EPDM hose specified for the data center secondary loop
Hose, jumpers and fittings for the secondary loop. No coolant distribution units, no cold plates.
Ask for the specification sheet
200 psi / 1.38 MPa · −40 to +99 °C · UL 94 V-0 cover, the built-to rating.
Open Compute Project floor; 4.0x measured.
No sulphur residues. Zero precipitation is supplier-declared; ISO 1817 is the test.
To 304.8 mm at the 2 in grid main.
Start-stop pulls the loop below zero; braided hose collapses.
Four decisions a hose schedule settles
Compound
Cure system, extraction into glycol, hardness. EPDM 70 Shore A is the standard compound.
Wall construction
Braid layers, bend radius, negative-pressure duty: 24.5 mm to 304.8 mm.
Fitting metallurgy
316 stainless, nickel-plated brass or aluminium against a copper cold plate.
Termination style
Swaged ferrule, constant-tension clamp, or a quick disconnect with no clamp.
A skid builder usually makes all four.
Burst margin is the number that predicts a rupture
| Rule | Value |
|---|---|
| Open Compute Project floor | 3x maximum allowable working pressure |
| Measured, dash −4 | 1.38 MPa working, 5.5 MPa burst, 4.0x |
| No source burst figure | specified at 3x, tested on the datasheet |
| Hydrostatic proof | 1.5x working pressure |
| Method | ASTM D1599-18(2024), deionised water or PG25 |
Heat rejection is sized once from a curve; this joint works every day after. 4.0x keeps it uneventful.
Loop position decides the bore and the construction
| Position | Dash or bore | Construction |
|---|---|---|
| Supply | −4 to −8 | fibre braid |
| Return | −4 to −8 | fibre braid |
| Jumper tail | −4 to −6 | fibre braid, 24.5 mm |
| Manifold drop | −16 to −32 | composite |
| Grid main | 1 in to 2 in | composite, 200 psi |
| Bypass | branch-matched | quick disconnect |
Bend radius: 127.0 mm at 1 in, 304.8 mm at 2 in.
Failure modes a burst test produces
Purge air, pressurise with deionised water or PG25, ramp to rupture.
hose rupture · thread stripping
thread stripping · O-ring deformation · leakage on disconnect · sleeve seizure
weld rupture · deformation
A hose that fails at the ferrule and one that fails at the tube differ.
Standards that govern the hose, the pressure and the joint
| Standard | What it fixes |
|---|---|
| SAE J20 (201503) | hose classes |
| SAE J1037 | coolant resistance |
| ASTM D412 | tensile |
| ASTM D573 | heat ageing |
| ASTM D2000 | callout |
| ISO 1817 | immersion |
| ASTM D1149-18(2025) | ozone cracking |
| ASTM D1599-18(2024) | burst |
| ISO 18869:2017 | leakage |
| IEC 62368-1 | pressure |
| UL 94 · IEC 60695 | vertical burn |
| SAE J514 · SAE J516 | flare |
| ISO 228-1 · MIL-C-27487 · A-A-59326 · ANSI/ASME B16.5 | threads, flanges |
T/CAEE 085-2026 exists; its limits are not published here. Standards are requirements, not approvals held.
One code, one datasheet
EMS-HP-E4-20: dash size and coil length. EMS-HP-J2-06-QD: legs, dash, termination. EMS-HP-FQD-04: type and size.
16 hose codes · 8 bundle codes · 15 fitting codes · 39 datasheets
Every datasheet carries the burst-to-working ratio, proof pressure, compound and cure, braid class, bend radius, termination, weight, coil length and the inspection record.
Ask for the code, get the PDF.
What we do, and what we do not claim
We integrate, inspect, stock and ship; the extrusion line belongs to someone else.
Stated here
UL 94 V-0, 200 psi and −40 to +99 °C are the rating the product is built to; no third-party approval document is held.
Stated on every datasheet
Every coil gets a dimensional check and a 1.5x proof record.
No coolant distribution units, no cold plates