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JOB SPECIFICATION
FOR SURFACE PREPARATION
AND PROTECTIVE COATING
JOB SPECIFICATION No.
A307-000-06-42-PLS-01
Rev.0
PAGE 23 OF 49
TABLE 7.2
REPAIR OF PRE-ERECTION/PRE-FABRICATION OR SHOP PRIMER
AFTER ERECTION/WELDING
For all un-insulated CS, LTCS & low allow steel items in all Environments
Sl.
No.
Design Temp. in o C
Surface
Preparation
Coating System
Total DFT
in Microns
(min.)
Remarks
7.2.1 -90 to 400 SSPC-SP-3 1 coat of F-9 65-75 See note
below and
7.2.2 401 to 550 SSPC-SP-3 1 coat of F-12 20 clause 5.9.3
NOTES:
1 The application and repair of pre-erection/pre-fabrication or Shop Primer given in above tables
shall be done for all the items to be painted. In case the damages of primer are severe and spread
over large area, entire primer shall be removed by blasting to achieve SSPC-SP-10 and surfaces
to be primed again with F-9 or F-12 as applicable.
TABLE 8.0 COATING SYSTEM FOR GRATINGS, ROLLING & STATIONERY
LADDERS, SPIRAL STAIRWAYS AND HAND RAILS IN ALL LOCATION
Sl.
No.
Design
Temp. in
o C
Coating System
Total DFT
in Microns (min.)
8.1 Up to 60
Hot Dip Galvanizing to 80-85 microns (600-610
gm/m 2 )as per IS 4759, 2629, 4736, 2633 +
1 coat of P-6 @ 40µ DFT/coat + 1 coat of F-2 @ 40
microns DFT/coat
80 microns of finish coat
(excluding the thickness of
galvanizing )
NOTES:
1 No galvanized specimen shall have thickness less than 80 microns.
2 Repair of the damaged area of galvanized coatings due to welding during erection shall be
carried out as per recommended practice IS 11759 using cold galvanizing spray process.
Organic Paint systems are not acceptable for repair.
3 After repair of damaged galvanized coating by Cold Galvanized, the repaired area shall be top
coated with paint system as given in Table 8.0 above (i.e., 1 coat of P-6 @ 40µ DFT/coat + 1
coat of F-2 @ 40µ DFT/coat).
4 Approved Cold Galvanizing manufacturers are ZINGA, LOCKTITE or Z.R.C.
Format No. 8-00-0001-F1 Rev. 0
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