Derouging and re-passivation on a compressed outage
Condition assessment, compatible chemistry, removal, rinse and re-passivation executed inside the outage window with verification records.
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Passivation for Liquid-Cooled Data Centers
Technology cooling systems, CDU circuits and direct-to-chip loops increasingly run stainless piping with high-purity, low-conductivity coolant. Cleansol passivates and cleans those systems, and documents the work to a standard built in regulated facilities.
Stainless passivation and specialty cleaning for mission-critical cooling systems.
In-system passivation, after cleaning, before fill
Prefabricated skid and module cleaning
Mobilized nationally from Garner, NC
Why Now
High-density compute changed the metallurgy
Air-cooled halls ran carbon steel chilled water. Liquid-cooled halls add stainless technology cooling loops, coolant distribution units and direct-to-chip circuits carrying high-purity, low-conductivity fluid, because corrosion products in those loops end up at the chip.
That makes surface condition a commissioning issue. Free iron, weld heat tint and fabrication contamination compromise the passive layer stainless depends on, and they surface as water-quality findings at exactly the wrong point in the schedule.
Cleansol has performed this metallurgy work in regulated pharmaceutical and biotech facilities since 2016. The systems are new to the data hall. The work is not new to us.
Systems Covered
- Stainless technology cooling and facility water loops
- CDU and direct-to-chip circuits, per OEM requirements
- Prefabricated cooling skids and modules
- Stainless components, coils, vessels and equipment
Where the Work Happens
- At the fabrication shop, before skids and modules ship
- On delivery, before installation
- In-system, after cleaning and before fill
- In operating facilities during planned outage windows
Scope Honesty
When passivation is required, and when it is not
A vendor that tells you when you do not need a service is a vendor you can put in front of your commissioning authority. Passivation becomes relevant when:
- The wetted metallurgy is stainless and the specification calls for it
- Fabrication introduced free iron, embedded iron, weld heat tint or grinding contamination
- The loop carries high-purity or low-conductivity coolant where corrosion products are unacceptable
- The equipment manufacturer requires it as a warranty condition
- An owner or engineer specifies it
And When It Is Not
On a conventional carbon steel chilled water loop, passivation is generally not applicable, and we will tell you so. That loop needs a properly planned flush, which is a different discipline. Send the metallurgy and the spec section, and we will tell you whether passivation is required.
One Project, Two Disciplines
The hydronic side and the hygienic side
Data center cooling splits into two scopes with different rules. Both are delivered by the same organization, the same crews and the same documentation standard, so the mechanical contractor coordinates one subcontractor, not two.
Hydronic side / Cleanhydronics
Flushing, filtration and measured verification
Chilled water and heating water flushing, chemical cleaning, temporary pumping and filtration, live velocity verification, and glycol and heat-transfer-fluid filling when the specification calls for a fluid other than water.
Hygienic side / Cleansol
Passivation and specialty cleaning
Stainless system passivation, high-purity loop cleaning, prefabricated skid and module cleaning, component and equipment cleaning, derouging and remediation.
The Flush Is Not the Finish
Some data center loops are filled with glycol or a specified heat-transfer fluid rather than water. Fluid selection belongs to the engineer, the equipment manufacturer and the fluid manufacturer. Cleanhydronics executes the manufacturer's procedure when a product such as DOWTHERM or THERMINOL is specified: filling, charging, circulating, concentration verification, sampling support and turnover records. The crew that flushes the system is the crew that fills it, so the flush and the fill run as one scope under one subcontract. Fluid filling detail at Cleanhydronics.
Turnover That Survives Review
Pharma-grade records, applied to a cooling loop
Mission-critical commissioning teams ask for the same thing regulated quality teams ask for: the approved procedure, the operating records, the verification results and the deviations, assembled in a package that does not come back with questions.
That documentation discipline is where Cleansol grew up. CLEANDOC contents are defined before execution and delivered in your closeout format. Per our confidentiality practice, customer-facing certificates carry process attestations rather than chemistry names, concentrations or temperatures.
CLEANDOC / Data center scope. Sample index
- Approved procedures and project scope
- Metallurgy and specification basis
- Chemical records and safety data
- Operating logs and monitored variables
- Verification results and process attestations
- Deviations and resolutions
- Completion and acceptance records
Representative Work
Anonymized, within NDA limits
Much of our work is performed under confidentiality agreements. We do not publish client names. During prequalification we can provide relevant experience, redacted work samples and references where authorized.
Where We Work
Based in Garner, NC. Mobilized nationally for qualified project scopes, with active pursuit in the Southeast, Mid-Atlantic and Texas markets. Prefabricated skid and module cleaning can be performed at the fabricator before shipment, which removes site geography from that scope entirely.
- Coordination with GC, mechanical contractor, fabricator, OEM and commissioning authority
- Site safety, screening and access requirements handled during planning
- Drawings and specifications handled under NDA
Next Step
Stainless in your cooling scope?
Send the metallurgy, the specification section and the schedule window. We will tell you whether passivation is required, and if it is not, we will say that too.
We review project inquiries promptly and follow up as quickly as your project timeline allows.