Shop-based stainless steel pre-passivation and nitrogen preservation for data center hydronic systems.
Controlled shop environment ensures consistent passivation quality before delivery to site.
Fabrication introduces free iron from welding, grinding, and handling. Shop passivation removes these particles before they become embedded corrosion initiation sites.
Welding heat tint depletes chromium at weld joints. Citric passivation dissolves iron-rich surface layers and restores the protective chromium oxide layer.
Pre-passivated piping enters service with a stable passive layer. First-fill water contacts protected surfaces rather than reactive bare metal. See our flushing process →
Industry-standard passivation using food-grade citric acid.
Optimal concentration range for removing free iron without over-etching the stainless surface.
Elevated temperature application (120–140°F) accelerates iron dissolution and removes welding discoloration.
Copper sulfate spot test verifies passivation success. No blue tint = passivation successful.
Critical steps that maintain passivation integrity through storage and transport.
After rinsing, components dried with oil-free compressed air to prevent hydrocarbon contamination of the passive layer.
Desiccant drying or heat cycling ensures no residual moisture remains to initiate corrosion during storage.
Piping capped and filled with nitrogen to prevent atmospheric oxidation during transport and storage.
The measurable advantages of shop-based passivation over field passivation.
Shop conditions (temperature, humidity, cleanliness) are optimized for passivation chemistry. Field conditions are variable and often unsuitable.
Automated process controls ensure every spool receives identical treatment. Field passivation quality varies with technician skill and site conditions.
Passivation occurs in parallel with on-site construction. When piping arrives, it's ready for flushing—saving weeks in the critical path.
Batch records, test certificates, and traceability documentation support commissioning requirements and warranty obligations.
We provide off-site pre-passivation services for data center projects. Contact us to discuss specifications and scheduling.
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