Volume-II of IV - GAIL

TABLE 13.0 : COATING SYSTEM FOR EXTERNAL SIDE OF UNDERGROUND CARBON STEEL PLANT
PIPING AND TANKS
S. NO. DESIGN TEMPERATURE SURFACE PREPARATION
PAINT SYSTEM
IN °C
PRIMER FINISH PAINT
13.1 CARBON STEEL PLANT PIPING (UNDERGROUND)
13.1.1 YARD COATING
13.1.1.1 25 TO 60 SSPC-SP-10 1 COAT OF 4mm THICK COALTAR
SYNTHETIC FAST COATING WRAPPING
DRYING PRIMER AS PER AWWA-C-203
TYPE-B AS PER IN 2 LAYER OF EACH
AWWA-C-203 (1991) 2mm THICKNESS
13.1.2 OVER THE DITCH COATING
13.1.2.1 25 Tto 60 SSPC-SP-10 1 COAT OF 2 LAYERS OF 4 mm
SYNTHETIC FAST COALTAR BASED
DRYING PRIMER TAPE COATING AS
TYPE-B AS PER PER AWWA-C-203 &
AWWA-C-203 (1991) AS PER SMMS EIL
SPEC. 6-06-203-REV.2
13.2 CARBON STEEL PLANT PIPING (UNDERGROUND)
13.2.1 61 TO 400 SSPC-SP-10 1 COAT OF F-9 @
65-75µ DFT/ COAT
NONE 65-75
13.3 EXTERNAL SIDE OF UNINSULATED UNDERGROUND STORAGE TANKS:
13.3.1 40 TO 80 SSPC-SP-10 1 COAT OF F-9 @ 3 COATS OF F-7 @ 365
65-75µ DFT/ COAT 100µ DFT/ COAT
3 X 100 = 300
13.3.2 -90 TO –41
SSPC-SP-10 1 COAT OF F-9 @ NONE
65-75
81 TO 400° c
65-75µ DFT/ COAT
1 COAT OF
AMERCOAT 738 @
250µ DFT/ COAT
NONE
250
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TOTAL DFT IN
MICRONS (MIN.)
REMARKS
4mm CTE coating shall
confirm to 120/ 5 as
per BS: 4164