b.
Initial Surface Cleaning: Water blasting shall consist of washing
surfaces to receive paint with a high pressure spray, to remove
loose paint, dirt, and other foreign or deleterious materials.
The working pressure shall be between 2.8 and 4.8 MPa 400 and 700
pounds per square inch gage (psig) at a nozzle operating rate of a
minimum 75 liters per minute (l/min) 20 gallons per minute (g/min.).
Do not flood vents or damage windows and floors. If the pressure
specified will cause damage to existing wood, advise the
Contracting Officer and obtain permission to vary the pressure.
Direct the wash nozzle at the surface at an angle of approximately
75 degrees with the surface and at a distance not greater than
1500 mm 5 feet to apply water pressure required to remove loose
paint, dirt, chalking, and other foreign matter.
c.
Final Surface Cleaning: After allowing the surfaces to dry for a
minimum of 24 hours, remove remaining dirt, splinters, loose
particles, disintegrated and loose paint, grease, oil, and other
foreign matter from the surface.
3.8
APPLICATION
3.8.1
Coating Application
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NOTE: Use the second bracket option when fire
protection sprinkler systems including valve,
piping, conduit, hangers and other miscellaneous
items are to be painted.
**************************************************************************
Painting practices shall comply with applicable federal, state and local
laws enacted to insure compliance with Federal Clean Air Standards. Apply
coating materials in accordance with SSPC PA 1. SSPC PA 1 methods are
applicable to all substrates, except as modified herein.
At the time of application, paint shall show no signs of deterioration.
Uniform suspension of pigments shall be maintained during application.
Unless otherwise specified or recommended by the paint manufacturer, paint
may be applied by brush, roller, or spray. Rollers for applying paints and
enamels shall be of a type designed for the coating to be applied and the
surface to be coated.
Paints, except water-thinned types, shall be applied only to surfaces that
are completely free of moisture as determined by sight or touch.
Thoroughly work coating materials into joints, crevices, and open spaces.
Special attention shall be given to insure that all edges, corners,
crevices, welds, and rivets receive a film thickness equal to that of
adjacent painted surfaces.
Each coat of paint shall be applied so dry film shall be of uniform
thickness and free from runs, drops, ridges, waves, pinholes or other
voids, laps, brush marks, and variations in color, texture, and finish.
Hiding shall be complete.
Touch up damaged coatings before applying subsequent coats.[ Interior areas
shall be broom clean and dust free before and during the application of
SECTION 09900
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