A Reference number ISO 1 2944 7 1 998(E) INTERNATIONAL STANDARD ISO 1 2944 7 First edition 1 998 05 1 5 Paints and varnishes — Corrosion protection of steel structures by protective paint systems — Pa[.]
Trang 1First e itio
19 8-0 -15
Peintures et vernis — A nticor rosion des stru tur es en acier p r s stèmes
de p intur e —
Par tie 7: Exéc tion et s rv ei an e des tr avau de p inture
Trang 2© ISO 19 8
Al r i hts r es r ve Unle s oth r w is s e ifie , n p r t of this p blc tio ma b r epr od c d
or uti z d in a y for m or b a y me n , ele tr onic or me h nic l in lu in p oto o yin a d
micr ofim, with ut p r mis io in w ritin from th p bls e
Inter natio al Org niz tio for Sta d r diz tio
1 Sco e 1
2 Nor m a tive r efr enc s 1
3 Preco ditio s for the exe u tio of the pa int wor k .2
3.1 Qu a lifica tio 2
3.2 Co ditio of the su bstra te 2
3.3 Hea lth a nd sa fety a nd en ir onm enta l protectio 2
4 Coa tin m a ter ia ls 3
4.1 S p ly 3
4.2 Stor a ge .3
5 Exe utio of the pa int wor k .3
5.1 Gener a l 3
5.2 Ap lca tio co ditio s .4
5.3 Ap lca tio m ethod s .5
5.4 Eva lu a tio be or e work com m enc s .5
6 Su per visio of the pa int work .5
6.1 Gener a l 5
6.2 Mea sur em ent a nd test nstr u m ents .6
6.3 Che kin the pa int coa tin 6
7 Re er enc a r ea s 6
7.1 Gener a l 6
7.2 Pr eviou sly coa ted surfa ces .7
7.3 Re er enc a rea records 7
7.4 As es m ent of coa tin 7
An ex A Num ber of r ef renc a r ea s 8
Trang 3For word
ISO (the Inter na tio a l Orga niza tio for Sta nd a r d iza tio ) is a worldwi de fdera tio of na tio a l sta nda rds b di es (SO
m em ber b dies) The wor k of prepa r in Inter na tio a l Sta nda r d s is n rm a lly ca r r ied o t throu h ISO tech ical
com m ittees Ea ch m em ber b d y interested in a su je t for which a tech ica l com m ittee ha s be n esta blshed ha s th e
r ig t to be represented o tha t com m ittee Inter na tio a l Or ga niza tio s, g vernm enta l a nd n n g ver nm enta l, in li a iso
with ISO, a lso ta ke pa rt in the work ISO cola bora tes closely with the Interna tio a l Ele trotech ica l Com m is io (E )
o a ll m a tter s of ele trotech ica l sta nd a r d iza tio
Dr a ft Interna tio a l Sta nda rds a d opted b the tech ica l com m ittees a re circula ted to the m em ber b d ies for v tin
Pu blca tio a s a n Interna tio a l Sta nd a rd requ ir es a pprova l b a t lea st 7 % of the m em ber b dies ca stin a v te
Inter na tio a l Sta nd a r d ISO 12 4 -7 wa s prepa red b Te h ica l Com m ittee ISO/ TC 35, Pain ts an d varn ishes, S
b-com m ittee SC 14, Protective pa in t sy stems fr se l sru ctu res
ISO 12 4 co sists of the folowin pa r ts u der the gener a l ti e Pain ts an d v arn ishes – Corosion protec tion o se l
sru ctu res b protec tive pa in t sy stem s:
Part 1: Gen eral in trodu ctio
Part 2: Cla ssificatio o en v iron men ts
Part 3: D esig c on side a tion s
Part 4 : Ty pes o surfa ce a n d su rfa ce pr p ratio
Pa rt 5: Protective pa in t sy stems
Part 6: La ora tory pe frman ce tes meth ods
Part 7: Execu tio an dsu pe v ision o p in t work
Part 8 : D ev elo men t o specific a tion s fr n ew work a n d ma in ten a n ce
An ex A of this pa r t of ISO 12 4 is for inform a tio o ly
Trang 4Int rod ct ion
Un r otected steel in the a tm osp er e, in wa ter a nd in soi is su bje ted to cor rosio tha t m a y lea d to d a m a ge Therefore,
to a voi d cor rosio d a m a ge, steel structu r es a r e n r m a lly pr otected to withsta nd the cor r osio str es es d rin the servic
lf r equ ir ed of the structu r e
Ther e a r e diferent wa ys of pr otectin ste l str uctur es fr om cor rosi on ISO 12 4 dea ls with protectio b pa int system s
a nd co er s, i n the va rio s pa r ts, a ll fa tur es tha t a r e im porta nt n a chievin a deq a te corr osio protectio Ad ditio a l or
other m ea sures a re p s ible bu t requ ire pa rticu la r a greem ent betwe n the interested pa rties
In or der to ensur e e f ctive cor r osio pr ote ti on of ste l str uctur es, i is ne es a ry for owners of such str u ctures,
pla nner s, co sulta nts, com pa nies ca r r yin o t cor rosio pr ote to work, inspe tor s of protecti ve coa tin s a nd
m a nufa ctur er s of coa tin m a ter ia ls to ha ve a t their disp sa l sta te-of-he-a r t inform a ti on in co ci se for m o cor rosi on
protecti on b pa int system s S ch infor m a ti on ha s to be a s com plete a s p s ible, u na m bigu ous a nd ea siy
u nd ersta nda ble to a void d ificu lties a nd m isu der sta ndin s betwe n the pa r ties co c rned with the pra ctica l
im plem enta tio of pr otectio wor k
This Interna ti ona l Sta nda r d -ISO 12 4 - is inten ed to give this inform a ti on in the for m of a ser ies of i nstr u ctio s It s
wr itten for those wh ha ve som e tech ica l knowled e It is a lso a ssum ed tha t the u ser of ISO 12 4 is fa m ila r with
other releva nt Inter na tio a l Sta nd a rds, in pa rticu la r those dea lin with sur fa ce pr epa r a tio , a s wel a s r eleva nt na tio a l
reg la tio s
Althou gh ISO 12 4 d oes n t dea l with fina ncia l a nd co tr a ctua l q uestio s, a ttentio is d r a wn to the fa ct tha t, be a u se
of the co sider a ble im plca tio s of ina d eq a te corr osio protectio , n n-com pli a nc wi th r equ ir em ents a nd
recom m en a tio s given in this sta nd a r d m a y resu lt n seriou s fina ncia l co sequ enc s
ISO 12 4 -1 d efines the o era ll sco e of a ll pa rts of ISO 12 4 It gives som e ba sic term s a nd d efinitio s a nd a genera l
introdu ctio to the other pa r ts of ISO 12 4 F ur ther m or e, i inclu des a gener a l sta tem ent o hea lth, sa fety a nd
en ironm enta l protectio , a nd g idelnes for u sin ISO 12 4 for a given pr oje t
This pa r t of ISO 12 4 describes h w pa int wor k o steel str uctur es is to be exe u ted a nd su er vised a fter the sur fa ce
ha s be n pr epa red in a ccorda nc with ISO 12 4 -4 Exa m ples of protective pa int system s suita ble for this pu r pose a r e
given in ISO 12 4 -5
Trang 5Paints and varnishes — Corrosion protection of steel
1.1 This pa r t of ISO 12 4 dea ls with the exe u tio a nd su er visio of pa int wor k o steel str uctu r es in the
wor ksh p or o site
1.2 This pa r t of ISO 12 4 d oes n t a pply to:
– the pr epa r a tio of su r fa ces to be pa inted ( e ISO 12 4 -4) a nd the su per visio of su ch work,
– the a pplca tio of m eta llc coa tin s,
– pre-tr ea tm ent m etho s such a s p osp a tin a nd chr om a tin a nd pa int a pplca tio m etho s such a s dip in ,
p wder coa tin or coi coa tin
The folowin sta nda r d s co ta in provisio s which, throu gh r ef r enc in this tex co stitu te provisio s of this pa r t of
ISO 12 4 At the tim e of p blca tio , the ed itio s in ica ted wer e va lid Al sta nd a rds a r e su je t to revisio , a nd
pa r ties to a gr eem ents ba sed o this pa rt of ISO 12 4 a r e enco ra ged to in estiga te the p s ibi ty of a pplyin the m ost
rec nt editio s of the sta nda rds in ica ted below Mem bers of IE a nd ISO m a inta in regi sters of currently va lid
Interna tio a l Sta nd a rds
ISO 1512:19 1, Pa in ts an d va rn ish es – Samplin g o produ c ts in liq u id or pa ste frm
ISO 151 :19 2, Pa in ts an d va rn ish es – Exa min atio an d pr p ra tion o sa mples fr tesin g
ISO 2 0 :19 2, Pa in ts a n d va rn ish es – Cros -cut tes
ISO 2 0 :19 7, Pain ts an d va rn ish es – D ete m in atio o film thickn es
ISO 4 2 :19 8, Pa in ts an d va rn ish es – Pul-oftes fr a dhesion
ISO 8 0 -4:19 3, Prep ration o se l su srates befr a plication o p in ts a n d r lated produc ts – Tess fr the
a sses men t o surfa c e c lea n lin es – Part 4: Gu idan c e o the esim a tion o the pro a il y o
con den satio prior to p in t a plication
ISO 9 01:19 4, Q u ality sy stem s – Model fr q ua lity as uran c e in design , dev elo men t, production , in stalation
a n d se vicin g
ISO 9 0 :19 4, Q u ality sy stem s – Model fr q ua lity a ssu ran ce in production ,in sta lla tion a n d se vicin g
Trang 6ISO 12 4 -1:19 8, Pa in ts a n d va rn ish es – Cor osio protectio o se l sru ctu res b protective pa in t sy stems
-Pa rt 1: Gen eral in trodu ction
ISO 12 4 -4:19 8, Pa in ts a n d va rn ish es – Cor osio protectio o se l sru ctu res b protective pa in t sy stems
-Pa rt 4 : Ty pes o surfce a n d surfa ce pr p ra tion
ISO 12 4 -5:19 8, Pa in ts a n d va rn ish es – Cor osio protectio o se l sru ctu res b protective pa in t sy stems
-Pa rt 5: Protec tive pa in t sy stems
ISO 12 4 -8:19 8, Pa in ts a n d va rn ish es – Cor osio protectio o se l sru ctu res b protective pa in t sy stems
-Pa rt 8 : D ev elo men t o specific a tion s fr n ew work a n d m a in ten a n ce
3 Pr con it ions for t he exe ut ion of t he paint work
3.1.1 Com pa nies co tr a cted to a pply pr otective pa int system s to steel str uctur es, a nd their per so nel, sha ll be
ca pa ble of ca r r yin o t the wor k proper ly a nd sa fely W or k r equ ir in pa r ticula r ca re with r ega r d to its exe u tio sha ll
o ly be ca r r ied o t b per so nel ha vin q a lifica tio s which ha ve be n c r tified b a n a ppr oved b d , pr ovi ded n
other a gr eem ents ha ve be n m a de betwe n the pa rties co c rned
3.1.2 W he re the co tra ctor ha s a q a lity m a na gem ent system in o era tio , a q a lity pla n sha ll be pr epa red b the
co tr a ctor which inclu es his gener a l sta nd a rds of wor km a nship A m etho sta tem ent sha ll be provid ed for ea ch sta ge
of the work
The co tra ctor ha ll sh w tha t he wi be a ble to a chieve the spe ified q a lity level a t ea ch sta ge Evidenc for this is,
for exa m ple, given b the u se of a q ua lity a ssu r a nc system in a ccor d a nc with ISO 9 01or SO 9 0
Unles otherwise a gr eed, the co tr a ctor ha ll pr ovi de the cli ent with extr a cts of a ll exe u tio a nd su er visio sta nda r ds
given in his q ua lity m a nu a l tha t a r e r eleva nt to the spe ifica tio
3.2 Con it ion of t he su st rat e
A pr otective pa int system r eq uires proper surfa ce pr epa r a tio , which d epen s o the initia l a nd fina l co d itio of the
su rfa ce The respe tive requ ir em ents sha ll be spe ified in the pa intin spe ifica tio a nd be ca pa ble of a chievem en
Method s of surfa ce pr epa ra tio a r e d escribed in ISO 12 4 -4 The pr epa red sur fa ces sha ll be a sses ed with rega rd to
visua l clea nlnes , su rfa ce profie a nd chem ica l clea nlnes , u sin the m ethod s given in ISO 12 4 -4
The r eq uir em ents for the su er visio of these a spe ts of the wor k, the fr eq uency of a sses m en a nd the loca tio of the
a sses m ent work sha ll be a greed betwe n the pa rties co c rned
If the co d itio of the su r fa ce difers from tha t described in the spe ifica tio , the clent sha ll be inform ed
The tem pera tu r e of the surfa ce sha ll be withou t d u bt a bo e the d ew p int of the surrou ndin a ir, u nles otherwise
spe ified in the pa int m a nufa ctu r er's tech ica l d a ta she t
3.3 Healt h an saf t y an environment al prot ect ion
The a pplca ble r eg la tio s co c r nin hea lth a nd sa fety a nd en ir onm enta l pr ote ti on sha ll be com pled with Se
ISO 12 4 -1 a nd ISO 12 4 -8
Trang 74 Co t ing mat erials
The coa ti ng m a ter ia ls sha ll be su ppli ed in such a co di tio tha t they a re r ea dy for use b the a pplca tio m etho
spe ified a t the tim e of or d er in Pa int m a nu fa ctu rer s' tech ica l d a ta she ts sha ll com prise a ll deta ils which a re
ne es a ry for their use
If a ny testn i s r eq ir ed, i sha ll be spe ified, in ica tin the m etho s to be used Sa m pln a nd fur ther pr oc s in of
sa m ples sha ll be in a ccor d a nc with ISO 1512 a nd ISO 151
An deta il n t nclu ed i n the pa int m a nufa ctur er 's tech ica l da ta she t tha t cou ld a ff ct the a ppli ca ti on co d itio s or
the fina l qu a lity of the wor k sha ll be given b the m a nufa ctur er
The m a nu fa ctur er sha ll in ica te o the co ta iner the da te b whi ch the coa tin m a teria ls sh uld be u sed ( helf lf )
Unles other tem per a tures a r e in ica ted in the m a nufa ctu rer's instr u ctio s or pe ified elsewhere, coa tin m a teria ls sha ll
be stor ed a t tem pera tures a bo e +3 °C a nd u der +30 °C W a ter -b r ne coa tin m a teria ls, in pa r ti cu la r , m a y be om e
u nu sa ble a fter free in
Coa tin m a ter ia ls a nd a ny other m a teria ls u sed ( olvents, thin ers etc.) sha ll be stored in a se ured a r ea
Pa int co ta iners sha ll be kept sea led u til the co tents a re pr epa red for use Pa rtly used co ta iners m a y be re-sea led a nd
u sed la ter, if n t otherwise in ica ted i n the pa int m a nufa cturer's tech ica l da ta she t Pa r tly u sed co ta iner s sha ll be
clea rly m a rked
5 Exe ut ion of t he paint work
The surfa ces to be tr ea ted sha ll be sa fely a cc s ible a nd wel i um ina ted
W hen usin the coa tin m a ter ia ls, the m a nu fa cturer's tech ica l da ta she t sha ll be o served u nles spe ifica lly sta ted
otherwise in the pa intin spe ifica tio
Pr ior to a nd d urin the a pplca tio , the coa tin m a teria ls sha ll be verified to ensu r e:
- co for m ity of the co ta iner la bel with the spe ified pr odu ct d escriptio ;
- n skin form a tio ;
- n irr ever sible settlin ;
- u sa bi ty u der the given site co ditio s
An sed im ent pr esent sha ll be ea siy r edispersible
An viscosity a d justm ent – which m a y be ne es a r y du e to low a pplca tio tem per a tu r es or d ifer ent a ppli ca ti on
m etho s – sha ll be m a de in a ccorda nc with the pa int m a nufa ctu r er 's instr u ctio s The clent sha ll be inform ed , if
req uir ed in the spe ifica tio , of a ny such a d ju stm en
The a pplca tio m etho s wi d epen o the type of coa tin m a ter ia l, the sur fa ce, the type a nd siz of the structu r e a nd
the loca l co di tio s R eg la tio s a nd r eq irem ents with r ega r d to en ironm enta l pr otectio m a y a ff ct the ch ic of the
a pplca tio m ethod Unles otherwise spe ified, the a pplca tio m etho sha ll be a gr eed
The prim in coa t sha ll co er the entire surfa ce profie of the steel su rfa ce Ea ch coa t sha ll be a ppled a s u iform ly a s
Trang 8Meth ds for the m ea su r em ent of fim thicknes a r e d escribed in ISO 2 0 The pr oc du r e for che kin n m i na l dry
fim thicknes es (instr u m ents, ca libr a tio , a nd a ny a llowa nc to be m a de for the co tr ibu tio of the surfa ce rou gh es
to the resu lt) sha ll be a gr eed betwe n the interested pa rties
Unles a greed other wise, in ivi dua l dry fim thicknes es of les tha n 8 % of the n m i na l dry fim thicknes a r e n t
a cc pta ble Unles a greed otherwise, in ividu a l va lues betwe n 8 % a nd 10 % of the n m ina l dry fim thicknes a re
a cc pta ble pr ovided tha t the o era ll a vera ge (m ea n) is equ a l to or grea ter tha n the n m ina l dry fim thicknes
Ca r e sha ll be ta ken to a chieve the n m i na l dr y fim thicknes a nd to a void a rea s of exc s ive thicknes It i s
recom m en ed tha t the m a xim um dry fim thicknes is n t grea ter tha n 3tim es the n m ina l fim thicknes In the ca se of
exc s ive m a xi m um dry fim thicknes , ex er t a gr eem ent sha ll be fo n betwe n the pa r ties F or pr od ucts or system s
whi ch ha ve a cr itica l m a xim um dry fim thicknes a nd in spe ia l ca ses, inform a tio gi ven in the m a nufa cturer 's
tech ica l d a ta she t sha ll be o served
Al surfa ces tha t a re d ificu lt to a cc s a nd, for exa m ple, ed ges, corner s, weld s a nd riveted a nd b lted co ne tio s, sha ll
be pa inted with pa rticula r ca re
If a d ditio a l ed e protectio i s r eq uir ed, a stripe coa t extend in a cros a rea so a ble width (a ppr oxim a tely 2 m m ) o
b th sides of the ed e sha ll be a ppled
To a ssist in a chievin the req ired dr y fim thicknes , the wet fim thicknes sha ll be perio ica lly che ked d r in
a pplca tio
The tim e interva l betwe n the a pplca tio of coa ts, a nd betwe n a pplca tio of the fina l coa t a nd u se, given in the
m a nufa ctu r er's tech ica l da ta she t for the coa tin m a teria l, or a s other wise requ ired b the spe ifica tio , sha ll be
a d hered to
De e ts in a ny pa int coa t which m a y lea d to a r ed uctio in the protectio pr ovided b the coa t, or which ha ve a
sig ifica nt ef ct o the a ppea r a nc , sha ll be repa ir ed prior to a pplca tio of the next coa t To a void d a m a ge, the coa tin
sha ll be su fficiently ha rd beore tra nsp rtin a nd ha nd lin
Area s which a re n t to be pa inted or a re to be pa inted with a low fim thicknes o ly, for exa m ple su r fa ces which wi
su bseq uently be welded a nd fa yin surfa ces (those for which a close-toler a nc fi is ne es a ry) sha ll be identified to the
co tr a ctor be ore pa intin com m enc s
In order to ensur e the pr otectio r eq ired fr om the coa tin , the a m bient co d itio s o site sha ll be che ked to ensur e
tha t they m eet the requ ir em ents given in the pa int m a nu fa cturer 's tech ica l da ta she t for the pa rticu la r coa tin m a teria l
This sha ll a lso a pply to dryin a nd rea ctio tim es
Durin the pla nnin sta ge beor e sta r ti ng the work, m ea sur es sha ll be de ined b which a dver se ef cts o the
en ir onm ent ca n be a voided or r ed uc d to a m inim um
Durin the exe utio of the cor rosio protectio wor k, ca r e sha ll be ta ken tha t the work is n t a ff cted b a ny ou tsid e
influenc s tha t co ld lea d to a red ctio in the q a lity of the coa tin Pa int work sha ll ta ke pla ce in a n a rea sepa r a ted or
pr otected fr om the work of other tr a d es (bla st-clea nin , weldin etc.) If a dverse wea ther co di tio s oc ur du r in
a pplca tio , the wor k sha ll be stop ed a nd the fr eshly coa ted a rea protected a s fa r a s pra ctica l
The lowest a nd hig est perm is ible tem per a ture of the sur fa ce to be coa ted a nd of the surrou nd in a ir sha ll be a s sta ted
in the m a nu fa cturer 's tech ica l d a ta she t
Coa tin m a ter ia ls sha ll n t be a ppled a t tem pera tu r es below 3 °C a bo e the d ew p in determ ined in a ccord a nc with
ISO 8 0 -4 W et surfa ces sha ll o ly be pa inted with those coa tin m a teria ls which a re perm itted in the tech ica l da ta
she t or a ppr oved b the pa int m a nu fa ctu rer
Trang 95.3 Ap lcat ion met hods
5.3.1 Brush ap lcat ion
Br u shes sha ll be sui ta ble for thei r inten ed use This a ppli es pa rticula rly to cor ner s, rivet hea d s, b l hea ds, a nd a ngles
a nd a r ea s which a r e dificul to a cc s Deta ils sha ll be given in the spe ifica tio
The coa tin m a teria ls u sed sha ll be suita ble for this m etho of a pplca tio a nd sha ll ha ve g o level n pr operties The
type a nd si ze of the roler ha ll be a ppr opr ia te to the pa r ticula r jo R oler a pplca tio is n rm a lly n t recom m en ed for
the a pplca tio of a nticorr osive prim ers
The folowin spr a yin m ethod s a re a m on those com m only u sed:
– co ventio a l, low-pres u r e a ir pra y;
– a irles spra y;
– a ir-a ssisted a irles spr a y;
– ele trosta tic spra y
The pa int viscosity, spra yin pr es u re, type of n z le, tem pera tu re of pa int m a teria l, d ista nc to the su r fa ce to be coa ted
a nd spra yin a ngle sha ll be sele ted so tha t u iform a nd co tinu ous coa tin s a re pr od uc d
W hen usin these m etho s, suita ble pr eca u tio s sha ll be ta ken to a void spr a y m ist spr ea din o er the su rr ou nd in s
If the requ ir ed fim thi cknes ca nn t be a chieved o ed es, in corners or in a r ea s of the structur e which a re dificu lt to
a cc s ( pra y sha dows), these a rea s sha ll be pr ecoa ted, b brushin , usin a stripe coa t, or pr a yin
F or coa tin m a ter ia ls ha vin a tend ency to settle, the pa int co ta iner ha ll be fitted with a m echa nica l stirrer
5.3.4 Ot he ap lcat ion met hods
If other m etho s a r e used, for exa m ple flow-coa tin , a ppli ca ti on of h t-m el coa tin m a teria ls or a pplca tio of
a nticorrosive ta pes, they sha ll be ca r ried ou t in a ccor d a nc with the m a nu fa cturer 's instru ctio s
The a pplca tio m etho spe ified sha ll be eva lua ted u sin the spe ified m a ter i a ls to ensur e tha t they give the r eq uir ed
pr otectio If the a pplca tio m etho a nd/or the spe ified m a ter ia ls a r e fo n to be u sui ta ble, the spe ifica tio sha ll be
a m end ed a ccordin ly b the pa rties in olved a nd a ny co seq uenc s, e.g cost, tim e, sha ll be ta ken into co sid era tio
6 S pe vision of t he paint work
The exe uto of the work sha ll be su er vised a t a ll sta ges Su pervisio sha ll be u der ta ken b suita ble q ua lified a nd
ex erienc d peo le The co tr a ctor sha ll be r esp nsible for ca rr yin o t this su ervisio him self, bu t a dd itio a l
su ervisio b the clent – even for cor rosio protectio work in the worksh p – is a dvisa ble
W hen coa tin m a teria ls with which the co tr a ctor is u fa m ila r a re to be a ppled, the m a nufa ctur er of the coa tin
m a teria l sha ll be co sulted
The level of su er visio wi depen o the type a nd im por ta nc of the pr oje t, the degr ee of di fficulty of the wor k a nd
loca l co ditio s, a nd o the type of coa tin a nd its inten ed ser vic lf This su ervisio wi req ire a ppropr ia te
Trang 106.2 Measur ment an t es inst rument s
The instr um ent m a nu fa ctur er 's instructi ons for the u se of their eq i pm ent sha ll be com pled with The instr um ents used
sha ll be che ked, ca libra ted a nd m a inta ined a t r eg la r inter va ls a nd the r esults sha ll be r ecord ed
6.3 Che king t he paint co t ing
Coa tin s sha ll be che ked for com pla nc with the spe ifica tio , for exa m ple:
– b visua l a sses m ent, e.g for u i form ity, colo r , hi din p wer a nd d ef cts such a s h lda ys, wr i nklin ,
cra terin , a ir bu bbles, fla kin , cr a cks a nd cu r ta ins;
– b m ea ns of instr u m ents for com pla nc with the folowin cha r a cteristics of the d r y fim , if req uired:
– d r y fim thicknes : genera lly b n n-d estructive m ethod s (e ISO 2 0 )
[se a lso a ) below];
– a dhesio : b d estructive m ethod s ( e ISO 2 0 or SO 4 2 );
– p rosity: b flow or hig -v lta ge d etector s
For dry fim thicknes m ea surem ents, the pa r ties co c rned sha ll a gree o the folowin :
a ) The m etho to be used , the m ea surem ent nstr u m ent to be used, deta ils of the ca libr a tio of the m ea surem ent
instrum en a nd h w to ta ke into a cco nt the co trib tio of the su r fa ce profie to the r esu lt
b) The sa m pln pla n – h w a nd h w m a ny m ea su r em ents a r e to be m a d e for ea ch type of su r fa ce
c) How the results a r e to be r ep r ted a nd h w they a r e to be com pa r ed with a cc pta nc criter ia
Dry fim thicknes es (inclu i ng the n m ina l a nd m a xim um thicknes es) sha ll be che ked a t ea ch critica l sta ge, a nd
when the com plete system ha s be n a ppled A critica l sta ge is, for exa m ple, when there is a cha nge in the resp nsibi ty
for the pa int work or when a lo g tim e ela pses betwe n a pplca tio of prim in coa ts a nd su sequ ent coa ts
The coa tin o co ta ct sur fa ces of pr eloa d ed b lted co ne tio s, for exa m ple hig -stren th fitted b lts in fr ictio -grip
co ne tio s a nd hig -str en th b lts in shea r-type bea r in co ne tio s sha ll be che ked for co for m ity with the
a gr eem ents m a d e in the co tr a ct
If d estr u ctive testin is ne es a ry, n tch-cu tter m ea surem ents a re a cc pta ble Su ch instrum ents ca n be used to che k the
thicknes of ind ividu a l coa ts a nd tha t of the com plete system , a nd the seq enc of the coa ts ca n a lso be che ked W hen
testin for p r es, the instr u m ent a nd test v lta ge used sha ll be a greed betwe n the pa rties co c r ned An coa tin
da m a ge sha ll be repa ir ed in a ccorda nc with the spe ifica tio Se ISO 12 4 -8
R efr enc a rea s a r e su ita ble a r ea s o the str u cture u sed to esta blsh a m inim u m a cc pta ble sta nda r d for the wor k, to
che k tha t da ta provided b a m a nufa ctu r er or co tr a ctor is corr ect a nd to ena ble the perfor m a nc of the coa tin to be
a sses ed a t a ny ti m e a fter com pleti on R ef r enc a r ea s a r e n r m a lly n t used for g a r a ntee pu r poses b t m a y be u sed
for this pu r pose if a greed betwe n the co tra ctin pa rties
If r ef r enc a r ea s a re req uired, they sha ll be prepa red in loca tio s in which the cor rosive str es es a r e typica l for the
str u cture co c r ned Al su r fa ce prepa ra tio a nd pa int a pplca tio wor k o r ef r enc a rea s sha ll be ca rr ied ou t in the
presenc ofr epresenta tives of a ll pa rties co c rned, wh sha ll give their a greem ent n writin when the r efrenc a r ea s