Galvanised pipe is produced by coating steel pipe with zinc using the hot-dip method. The zinc layer protects the pipe against internal and external corrosion.
Thanks to that protection it is the standard material for water installations, fire lines and structural work that stays outdoors.
Technical specifications
| Diameter | 1/2" – 6" (21.3 – 168.3 mm) |
|---|---|
| Wall thickness | 2.00 – 5.00 mm |
| Coating | Hot-dip zinc, min. 55 µm |
| Standard | EN 10255 |
| Length | 6,000 mm |
| Use | Water, fire lines, outdoor installations |
Why coating thickness is critical
The coating is specified as a minimum of 55 µm. That thickness also protects the inner surface of the pipe, delaying corrosion in contact with water.
On thinly coated products the inner surface deteriorates early and the line develops blockage, colour and taste problems. That is why a coating certificate should be requested.
Where it is used
- Drinking and clean water installations
- Fire suppression lines
- Railings and posts exposed outdoors
- Agricultural irrigation lines
Threaded ends and installation
In plumbing work threaded ends speed up installation; connections can be made without welding.
When the pipe is cut, the exposed edge needs protecting; depending on the section size, the gap in the zinc can be the start of corrosion.