Brush Application Specifications
This specification covers the external surface preparation and coating of pipeline applications such as weld joints, special pipe sections, fittings and fabrication.
Material and Storage
Material shall be Denso Protal 7200 coating system as manufactured by Denso North America, 9747 Whithorn Drive, Houston, TX 77095 (Tel) 281-821-3355 (Fax) 281-821-0304 or 90 Ironside Crescent Unit 12, Toronto, Ontario, Canada M1X1M3 (Tel) 416-291-3435 (Fax) 416-291-0898. E-mail: email@example.com.
Material shall meet the physical properties of the attached product data sheet.
Storage: Material shall be stored in a warm, dry place between 40°F (4°C) to 105°F (41°C). Care shall be taken to insure the material is stored up right (arrows on boxes facing up). Note: If the material is kept cold, it will become very viscous. Do not allow material to freeze.
All surfaces to be coated shall be grit blasted to a near-white finish (SSPC SP-10, NACE No. 2 or Sa 2 1/2). Note: Near-white finish is interpreted to mean that all metal surfaces shall be blast cleaned to remove all dirt, mill scale, rust, corrosion products, oxides, paint and other foreign matter. Very light shado , very light streaks or slight discolorations shall be acceptable; howeve , at least 95% of the surface shall have the uniform gray appearance of a white metal blast-cleaned surface as defined by Swedish Pictorial Surface Preparation Standard Sa 2 1/2 or SSPC VIS-1.
Edges of the existing coating shall be roughened by power brushing or by sweep blasting the coating for a distance of 1" (25 mm) minimum.
The Contractor shall check the surface profile depth by using a suitable surface profile gauge (Press-O-Film Gauge or equal).
Metal areas that develop flash rust due to exposure to rain or moisture shall be given a sweep blast to return them to their originally blasted condition.
For mixing, use strong wooden stir sticks or power drills with appropiate mixing paddle.
For application, use 4" wide brushes, Denso applicator pads or Protal 9" roller.
Wet film thickness gauges.
All contaminants shall be removed from the steel surface to be coated. Oil and grease should be removed in accordance with SSPC SP-1 using non-oily solvent cleaner (i.e., xylene, MEK, ethanol, etc.).
Material for abrasive cleaning shall be the appropriate blend of grit to produce an angular surface profile of
- 5 mils (0.063 - 0.125 mm).
The surface shall have no condensation, precipitation or any other forms of contamination on the blasted surface prior to coating.
The substrate temperature range for application of Protal is 50°F (10°C) to 212°F (100°C). The substrate temperature must be a minimum of 5°F (3°C) above the dew point temperature before proceeding with the coating operation. Ambient temperature may be lower than 50°F (10°C) if the substrate is heated. Preheating may be accomplished with a propane torch or induction coil prior to abrasive blasting.
Protal shall be applied to the specified Dry Film Thickness (DFT) using a brush, Denso applicator pad or roller. Wet film measurements shall be performed to ensure close adherence to the thickness specification.
Mixing: Make sure the part A (Resin) and Part B (Hard- ener) components match in both material and size as specified on the containers. Mix the B component first, independent of the resin. Pour the contents into the part A (Resin) component. Mix at a slow speed so as not to