Iec Ts 60079-40-2015.Pdf

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[.]

and electrical sy stems

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Ce tr e: csc@ie c

and electrical sy stems

CONTENTS

FOREWORD 3

1 Sco e 5

2 Normative referen es 5

3 Terms an definition 5

4 General req irements 8

4.1 Basis for req irements 8

4.2 Sin le proces se l eq ipment

9 4.3 Dual proces se l eq ipment 9

4.4 Eq ipment with l mited pres ure at the electrical con ection 9

4.5 Purged or pres urized eq ipment 9

4.6 Ad -on secon ary proces se ls 9

4.7 An u ciators 10 5 Typ verification an tests 10 5.1 Test sample 10 5.2 Sin le proces se l eq ipment 10 5.2.1 Order of con itionin 10 5.2.2 Temp rature c cl n 10 5.2.3 Pres ure c cln 1

5.2.4 L a age test 12 5.2.5 Burst pres ure test 12 5.3 Dual proces se l eq ipment 12 5.3.1 Primary proces se l le k ge test 12 5.3.2 Primary proces se l burst pres ure test 12 5.3.3 Ventin pres ure determination 12 5.3.4 Verification of an u ciation ef ectivenes 13 5.3.5 Secon ary proces se l le k ge test 13 5.4 Verification of l mited pres ure efectivenes 13 6 Markin 13 7 In tru tion 13 An ex A (informative) Con itionin an test flowc art 15 Bibl ogra h 17 Fig re 1 – Eq ipment proces se l n comp nents 6

Fig re 2 – Examples of ad -on secon ary proces se ls 8

Fig re 3 – Temp rature c cle con itionin profi e 1

Fig re A.1 – Con itionin an test flowc art 16

Ta le 1 – L a age test pres ures 12

Ta le 2 – Burst test pres ures 12

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Tec nical sp cification are s bject to review within thre ye rs of publ cation to decide

whether they can b tran formed into International Stan ard

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The text of this tec nical sp cification is b sed on the folowin doc ments:

Ful information on the votin for the a proval of this tec nical sp cification can b fou d in

the re ort on votin in icated in the ab ve ta le

This publcation has b en drafed in ac ordan e with the ISO/IEC Directives, Part 2

A l st of al p rts in the IEC 6 0 9 series, publ s ed u der the general title Ex losiv

atmosp heres, can b fou d on the IEC we site

The commit e has decided that the contents of this publ cation wi remain u c an ed u ti

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related to the sp cific publ cation At this date, the publ cation wi b

• tran formed into an International stan ard,

EXPLOSIVE ATMOSPHERES –

Part 40: Requirements for process seal ng between

flammable process fluids and electrical systems

This doc ment provides sp cific req irements for proces se ln b twe n a flamma le

proces fluid an an electrical s stem where a fai ure could al ow the migration of the proces

fluid directly into the premises wirin s stem

NOT Some d finitio s difere tiate th terms “flamma le” a d “c mb stible” lq ids o th b sis of th ir

flash oints Comb stible lq ids u d r c n itio s of ele ate pres ure a d/or temp rature c n le d to th

formatio of flamma le mists a d a rosols whic are within th sc p of this te h ic l sp cific tio

This doc ment contain req irements for evaluation, con tru tion an testin of sin le

proces se l eq ipment, d al proces se l eq ipment, an ad -on secon ary proces se ls

The req irements of this doc ment do not a ply to con uit se ln devices, ca le glan s an

other wirin se l n method ad res ed in the IEC 6 0 9 series or other stan ard

Req irements for b sic electrical safety an explosion protection are not ad res ed by this

doc ment, but may a ply to the eq ipment u der in estigation The ef ects of le k ge to the

en ironment are not ad res ed by this doc ment

2 Normativ referenc s

The folowin doc ments, in whole or in p rt, are normatively referen ed in this doc ment an

are in isp n a le for its a pl cation For dated referen es, only the edition cited a pl es For

u dated referen es, the latest edition of the referen ed doc ment (in lu in an

amen ments) a pl es

IEC 6 0 9-0, Ex losiv atmosp he re s – Part 0 : Equipme nt – G en ral re u irem ents

IEC 6 0 9-2, Ex losiv atmosp he re s – Part 2: Equipme nt protecto b y p re ssurized e closure

"p"

3 Terms and definitions

For the purp ses of this doc ment the folowin terms an definition a ply

Electr i al Equipme t

Proces Fluid

Primar y

Pr oces

Se lElectr i al Equipme t

eq ipment whic in orp rates, alon an sin le p tential le k ge p th, a primary proces

se l an one or more secon ary proces se ls s c that the faiure of two or more

in e en ent proces se ls is req ired to al ow migration of proces fluid from their desig ed

containment into the premises wirin s stem

3.2

proces con ected equipment

electrical eq ipment that contain a proces se l an is inten ed for con ection to an external

s stem that contain the proces fluid

3.3

proces fluid

gas, l q id or va our that is u ed in or is a by-prod ct of an in u trial proces

Note 1 to e try: For th p rp ses of this te h ic l sp cific tio , use of th term pro es fluid refers to a

flamma le pro es fluid For furth r informatio , refer to IEC 6 0 9-0, IEC 6 0 9-10-1, a d IEC 6 0 9-2 -1

3.4

proces se l

se l b twe n the electrical s stem an a flamma le proces fluid where a fai ure could alow

the migration of the proces fluid into the premises wirin s stem

Note 1 to e try: Alth u h a e tire c ntainme t system ma c nstitute a p te tial so rc of rele se u d r

u usu l c n itio s, this te h ic l sp cific tio re o nizes th c n e t of infal ble c ntainme t as d fin d in

IEC 6 0 9-2

3.5

single proces se l eq ipment

eq ipment that in orp rates, alon an sin le p tential le k ge p th, a sin le se l n

stru ture s c that a fai ure of the se l would res lt in the migration of the proces fluid from

the desig ed containment into the premises wirin s stem

Note 1 to e try: Sin le pro es se l e uipme t in c mpla c with this d c me t is c nsid re to h v a

proces se l containin mec anical p rts that, u der con ition of normal o eration, are

ca a le of motion relative to other p rts of the se l

Note 1 to e try: Ex mples in lu e se ls of sh fs a d ro s th t tra smit rotary or ln ar motio into th se le

are Pro es se ls in orp ratin th folowin are n t c nsid re to b pro es se ls with mo in p rts:

a) Thin dia hra ms a d oth r stru tures th t ma d fle t wh n pres urize ;

b) Vibratin stru tures su h astu in forks, c riols tu es, a d v rte se sors

3.9

unspecified proces connected eq ipment

eq ipment not as es ed in ac ordan e with this doc ment but desig ed in ac ordan e with

a pl ca le stan ard for the sp cific typ of eq ipment

3.10

add-on secondary proces se l

eq ipment an the premises wirin s stem (se Fig re 2)

Unsp cifie e uipme t

w ith pr imar y pr oces se l

IE

Figure 2 – Examples of add-on secondary proces se ls

3.1

equipment with l mited pres ure at the electrical con ections

proces con ected eq ipment that is rated for a maximum proces pres ure of 1,5 kPa gau e

or is provided with a drain, vent or other me n s f icient to prevent pres urizin the premises

wirin con ection a ove 1,5 kPa in the event of a fai ure of the primary proces se l

3.12

premises wiring (s stem)

interior an exterior wirin , in lu in p wer, l g tin , control, an sig al circ it wirin together

with al their as ociated hardware, fitin s, an wirin devices, b th p rmanently an

temp rari y in tal ed in lu in (a) wirin from the service p int or p wer source to the outlets

or (b) wirin from an in lu in the p wer source to the outlets where there is no service

p int

Note 1 to e try: Su h wirin d es n t in lu e wirin intern l to a pla c s, lumin ires, motors, c ntrolers, motor

c ntrolc ntres, a d simiar e uipme t

a) Proces temp rature ran e ( he proces se l temp rature may b dif erent than the

publ s ed proces temp rature ran e for the eq ipment ;

b) Workin pres ure ran e;

c) Proces weted materials of con tru tion

NOT 1 It is as ume for th p rp ses of this d c me t th t instalers wi folow sta d rd e gin erin pra tic

a d a h re to in ustry sta d rds for th sele tio , instalatio , a d o eratio of e uipme t th t c ntains pro es

se ls

Un er normal o eratin con ition , flamma le proces fluid s al not b rele sed to the

atmosphere

NOT 2 It is n t a re uireme t of this te h ic l sp cific tio th t pre e tio of pro es fluid le k g to th

Dual proces se l eq ipment s al b tested in ac ordan e with 5.3

Dual proces se l eq ipment in orp ratin a purge or pres urization of the sp ce b twe n

the primary an secon ary proces se ls s al comply with the req irements of IEC 6 0 9-2

relevant to the purgin an pres urization a p ratu

The desig an man facture of se ls in orp rated into eq ipment with no an u ciation an

no ventin s al minimize the pro a i ty of common mode fai ure

NOT 1 For d al pro es se l e uipme t in orp ratin a n n iatio of a primary pro es se l faiure, lo g term

d gra atio of th primary a d se o d ry pro es se ls of d al pro es se l e uipme t is n t c nsid re

NOT 2 L c l n tio al or e d user re ulatio s c n ma d te a ditio al re uireme ts

4.4 Eq ipment with l mited pres ure at the electrical connection

Eq ipment that is rated for a maximum proces pres ure of 1,5 kPa gau e ne d not b

s bjected to the con itionin an testin req irements of this tec nical sp cification an is

con idered to me t the req irements of this tec nical sp cification

Eq ipment rated a ove 1,5 kPa an provided with a drain, vent or other me n s f icient to

prevent pres urizin the premises wirin con ection a ove 1,5 kPa in the event of a fai ure of

the primary proces se l s al b evaluated in ac ordan e with 5.4

4.5 Purged or pres urized eq ipment

Proces con ected eq ipment u in contin ou - low purged en los res or pres urized

eq ipment with infal ble containment that me ts the req irements of IEC 6 0 9-2 or simi ar

tec niq es s c that a le k of the containment can ot prod ce a flamma le mixture in the

en los re ne d not b s bject to the con itionin an testin of this tec nical sp cification,

an is con idered to me t the req irements of this tec nical sp cification

NOT This re uireme t is n t me nt to a ply to p rg d or pres urize ro ms whic are a dres e in IEC 6 0

9-13 a d IEC TR 6 0 9-16

4.6 Add-on secon ary proces se ls

Ad -on secon ary proces se ls s al b s bjected to the secon ary proces se l le k ge