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Hvo PTNG 3

The document outlines the procedures for repairing hot-dip galvanized coatings in accordance with ASTM A780 and emphasizes the preferred repair method. It details the handling requirements for shop coated piping and structural steel, including the use of nylon slings and proper dunnage to prevent damage. Additionally, it specifies inspection and testing protocols for surface cleanliness and contamination before painting, referencing various ISO standards.

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Rajesh Rajesh
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19 views1 page

Hvo PTNG 3

The document outlines the procedures for repairing hot-dip galvanized coatings in accordance with ASTM A780 and emphasizes the preferred repair method. It details the handling requirements for shop coated piping and structural steel, including the use of nylon slings and proper dunnage to prevent damage. Additionally, it specifies inspection and testing protocols for surface cleanliness and contamination before painting, referencing various ISO standards.

Uploaded by

Rajesh Rajesh
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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The repair/touch-up of damaged and uncoated areas of hot-dip galvanized coatings for structural

parts shall be in accordance with ASTM A780. Preferred repair method is reflected in paint system
nº 6 TU (See attachment 1).

9. HANDLING OF SHOP COATED PIPING, EQUIPMENT AND STRUCTURAL


STEEL

9.1 General
All shop coated piping, equipment and steel shall be handled using nylon slings or other approved
lifting methods. Proper dunnage during transport, storage and jobsite erection shall be used to
minimize damage to the coating.
Transport and construction of painted structures shall be carried out only after the drying time
specified by the paint manufacturer has elapsed.

10. INSPECTION AND TESTING

10.1 General
Before painting activities commence, the contractor shall submit an inspection and testing
procedure and to be conducted during preparation and application of the paint system, for
approval by the Principal.
The following coating inspections and tests shall be applied:

10.1.1 (Revision) Surface Contamination


The grade of cleanliness shall be at least Sa2.5 as per ISO 8501.
The surface profile shall be as per attachment 1 and shall be assessed in accordance with ASTM
D4417 or ISO 8503-5.
After blast-cleaning, all dust must be removed using a vacuum cleaner before application of the
paint in order to achieve the maximum dust Rating 1 acceptable for each paint system as per ISO
8502-3. Before painting works commence, checks for the contamination of the surface by salts
shall be carried out (ISO 8502-6 & ISO 8502-9).
The maximum acceptable total water-soluble salts contamination on surfaces before application
blasting shall be 20 mg/m2. Extraction of contaminants from surface shall be done according to
standard ISO 8502-6 and quantitative determination of total water-soluble salts shall be performed
according to standard ISO 8502-9.
See Appendix 5.

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