Transcript
PAINT TECHNICAL TRAINING
CORROSION CELL
CURRENT-CARRYING ELECTROLYTE (SEAWATER, SOIL, ETC.)
ANODE (CORRODING AREA)
CATHODE (NONCORRODING AREA)
CORROSION CELL
CURRENT-CARRYING ELECTROLYTE (SEAWATER, SOIL, ETC.)
ANODE (CORRODING AREA)
CATHODE (NONCORRODING AREA)
IONIC PATH schematic of a corrosion cell
CATHODE
ELECTRON
ANODE
REACTION
PATH
REACTION
Corrosion cell will stop if an reaction or pat! is stoppe"
NE# PIPE
OLD PIPE
ANODE
CATHODE -OTHER CELLS
TAN$ DRAINAGE
POOR
POOR
GOOD
PAINT %EHA&IOUR O&ER SUR'ACE IRREGULARITIES IRREGULARITY
SHARP CORNERS * EDGES
INSIDE CORNERS
PRO%LE(
INSU''ICIENT THIC$NESS
CRAC$ED OR SPONGY COATING
CORRECTION
GRIND TO +, IN. (INI(U( RADIUS
'ILLET #ELD * GRIND TO +,/ IN. (INI(U( RADIUS
INSU''ICIENT THIC$NESS CRAC$ED OR SPONGY
GRIND 'LUSH
PRO)ECTIONS 'ILL #ITH #ELD (ETAL * GRIND 'LUSH
PITS
CRE&ICES
ENTRAPPED AIR
GAL&ANIC SYSTE( O' CATHODIC PROTECTION
(ETAL RECEI&ING PROTECTION
CURRENT-CARRYING ELECTROLYTE
GALANIC ANODES
I(PRESSED CURRENT SYSTE( O' CATHODIC PROTECTION
0-1
(ETAL RECEI&ING PROTECTION
CURRENT-CARRYING ELECTROLYTE
RE(OTE ANODE GROUND %ED
021
RECTI'IER
PAINT IS A %ARRIER 'RO( S3n O45en Salt #ater
PINPOINT RUSTING
RUSTING #ILL OCCUR HERE
STEEL
COATING
STEEL
INHI%ITION %Y 6INC PRI(ER
INHI%ITI&E COATING CONCEPT
%rea7 in coatin5 to steel s3rface
(oist3re a:sor:tion into fil; (moist!re "re#io!s coatin$)
(oist3re allows 8inc to ioni8e
Ioni8ation of in!i:itor
Cat!o"icall protectin5 steel
Reaction wit! steel s3rface
Ti5!t a"!esion pre9ents coatin5 3n"erc3t
6N 22
Passi9e laer
/n" or5anic topcoat
/n" coat
+st or5anic topcoat
+st coat
Inor5anic 8inc per;anent pri;er
STEEL
In!i:iti9e pri;er
STEEL
THREE CO(PONENTS O' PAINT
SOL&ENT RESIN PIG(ENT
SOL&ENT
&EHICLE
RESIN
'IL( SOLIDS
PIG(ENT
'UNCTION O' PIG(ENT Pro9i"e opacit Pro9i"e colo3r I;pro9e weat!er resistance Increase paint a"!esion Decrease ;oist3re per;ea:ilit Control 5loss
#ET PAINT
&EHICLE
SOL&ENT
PIG(ENT
RESIN
PRI(ARY
SECONDARY
PIG(ENT
PIG(ENT
RELATIONSHIP O' PAINT RESIN,PIG(ENT RATIO TO GLOSS HIGH-GLOSS
SE(I-GLOSS
'LAT
SOL&ENT<
SOL&ENT<
SOL&ENT<
RESIN
RESIN
PIG(ENT
PIG(ENT
RESIN PIG(ENT
HIGH RESIN, PIG(ENT
RESIN PIG(ENT
(ODERATE RESIN, PIG(ENT
< A;o3nt of sol9ent ;a 9ar 5reatl
#ET PAINT
RESIN PIG(ENT
RESIN PIG(ENT
LO# RESIN, PIG(ENT
CURED PAINT
CROSSSECTION O' CURED PAINT
A PAINT 'IL( (UST %E=
Eas to appl E T A R T S % U S
Contin3o3s an" 3nifor; Ti5!tl a"!erin5 I;per;ea:le #eat!er resistant
THREE (ETHODS O' PAINT CURING Air o4i"ation Sol9ent or water e9aporation C!e;ical reaction of co;ponents
AIR O>IDATION O' PAINTS
LI?UID DRYING OIL
O>YGEN
SOLID 'IL( O' DRYING OIL
PROPERTIES O' AIR DRYING COATINGS Generic (chemical) t%"e
&ro"erties
Oleoresino3s
Goo" wettin5@ 5enerall soft an" slow "rin5 cannot :e 3se" in i;;erse" 8one
Al7"
Goo" wettin5@ ;a :e !ar" or soft@ cannot :e 3se" in i;;erse" 8one
Silicone al7"
I;pro9e" "3ra:ilit an" 5loss@ cannot :e 3se" in i;;erse" 8one
P!enolic
Can :e 3se" in i;;ersion ser9ice
CURING O' LAC?UERS AND #ATER E(ULSIONS
SOL&ENT 'U(ES OR #ATER &APOR
SOLID RESIN IN SOL&ENT OR #ATER
N O I T A R O P A & E
SOLID RESIN UNCHANGED CHE(ICALLY
PROPERTIES O' COATINGS THAT CURE %Y SOL&ENT OR #ATER E&APORATION
Generic (chemical) tpe
Properties
SOL&ENT %ASED COATINGS &inl 0pol9inl c!lori"e1
Goo" water li;ite" sol9ent resistance@ easil to3c!e"-3p or topcoate"
C!lorinate" r3::er
Goo" water li;ite" sol9ent resistance@ "3ra:le easil to3c!e"-3p or topcoate"
Coal tar an" asp!altic
Soft@ :lac7@ of li;ite" 3se freB3entl on ;ec!anicall cleane" s3rfaces
Pol9inl :3tral
Use" e4cl3si9el in pretreat;ent ('ash) pri;ers for "rin5 oil an" 9inl coatin5s
#ATER %ASED COATINGS Acrlic
Use" in at;osp!eric area onl@ poor wettin5
Pol9inl acetate
Sa;e as acrlic
CURING O' PAINTS %Y CHE(ICAL REACTION
LI?UID
LI?UID
LI?UID
RESIN A
RESIN %
RESIN A-%
PROPERTIES O' CHE(ICAL REACTING COATINGS General (chemical) t%"e
&ro"erties
Epo4
Goo" water an" c!e;ical resistance@ c!al7 freel@ "iffic3lt to topcoat
Coal tar epo4
E4cellent water resistance@ :lac7 onl@ "iffic3lt to topcoat
Uret!ane
Goo" water an" sol9ent resistance alip!atic 3ret!anes weat!er well in s3nli5!t@ "iffic3lt to topcoat
Polester
'reB3entl 3se" wit! 5lass fi:res to 5i9e to35! water resistant coatin5 or 5lass fla7es to i;part a:rasion resistance
Inor5anic 8inc
Goo" a:rasion resistance@ 3se" in pre-constr3ction pri;ers@ topcoate" for 3se in i;;erse" 8one
COATING PROPERTIES RELATED TO CHE(ISTRY
(ec!anis; an" ti;e of c3rin5 Perfor;ance in "ifferent en9iron;ents Perfor;ance on "ifferent s3:strates Co;pati:ilit wit! ot!er coatin5s Ease of top coatin5 an" repair 'le4i:ilit an" to35!ness Application properties ('ettin$, !il, "ot life etc.)
THE TOTAL ?UALITY O' A COATING SYSTE( IS ONLY 'OR DEPENDING ON THE PAINT ITSEL'.
F O' PAINT 'AILURES ARE CAUSED %Y I(PROPER SUR'ACE PREPARATION.
SUR'ACE PREPARATION RE?UIRE(ENTS Proper constr3ction Proper "e5ree of cleanliness Proper profile !ei5!t (te*t!re)
REPA REP AIRS,(ODI'IC IRS,(ODI'ICA ATIONS RE?UIRED %E'ORE SUR'ACE SUR'A CE CLEANING Steel
wel"in5 c3ttin5 5rin"in5 of wel"s an" e"5es fillin5 cre9ices
#oo"
replace;ent c3ttin5 nailin5
Concrete,(asonr
patc!in5 fillin5 crac7s an" pores
Plastic
c3ttin5 :on"in5
RULE O' THU(% T!e profile !ei5!t of steel s!o3l" :e :etween +,/ an" / +,/ ;ills an" ne9er ;ore t!an one-!alf t!e pri;er "r fil; t!ic7ness
R8 PRO'ILE &ALUE
6+
6/
6
6
6
CO((ON (ETHODS O' CLEANING SUR'ACES 'OR PAINTING Han" an" power tools 'la;e Sol9ent Stea; #ater :last A:rasi9e :last
'LA(E CLEANING ' loosens ;ill scale ol" paint 'ollow wit! wire :r3s!in5 or scrapin5 #ar;s an" "ries s3rface Slow= + - linear feet per ;in3te #ear 5o55les 5lo9es !el;et Re;o9e all so3rces of fla;;a:le 5ases
SOL&ENT #ASHING Re;o9es oil 5rease "3st Use clean ra5s T3rn an" replace often Replace sol9ent for final rinse #ear 5o55les an" 5lo9es
%LASTING HAS LI(ITATIONS Re;o9al oil,5rease Re;o9al t!er;oplastic ;aterials D3st pro:le;s C!e;ical waste
CLEANING (ETHOD
CONTA(INANT
Sol9ent cleanin5 Stea;
Grease , Salt , Dirt Oil , #el";ar7s
#ater:lastin5
(arine 5rowt! , Loose paint
Han" or power tools
Loose ;ill scale , #el" fl34 , Loose r3st , #el" splatter , Loose paint
'la;e cleanin5 followe" : wire:r3s!in5
R3st Loose ;ill scale , so;e ti5!t ;illscale
A:rasi9e :lastin5
All 9isi:le r3st , Ti5!t paint Ti5!t ;ill scale , 'orei5n ;atter
RECO((ENDED CLEANING (ETHODS 'OR &ARIOUS SU%STRATES < #oo"
san"in5 after scrapin5 loose paint
Plastic
san"in5 after scrapin5 loose paint
Concrete,(asonr
caref3l water:lastin5
Steel
a:rasi9e :lastin5 5enerall preferre" o9er ;ec!anical cleanin5
Al3;ini3;,Tin,Copper,%rass,Gal9ani8e" steel ;ec!anical cleanin5 or :r3s! off :last@ pretreat;ent ('ash) pri;e
+ Sol#ent 'ash to remo#e oil or $rease
CRITERIA 'OR COATING SELECTION Desire" coatin5 properties Nat3re an" con"ition of s3:strate %asic f3nction of coatin5 Li;itations of ti;e space eB3ip;ent etc Si5nificant en9iron;ental factors
STEEL PAINTING COSTS SUR'ACE PREPARATION PAINT APPLICATION
PAINT (ATERIAL -
-
+ - +
COATINGS CO((ONLY USED ON #OOD
S3:strate
Paint
Co;;ents
Interior woo"
Oil
Slow "rin5 an" relati9el soft
Al7"
(a :e !ar" or soft
Late4 (#in%l or acr%lic)
Can :e applie" o9er oil al7" or late4 pri;er
Oil
Goo" wettin5@ slow "rin5@ soft
Al7"
Goo" wettin5@ ot!er properties ;a
E4terior woo"
9ar Silicone Al7"
Goo" wettin5 an" 5loss
Late4
Poor wettin5@ easil applie" an" cleane" 3p
(#in%l or acr%lic)
COATINGS CO((ONLY USED ON (ASONRY AND CONCRETE SUR'ACES Interior ;asonr plaster an" wall :oar"
Acrlic late4
Easil applie"@ ;3st re;o9e all loose c!al7 &inl late4 Sa;e as acrlic late4 C!lorinate" r3::er Goo" for waterproofin5
E4terior concrete an" ;asonr
Acrlic late4
'ill coats will re"3ce water penetration
&inl late4 Sa;e as acrlic late4 C!lorinate" r3::er Goo" for waterproofin5 for &inl Epo4 concrete in corrosi9e con"itions
COATINGS CO((ONLY USED ON IRON AND STEEL SUR'ACES S3:strate Interior iron an" steel
Paint Al7" &inl
Co;;ents Not for i;;erse" s3rfaces Goo" water poor sol9ent resistance
Epo4
Goo" "3ra:ilit an" c!e;ical resistance Goo" "3ra:ilit an" c!e;ical resistance
Uret!ane E4terior iron an" steel
Al7" Silicone Al7"
'or ;il" an" ;arine en9iron;ents Sa;e as Al7" :etter 5loss retention
Inor5anic 8inc
Topcoate" wit! epo4 for seawater i;;ersion tan7coatin5s
&inl Epo4 Uret!ane
Goo" "3ra:ilit easil to3c!e" 3p Goo" "3ra:ilit c!al7s in s3nli5!t Alip!atic tpe !as 5oo" weat!erin5
AL$YD A"9anta5es One-pac7a5e coatin5
Disa"9anta5es
Goo" e4terior "3ra:ilit
Poor c!e;ical an" sol9ent resistance
(o"erate cost
Poor water resistance
Goo" fle4i:ilit
Poor resistance to al7alinit
E4cellent a"!esion to ;ost s3rfaces incl3"in5 poorl prepare" s3rfaces Eas to appl Goo" 5loss retention
LATE> (Acr%lic or in%l) A"9anta5es
Disa"9anta5es
(o"erate cost
Li;ite" "3ra:ilit o3tsi"e
Goo" fle4i:ilit Eas to appl topcoat repair
Poor c!e;ical an" sol9ent resistance
En9iron;ental accepta:ilit
Poor i;;ersion resistance C3rin5 te;perat3res ;3st :e a:o9e '
%ITU(INOUS A"9anta5es
Disa"9anta5es
Low cost
Poor weat!erin5 properties
Goo" ;oist3re :arrier
%lac7 color onl
Goo" corrosion protection
Poor sol9ent resistance
Goo" fil; :3il"
&INYL (Acr%lic) A"9anta5es
Disa"9anta5es
Rapi" "rin5 an" recoatin5
Poor sol9ent resistance
E4cellent "3ra:ilit
Low fil; :3il" per coat
E4cellent "3ra:ilit &er 5oo" 5loss retention Applica:le at low te;perat3res
CHLORINATED RU%%ER A"9anta5es
Disa"9anta5es
Rapi" "rin5 an" recoatin5
Poor sol9ent resistance
'air c!e;ical resistance
Poor !eat resistance (-/ 0) Poor 5loss retention
Goo" water resistance Goo" "3ra:ilit Applica:le at low te;perat3res Eas to repair
EPO>Y A"9anta5es E4cellent c!e;ical an" sol9ent resistance Goo" water resistance &er 5oo" e4terior "3ra:ilit Har" slic7 fil; E4cellent a"!esion E4cellent a:rasion resistance Goo" ca3stic resistance
Disa"9anta5es Two-pac7a5e coatin5 - li;ite" potlife C3rin5 te;perat3res ;3st :e a:o9e ' Poor 5loss retention 'il; c!al7s on a5ein5 Ro35!enin5 3p reB3ire" for repair
COAL TAR EPO>Y
A"9anta5es E4cellent resistance to fres! an" salt water Goo" fil; :3il" E4cellent resistance to alip!atic petrole3; pro"3cts
Disa"9anta5es C!al7in5 Topcoatin5 ;a present pro:le;s (tar leein$)
POLYURETHANE
A"9anta5es E4cellent 5loss retention Can :e applie" at low te;perat3res E4cellent "3ra:ilit in e4terior e4pos3re Recoata:le
Disa"9anta5es Gloss "rop wit! !i5! !3;i"it "3rin5 "rin5 Two co;ponent - li;ite" pot life Hi5! cost Personal protection reB3ire"
ORGANIC 6INC
A"9anta5es E4cellent corrosion protection Pro9i"es 5al9anic protection Easier to topcoat t!an inor5anic 8inc (less "oro!s) One or two-pac7a5e "epen"in5 3pon or5anic resin
Disa"9anta5es Hi5! cost Spra application onl Constant stirrin5 necessar "3rin5 application Not s3ita:le for aci"ic or ca3stic ser9ice 6inc salts to :e re;o9e"
INORGANIC 6INC
A"9anta5es E4cellent corrosion protection E4cellent e4terior "3ra:ilit E4cellent !eat resistance Pro9i"es 5al9anic protection properties Pro9i"es per;anent pri;er capa:ilit w!en 3se" in conJ3nction wit! proper topcoats an",or ;aintenace practices E4cellent sol9ent resistance
Disa"9anta5es Hi5! cost Spra application onl@ s7ille" applicators reB3ire" Not s3ita:le for aci"ic or ca3stic ser9ice ReB3ires caref3l selection of tiecoats an" topcoats Drin5 infl3ence" : !3;i"it - "epen"in5 on tpe Constant stirrin5 necessar
'ACTORS A''ECTING SELECTION O' (ETHOD O' COATING APPLICATION C!aracteristic
%r3s!
Roller
Spra
Spee" Ease of application Si;plicit of eB3ip;ent Safet (aterial conser9ation Porta:ilit &ersatilit Initial econo;ics Lon5 ran5e econo;ics Hi"in5 power Unifor;it
fair fair e4cellent e4cellent e4cellent e4cellent 5oo" e4cellent fair 5oo" poor
5oo" 5oo" e4cellent e4cellent 5oo" 5oo" fair e4cellent fair fair fair
e4cellent poor poor poor poor,5oo"< poor e4cellent poor e4cellent poor,5oo"< 5oo"
+ #aries 'ith e1!i"ment an o"erator
(ETHOD (s1!are feet a""lie "er ho!r a%) %r3s!
+.
sB. ft.
Roller
/ -
.
sB. ft.
Air Spra
-
K.
sB. ft.
Airless Spra
K - +/.
sB. ft.
THREE 'ACTORS A''ECT PAINT &ISCOSITY Sol9ent , soli"s ratio Paint te;perat3re Paint ;i4in5
TE(PERATURE &S. &ISCOSITY K
1 S D N O C E S 0 Y T I S O C S I & /
F
TE(PERATURE 0 '1
+/
(I>ING AND THINNING PROCEDURE One-pac7a5e paints Two-pac7a5e paints
= tpe an" a;o3nt of t!inner to :e 3se" if an = ratio of catalst to :ase paint in"3ction ti;e an" pot life
PROPER O&ERLAPPING TECHNI?UE
O9erlap stro7es : for 3nifor; fil; :3il"
PROPER STRO$ING TECHNI?UE....... SECTIONING A LARGE SUR'ACE +K - M
o9erlap
+K - M
+K - M
o9erlap
Di9i"e a lon5 s3rface area into sections +K - M wi"e
PAINT INSPECTION DUTIES Inspection of ;aterials Inspection of s3rface preparation Inspection of paint application 'inal inspection for acceptance
PROPER STORAGE O' PAINT NO
2ES
'la;es
Te;perat3re control
Spar7s Direct s3n
Stoc7 rotation On pallets &entilation
Oil or 5rease conta;ination
Poor a"!esion creates areas w!ere ;oist3re 9apo3r can con"ense or t!e 9apo3r press3re in t!e 9oi" ;a :e 5reater t!an e4terior water press3re ca3sin5 :listers an" e9ent3al coatin5 "isr3ption
STEEL
%U%%LE O' TROU%LE &AINT 3LISTER 0OR4ED 32 SOLENT ENTRA&&ED 3ETWEEN COATS
&APOR 'RO( SOL&ENT TRYING TO ESCAPE
PRI(ER COAT
TOP COAT
STEEL #ALL
SECOND COAT
SUR'ACE PREPARATION SPECI'ICATIONS SSPC-G3i"e to &is +
Pictorial s3rface preparation Stan"ar"s for paintin5 steel s3rfaces
SSPC-G3i"e to &is /
Stan"ar" ;et!o" of e9al3atin5 "e5ree of r3stin5 on painte" steel s3rfaces
SSPC-SP
+
Sol9ent cleanin5
SSPC-SP
/
Han" tool cleanin5
SSPC-SP
Power tool cleanin5
SSPC-SP
#!ite ;etal :last cleanin5
SSPC-SP
M
Co;;ercial :last cleanin5
SSPC-SP
F
%r3s!-off :last cleanin5
SSPC-SP
K
Pic7lin5
SSPC-SP
+
Near-w!ite :last cleanin5
APPEARANCE O' THE CO(PLETED SUR'ACE T!e s3rface s!all :e ro35!ene" to a "e5ree s3ita:le for t!e specifie" paint sste; T!e co;plete" s3rface s!all :e cleane" to a 5re-w!ite ;etallic colo3r. T!e appearance of t!e s3rface ;a :e affecte" : t!e partic3lar :lastin5 a:rasi9e 3se" Unifor;it of colo3r ;a :e affecte" : t!e 5ra"e ori5inal s3rface con"ition an" confi53ration of t!e ;aterial :ein5 cleane" as well as : "iscolo3rations fro; ;ill or fa:rication ;ar7s an" t!e s!a"owin5 fro; :last cleanin5 patterns SSPC-&is + or ot!er 9is3al stan"ar"s of s3rface preparation a5ree" 3pon : t!e contractin5 parties ;a :e 3se" to f3rt!er "efine t!e s3rface
SUR'ACE PREPARATION SPECI'ICATIONS 'OR A%RASI&E %LAST CLEANED STEEL S3rface
&is3al stan"ar" SSPC-&is +
NACE Spec.
SSPC-SIS SSPC-spec.
Description
#!ite ;etal
+
SSPC-SP
CSa
Gre-w!ite colo3r + free of oil 5rease "irt r3st ;ill scale an" paint
Near w!ite
/
SSPC-SP +
CSa/
Onl 9er li5!t s!a"ows strea7s or "iscolo3ration. (At least 5-6 free)
Co;;ercial
SSPC-SP M
CSa/
At least two-t!ir"s free of 9isi:le resi"3es
%r3s!-off
SSPC-SP F
CSa+
Onl ti5!t ;ill scale an" ti5!tl a"!erin5 r3st after :lastin5
'OUR RUST GRADES O' UNPAINTED STEEL A"!erent ;ill scale R3stin5 ;ill scale R3ste" Pitte" an" r3ste"
HAND TOOL PO#ER TOOL CO((ERCIAL %LAST NEAR #HITE %LAST #HITE %LAST
.+
./
.
.
.
.M
.F
.K
.
+.
+.+
TOTAL COST IN DOLLARS PER S?UARE 'OOT
OTHER STEEL STRUCTURES PAINTING COUNCIL SUR'ACE PREPARATION SPECI'ICATIONS SSPC specification
Spec.no.
Inten"e" 3se
Sol9ent cleanin5
SSPC-SP+
Re;o9al of oil 5rease an" ot!er sol3:le ;aterials prior to re;o9al of ;ill scale r3st an" coatin5 : ot!er ;et!o"s
Han" tool cleanin5
SSPC-SP/
Re;o9al of loose ;ill scale r3st an" coatin5 : !an" san"in5 scrapin5 c!ippin5 or ot!er i;pact tools
'la;e cleanin5 of new steel
SSPC-SP
Preparin5 3npainte" steel wit! o4-acetlene fla;e followe" : wire :r3s! re;o9al of loosene" ;ill scale an" r3st
Pic7lin5
SSPC-SPK
Preparin5 ;etal s3rfaces for coatin5 : re;o9al of ;ill scale an" r3st : c!e;ical reaction electrolsis or :ot!
STEEL SUR'ACE PREPARATION RE?UIRE(ENTS 'OR CO((ONLY USED COATINGS Coatin5 tpe
(ini;3; s3rface preparation
Drin5 oil Al7" Oleoresino3s P!enolic Coal tar Asp!altic &inl C!lorinate" r3::er Epo4 Coal tar epo4 Uret!ane Or5anic 8inc Inor5anic 8inc
Han" or power tool cleanin5 (SS&C7S&8 or 9) Co;;ercial :last (SS&C7S&:) Co;;ercial :last (SS&C7S&:) Co;;ercial :last (SS&C7S&:) Near w!ite or co;;ercial :last Near w!ite or co;;ercial :last Near w!ite or co;;ercial :last Near w!ite or co;;ercial :last
(SS&C7S&; or :) (SS&C7S&; or :) (SS&C7S&; or :) (SS&C7S&; or :)
Near w!ite or co;;ercial :last (SS&C7S&; or :) Near w!ite or co;;ercial :last (SS&C7S&; or :) Near w!ite or co;;ercial :last (SS&C7S&; or :) #!ite or near w!ite (SS&C7S&- or ;)
CO(PRESSOR HP
CO(PRESSOR CAPACITY C'(
RATING
0electric "ri9e1
+ / / M F +
F 3p 3p 3p 3p 3p 3p
to to to to to to
F + + +F /+ /M / /
NO66LE PRESSURE + psi
CLEANING RATE + (Stanar for com"arison)
psi
K/ appro4.
K psi
FK appro4.
F psi
M
M psi
PRESSURE LOSS IN AIRHOSE DUE TO 'RICTION HOSE SI6E LINE COUPLED PRESSURE END PSI
,
+ inc!
+-+,
C'( 'REE AIR PASSING THROUGH 'T. LENGTHS
M
K
+
+/
+
LOSS O' PRESSURE PSI<
M K + ++
+./ .K .M .
/.K +. +. +.
./ .M /.F /.
K.M .K . .
K.K M.M .
++.+ .
M K + ++
-
.M . . .
+./ .K .M .M
/. +. +. .
. /. +. +.
F./ . /. /.+
M K
-
./ .+ -
. ./ ./ ./
.M . . .
+. .M . .
+. .F .M
+ ++
< Press3re "rops for ot!er len5!ts in "irect proportion to c!an5e in len5t!
RULE O' THU(% %i55er an" s!orter are t!e 7e to :last !ose efficienc. If a c!oice ;3st :e ;a"e :etween !a9in5 a s!ort air !ose or a s!ort :last !ose c!oose t!e s!ort :last !ose.
RIGHT E>TERNALLY-'ITTED ?UIC$ COUPLING
#RONG INTERNALLY-'ITTED COUPLING
RULE O' THU(% A loss of press3re at t!e no88le of onl + PSI ;eans a + loss in pro"3ction
RULE O' THU(% C!oose t!e s;allest 5rain si8e w!ic! can re;o9e t!e conta;inant on t!at partic3lar s3rface. %i55er is not :etter !ere.
RULE O' THU(% It onl ta7es one spra painter to 7eep 3p wit! fo3r :lasters
AIR SPRAY 'EATURES 'inest ato;i8ation * finis! &ersatile Eas to 3se
PO#ER SOURCE Electric Gas Air
AIRLESS SPRAY 'EATURES Re"3ce" o9erspra * :o3nce-:ac7 Increase" pro"3ction (aterial sa9in5s La:or sa9in5s Ener5 sa9in5s I;pro9e" co9era5e
TYPICAL AIRLESS TIP SELECTION Paint tpe
Orifice si8e
Press3re
Acrlic ;o"ifie"
.+ tip
//
C!lorinate" r3::er
.+
//
Epo4 pola;i"e
.+
/
&inl copol;er
.+
- .+F
/
Epo4 a;ine
.+F
- ./+
//
P!enolic ;o"ifie"
.+
- ./
//
Antifo3lin5
./+
Inor5anic 8inc
./
- ./
Or5anic 8inc
./M
- .+
Coal tar epo4
.+
psi
/
/
- +K - +K
E>TERNAL IONI6ATION
CHARGED PRO%E
ELECTROSTATIC SPRAY 'EATURES Increase" transfer efficienc 'ewer passes #rap aro3n" e"5es * irre53lar s3rfaces
Lower ;aterial 3sa5e 'ewer reJects Re"3ce" la:or ($reater "ro!cti#it%)
SA'ETY HA6ARDS IN PAINTING OPERATIONS Hi5! places Hi5! press3res 'la;;a:le ;aterials To4ic ;aterials
HA6ARDOUS (ATERIALS IN SUR'ACE PREPARATION Aci"s Al7alis Stea; Partic3late ;atter in :lastin5 "3sts Lea" an" ot!er to4icants fro; ol" paint in :lastin5 "3st
HA6ARDOUS (ATERIALS IN PAINT APPLICATIONS 'la;;a:le sol9ents To4ic pi5;ents (lea, chromi!m, etc.) To4ic or aller5ic resins (!rethane, e"o*%, etc.)
(A>I(U( ALLO#A%LE CONCENTRATIONS O' SOL&ENT &APORS (4AC) Tpe of sol9ent Acetone Alco!ols %3tl Et!l Isopropl (et!l (Woo) %en8ene (3en
lene (>%lol)
< 'or K !o3rs e4pos3re@ PP( : 9ol3;e in air
/ F + / + / + + /
RESPIRATORS
Protection fro;=
D3rin5=
D3st
San":lastin5
R3st "irt scale particles
A:rasi9e :last cleanin5
To4ic f3;es fro; paints or sol9ents
'la;e cleanin5 Sol9ent cleanin5
'LASHPOINT AND E>PLOSI&E LI(ITS O' PAINT SOL&ENTS Tpe of sol9ent Acetone Alco!ol :3tl Alco!ol et!l Alco!ol isopropl %en8ene (enlene Tol3ene Nap!taQs
1 1 %it an" tar 1
Alco!ols
(et!lEt!lPropl%3tl-
$etones Esters
Acetone (E$ (I%$ (et!l- Et!lPropl- %3tl-
Et!ers
Glcolet!ers
TYPE O' PAINTS Epo4ies Pol3ret!anes C!lorr3::ers &inls Al7"s ACID
2 ALCOHOL
ALCID
AL$YD
%INDER 'UNCTIONS A"!esion Gloss &iscosit Protection weat!er water c!e;icals (ec!anical properties= stren5t! fle4i:ilit !ar"ness 'il;for;in5
