paint spec mirfa iwpp

MIRFA IWPP General Technical Requirement for Painting and Corrosion Protection Rev. C

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10.0 GALVANIZING

For surfaces where galvanizing is specified, all galvanizing shall be carried out by the hot dip process, and unless otherwise specified shall conform in all respects to BS 729.

The detailed design of members shall be in accordance with BS 4479.

11.0 PAINTING SYSTEMS

The following painting specification (Systems) are valid for the different purposes.

11.1 System No.1 : Structural steel- internal & external exposure.

At Works

Surface preparation: Blasting according to ISO8501 / ASTM-D 2200 Grade: SA 2.5 Prefabrication

Prime coat: Inorganic ethyl zinc silicate Dry film thickness 80 microns

Intermediate coat Epoxy polyamide Dry film thickness 80 microns.

Finish coat: Aliphatic Polyurethane finish Dry film thickness 80 microns

Total system minimum dry film thickness 240 microns.

At Site

Pre-treatment: Thorough cleaning to remove oil, grease, dirt and any

Other contaminants. Derusting of all mechanical damages according to ISO8501 / ASTM-D 2200

Grade: ST3

Prime coat: Epoxy zinc Dry film thickness 80 microns

Intermediate coat Epoxy polyamide Dry film thickness 80 microns.

Finish coat: Aliphatic Polyurethane finish Dry film thickness 80 microns

Note:

When airless spray application is not possible, 2 coats of epoxy polyamide cured finish can be applied by roller or brush to achieve specified thickness.


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11.2 System No.2 : Carbon Steel Surfaces up to 120 oC, internal exposure

Carbon steel surfaces, not insulated, indoors, such as air ducts, pipes, condensers, tanks and vessels' exterior surfaces, valves and fittings.

Temperature up to 120 oC

At Works

Surface preparation: Blasting according to ISO8501 / ASTM-D 2200 Grade: SA 2.5

Prefabrication Prime coat: Inorganic ethyl zinc silicate for steel structure

Dry film thickness 80 microns Inorganic ethyl zinc silicate for others including equipment Dry film thickness 75 microns

Intermediate coat Epoxy polyamide for steel structure Dry film thickness 80 microns Epoxy polyamide for others including equipment Dry film thickness 115 microns

Finish coat: Epoxy polyamide for steel structure Dry film thickness 80 microns Epoxy polyamide for others including equipment Dry film thickness 50 microns


At Site

Pre-treatment: Thorough cleaning to remove oil, grease, dirt and any Other contaminants. Derusting of all mechanical damages according to ISO8501 / ASTM-D 2200

Grade: ST3

Prime coat: Epoxy zinc for steel structure Dry film thickness 80 microns Epoxy zinc for others including equipment Dry film thickness 75 microns


Finish coat: Epoxy polyamide for steel structure Dry film thickness 80 microns Epoxy polyamide for others including equipment Dry film thickness 50 microns

Note:

When airless spray application is not possible, 2 coats of epoxy polyamide cured finish can be applied by roller or brush to achieve specified thickness.

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11.3 System No.3 : Carbon Steel Surfaces up to 120 oC, external exposure

Carbon steel surfaces not insulated, outdoors, such as airducts, pipes, condensers, tanks and vessels' exterior surfaces, valves and fittings and other surfaces.


At Works

Surface preparation: Blasting according to ISO8501 / ASTM-D 2200

Grade: SA2.5

Prefabrication

Prime coat: Single or two pack inorganic ethyl zinc silicate for steel structure Dry film thickness 80 microns Inorganic ethyl zinc silicate for others including equipment Dry film thickness 75 microns


Finish coat Aliphatic polyurethane for steel structure Dry film thickness 80 microns. Aliphatic polyurethane for others including equipment Dry film thickness 50 microns


At Site

Pre-treatment Thorough cleaning to remove oil, grease, dirt and other contaminants. Derusting of all mechanical damage according to ISO8501 / ASTM-D 2200

Grade: ST3

Prime coat: Epoxy zinc for steel structure Dry film thickness 80 microns Epoxy zinc for others including equipment Dry film thickness 75 microns


Finish coat: Aliphatic polyurethane for steel structure Dry film thickness 80 microns Aliphatic polyurethane for others including equipment Dry film thickness 50 microns

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11.4 System No.4 : Carbon Steel Surfaces up to 200 oC

Carbon steel surfaces not insulated, indoors and outdoors, such as structural steel, air ducts, pipes, tanks and vessels' exterior surfaces, valves and fittings.

Temperatures 121 oC up to 200 oC

At Works


Grade: SA2.5 Prefabrication

Prime coat: Inorganic copolymer for steel structure Dry film thickness 80 microns Inorganic ethyl zinc silicate for others including equipment Dry film thickness 75 microns

Intermediate coat: Inorganic copolymer for steel structure Dry film thickness 80 microns Silicone-acrylic for others including equipment Dry film thickness 25 microns

Finish coat: Inorganic copolymer for steel structure Dry film thickness 80 microns Silicone-acrylic for others including equipment Dry film thickness 25 microns

Total system minimum dry film thickness 240 microns for steel structure & 125 microns for others including equipment.

At Site

Pre-treatment: Thorough cleaning to remove oil, grease, dirt and other contaminants.

Derusting of all mechanical damage according to ISO8501 / ASTM-D 2200

Grade: SA2.5


Intermediate coat Inorganic copolymer for steel structure Dry film thickness 80 microns Silicone-acrylic for others including equipment Dry film thickness 25 microns

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Finish coat: Inorganic copolymer for steel structure Dry film thickness 80 microns Silicone-acrylic for others including equipment Dry film thickness 25 microns

11.5 System No.5 : Carbon Steel Surfaces up to 450 oC

Carbon steel surfaces, not insulated, indoors and outdoors, such as structural steel, air ducts, pipes, tanks and vessels' exterior surfaces, valves and fittings.

Temperatures 201 oC up to 450 oC.

At Works


Grade: SA 2.5

Prefabrication


Intermediate coat: Inorganic copolymer for steel structure Dry film thickness 80 microns Silicone-aluminum for others including equipment Dry film thickness 25 microns

Finish coat: Inorganic copolymer for steel structure Dry film thickness 80 microns Silicone-aluminum for others including equipment Dry film thickness 25 microns

Total system minimum dry film thickness 240 microns for steel structure & 100 microns for others including equipment.

At Site

Pre-treatment: Thorough cleaning to remove oil, grease, dirt and other contaminants.

Derusting of all mechanical damage according to ISO8501 / ASTM-D 2200

Grade: SA2.5


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Intermediate coat Inorganic copolymer for steel structure Dry film thickness 80 microns Silicone-aluminum for others including equipment Dry film thickness 25 microns

Finish coat: Inorganic copolymer for steel structure Dry film thickness 80 microns Silicone-aluminum for others including equipment Dry film thickness 25 microns

11.6 System No.6 : Tanks, Interior Diesel Oil

Tanks for light oil or diesel oil, internal surface, bottom and 1meter from bottom, roof and 1.5meters from the edge of roof.

At Works

Pre-treatment: Removal of all welding splatter

Blasting according to ISO8501 / ASTM-D 2200 Grade: SA 2.5

Finish coat: 2 coats of phenolic epoxy

Dry film thickness 125 microns each

Note:

For field erection tank, above painting system shall be applied at site.

The tank supplier can use a prefabrication with weldable inorganic ethyl zinc silicate / epoxy shop-primer after blasting to Grade SA 2.5 at works.

Dry film thickness 20-25 microns.

Shop-primer must be sweep-blasted at site and welding seams must be blasted according to ISO8501 / ASTM-D 2200 before applying the prime coat.

11.7 System No.7 : Tanks, Interior Water

Tanks for industrial, desalinated, deionized, demineralized and potable water

Temperature up to 60 oC , pH range: 4.5 - 9.5

At Works

Pre-treatment: Removal of all welding splatter. Blasting according to

ISO8501 / ASTM-D 2200

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Grade: SA 2.5

Finish coats: Solvent free epoxy tank lining Dry film thickness 300 microns


Note:

For field erection tank, above painting system shall be applied at site.

The tank supplier can use a prefabrication with weldable inorganic ethyl zinc silicate / epoxy shop-primer after blasting to Grade SA 2.5 at works.

Dry film thickness 20-25 microns.

Shop-primer must be sweep-blasted at site and welding seams must be blasted according to ISO8501 / ASTM-D 2200 before applying the prime coat.

11.8 System No.8 : Carbon Steel - Water Immersion

Carbon steel surfaces, intermittently or continuously immersed in seawater, fresh water or sewage water, such as:

- Inlet/ outlet structures, sheet piling and coastal works

- Hydraulic steel structures

- Interior of penstocks and manifolds

- Interior of cooling water pipes and piping

- Interior of vessels and tanks


At Works


Grade: SA2.5

Finish coat: Modified epoxy

Dry film thickness 300 microns

Total system minimum dry film thickness 300 microns

At Site

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Pre-treatment: Thorough cleaning to remove oil, grease, dirt and other contaminants. Derusting of all mechanical damage, reblasting of weld areas according to ISO8501 / ASTM-D 2200

Grade: ST3

Touch-up with Modified epoxy, dry film thickness 300 microns.

11.9 System No.9 : Galvanized Surfaces(No paint is applied, if otherwise)

Galvanized surfaces, requiring paint finish, indoors and outdoors


At Site


other contaminants

To obtain min. 25 microns anchor profile sweep blast surface.

If sweep blasting is not practicable, the surface should be etched.

Prime coat: epoxy polyamide Dry film thickness 50 microns

Finish coat: aliphatic polyurethane Dry film thickness 50 microns.

Total system dry film thickness 100 microns.

11.10 System No.10 : Aluminum and Stainless Steel Surfaces(No paint is applied, if otherwised)

Aluminum and stainless steel surfaces, requiring paint finish.


At Site


other contaminants.

Prime coat: epoxy polyamide. Dry film thickness 50 microns.

Finish coat: aliphatic polyurethane Dry film thickness 50 microns.


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11.11 System No.11 : Buried Pipes

Buried steel pipe work - external surfaces

At Works


Grade: SA2.5

Finish coat: Ultra high build epoxy. Dry film thickness 800 microns each.

At Site

Pre-treatment: Clean uncoated areas to remove oil, grease, weld slag and

loose dirt.

Grade : ST3

Finish coat: Ultra high build epoxy. Dry film thickness 800 microns each.

11.12 System No.12 : Electrical equipment

Equipment - such as control and relay panel, switchgear, motor control center, distribution boxes.

At Works

Pre-treatment: Removal of oil, grease, dirt, soil, salts and contaminants by cleaning

with solvent, vapor, alkali, emulsion or steam Water cleaning and drying

Finish coat: Powder coating by electrostatic spray guns Dry film thickness 60 microns


Note:

Equipment supplied with manufacturer's standard can be approved if the quality of the coating system meets the quality of above system.

The equipment supplier shall provide finish coat material enough for site application for all the surface in order to turn over the equipment to the Employer after hot commissioning.

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11.13 System No.13 : Plaster, Cement, Concrete or Brickwork requiring

Paint Finish

At Site

Surface preparation: Thorough cleaning to remove oil, grease, dirt and any

loose material.

Emulsion Paint Finish

Prime coat: Acrylic emulsion Dry film thickness 30 microns

Filler: Water-based epoxy filler as required to produce smooth and dense surface.

Intermediate coat: Acrylic emulsion Dry film thickness 30 microns

Finish coat Acrylic emulsion Dry film thickness 30 microns


Epoxy Paint Finish

Prime coat: Epoxy primer

Dry film thickness 50 microns

Filler: Water-based epoxy filler as required to produce smooth and dense surface.

Intermediate coat: Polyamide epoxy Dry film thickness 100 microns

Finish coat Polyamide epoxy Dry film thickness 50 microns


11.14 System No.14 : Bituminous Emulsion Coated Items Requiring Paint Finish

At Site

Surface preparation: Thorough cleaning to remove oil, grease and dirt.

Primer: Bituminous Emulsion Dry film thickness 100 microns


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Intermediate coat Bituminous Emulsion Dry film thickness 35 microns

Finish: Bituminous Emulsion Dry film thickness 35 microns


11.15 System No.15 : Battery Rooms, Chemical store room, Oil handing room, Etc.

Battery rooms and Chemical store room, Oil handing room wall and ceiling where a chemical oil resistant finish is required to plaster, concrete or brickwork.

At Site

Surface preparation: Thorough cleaning of surface to remove oil, grease and

dirt.

Primer: Epoxy primer Dry film thickness 50 microns

Filler: Water-based epoxy filler as required to produce smoother and dense surface.

Intermediate coat: Phenolic epoxy Dry film thickness 125 microns

Finish: Phenolic epoxy Dry film thickness 125 microns


11.16 System No.16 : Carbon Steel Surfaces Insulated

Carbon steel surfaces insulated such as pipe, condensers, tanks and vessels' exterior surfaces.


At Works


Grade: SA2.5

Finish coat: Inorganic zinc silicate Dry film thickness 75 microns

Total system dry film thickness min. 75 microns.

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11.17 System No.17 : Floors Requiring Dust-free Surface

Concrete floors which are required to be dust-free and which are exposed to light traffic.

At Site

Surface preparation: Prepare concrete by abrasive sweep blasting to remove any

laitance from surface.

Prime coat: apply one coat of epoxy primer sealer to concrete. Primer shall meet the moisture retention requirement of ASTM C 309 and be able to be applied as a concrete curing compound.

Primer shall also offer an over-coating period of up to one year.

Finish coats: 2 coats of high solids epoxy. Dry film thickness 100 microns per coat.

11.18 System No.18 : Embedded Material Painting or Galvanizing

At Site or At Work Surface preparation: Blasting according to ISO8501 / ASTM-D 2200

Grade: SA2.5

Finish coat: zinc rich epoxy primer. Dry film thickness 60 microns

11.19 System No.19 : Alloy Steel Surfaces Insulated

Alloy steel surfaces insulated such as pipe, condensers, tanks and vessels exterior surfaces etc.

Temperature up to 600 oC.

At Site


Grade: SA2.5

Prefabrication

Finish coat: Silicon primer Dry film thickness 25 microns


12.0 REPAIR PROCEDURE

The Supplier shall submit the repair procedure for touch-up or complete repainting of the equipment supplied by supplier, before issuing of Provisional Acceptance Certificate.

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paint spec mirfa iwpp

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