This piping repair method statement defines and guides to painting and coating works for any kind of project or structure. This method statement is applicable to the protective painting and coating for piping and supports at any construction project site.
The latest revision of the project specifications and following international standards shall be used as references and are part of this mechanical method statement in the execution of work.
SSPC: The Society for Protective Coatings, Specifications:
SSPC-PA 1 Shop, Field and Maintenance Painting
SSPC-PA 2 Measurement of Dry Paint Thickness with Magnetic Gauges
SSPC-Vis Pictorial Surface Preparation Standards for Painting Steel Surface
SSPC-SP 1 Solvent Cleaning
SSPC-SP 2 Hand Tool Cleaning
SSPC-SP 3 Power Tool Cleaning
SSPC-SP 8 Pickling
SSPC-SP 10 Near-White Blast Cleaning
SSPC-SP 11 Power Tool Cleaning to Bare Metal
Swedish Standards Institution, Stockholm 3, Sweden: SIS 055900 Pictorial Surface Preparation Standards for Painting Steel Surfaces.
ANSI/ASME: American National Safety Institute/American Society of Mechanical Engineers
ANSI Z535.1 Safety Colour Code for Marking Physical Hazards
ASME A13.1 Scheme for the Identification of Piping Systems
American Society for Testing and Materials (ASTM)
ASTM D1535 Standard Method for Specifying Colour by Munsell System
ASTM D4541 Standard Test Method for Pull-Off Strength of Coatings Using Portable Adhesion Testers
ASTM D5402 Standard Practice for Assessing the Solvent Resistance of Organic Coatings Using Solvent Rubs
ASTM D4752 Standard Practice for Measuring MEK Resistance of Ethyl Silicate (Inorganic) Zinc-Rich Primers by Solvent Rub
ISO Standards Related to Touchup Paint Methods
ISO 2808 Paints and Varnishes-Determination of Film Thickness
ISO 4624 Paints and Varnishes-Pull-off Test for Adhesion
ISO 8501-1 Preparation of steel Substrates before Application of Paints and Related Products visual Assessment of surfaces Cleanliness.
ISO 2178 Non-magnetic coatings on magnetic substrates. Measurement of coating thickness Magnetic method
ISO 8502-3 Preparation of steel substrates before application of paints and related products — Tests for the assessment of surface cleanliness — Part 3: Assessment of dust on steel surfaces prepared for painting (pressure-sensitive tape method)
ISO 2409 Paints and varnishes — Cross-cut test ISO 8501-3 Preparation of steel substrates before application of paints and related products – Visual assessment of surface cleanliness — Part 3: Preparation grades of welds, edges and other areas with surface imperfections
ISO 8502-4 Preparation of steel substrates before application of paints and related products –- Tests for the assessment of surface cleanliness — Part 4: Guidance on the estimation of the probability of condensation prior to paint application
ISO 8502-6 Preparation of steel substrates before application of paints and related products -Tests for the assessment of surface cleanliness — Part 6: Extraction of soluble contaminants for analysis -The Bresle method
Definitions & Units
ADFT: AVERAGE Dry Film Thickness
DFT: Dry Film Thickness
RH: Relative Humidity
1 Micron = 1/1000 mm
1 Mils = 25 micron
Roles & Responsibilities for Painting Repair
Construction Engineers (Supervisors)
- Responsible for the execution and management of the construction safety, quality, progress control and follow-up of all the relevant plans.
- Assist in compilation of Painting Construction Procedure.
- Check the issuance of the equipment and materials
- Assist in the interpretation of the drawings and solve the problems, if any, by providing the suggestions due to the design errors or inconsistencies.
- Responsible for the drafting, confirmation and the checking of the material take-off in the event that those drawings have to be modified.
- With the professional capability of drawing interpretation, progress appraisal, management, etc., and carry out the selection of the foremen.
- The supervisor shall carry out the work for the areas designated Construction Engineer and QC Engineer
- The Painting Technicians shall be responsible for the selection of adequate instruments, equipment, tools, materials, filling-out of the required forms.
- Completion of the work using correct methods under the supervision of the Foremen and Supervisor.
- The safety officer shall work with the supervisor to insure all the personnel involved ware proper PPEs.
- Check the all signs and barrication and monitor the area when the painting work is going on.
Handling & Storage of Painting Materials
All paint materials received only in original packing.
Check the batch number date etc.
Ensure that primer, under coats and final coat as applicable for individual coating systems shall be fully compatible and that the appropriate coatings are obtained from the same manufacturer.
All Paint and Thinners shall be stored in a well-ventilated place at storage temperatures as recommended in the Manufacturer’s data sheet and MSDS.
Coating materials used at construction sites must be covered with appropriate canvas, tarpaulins, or equivalent for a temporary storage.
The max. Storage time for paints shall be as per the manufacturer recommendation.
Touch up material shall be same as or compatible to the shop applied coating.
Touchup Paint Method Statement
Flange mating faces should be masked before any painting operation.
The spool tags should be protected.
Supervisor records the Relative Humidity, Ambient Temperature and Substrate temperature before the start of painting and at every 4 hours of interval.
The Painting QC inspector checks the recorded Relative Humidity are less than 85%, the air and the metal temperature is above 3°C than the Dew Point Temperature.
Volume of thinner shall be limited to the extent specified by the manufacturer’s standard for thinning of paints.
Angle, corners, sharp edges, weld seams, weld joints and damaged area and other surface irregularities shall be stripe coated.
Paints shall not be applied when it is raining.
Pre-Check surface weld spatter/slag/irregularities.
Standard power tool shall be used for preparation & surface cleaning.
Paint shall be applied evenly, to produce smooth coating for the required thickness.
Touch up should be done on each coat before applying the next coat, if any damages or uncoated areas.
First Coat/Primer-Minimum DFT requirement for Support and Tank.
DFT Per Coat (µ) 50 (75)
Number of Coats 1
Application Method Brush/Roller
First Coat/Primer-Minimum DFT requirement for Pipe
DFT Per Coat (µ) 125
Number of Coats 2
Application Method Brush/Roller
Damaged surfaces to be roughened to remove loose coats and corners should be feathered with sand paper for subsequence preparation for coating systems.
Touch up material shall be same as, or compatible to, the shop applied coat.
Touch up should follow the manufacturer’s recommendation.
Issue a written request for inspection 24 Hours in advance for the readiness of Test Inspection to client/consultant QC representative.
Quality & HSE Requirements for Touchup Paint Works
Approved paint manufacture shall be selected.
Appropriate respiratory protection shall be used during hand tool or power to cleaning operation where required.
All necessary tests shall be made for identifying the presence of toxic gases, chemical or explosive mixtures in accordance with applicable standard.
Paints shall be applied using approved techniques relevant to the application requirement, such techniques shall include airless and air pressure spray, and pressure fed roller, roller and brush.
Daily log containing the following data shall be maintained:
- Relative humidity
- Dew point
- Metal temperature
- Paint storage room temperature log
Control the source of ignition in the paint mixing area.
Prevent contact of paint and solvents with eyes and skin.
All waste paint, cleaning solvents, etc. must be properly disposed off at an approved disposal area.
Personnel involve shall wear respirator type mask or cartridge type.
Paint on work at height shall have safe working platform and wear full body harness.
All workforces are provided with the following personal protective equipment:
Fire hazard sign
Dust and cartridge mask
Fabric and rubber gloves