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SURFACE PREPARATION AND PAINTING PROCEDURE

1.0 General

1.1 All structural steel etc. shall be treated in accordance with this

procedure of which the coating manufactures instruction and data

sheets form a part.

1.2 If any phases not meet the required standard the contractor shall carry

out necessary rectification in accordance with this procedure.

1.3 All coating materials shall be supplied to the work-site in their

original unopened and clearly identifiable containers.

1. !oating materials shall be used before the e"piration of their shelflife.

2.0 Scope

2.1 #his procedure co$ers the minimum requirements of surfacespreparation and application of protecti$e coating for Incinerator and

steel structure construction.

2.2 %urfaces to be embedded in concrete are not required to be coated.

2.3 &aint shall not be applied on following surfaces unless otherwisespecified.a.Inorganic material such as concrete' brickwork' tile' slate' glass and

plastics.

b. (on-ferrous material such as hot-dip gal$ani)ed steel'weathering steel' stainless steel' brass' copper and aluminum

etc.

c.(ameplate and other identification plates or label *to be shielded' to

protect damages during surface preparation and paintingmaterial application operation+.

3.0Reference

3.1 %teel %tructure &ainting !ouncil *%%&! , %& 1+ %a , 2-12

3.2 #echnical /ata 0#(4 product.

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4.0 Surface preparation

.1 %urface preparation by pickling or chemical treatment only is notpermitted.

.2 5last cleaning shall not be conducted when the temperature of thesurfaces is less than 67 abo$e dew point of the surrounding air' or

when the relati$e humidity of the air is more than 89.

.3 Any oil' grease' dust' or foreign matters deposited on the surface after

surface preparation shall be remo$ed prior to painting.

. All rough welds' burrs' weld spatters' indentations and all other sharpsurface pro:ections shall be ground smooth prior to further surface

preparation.

.6 %teel and fabrication defects such as weld spatter' sharp edges ofwelds' de-laminations scabs and sli$ers $isible before or re$ealed by

blast cleaning shall be repaired prior to coating.

.; %urface requiring paint treatment shall be sand blasted in

accordance to the requirement.

.< 5lasting shall not be performed in the same area where coating or

curing of coated surface is in progress.

.8 5lasting equipment shall be in good operating condition.

.= After blasting and immediately prior to coating' the blasting dust shallbe remo$ed by using a high-pressure air blow off and followed by$acuum cleaning.

.1 Abrasi$e shall be dry and oil-free. il and water separators shall beused in compressed air lines to remo$e oil and moisture from air

before it is used. %eparators shall be placed as close as possible to the

blast equipment.

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5.0 Application of coatin

6.1 >uantity of painting material to be mi"ed shall be according to si)e of

area to be coated.

6.2 ?i"ing and application of coating material shall be in accordance

with the coating manufactures published instructions.

6.3 &aint shall be applied within hours after the surface ha$e beenprepared' but in any e$ent before $isible rusting occurs.

6. &aint shall be applied by means of brushing' rolling or spraying.

6.6 %pray equipment shall be in good operating condition.

6.; #he steel surfaces shall be clean @ free from contamination.

6.< &aint shall not be applied to the wet or moisture surface.

6.8 &aint works shall be applied when the surface temperature of steel

shall be between 67 and 17 and not less than 67 abo$e dew

point.

6.8 &aint works unless otherwise specified shall not be performed when therelati$e humidity is more than 89.

6.= #raps shall be used in air supply lines to remo$e moisture and oil.

6.1 hen welding' cutting will damage coating and so on the in:ured

parts must be repaired by the same coating material to primer.

6.11 &ressure pots shall be equipped with mechanical mi"ers to keep the

pigment in suspension.

6.12 #he repair of the damaged coating shall be application of the total

number of coating layers by means of brushing' rolling or spraying.

6.13 Bun' sags' drips or o$er spray which cause failures by loss of

adhesion' blistering' peeling' mud cracking or rusting of substrate

shall not be permitted. /efecti$e areas shall be re-blasting and re-coated.

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6.0 !aterial "an#lin an# $torae

;.1 !oating materials shall be deli$ered in the manufactures original

sealed containers besting legible labels.

;.2 #he sides of each container shall ha$e the following information

listedC

a. ?anufactures nameb. &roduct name and number

c. &roduct color designation

d. &roduct batch number and manufacturing date

e. &roduct shelf life e"piration date

;.3 ?aterials from damaged containers shall not be used in the work.

#he containers of coatings or thinner shall not be opened unless

ready for immediate use.

!oated steel or components shall be rested on wooden supportsduring shop storage or shipment. If it is necessary to stack members'

wooden separators shall be used. !oated steel or components shall

at no time be placed directly on other steel or directly on the ground.

%.0 In$pection an# te$tin

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c. #he air blast *free of sand+ shall be directed toward a clean

white absorbent paper or cloth for 2 minutes to detect any oil

or moisture is not detectable.

d. Inspect blasted surfaces immediately before application of the

coating as follows.!oating application shall proceed only when results of the

inspection are acceptable to %ellers qualified coating

inspection.1. !heck for dryness by $isual inspection.

2. !heck for flash rusting $isually. If rusting is detected'

surfaces are re-blasted until acceptable.

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&.0 E'tent of t(e )or*

8.1 #he following surface and material shall require painting.

a. !arbon steel and low alloy steel.

8.2 #he following surface' products or items are not to be painted.

a. %urface used for identification purpose such as nameplate'serial number plates' under writers appro$al plates' and

$al$e identification signs.

b. (on-metallic products.

c. ?achined surface of equipment.

+.0 Paintin $,$te-

=.1 H"ternal painting system

=.2 !oating shall be applied for the out side of incinerator only.

=.3 %ol$ents' thinners' and cleaners shall be the product of the coatingmanufacturer products from different manufacture shall not be

intermi"ed.

=. Application C

No De$cription OTUN Pro#uctNo. of

CoatDFT

1. Inorganic Jinc &rimer &rosil J%& 1 1

Hpo"y Intermediate &enguard #! 1