Beyond the CDU: The High-Purity Piping That Decides the Life of Liquid Cooling
Compute demand is growing at an exponential pace, from ChatGPT to domestic large models, from autonomous driving to AI inference servers, and data center rack power is climbing from 4 to 6kW to 20kW, 50kW and a future of 100kW and beyond. Air cooling has hit its ceiling, and liquid cooling has turned from an option into a necessity. In the liquid-cooled data center, the CDU (Coolant Distribution Unit) is the key hub connecting IT equipment with the outdoor cold source, and the liquid cooling piping that runs through it, especially high-purity stainless steel tubing, carries the core mission of delivering coolant safely, precisely and leak-free to every chip. That mission is the yardstick by which a CDU liquid cooling manufacturer is judged today.
Three variables are pushing liquid cooling into the mainstream at the same time. Compute density is soaring: GPU and NPU clusters demand more heat rejection than air cooling can ever provide. Under the dual-carbon goals, PUE has become a hard metric, and liquid cooling brings it below 1.1. And domestic substitution is accelerating: Inspur, Huawei and Sugon are ramping liquid cooling server production, and whole-rack delivery is releasing concentrated demand for CDUs and piping at once. Whichever route wins, plate, immersion, cold plate or spray, a data center liquid cooling system always includes the piping loop, which is not conspicuous but decides the safety and life of the whole system.
Liquid cooling piping looks like a simple tube, but it is a precision component defined by cleanliness, pressure and sealing, with a processing bar orders of magnitude above conventional industrial piping. Mainstream materials are 304/316L stainless steel, balancing corrosion resistance, low dissolution and long-term stability, and fittings must meet food or semiconductor grade standards such as ASTM A270 and EN 10357. Inner surfaces must hold Ra of 0.8 μm or better to stop particles, bacteria and clogged cold plate channels. Joints use automatic argon arc or orbital welding with 100% borescope inspection, followed by acid pickling, pure water rinsing, nitrogen purging and cleanroom packaging. Quick connectors such as Figure 280 and CDU-specific clamps must pass pneumatic tests at 1.5 times working pressure and run for years without leakage. Every segment is coded with material batch, welder and inspection time, forming a lifetime archive for the whole CDU system. This is the standard behind reliable AI data center liquid cooling.
None of this can be delivered by an ordinary plumbing workshop. Stable delivery of high density data center cooling requires the equipment, process and quality control trio to pass at the same time. On equipment: laser tube cutting machines, CNC bending machines, automatic welders, borescopes, electropolishing baths, pure water rinse lines and cleanroom packaging stations. On process: standardized operating procedures from cutting, forming, welding, polishing, cleaning and inspection to packaging, with welding current, gas flow and cleaning time recorded digitally at every step. On quality control: incoming spectral verification of material, 100% borescope inspection after welding, a 1.5 times pressure hold of at least 30 minutes before shipping, full appearance and dimension inspection, and batch samples retained for at least three years. Only a complete industrial system like this meets the zero leakage, zero contamination and zero failure requirements of leading customers.
Daliang High-Tech has worked in precision metal piping and liquid cooling tubing for years, and every capability below serves one goal: protecting the data center PUE reduction solution the customer has invested in by keeping the loop clean, tight and low-maintenance. We cover the full size range from DN15 to DN150 with ample 304/316L stock for fast small-batch, multi-variety prototyping. Our one-stop service completes cutting, bending, welding, polishing, cleaning, clean packaging and whole-cabinet prefabrication in-house, so the system arrives ready to install.
Cleanliness is benchmarked to semiconductor rooms: class 100,000 cleanroom packaging with pure water rinsing and nitrogen purging, and quantifiable particle and TOC metrics on every shipment. We also work as an engineering partner with rack makers and CDU vendors, providing 3D piping layout design, pressure drop simulation and on-site assembly guidance, so every GPU cabinet air liquid CDU is matched by a loop that fits, seals and performs from the first day.
Demand is scaling from samples to volume, from single racks to whole facilities, and so is our production: the same process discipline applies whether we ship one prototype or the piping for an entire data center hall, which is exactly what a high density air liquid cooling CDU for AI server system needs from its piping partner.
Liquid cooling is not a concept riding a trend; it is the infrastructure of data centers for the next decade. A good pipe, a good weld and a good archive are the real craft behind it, and that craft lives in manufacturing. Whether you are a rack maker, a CDU vendor or an AI GPU liquid cooling CDU supplier, the reliability of the loop is what the market will remember, and we are ready to build it with you, from the first sample to the whole facility.
Delivering such robust, loop-reliable liquid-cooling infrastructure requires hands-on manufacturing expertise covering every component from pipework through to complete system integration. Where AI goes, cooling must follow. EXTRCOOL's liquid-cooling system brings CDUs, cold plates, manifolds, and pipework together under one roof. You can select from our standard stock or collaborate with us on a tailored design for your exact site. Expect efficient heat rejection, reduced electricity expenses, and a smaller environmental impact—backed by a proven track record at gigawatt-scale data centres around the globe. For critical operations where every second counts, EXTRCOOL is the reliable choice. Browse our product line or request a custom estimate at: https://www.extrcool.com/
