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1. PURPOSE
This procedure is to specify technique for surface preparation and paint application for 53K Diamond project
2. SCOPE OF APPLICATION
This procedure is applied for shop primer workshop, block and hull stage.
3. REFERENCE DOCUMENT
- Technical Agreement (between Vinashin and Sigma Coatings), Sigma Coatings Ballast Tank – Working Procedure, Sigma Coatings Manual and Sigma Painting Specification.
- ISO 8501 – 1: 1988 Part 1, ISO 8501 – 2: 1994 Part 2, ISO 8501 – 3 Part 3
4. DEFINITION
- Abrasive: Mixture of steel shot and grit at 30% - 70%, or 50%-50% or copper slag to be used.
- QC: surveyor from Q.C department.
- DFT: Dry Film Thickness
5. TECHNICAL REQUIREMENTS
- Surface must be blasted to Sa 2.5 and surface profile should be between 40-70m
- Where alkyd paints, bitumen solution, etc. are used, the surface should be ground to St2, and where epoxy paints is used, the surface should be ground to St3.(and according to specification per area)
- Each coating film thickness must be reached to specified DFT required by Sigma and Owner.
- The relative atmosphere must not exceed 85% and the temperature of substrate must be at least 3P0PC higher than the dew point of the atmosphere.
6. CONTENT
6.1 UWorkshop, material, equipments and personnelU
* Temporary block blasting and painting workshop is under construction. (Blasting workshop shall have dimension of L18m x B32m x H9m and be full close covered in order to avoid environment pollution which may affect blasting and painting process. Ventilation/Dehumidification is arranged for safety operation during block’s blasting and painting process as well as curing time).
* Main equipment for blasting and painting:
- Sufficient protective clothes, gloves, overshoes, mask, helmet and muffler.
- Air – Compressor (4 main plus 2 emergency totaling 6). Capacity of each is 20mP3P/ minute. (Pressure of compressed air should be enough for providing workshop sufficiently with clean and dry air and should maintained at 7kg/cmP2 Pand 300 CFM ftP3P/minute for each blaster)
- Sufficient Movable blasting machine for the first vessel, this type is fixed for the rest.
- Sufficient Air – grinding machine.
- Welding machine for re-welding after blasting.
- Sufficient sand disc-grinding machine, rotary wire grinding machine, brush, hammer for rust removing.
- Brush, clothes and industrial vacuum cleaner for cleaning after blasting.
- Sufficient painting brush, adhesive tape, marking pen, chalk.
- Sufficient paint spraying pumps (currently, 5 are available for diamond project, manufactured by Graco, type 63.1 from America.)
- Sufficient air-type paint mixing machine.
- High volume ventilator
- Abrasive should be clean, dry, without impurity and contaminant and having different diameter and shape. Abrasive moisture content should not be over 0,5% in weight)
- Stable – sufficient scaffold and ladder are required for blasting and painting process to ensure that maximum safe access to all surfaces is obtained.
U6.2 Surface preparation
Steel work in the block stage before blasting (refer to ISO 8501-3 Part 3)
- Any steel repairs, welding or burning to be completed prior to surface preparation (including grinding of sharp edges and cut outs welding slag).
- Free from air pollution from outside. (such as dirt, raining water, high humidity)
- Surface assessment before blasting, attention should be paid to weld seam, welding slag and other foreign substances on steel surface.
- Grease and oil should be cleaned with degreaser/ detergent and removed by fresh water, scrap material contamination and dirt should be removed
- Spigots (if necessary) to be cut prior to abrasive blasting or grinding
- Cover all non-steel items (such as galvanized, copper pipe, machinery loosing parts) with suitable cover for protection to prevent damage during blasting.
- Checking cleanness and dimension of abrasive, checking compressed air with pressure of 7kg/ cmP3P.
- Block edges (welding joins) and the ends of each detail are covered before carrying out painting.
- Surface check and preparation (See reference documents)
Blasted steel surface after blasting in the block stage
- Blasted steel surface must be reached to Sa2.5 and remained matter such as oil or grease contamination (caused by grinding, re-welding smoke, marking chalk etc) dust and residue of grit must be removed.
- Blasted surface must be kept away pollution and bad weather (such as dirt, raining water, high humidity)
Where cleanness can not be achieved by blasting, grinding can be allowed to achieve St2 (St3) per specification and area, such areas should be kept to minimum.
- After blasting, abrasive are to be recovered and surface is to be cleaned with industrial vacuum cleaner, compressed air, and brush.
- Team leader is to examine block surface first and carry out any necessary remedies before requesting Q.C surveyors for inspection.
- Final inspection is to be done with pictures of Sa 2.5 and St2, St3 per specification.
- Where area of edges will be welded or welded line will be tested in the future, should be marked with adhesive tape.
Coated surface treatment after erection in the hull stage
- The areas where nearly block jointing edges used to have brackets (Which are used to blocks during jointing and welding blocks). They must be cut out and grinded. The small holes caused by welding, gas-cutter, etc. must be re-welded and re-ground.
- The seams and the heat affected zone should be done as follow:
+ The surface damaged by burning and heating is to be removed by sand disc grinding machine.
+ The space between the seams and the painted areas which should be cleaned is 10-20cm from the seams.
+ For the area covered by adhesive tape and step painting method the painted surfaces should be feathering edges
- Damaged painted areas caused by welding and burning, block joints and the area around them should be cleaned all dirt, dust.
- Manpower should be distributed reasonably to concentrate on and complete area by area.
- Areas coated by step painting method at block stage should be roughness by means of grit sweep blasting or sand-disc.
- Block joint and damaged areas are prepared to Sa 2.5, St2, St3 according to specification and cleaned.
- Oil, grease should be removed by suitable solvent. After that, the surface is cleaned with air blow and clean cloth.
- Cleaned surface must be kept away pollution and bad weather from outside. (such as dirt, raining water, high humidity)
U6.3 Paint application
6.3.1 Shop primer (Not applied for the first vessel)
- The function of shop-primer is to protect steel during block fabrication.
- Steel plates are abrasive blasted and applied with shop primer by the automatic shop priming plant.
- If surface is not painted completely, hand paint praying gun should be employed for small area, large areas, and the plate(s) should be re-blasted and re-painted by the automatic priming plant.
- The film thickness must be reached to Sigma Specified DFT.
6.3.2 Paint application in block stage
Blocks blasting are to be done inside blasting and painting workshop. Painting is to be done only after preparation steps are complete.
- At the positions that are adjacent to the block edges (welding joins), each coat should be far from these edges 100mm and have a minimum of 100mm among coats.
- Areas where will be welded and exposed to the heat, or tested for weld seams are not painted (should be marked by adhesive tape)
- Painting process should be done continuously and fairly. Avoid painting too long on one area and on the painted areas
- Each of coat layers, if over coating interval time has been exceeded; sandpaper or light sweep blasting may be required in order to obtain sufficient roughness before next coat.
- Stripe coat of all weld seams, back of bar, edges of cut outs, scallops, etc. The first coat of the system must be followed by a stripe coat prior to spray application of the subsequent coat.
- Equipments and other tools should be recollected; dropped paint should be cleaned after painting work is finished. All pumps, lines, spray guns shall be flushed through with Sigma solvent immediately.
Note:
- During surface blasting and painting, relative humidity must be less than 85%.
- During painting is carried out in closed space, it’s necessary to arrange additional ventilators during painting and drying of paint layer.
- After drying, additional paint is to be done for incomplete area.
- Inspection of QC surveyor, painting manager, paint representative and paint specialist of Owner. Any imperfection must be marked and repaired immediately.
Quality inspection for every paint layer.
- Team leader is to check the quality of the paint layer (dry film thickness is measured and marked on surface). Any imperfection must be repaired before informing QC dept. for inspection.
- Team leader is to check wet film thickness at a number of points during painting. Any defect as sags, over spray, etc. are to be repaired in wet condition and rectified.
- Checking the wet film thickness during paint application process and free from over-spray, curtaining, sags, holidays, missing areas, grit and dirt inclusion.
- When the paint layer dries, team leader is to check and repair all defects (if any) by touching up with brush/roller for small areas, large areas are to be re-sprayed.
- For all locations, 85% of measuring points must not be less than the specified DFT, and the rest 15% measuring points must not be less than 85% of the specified DFT.
- Some common imperfections such as dust on painted surface, required DFT not achieved, etc. Any such defects must be repaired before applying the second layer.
- If interval time for second paint application is longer than specified, abrasive paper or sand disc should be employed to create roughness for painting. For immersion areas, light grit sweep blasting may be required to achieve sufficient roughness before next coat.
- After drying, QC surveyor must carry out inspection first and ask for repair if any defect is found and inform paint representative and Owner the time and date of inspection.
6.3.3 Paint application after block erection on slipway (in hull stage)
Note: At this stage, good scaffolding to be arrange to ensure safety for working
(At this stage, Mostly works are painting the areas where are damaged by welding, burning and block joints edges during jointing blocks and modules)
- Workers should be distributed reasonably to concentrate and complete area by area to prevent rusting again.
- Painting area should be prepared enough for painting with spraying machine. Paintbrush or roller should only be used for small spot where spraying gun can not be applied.
- Anti fouling shall be applied before launching, final performance, color decorating paint before applying the previous surface shall be cleaned, (flushed with fresh water and blown with cleaned, dry compressed air or cleaned with cloth, rag)
- DB ballast tanks and peak tanks to be repaired before launching.
- QC surveyor and paint manager should carry out self-inspection prior inspection request.
Quality inspection for every paint layer(as the paint inspection in block stage as above).
Final inspection for painting work
- DFT as specified in building specification shall be achieved.
- Each coat system must be a closed film and free from over-spray, curtaining, sags, grit and dirt. Such defects are to be repaired.
- The used tools and material shall be cleaned.
- Before asking for final coat inspection, QC surveyor and engineers must carry out inspection and repair and request Sigma and Owner for inspection.
- After final coat inspection is accepted, dismantle the scaffold and move it out of the tank, which doesn’t make paint film damaged.
- The areas damaged during the dismantling is to be prepared and brought up to required standard and DFT as in accordance with this specification, product data sheets and Paint Representative and Owner’s instructions.
- QC surveyor must inform the Paint Representative and Owner the exact time.
- Painting work is considered completed only when final inspection is accepted by Paint Representative and Owner.
6.4 Requirements for painter.
- Painter should be well trained and certified workers and fully equipped with safety clothes and equipment.
- All workers, including QC must wear overshoes on their boots/shoes on blast cleaned surfaces and fresh painted substrates.
7.Annex.
APPENDIX
Surface check and preparation

Defect Preparation grade
1. Weld seam
1.1 Weld spatter
Surface must be free of spatter and undercut
1.2 Weld ripple/ profile
Surface must be fully dressed smooth


1.3 Welding flux slag
Surface must be free of slag
1.4 Undercut
Surface must be free of deep or jagged undercut.
1.5 Weld Porosity
Surface must be free of visible pores
1.6 End craters
Surface shall be free from visible end craters. Insert welding is required
2. Edges
2.1 Rolled edge
Edge must be rounded with R < 2

2.2 Edges made by punching/ shearing or sawing Edge must be rounded with R < 2
2.3 Thermally cut edges
Cut face to be removed and cut edge shall be rounded with R < 2

3. Block surface
3.1 Pits and craters Surface shall be free of pits and craters
3.2 Shelling/ hackle Surface shall be free from visible shelling
3.3 Roll-overs/ roll lamination/ cut lamination Surface shall be free from visible rolled-over/ lamination
3.4 Rolled-in extraneous matter Surface shall be free from rolled-in extraneous matter
3.5 Grooves and gouges formed by mechanical action Surface shall be free from grooves and radius of gouges
3.6 Indentations and rolled marks
Surface shall be free from indentations and rolled marks

SƠN TÀU BIỂN CÁC LOẠI

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