DATA CENTER LIQUID COOLING HOSE

Three things: the bend radius, the cover and the pressure class. At 1/4 inch this body bends to 24.5 mm and is rated 1.38 MPa (13.8 bar), where a general water hose is bulkier and rated for a workshop, not a cabinet. The cover is also specified V0 flame retardant, which a general water hose is not.

Because the codes are built differently. The 1/4, 5/16 and 3/8 inch codes carry a heavier braid and are rated 1.38 MPa (200 psi) with 5.5 MPa (798 psi) burst; the 1/2 inch code and above are rated 1 MPa (145 psi) with 4.0 MPa (580 psi) burst. Match the code to the circuit, not to the largest number on the page.

1.38 MPa working (13.8 bar, 200 psi) with 5.5 MPa (798 psi) minimum burst. Inner diameter is 6.1 to 7.2 mm, outside diameter 11.6 to 12.6 mm, minimum bend radius 24.5 mm and mass 0.13 kg/m.

1 MPa working (10 bar, 145 psi), on an inner diameter of 25.2 to 26.2 mm and an outside diameter of 33.6 to 34.8 mm. Minimum bend radius is 143 mm and mass is 0.52 kg/m, so a 1 inch drop needs planning inside a cabinet rather than a free hand.

3/4 inch or 1 inch, at 1 MPa (10 bar): 18.8 to 19.6 mm inner diameter for 3/4 inch, with a 113 mm bend radius and 0.35 kg/m. The main run is sized on flow, and 10 bar covers the static head plus pump pressure in a normal loop.

EPDM tube and cover are the standard pairing for water and glycol loops, which is why this body is built that way: 1.38 MPa on the three small codes, 1 MPa from 1/2 inch up, and a 24.5 mm bend at 1/4 inch. Send the glycol concentration and the loop temperature with the enquiry: concentration is a compound question, not a pressure question, and it is confirmed before the order.

Because EPDM does not compress like rubber, and a clamp sized for a thicker wall leaves the joint under-torqued. On a 3/4 inch line at 0.35 kg/m rated 1 MPa the leak finds a rack long before it finds a floor. Inside a cabinet the leak then lands on equipment rather than on a floor. Crimped or correct-size clamped ends, tested before installation, are the only reliable answer.

Ozone and heat age the cover from outside, and a hose lying against a warm manifold ages from both sides. The cover is specified for ozone and abrasion resistance plus V0 flame retardancy, but a 3/4 inch line at 0.35 kg/m left in contact with hot metal is being tested past its duty.

YIBO, in Luohe, Henan, builds 8 codes from 1/4 inch to 1-1/4 inch on one line, with EPDM tube and cover and a V0 flame-retardant cover compound. Assemblies are crimped and tested before dispatch.

Price follows the bore: 0.13 kg/m at 1/4 inch, 0.25 kg/m at 1/2 inch, 0.70 kg/m at 1-1/4 inch. Send bore, length, end type and destination, and a firm figure comes back the same working day.