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Volume-II of IV - GAIL

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S.<br />

NO.<br />

DESCRIPTION<br />

3.3 COMMERCIAL BLAST<br />

BLAST CLEANING UNIT AT LEAST<br />

TWO—THIRD OF EACH ELEMENT OF<br />

SURFACE AREA IS FREE OF ALL<br />

VISIBLE RESIDUES WITH DESIRED<br />

SURFACE PROFILE.<br />

3.4 BRUSH-OFF BLAST<br />

BLAST CLEANING TO WHITE METAL<br />

CLEANLINESS, REMOVAL OF ALL<br />

VISIBLE RUST, MILL SCALE , PAINT &<br />

FOREIGN MATTER, SURFACE PROFILE<br />

IS NOT SO IMPORTANT.<br />

TABLE-I (for clause 5.0)<br />

SURFACE PREPARATION STANDARDS<br />

VARIOUS INTERNATIONAL STANDARDS<br />

SWEDISH<br />

STANDARD<br />

SIS-05-<br />

5900 1967<br />

SA-2<br />

(EQU<strong>IV</strong>ALENT)<br />

SSPC-SP<br />

USA<br />

SSPC-SP-<br />

6<br />

SA-1 SSPC-SP-<br />

7<br />

NACE<br />

USA<br />

No. 3<br />

No. 4<br />

Page 16 <strong>of</strong> 49<br />

BRITISH<br />

STANDARD<br />

BS-4232:<br />

1967<br />

THIRD<br />

QUALITY<br />

REMARKS<br />

FOR STEEL REQUIRED<br />

TO BE PAINTED WITH<br />

CONVENTIONAL<br />

PAINTS FOR<br />

EXPOSURE TO MILDLY<br />

CORROS<strong>IV</strong>E<br />

ATMOSPHERE FOR<br />

LONGER LIFE OF THE<br />

PAINT SYSTEMS.

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