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JOB SPECIFICATION
FOR SURFACE PREPARATION
AND PROTECTIVE COATING
JOB SPECIFICATION No.
A307-000-06-42-PLS-01
Rev.0
PAGE 28 OF 49
TABLE 12.0
EXTERNAL COATING SYSTEMS FOR UNINSULATED CARBON STEEL
AND LOW ALLOY STEEL STORAGE TANKS (For all plant locations, coastal
or inland)
Sl.
No.
12.1
Design Temp.
in o C
All Process Units & Off-sites
Surface
Preparation
(Field)
Primer
Coating system (Field)
(see note 1 below)
Finish Coat
Total
DFT
in
Microns
(min.)
Remarks
All external surfaces of shell, wind girders, appurtenances, roof tops of all above ground tank including top
side of external and internal floating roof and associated external structural works.
12.1.1 -14 to 80
SSPC-SP-10
1coat of F-9 @ 65-75µ
DFT/coat + 1coat of P-6
@ 40µ DFT/ coat ;
2 coats of F-6A @
100µ DFT /coat + 1
coat of F-2 @ 40µ
DFT/ coat;
345-355
F-6 should
be suitable
for
occasional
water
immersion
12.1.2 81 to 150
SSPC-SP-10
1 coat of F-15 primer @
80µ DFT/ coat + 1 coat
of F-15 intermediate
coat @ 80µ DFT/coat ;
1 coat of F-15 finish
coat @80µ DFT/ coat +
1coat of F-2 @ 40µ
DFT/ coat;
280 -
12.1.3 151 to 500 SSPC-SP-10
1coat of F-9 @ 65-75µ
DFT/coat
2 coats of F-12 @20 µ
DFT/ coat
Or
1 coat of F-16 @ 50 µ
DFT / coat
105
or
115
-
12.2 External surfaces of bottom plate (soil side) for all storage tanks.
12.2.1 -14 to 80
12.2.2 81 to 150
SSPC-SP-10
SSPC-SP-10
12.2.3 151 to 550 SSPC-SP-10
1 coat of F-9 @
65-75µ DFT/ coat
1 coat of F-15 primer @
80µ DFT/ coat + 1 coat
of F-15 intermediate
coat @ 80µ DFT/coat ;
(80+80=160)
1 coat of F-16 @ 125 µ
DFT /coat
3 coats of F-7@ 100µ
DFT/coat (3x100=300)
1 coat of F-15 finish
coat @ 80µ DFT/ coat
1 coat of F-16 @ 125 µ
DFT /coat
365-375
F-7 should
be suitable
for
immersion
service of
the
products
given
240 -
250 -
12.3 For underside of the bottom plate (in case tank is not lifted during PWHT) (see Note 2c)
Format No. 8-00-0001-F1 Rev. 0
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