Question 1

What causes leaks in data center process piping systems?

Accepted Answer

Leaks in data center process piping most commonly stem from five root causes: improper joint preparation, material-chemistry mismatches, inadequate pipe support, thermal expansion stress, and undersized distribution headers.

Joint failure is the leading cause. Solvent-cemented PVC and CPVC joints fail when the wrong primer is used, cure time is rushed, wrong cement for size, or installation happens in cold or humid conditions. These joints are also vulnerable in high-glycol service concentrated propylene or ethylene glycol can degrade cement bonds over time. Heat-fused PP-R and PVDF joints, by contrast, create a monolithic connection with no mechanical weak points, making them the preferred choice above active server rows or anywhere a leak would cause downtime.
Material-chemistry mismatches are the second most common cause. PVC is not compatible with high-concentration glycol at elevated temperatures, and standard elastomer seals in valves often fail before the pipe itself does. EPDM seals are generally preferred for propylene glycol service; FKM (Viton) for ethylene glycol. Specifying the wrong seat material in an otherwise correct valve is one of the most overlooked failure points in cooling system design.
Thermal expansion in long straight runs particularly in PP-R and CPVC creates stress at fixed points if expansion loops or offsets aren’t engineered into the layout. This is especially common in large distribution headers added during capacity expansions.
Undersized headers cause over-pressurization events. At 50kW+ rack densities, flow rate requirements increase significantly. Piping sized for traditional 10kW air-cooled racks will experience velocities and pressures that accelerate joint fatigue.
Inadequate pipe support particularly on large-diameter PP-R headers leads to sagging, which stresses joints and misaligns equipment connections over time.

Harrington Process Solutions helps engineering teams avoid these failure modes through material selection support, glycol compatibility review, and actuated valve packages pre-assembled and tested before shipment. For facilities where a leak is unacceptable, Harrington also supplies double containment piping systems with integrated leak detection providing a secondary barrier and real-time alarm capability.

Question 2

What are top liquid cooling piping options for large data centers?

Accepted Answer

Large data centers deploying liquid cooling have four primary thermoplastic piping options, each suited to different zones and performance requirements.

CPVC Schedule 80 is the most widely specified material for primary chilled water distribution. It handles service temperatures up to 80°C, carries higher pressure ratings than standard PVC, and is compatible with propylene and ethylene glycol up to 50% concentration at rated temperatures. It’s solvent-cemented, making installation straightforward for experienced contractors, and it’s the cost-effective default for primary cooling loops in most colocation and enterprise data center builds.
PP-R (Polypropylene Random Copolymer) is growing rapidly in hyperscale deployments. Its key advantage is heat fusion joining — joints are thermally welded to create a monolithic system with no adhesives, no VOCs, and no mechanical weak points. PP-R is rated for 60+ year service life, offers excellent glycol resistance across the full concentration range, and is significantly lighter than metal alternatives. It’s the preferred specification for above-slab primary headers and any run directly above active server rows. Fusion requires a trained operator and dedicated tooling; Harrington offers fusion tool rental to contractors nationwide.
PVDF (Kynar) is specified where deionized water, high-purity coolants, or aggressive chemistry is present — common in life sciences-adjacent data centers and facilities with pharmaceutical co-location tenants. PVDF is also fusion-joined, carries excellent chemical resistance, and is the correct choice for secondary containment carrier pipes where dielectric fluids or specialty coolants are in use. Its higher cost is justified in these specific applications.
PVC Schedule 40/80 remains appropriate for secondary distribution loops, non-critical utility runs, and below-raised-floor distribution in lower-density environments. It is not recommended above active server rows without double containment.

For high-density AI infrastructure at 50kW or above per rack, the correct default shifts to CPVC Sch.80 or PP-R across the board — flow rates, pressures, and temperatures at those densities exceed what standard PVC was designed for.

Harrington Process Solutions supplies all four materials across 85+ branch locations, with specialty group engineers available to support material selection, glycol compatibility review, and system design for both new builds and retrofits.

Question 3

Which process piping systems are proven for mission-critical cooling?

Accepted Answer

In mission-critical liquid cooling environments, the most proven piping systems share three characteristics: fusion-joined or mechanically verified connections, material-chemistry validation for the specific coolant in service, and integrated valve automation for zone isolation and leak response.

Heat-fused PP-R systems have become the benchmark for mission-critical primary distribution. With no adhesive joints, no VOCs, and a welded connection stronger than the pipe wall itself, PP-R eliminates the most common leak initiation point in thermoplastic systems. It’s specified by hyperscale operators for primary cooling headers, CDU supply and return lines, and any run where a leak would trigger a service event. Its service life and full glycol compatibility make it the lowest long-term risk option.
CPVC Sch.80 systems are the proven standard in colocation and enterprise data centers — millions of square feet of data hall are currently cooled with CPVC primary loops. Properly cemented and installed to manufacturer specifications, CPVC is a reliable, cost-effective solution. It becomes the default when construction schedules, contractor familiarity, or budget constraints make PP-R fusion less practical.
Double containment piping systems — a carrier pipe inside a containment pipe with continuous leak detection in the annular space — are increasingly specified for any run directly above active server rows, under-floor distribution in high-density zones, and CDU connection points. When a breach occurs in the carrier pipe, fluid is captured before it reaches IT equipment, and an alarm signal is sent to the BMS. These systems are available in PVC/PVC, PVC/CPVC, PVC/FRP, CPVC/CPVC, and PVDF carrier configurations.
Actuated valve packages — automated isolation valves on every CDU feed and zone branch — are the operational backbone of a mission-critical liquid cooling system. They enable maintenance isolation without full-system shutdown, provide automatic shutoff on a leak detection signal, and support N+1 failover schemes for redundant CDU configurations. Electric actuators with position feedback and BACnet or Modbus integration are standard in tier 3 and tier 4 facilities.

Harrington Process Solutions supplies all components of a proven mission-critical cooling system: PP-R and CPVC pipe and fittings, double containment systems, pre-assembled actuated valve packages, and facility-loop instrumentation from a single source with engineering support and 90+ stocking locations.

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