Steel Pipe Industry of Indonesia

Corrosion that caused by the weather or other factors can be prevented by coating the pipes as protection. There are several methods of coating :

I. GALVANIZING PROCESS

Reasons for applying Hot Dip Galvanizing are as follows:

1.	Extending the age of steel or iron (for example: Coating thickness for 600 gr/m2 is free from maintenance for over 30 year in rural and 15-25 years in urban area.
2.	Coating shall not peeled off easily because it has been united with its base coat so the activities of assembly and transportation will be easier.
3.	Protecting from little scratches, both zinc are cathodic for small area as it closes it self automatically after a while.
4.	Giving a comprehensive protection including sharp indentations, also can be controlled and assembled on location easily.
5.	Simplifies the control of assembly on location because of its flat surface and clean appearance, and easy to find out if the condition does not reached out, for example : spots, etc.

Improvement
The wide consumption of galvanized steel pipe welding on location has increased the demands of locals reparations that has broken by welding.

There are 2 ways to improve : (Conform to the Australian standard 1650 appendix (G))

1.	Using paint coat that contains of large Zn (comform to the Australia standard 2204), including Zinc Galv. No.1; ZRP, 10 in it, etc. Paint coat for maximum thickness 100 micron and if it required the same color for the outest coat, it can be lined with Aluminium paint.
2.	Using stick and powder, for example C I G galvanizing bar, All stage galvover, etc.

Standard we use hot dip galvanizing conform to the standard of SII, British Standard, DIN, ASTM, JIS, Australia and New Zealand.

For example, the Zinc coat thickness according to the Australian Standard AS 1650 are :

PRODUCT	Minimum Coat Thickness Product
PRODUCT	Coat Weight G/M2	Weight Equivalent uM
Steel, thickness > 5 mm Steel, thickness 2 mm < t < 5 mm Steel, thickness < 2 mm Centrifugal Result	600 450 350 300	84 63 49 42

Zinc Coating Standard : JIS H.8641; BS.729; ASTM A 53, A 123
Test Standard : JIS H.0401

Hot Dip Galvanizing process consists of 2 methods:

a. Blow - Off - Modern galvanizing technique using dry method (air blown) - A smooth and uniform Zinc coating - Automatic withdrawing galvanizing equipment that conform to international standard specifications.

b. Batch - Type - Extending age of steel - Hard to be peeled off - Automatically protecting in case of small scratches - Giving a comprehensive protection - More economical

[ Go to PIPE COATING PROCESS ]