en t s e al an d s eal wh i ch on e i n d epen d en t co n tai n m e n t eq u i p m en t i n co rp o te s , or m o re p ro c e s s i n to th e al o n g s e co n d ary s e al s is an y re q u i re d pre m i s e s singl e p ro c e s s wi ri n g to po te n ti al s e al s al l o w su ch m i g rati o n of l e aka g e th at p ath , th e a p ri m ary fai l u re p ro ce s s fl u i d s of fro m two th e i r p ro ce s s or m o re desi g n ed s ys te m p ro c es s c o n n ec t ed e l e c tri c al s ys te m eq u i p m en t eq u i pm en t th at th at co n tai n s th e co n tai n s p ro ce s s a p ro ce s s seal an d is i n te n d e d fo r co n n e cti o n to an e x te rn al fl u i d 3 p ro c es s g as , N ote fl u i d liqui d to or va p o u r e n t ry: fl am m abl e Fo r p ro c e s s th at th e fl u i d is u sed p u rp o s e s For fu rth e r in of or th i s is a b y - p ro d u c t te ch n i cal i n fo rm a ti o n , re fe r of an s pe ci fi cati o n , to I EC 60079-0, i n d u s tri al u se I EC of th e pro ce s s te rm 60079-1 0-1 , p ro ce s s an d I EC fl u i d re f e rs to a 60079-20-1 p ro c es s se al th e m i g rati o n N ote u n u su al I EC s eal b e twe e n to th e of e n try: e l e ctri cal th e Al th o u g h co n d i ti o n s , s ys te m p ro ce s s th i s an fl u i d e n t i re tech n i cal an d i n to a th e fl am m abl e p re m i s e s co n tai n m e n t s pe ci fi cati o n s ys te m re c o g n i z e s p ro c e s s wi ri n g m ay th e fl u i d wh e re a fai l u re co u l d al l ow s ys te m co n s ti tu te cept of a p o te n ti al i n fal l i bl e s o u rc e of tai n m e n t re l e as e as u nd er d efi n ed i n 60079-2 si n g l e p ro c es s equ i pm en t s tru c tu re th e N ote su ch desi g n ed to n eg l i g i bl e s eal th at e n t ry: eq u i p m en t i n co rp o rate s , th at a fai l u re co n tai n m e n t Si n g l e p ro b a b i l i ty of i n to p ro ce s s f l u re al o n g of th e th e se al wh e n an y s e al pre m i s e s eq u i pm en t u sed si ng l e wo u l d i n wi ri n g i n p o te n ti al re s u l t in wi th l e a ka g e m i g rati o n path , of a si ng le th e p ro ce s s i s co n s i d e re d s e al i n g fl u i d fro m s ys te m co m pl i an ce acc o rd an c e th e th e wi t h th i s d ocu m en t m an u factu re r' s s p e ci fi cati o n to h ave a I E C TS 0 79 - 40 : © I E C – – p r i m ar y p r o c es s s eal p ro c e s s seal th a t is d i re ctl y in c o n ta c t wi t h p ro c e s s fl u i d s u n der c o n d i ti o n s of n o rm al o p e ti o n s e c o n d ar y p r o c e s s s e al p ro c e s s s e a l t h a t c o m e s i n t o co n t a c t wi th p ro c e s s fl u i d s o n l y i n t h e c a s e o f a p r i m a ry p ro c e s s s e a l fa i l u re p r o c e s s s eal w i t h m o v i n g p ar t s p ro c e s s s e al c o n ta i n i n g m e ch a n i c al p a r ts th a t , u n der co n d i ti o n s of n o rm a l o p e rat i o n , a re ca p ab l e o f m o t i o n r e l a ti ve t o o t h e r p a rts o f t h e s e al N ote t o e n t r y: E x a m p l e s i n c l u d e s e a l s o f s h a f t s a n d r o d s t h a t t n s m i t r o t a ry o r l i n e a r m o t i o n i n t o t h e s e a l e d a r e a P ro c e s s s e a l s i n c o rp o t i n g t h e f o l l o wi n g a r e n o t c o n s i d e r e d t o b e p ro c e s s s e a l s wi t h m o v i n g p a rt s : a) T h i n d i a p h g m s a n d o t h e r s t ru c t u re s t h a t m a y d e f l e c t wh e n p r e s s u r i z e d ; b) V i b r a t i n g s t r u c t u r e s s u c h a s t u n i n g f o rks , c o r i o l i s t u b e s , a n d v o r t e x s e n s o rs u n s p ec i f i ed p r o c es s c o n n ec t ed eq u i p m en t e q u i p m e n t n o t as s e s s e d i n ac c o rd a n c e w i th th i s d o c u m e n t b u t d e s i g n e d i n a cc o rd a n c e wi t h a p p l i c ab l e s ta n d a rd s fo r t h e s p e c i fi c ty p e o f e q u i p m e n t ad d - o n s ec o n d ar y p r o c es s s e al s e c o n d a ry p ro c e s s s eal i n te n d e d to be i n s t al l e d b e twe e n e q u i p m e n t an d t h e p re m i s e s wi r i n g s ys t e m ( s e e F i g u re ) u n spe ci fi e d p ro c e s s c o n n e c te d – – I E C TS 0 79 - 40 : 20 © I E C 20 U n speci fi ed process Prem i ses n ected eq u i pm en t Wi ri n g System El ectri cal Eq u i pm en t Ad d -on Secon d ary Process Seal Pri m ary Ven t Process Seal (wh en provi d ed ) Process Fl u i d U n speci fi ed eq u i pm en t Prem i ses Wi ri n g wi th pri m ary process seal System Ad d -on Secon d ary Process Seal IEC F i g u r e – E x am p l e s o f a d d - o n s e c o n d a r y p r o c e s s s e a l s 1 e q u i p m en t w i t h l i m i t e d p r e s s u r e at t h e e l ec t r i c al c o n n e c t i o n s p ro c e s s c o n n e c te d e q u i p m e n t t h a t i s te d fo r a m a x i m u m p r o c e s s p re s s u re o f , kP a g a u g e o r i s p ro vi d e d w i th a d i n , ve n t o r o th e r m e an s s u ff i c i e n t to p re ve n t p r e s s u ri z i n g t h e p re m i s e s wi r i n g c o n n e c t i o n ab o ve , kP a i n th e e ve n t o f a fa i l u re o f th e p ri m a ry p ro c e s s s e a l p r em i s es w i r i n g (s y s t em ) i n te ri o r a n d e x t e r i o r wi r i n g , i n c l u d i n g p o we r, l i g h t i n g , co n tro l , a n d s i g n al c i rc u i t wi r i n g t o g e t h e r wi t h al l th ei r as s o c i a t e d h a rd wa re , fi tti n g s , an d wi r i n g d e vi c e s , b o th p e rm an e n t l y an d t e m p o ri l y i n s t a l l e d i n c l u d i n g ( a ) wi ri n g fro m t h e s e r vi c e p o i n t o r p o we r s o u rce to t h e o u tl e ts or (b) wi r i n g f ro m an d i n cl u d i n g th e p o we r s o u rc e t o th e o u t l e ts wh e r e t h e re i s n o s e rvi ce poi n t N ote to e n try: S u c h w i ri n g d o e s n o t i n c l u d e wi r i n g i n t e rn a l t o a p p l i a n c e s , l u m i n a i re s , m o t o rs , c o n t ro l l e rs , m o t o r c o n t r o l c e n t re s , a n d s i m i l a r e q u i p m e n t 3 ae r o s o l s u s p e n s i o n i n r o r g as o f s o l i d o r l i q u i d p a r ti c l e s 4 G e n e r al r e q u i r e m e n t s B as i s f o r r eq u i r e m en t s Th e m an u fa c tu re r’ s p r o c e s s s e a l s p e c i fi c a ti o n s s h al l i n c l u d e th e fo l l o wi n g : I E C TS 0 79 - 40 : © I E C a) P ro c e s s te m p e tu re n g e – – ( th e pro ce s s s e al t e m p e tu re m ay be d i ffe r e n t th an th e p u b l i s h e d p ro c e s s t e m p e r at u re r an g e fo r t h e e q u i p m e n t) ; b) Wo rki n g p re s s u re n g e ; c) P ro c e s s we tt e d m a t e ri a l s o f c o n s tru c t i o n N O TE I t i s a s s u m e d f o r t h e p u r p o s e s o f t h i s d o c u m e n t t h a t i n s t a l l e rs w i l l f o l l o w s t a n d a rd e n g i n e e ri n g p c t i c e a n d a d h e r e t o i n d u s t r y s t a n d a rd s f o r t h e s e l e c t i o n , i n s t a l l a t i o n , a n d o p e t i o n o f e q u i p m e n t t h a t c o n t a i n s p ro c e s s s e al s U n der n o rm a l o p e t i n g co n d i t i o n s , fl am m abl e p ro c e s s fl u i d s s h al l not be re l e a s e d to th e a t m o s p h e re N O TE It is not a re q u i re m e n t of th i s te ch n i cal speci fi cati on th at p re v e n t i o n of p ro ce s s fl u i d l e a ka g e to th e a t m o s p h e r e b e v e ri f i e d S i n g l e p r o c e s s s eal e q u i p m en t S i n g l e p r o c e s s s e a l e q u i p m e n t s h a l l b e s u b j e c te d t o t h e co n d i ti o n i n g a n d ac c e p tan c e t e s ts spe ci fi e d in Si ngle p ro c e s s s eal eq u i pm en t s h al l not d epen d u pon B o u rd o n tu b e s or p ro c e s s s e a l s wi th m o vi n g p a rts a s t h e p r i m a r y p ro c e s s s e a l D u al p r o c es s s e al eq u i p m en t D u a l p ro c e s s s e al e q u i p m e n t s h a l l b e t e s te d i n a c c o rd a n ce wi t h D u a l p r o c e s s s e a l e q u i p m e n t i n c o r p o t i n g a p u rg e o r p re s s u ri z a ti o n o f t h e s p a c e b e twe e n t h e p ri m ar y a n d s e c o n d a r y p ro c e s s s e al s s h a l l c o m p l y wi th th e re q u i re m e n t s o f I E C 0 - re l e van t t o th e p u rg i n g an d p re s s u ri z a t i o n a p p a t u s Th e d e s i g n a n d m an u fa c tu re o f s e a l s i n co rp o te d i n to e q u i p m e n t wi t h n o an n u n c i a t i o n an d n o ve n t i n g s h al l m i n i m i z e t h e p ro b ab i l i t y o f c o m m o n m o d e fa i l u re N O TE F o r d u a l p ro c e s s s e a l e q u i p m e n t i n c o r p o r a t i n g a n n u n c i a t i o n o f a p ri m a ry p r o c e s s s e a l f a i l u re , l o n g t e rm d e g r a d a t i o n o f t h e p ri m a r y a n d s e c o n d a ry p ro c e s s s e a l s o f d u a l p r o c e s s s e a l e q u i p m e n t i s n o t c o n s i d e r e d N O TE 4 L o c a l , n a t i o n a l o r e n d u s e r r e g u l a t i o n s c a n m a n d a t e a d d i t i o n a l re q u i re m e n t s E q u i p m e n t w i t h l i m i t e d p r e s s u r e at t h e e l ec t r i c al c o n n e c t i o n s Eq u i pm en t th a t is te d for a m axi m u m p ro c e s s p r e s s u re of , kP a g au g e n eed not be s u b j e c te d to t h e c o n d i t i o n i n g a n d te s t i n g re q u i r e m e n t s o f th i s te ch n i c a l s p e c i fi c a ti o n an d i s co n s i d e r e d to m e e t t h e re q u i re m e n t s o f t h i s t e c h n i ca l s p e c i fi c a t i o n E q u i p m e n t t e d a b o ve , kP a a n d p ro vi d e d wi t h a d r n , ve n t o r o t h e r m e a n s s u f fi c i e n t t o p re ve n t p re s s u ri z i n g t h e p re m i s e s wi ri n g c o n n e c ti o n a b o ve , kP a i n t h e e ve n t o f a fa i l u r e o f t h e p r i m ar y p ro c e s s s e a l s h al l b e e val u a t e d i n a cc o rd a n c e wi th Pu r g ed o r p r es s u r i zed eq u i p m en t P ro c e s s co n n ecte d equ i pm en t u sin g c o n ti n u o u s - f l o w p u rg e d e n c l o s u re s or p re s s u ri z e d e q u i p m e n t wi th i n fa l l i b l e c o n ta i n m e n t th a t m e e t s th e re q u i re m e n ts o f I E C 0 - o r s i m i l a r te c h n i q u e s s u c h th a t a l e a k o f t h e c o n ta i n m e n t c a n n o t p r o d u ce a f l a m m a b l e m i x tu re i n th e e n c l o s u re n e e d n o t b e s u b j e c t t o t h e c o n d i ti o n i n g an d t e s ti n g o f t h i s t e c h n i c al s p e c i f i c a ti o n , a n d i s c o n s i d e re d to m e e t t h e re q u i re m e n ts o f th i s te ch n i c a l s p e c i f i c a t i o n N O TE T h i s re q u i r e m e n t i s n o t m e a n t t o a p p l y t o p u r g e d o r p re s s u ri z e d r o o m s wh i c h a r e a d d r e s s e d i n I E C 0 - an d I E C TR 0 - A d d - o n s e c o n d ar y p r o c e s s s e a l s Ad d - o n s e co n d a r y p ro c e s s s e a l s s h al l b e s u b j e c t e d t o th e s e c o n d ar y p ro c e s s s e a l l e aka g e t e s t o f a n d s h al l b e m a rke d i n a c co rd a n c e wi t h C l a u s e i t e m d ) – – I E C TS 0 79 - 40 : 20 © I E C 20 A n n u n c i at o r s L e aka g e an n u n c i at i o n m ay be ac h i e ve d ei th e r th ro u g h th e i n cl u si on of a ve n t or d rai n b e twe e n th e p ri m ary an d s e c o n d ary p ro c e s s s e a l s o r b y e l e c t ro n i c s e n s i n g o r o th e r s u i t ab l e m e a n s An n u n c i a ti o n m e t h o d s i n c l u d e b u t are n o t l i m i t e d t o : • au d i b l e “ wh i s t l e " ; • vi s i b l e ru p tu re o r l e akag e ; • e l e c t ro n i c d e t e c ti o n ; a n d • d e t e c ta b l e fa i l u re o f th e e q u i p m e n t t o o p e te as i n t e n d e d Ty p e v e r i f i c at i o n s Te s t an d t es t s s am p l e P ri o r t o c o n d i t i o n i n g an d t e s t , t h e s a m p l e s h a l l b e vi s u a l l y i n s p e c t e d to e n s u re th a t i t i s i n co m p l i an c e wi th d e s i g n d o c u m e n ts A s i n g l e re p re s e n t a ti ve te s t s a m p l e s h al l b e s u b j e c te d t o t h e t e s t s o f e i th e r o r d e p e n d i n g o n wh e th e r t h e s am p l e i s t o b e as s e s s e d as s i n g l e o r d u a l p ro c e s s s e al e q u i p m e n t I n e ac h t e s t re q u i ri n g th e ap p l i c at i o n o f p re s s u re to th e p ro ce s s s e al o r p arts o f t h e p ro c e s s s e al , a s u i t ab l e fl u i d s h al l b e u s e d U n l e s s o t h e rwi s e s t at e d , a l l t e s t s re q u i re d b y th i s d o c u m e n t s h a l l b e c o n d u c t e d a t a t e m p e rat u re o f ( ± ) °C an d a t s ta n d a rd a tm o s p h e ri c p re s s u re as d e fi n e d b y I E C 0 - A fl o wc h art o f t h e c o n d i ti o n i n g an d te s t p ro c e s s c an b e f o u n d i n An n e x A Si n g l e p ro c es s Or d er of s eal eq u i p m en t d i ti on i n g Th e te s t s am p l e s h al l b e s u b j e c te d t o t h e re q u i re d c o n d i t i o n i n g i n th e fo l l o wi n g o rd e r: a) T e m p e tu re c yc l i n g ; b) P re s s u re c yc l i n g Aft e r th e p re s c ri b e d d i ti o n i n g is c o m p l e te d , th e te s t s am p l e s h al l be s u b j e c te d to th e l e akag e an d b u rs t p re s s u re te s t s o f a n d 2 For Te m p e r at u r e eq u i pm en t ce ram i c , a cycl i n g i n c o rp o t i n g re p re s e n ta t i ve p ro c e s s s am p l e of s e al s th e wi t h n o n - m e ta l l i c p ro c e s s s eal sh al l p arts be e xcl u d i n g s u bj ecte d to g l as s an d te m p e t u re c yc l i n g c o n d i t i o n i n g as fo l l o ws : N O TE N o rm al l y, th e e q u i pm e n t o r parts o f th e e q u i p m e n t co n tai n i n g th e p ro ce s s s e al u n d e r te s t i s pl ace d i n an e n v i r o n m e n t a l c h a m b e r T h i s t e s t i s n o t i n t e n d e d t o a p p l y a t h e rm a l s h o c k o r t h e r m a l g d i e n t t o t h e p r o c e s s s e a l D u t i o n : A minimum o f we e ks o r c yc l e s ( wh i c h e ve r o c c u rs fi rs t) M a x i m u m Te m p e tu re ( T m ax ): M an u fac t u re r’ s m a x i m u m rat e d p ro c e s s s e al t e m p e rat u re i n c re as e d b y at l e as t K b u t a t m o s t K M i n i m u m Te m p e rat u re ( T ): M an u fac tu re r’ s minimum rat e d p ro c e s s s e al t e m p e tu re re d u c e d b y a t l e as t K b u t a t m o s t K S t a b i l i z at i o n : T h e fi n al t e m p e tu re i s c o n s i d e re d t o h a ve b e e n re ac h e d wh e n th e rat e o f ch an g e o f te m p e t u re d o e s n o t e x ce e d K/h I f , u n d e r n o rm a l o p e t i n g co n d i t i o n s , t h e te m p e t u re o f th e p ro ce s s s e a l i s m a i n ta i n e d s u ch t h a t th e m a x i m u m f l u c tu at i o n i s l i m i te d t o K, th e te m p e tu re c yc l i n g m a y b e wa i ve d IEC TS 60079-40:201 © IEC 201 – 11 – See the profile in Figure for a graphical representation of the temperature cycling conditioning < 2K/h Tmax time Tmin IEC Fi g u r e – Te m p e r at u r e cycl e d i ti on i n g pro fi l e As an alternative to the conditioning shown in Figure 3, the manufacturer may provide evidence in support of the ability of the process seal to withstand the effect of temperature variation NOTE It is not a requirement of this technical specification that the accuracy of the manufacturer’s temperature cycling or evaluation needs to be verified Pr es s u r e cycl i n g Process seals shall be conditioned by pressure cycling A representative sample of the process seal shall be cyclically pressurized and depressurized as follows: Duration: At least 00 000 cycles Manufacturer’s rated maximum working pressure Maximum Pressure ( P max ): Manufacturer’s rated minimum working pressure (vacuum Minimum Pressure ( P ): applications) Dwell Time: First 000 Cycles: At least minute at maximum pressure followed by at least minute at minimum pressure Remaining 90 000 cycles: At least seconds at maximum pressure followed by at least seconds at minimum pressure For equipment not rated for vacuum applications, the dwell time at the minimum pressure may be reduced to second Positive and negative pressure cycling may be done in separate cycles Process seals need not be subjected to vacuum pressure conditioning if the vacuum pressure range is less than % of the full working pressure range of the equipment If, under normal operating conditions, the pressure applied to the process seal is maintained such that the maximum fluctuation is limited to 34,5 kPa, the pressure cycling may be waived As an alternative to the above conditioning, the manufacturer may provide evidence in support of the ability of the process seal to withstand the effect of foreseeable pressure variation – N O TE It v a ri a t i o n is Th e not a re q u i re m e n t e val u ati o n n eeds L e ak ag e p ro c e s s of be th i s tech n i cal s h al l wi th s tan d P worki n g B u rs t p ro ce s s