Rendering: a run of liquid-cooled racks with couplings visible at the rack faces

120 kW-class · direct-to-chip

Beyond 100 kW racks

Air cooling stops here. Direct-to-chip takes over.

Book a rack-level BOM review

NVL72 per rack · industry-published benchmark 120 kW all direct-to-chip

Air-cooled envelope · industry-published benchmark 8–25 kW per rack

Worst outage > $100k · industry-published benchmark 57% of respondents, 2025

Where air cooling runs out

Five rungs · one limit · one transition

Air-cooled envelope

8–25 kW

per rack, the band air is designed for. industry-published benchmark

Air limit

~30 kW

above this, air cooling is not practical, whatever the aisle is built for. industry-published benchmark

Transition point

66 kW

an intermediate multi-node configuration, still on the liquid side of the line. industry-published benchmark

Top of the ladder

120 kW

fully direct-to-chip liquid cooled, per rack. industry-published benchmark

Installed estate

10–30 kW

still the mainstream density; facilities above 30 kW are rare. That gap is the retrofit question. industry-published benchmark

What a leak costs

Outage cost survey · 2025

57% Worst outage > $100k

Share of respondents reporting a six-figure outage. industry-published benchmark

~1/3 Worst outage > $250k

Roughly one in three, in the same survey. industry-published benchmark

$1M+ Cases on record

Outages above one million dollars are documented, not hypothetical. industry-published benchmark

Dripless couplings and a leak-test discipline are the half of this risk that can be specified on a purchase order.

Rendering: five UQD-series couplings with red and cyan anodised rings and chrome bodies on a neutral grey gradient ground — The colour-marked halfSupply and return, per the marking convention

Rendering: a cold plate on a server tray with its two coupling tails, hoses looping away to a manifold — Where a leak would landCold plate and its two tails

When the rules arrive

Efficiency limits · date · measured band

2026-07-01

PUE ≤ 1.2

Germany: new data centres, from commissioning. industry-published benchmark

EU proposal

1.3 / 1.4

draft limits split by climate, colder member states tighter. industry-published benchmark

Measured

1.02–1.05

PUE band reported for liquid-cooled facilities. That is why liquid is a regulatory answer, not only a thermal one. industry-published benchmark

What that means for the parts

Loop condition · interface · fluid

Rendering: a machined coupling spigot on a brushed stainless rack panel, blue latch levers beside it and a black hose running out of frame

Supply

17–27 °C is the recommended coolant temperature entering the cold plate. industry-published benchmark

Rack density

10–20 kW per rack is the common figure; HPC installations above 50 kW are the upper reference. industry-published benchmark

Interface

UQD panel-mount couplings, UQDB blind-mate couplings and a rack manifold, with port pitch matched to the rack standard. designed to the OCP UQD/UQDB specification

Fluid

Inhibited propylene-glycol loop chemistry of the PG25 class, per the specification's own reference set.

Port pitch

EIA 42U–52U and the ORv3 rack standard are both supported; the pitch changes, the coupling does not.

Rendering: a rack rear with a vertical pipe pair feeding braided hoses to a cold plate — Rack rearPipe pair to the cold plate

Rendering: a quarter-inch socket mounted through a tray backplate, its hose routed away beneath the panel — Tray backplate1/4 in socket through the panel

Rendering: a three-eighth-inch hose pair crossing a tray edge down to two panel-mounted sockets — Tray edge3/8 in pair to two sockets

Rendering: a half-inch coupling pair inline on a rack trunk pipe with an insulated run receding behind it — Trunk1/2 in pair, insulated run behind

What goes into a review

Market access · owner review · clause mapping

UL Some manufacturers of this product class publish a UL listing for the North American market. Market access of that kind is a buyer's entry ticket. in-market

Owner review The pack an owner's engineering reviewer asks for: drawings, test plan and a one-page spec sheet.

Clause map Test reports mapped to specification clauses one by one, rather than a single pass mark. The wording lives on quality.

Preparation is per destination market. A document set that covers one market does not cover the next one.

BOM review

Where does your rack land on this ladder?

Send the rack power per node and the interface you are planning against. Planning is done for 10–20 kW racks with coolant entering at 17–27 °C (industry-published benchmark), and the reply is a BOM review rather than a catalogue page.

Book a rack-level BOM review One business day · English quote + a one-page spec sheet