- Orbital Welding
- Customised Quality Assurance Documentation
- Pressure Test and Passivation
- Engineering & Design Services
- Onsite Installation of Piping Systems
- System Maintanance
- Water Jet Cutting
PRESSURE TEST AND PASSIVATION
We have fully trained and experienced personnel to carryoutpressure testing and chemical cleaning of lines including passivation.
Why is Passivation is Important?
Passivating is typically done to improve corrosion resistance, which is accomplished by the removal of any free iron, or other contaminants that remain on the product-contact surface after fabrication and welding.
Passivation of welded surfaces is important because welding disturbs the passive film on stainless steel, which is responsible for maintaining the corrosion resistance. During welding, the chromium in the weld area is greatly reduced, while the iron content is increased which disturbs the favourable chrome/iron ratio. Passivation restores the natural chrome/iron ratio, and much of the corrosion resistance that is lost by welding.
The passivating Procedure is performed by highly trained personnel with all the necessary safety precautions considered.
Passivating is done according to ASTM 380, which specifies the procedures used to treat the completed system with a citric acid solution or a proprietary mixed chelant formulation.
For more photos of previous projects, please see the gallery