COATING PROCEDURE

1. S C O P E

This procedure covers the minimum requirements of surface preparation and protective coating , shall apply to shop and field protective coating.

2. REFERENCE

This procedure refers to the following :

2.1 SSPC-SP, Steel Structure Painting Council-Surface Preparation2.2 NACE, National Association of Corrosion Engineers2.3 Coating Specification CPI, SP-ME-ME-025 rev12.4 Paint Manufacture Technical Data Sheet

3. GENERAL

3.1 Paint works of all pipe, plate steel etc, shall be treated in according with this procedure of which the paint manufacture’s instruction and data sheets from apart. Data sheet of painting must be described product data actual painted to following ( recommended use, physical content, application details, surface preparation, application condition, safety & handling )

3.2 Material handling and storage shall be done as follows :

3.2.1 Coating material shall be delivered in the manufacturer’s original sealed containers bearing legible labels.

3.2.2 The sides of each containers shall have the following information listed :

Manufacture’s name Product name and number Product colour designation Product batch number and manufacturing date Qty as per Gallon or Can painted ( contain litter )

3.2.3 Materials from damaged containers shall not be used in the work, the containers of coatings or thinners shall not be opened unless ready for immediate use. Paint materials shall be used before the expiration of their shelf life.

3.3 Only specified coating system an a company accepted brands shown on the coating system data sheets shall be used, unless alternates are approved by company in writing. Manufacturers direction shall be followed. Each multi-coat system shall use materials from a single manufacturers unless otherwise approved by company in writing.

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3.4 The application of coating materials is specified by both dry film thickness ( DFT ) range for each coat and the minimum total dry film thickness of the system. The number of coats shall be the minimum number of coats to achieve the required dry film thickness as recommended by paint manufacturer.

3.5 Weld joint shall not be coated until NDE satisfactorily completed.

3.6 All the applicator personnel shall be trained, competent and have experience in blasting, coating application and inspection.

4. SURFACE PREPARATION

4.1 Before blast cleaning performed, visible deposits of oil, grease, or contaminants shall be removed by any of the methods specified in SSPC-SP 1 or other agreed upon methods by company.

4.2 Before blast cleaning surface inspections such as weld spatter, burning slag, sharp edges etc, should be removed in accordance with SSPC-SP 2 and 3. ( hand tool and power tool cleaning ).

4.3 Surface shall be blasted in accordance with company spec(Chevron Manual).This category of surface preparation shall be applied for all carbon steel and iron surfaces prior to priming.

4.4 After completion of blast cleaning in any area traces of shot or grit and dust shall be removed from the surfaces by clean dry and oil free compressed air or vacuum cleaning.

4.5 Blasted surfaces shall be checked for cleanliness with visual standard SSPC-VIS-1/equivalent Swedish Standard and anchor pattern with Keane Tator Comparator or measured by press-O-film tape tester.

4.6 Blasted surfaces meeting the specified surface preparation requirements shall be painted with the specified first coat / primer the same day as they are blasted and before any visible rusting, discoloration or other surface contamination occurs.

4.7 Abrasive blast cleaning shall be performed by experienced operators s with approved equipment.

4.8 Dry abrasive blast cleaning is not permitted under any of following condition :

4.8.1 Relative humidity greater than 85% for external4.8.2 Any visible moisture is on the surface4.8.3 The abrasive material is wet4.8.4 When painting is being applied or coating is drying and curing in

adjacent area

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4.8.5 When the surface temperature is less than 5F or 3C above the dew point

4.9 Spot blast cleaning shall conformed to original specification company spec

5. COATING APPLICATION

5.1 Surfaces shall be clean, dust free and dry, any of oil, grease, or foreign matters deposited on the surface after surface preparation shall be removed by solvent cleaning or using high pressure air blow off prior to painting.

5.2 Handling, mixing, thinning, application and curing of coating material shall be performed in accordance with the coating manufacturers latest published instructions and technical printed data sheets. The applicator shall have copies of these data sheets.

5.3 Application of paint shall be applied by means of airless spray, conventional spray, brush and roller may be used on all areas which cannot be properly spray coated for any reason. Company written approval is required before brush or roller application can be substituted for spray application. Paint shall be work into all crevices and corners, all runs or sags shall be brushed out immediately.

5.4 All coating done out doors / open area shall be done in daylight hours and be completed at least one hour prior to sundown. Indoors coating is allowed 24 hours a day if the specified metal and air temperatures and relative humidity requirements are met inside the building at all times during cleaning, coating and curing.

5.5 No coating shall be applied under any of following conditions :

5.5.1 When relative humidity is above the manufacturers written recommendation.

5.5.2 When temperature of the metal is less than 5F or 3C above the Dew point.

5.5.3 When the ambient temperature is below 5F or 3C without company’s written approval.

5.6 All component shall be mechanically stirred before coating for such time

as necessary to ensure that the pigment, vehicles and thinners are thoroughly mixed. The mixed coating shall continuously stirred during application by mechanical spray pot agitators or other approved means if required by manufacturers or company. All mixing shall be done in clean containers, free from traces of grease, or other coating or other contaminants. All containers shall be kept covered to prevent contamination by dust, dirt, rain, etc.

5.7 The coating manufacturers recommended pot life shall not be exceed, and when this limit is reached, the spray pot must be emptied and cleaned, the coating destroyed and new coating mixed.

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5.8 Coating shall be applied in not less then number of coats specified and shall have individual coat dry film thickness not less than the minimum thickness specified. All coating film thickness shall be checked, strictly adhered to and shall be free of pinholes, bubbles and other defects. Film thickness are to be measured with a wet film gauge during application. Film thickness shall be verified, checked and maintained during and after each application of each individual coat. Thickness requirements shall be met with each coat and if too thin, the total thickness shall not be “ made up “ in any one coat I, e., another coat shall be applied. Where film thickness do not meet specification and / or defects ( holiday ) are found, corrective shall be taken.

5.9 Dry film thickness shall be within the range recommended by the Company or manufacturers

5.10 All coatings shall be allowed to dry thoroughly for at least the minimum time recommended, considering temperature and humidity, before applying succeeding coats, When maximum overcoat time is recommended by the manufacturer, it shall be exceeded before applying the succeeding coat.

5.11 Each coat ( primer, intermediate coat(s) and top coat ) shall be inspected

by Contractor/Applicator and may be inspected by Company before applying further coats.

5.12 Prior to application of any coat, all damages to previous coats shall be repair.

5.13 Primer Coat

5.13.1 Bare surfaces shall be primed with one coat as indicated in specification.

5.13.2 Constrain associated with applying the prime coat are as follows :

A Prime coat shall be applied within 5 hours of the star of blast cleaning.

The complete coat shall be free of defects (e, g., pinholes, voids, bubbles, runs, sags). Defective areas shall be repaired by additional coating or removed and recoated.

Primed surfaces exposed to polluted atmosphere shall be scrubbed with fresh water and dried prior to over coating. When bare metal is exposed during the cleaning of previously coated steel, a prime coat shall be applied to the exposed areas before proceeding with the application of the intermediate or finish coat.

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5.14 Intermediate Coat.

5.14.1 Before applying Touch up and Intermediate :

Remove oil, grease with suitable detergent water. Remove salt, waste abrasive, sand or other by high pressure air. When re-coating interval is exceeded, do roughening of the

surface by power tool clean or wire brushing / sand papering.

5.15.2 Any of lower dry film thickness on each coat shall be re-spray to specified thickness before next coat applied.

5.15.3 After paint is applied, wet film thickness must be regularly checked in order to achieved the specified Dry Film Thickness.

8.16.1 Steel pipe which have been jointed, shall be painted after the jointed surface have been cleaned by light blasting or wire brush.

8.16.1 Intermediate painting shall be done after erection work is completed. Painting of next coat shall be applied after Owner approval of preceding coat.

8.16.1 Each coat of paint shall be allowed to dry for a minimum of certain hours as per paint manufacturer’s recommendation.

8.16 Top Coats

8.16.1 Top coat shall consist of an undercoat and overcoat application of coat to the prime coat the under coat shall be tinted slightly from the over coat colour specified to provide a colour difference.

8.16.1 Top coat application and colour requirements shall be as follows :

Each coat of coat shall be dry to the touch prior to application of the next coat.

Coat mixed shall be applied within the time limit specified by the manufacturer.

The tinting material shall be compatible with the coat system and shall not be detrimental to its service life.

If manufacturers maximum re-coat times ( re-coat interval) are exceeded, special surface preparation shall be carried out as recommended by manufacturer and approved by Company.

8.17 TOUCH-UP AND REPAIR WORKS.

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The damaged parts caused by burns, welds, scratches, impact and so on during assembly, handling, storage, shipping and erection, coating defects such as loss of adhesion, blistering, peeling, mud-cracking, runs and sags, overspray, etc. must be rectified in accordance with repair procedure.

8.16.1 Coating material for touch-up must be the same paint to before. 8.16.1 Repair process.

When the coating is damaged down to the steel and spot touch up is necessary, these areas shall be spot cleaned by blasting or power tool.

All of the loose or damaged coating shall be removed “ over blast “ shall be prevented by using shields, canvas or vacuum blasting equipment.

After the metal surfaces has been properly cleaned, the coated areas around the repaired areas shall be feather edge. Feather edging shall be by power or hand sanding with sand paper.

The coating application in accordance with coating system.

8 INPECTION

8.15 Contractor shall perform all inspections necessary to assure that surface preparation and coating application complies with the requirements of the Company specification. The Work shall be subject to company inspection.

8.16 The indicated records shall be kept daily and shall be submitted to company daily again and again at the completion of the job.

8.17 The inspection equipment shall be prepared as below :

6..3.1 Sling Psychrometer & Psychrometric table/Dew point calculator.6.3.2 Magnetic surface temperature.6.3.3 Needle Air Pressure Gauge.6.3.4 Visual Standard Book.6.3.5 Keanetator-Comparator.6.3.6 Micrometer-Replica Tape.6.3.7 Wet Film Thickness Gauge.6.3.8 Dry Film Thickness Gauge6.3.9 Holiday Test (Wet Sponge)

6.4 The Contractor shall perform the following Inspection and Testing.

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6.4.1 At the beginning of each days operation and again immediately prior to any coating, the ambient condition shall be checked and recorded. ( See form 01 ). Ambient temperature. Humidity ( RH % ). Dew Point Temperature. Steel Surface Temperature.

6.4.2 Pre Inspection ( Pre-Job Check Out )

Review Specification. Check Pipe surfaces for inaccessible areas, weld spatter

etc. Check surface for grease, oil, moisture, etc. Check abrasive for cleanliness, dryness, type and size. Check compressed air for oil and moisture and nozzle air

pressure. Check that proper coating and thinners are present, see the

coating has not passed its shelf life. Record product name, manufacturer, and batch number.

6.4.3 Surface Preparation Inspection

Blasted surfaces shall be inspected by the following methods to verify that the specified surface preparation has been achieved.

Check ambient conditions, accordance with paragraph 6.4.1. Check degree of surface cleanliness by comparison to the

appropriate Visual Standard. Check surface profile by Testex Inc. “Press-O-Film” or

equivalent. Check dust and abrasive removal. Take magnetic base reading.

6.4.4 Coating Application Inspection

Application – First Coat.

Check surface for flash rusting. Check ambient conditions. Check steel temperature. Check proper mix ratio observed. Check for proper thinner addition ( when necessary ). Check Wet Film Thickness.

Application - Subsequent Coats.

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Check dry film thickness of preceding coats. Check recoat times observed. Check intercoat surfaces cleanliness. Check ambient conditions. Check steel temperature. Check proper mix ration, and thinner addition. Check wet film thickness.

Final Inspection.

Check visual appearance. Check dry film thickness. Holiday test ( Required only for interior of tank ) Cure test. Verify all touch-up and repair work. Complete records, verify compliance to specification.

7 SAFETY REQUIREMENT AND EQUIPMENT

7.1 Safety Requirement

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7.1.1 Explosion PreventationWhen working in enclosed spaces ( Tank Interiors) the solvent vapour concentration shall be less than 20% of the lower explosive limit (see attachment Table 1 & 2 in Coating Specification CPI, EMS-S-4743)

7.1.2 ToxicityPersonal shall not remain in or enter the tank without supplied breathing aperture if the solvent vapour concentration is greater that permitted by the permissible exposure limit (PEL) see table 1 or if the oxygen concentration is less than 18% by volume

7.1.3 FiresFlammable liquid shall not be stored inside the tank. Liquid which are stored or used at a temperature above the flash- point temperature shall not be exposed to flames.

7.1.4 All the equipment shall be suitable for the purpose intended and shall be equipped with functional pressure regulators, air-water separators, gauges, controls etc.

7.1.5 All equipment shall be maintained and kept in satisfactory condition to permit surface preparation and coating application in accordance with specification.

7.2 Personal Protective Equipment.Contractor shall provide the following protective equipment for all personnel who blast and coat :

7.2.1 Blasting :

Heavy protective clothing. Heavy leather shoes. Leather gloves. Fabric hood or hard helmet hood. Face shields. Respirator and hearing protection.

7.2.2 Coating :

Heavy protective clothing. Heavy leather shoes. Leather gloves. Supplied and breathing apparatus and goggles. Barrier cream for exposed skin.

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