3.10.3
Holiday Testing
No sooner than 48 hours after application of the topcoat, perform holiday
testing in accordance with the low voltage wet sponge method of NACE RP0188.
Repair holidays per paragraph entitled "Procedure for Holiday and Spot
Repairs of Newly Applied Coating." Do not allow moisture from sponge to
remain on the coated surfaces more than ten minutes. Remove excess
moisture with a clean rag when testing fluoropolyurethane topcoat.
3.10.4
Procedure for Holiday and Spot Repairs of Newly Applied Coating
Repair coating film defects at the earliest practicable time, preferably
before application of the succeeding coat. Observe all requirements for
soluble salts contamination, cleanliness between coats, and application
conditions. Prepare defective area in accordance with SSPC SP 5, and
feather coating as required to leave 100 mm 4 inches of each succeeding
coat feathered and abraded. Do not abrade the fluoropolyurethane topcoat.
Protect adjacent areas from damage and overspray. Remove dust and solvent
wipe the prepared area plus an additional 100 mm 4 inches beyond the
prepared area with clean denatured alcohol. Apply each coat within RECOAT
WINDOW of preceeding coat. Within four hours of preparation, apply primer
to prepared steel and feather onto prepared primer. Apply intermediate
coat to primed area and feather to prepared intermediate area. Apply
topcoat to intermediate coat and feather to prepared topcoat. Apply each
repair coat to approximate thickness of surrounding coating system. If one
percent or more of the total surface area, or more than one spot per 200
square meters 2000 square feet, of the FLOOR area requires repair to any
coat or coats, including feathered areas, the entire FLOOR coating system
shall be removed and reapplied. If 5 percent or more of the total surface
area, or more than one spot per 100 square meters 1000 square feet, of the
CEILING area requires repair to any coat or coats, including feathered
areas, the entire CEILING coating system shall be removed and reapplied.
Repairs on the SHELL are not limited.
3.10.5
Tank Occupancy After Coating Application
Use clean canvas, or other approved, shoe covers when walking on coated
surfaces, regardless of curing time allowed. For heavily trafficked areas,
provide cushioned mats for additional protection.
3.10.6
Extended Cure of Coating System Prior to Immersion Service
Allow a cure time of at least 14 days after the final coating material has
been applied before introducing water or fuel into tank. [Allow a cure
time of 12 days after the final coating material has been applied before
beginning installation of the floating pan.]
3.11
FIELD TESTS AND INSPECTION
For marking of tank surfaces, use chalk for marking bare steel, and water
based markers for marking coated surfaces, and remove marks prior to
coating. Do not use any wax or grease based markers, or any other markers
that leave a residue or stain.
3.11.1
Coating Inspector
**************************************************************************
NOTE: Include requirement for NACE Coating inspector
in Section 01450N QUALITY CONTROL, as a QC
SECTION 09970
Page 31
Previous Page
