RELAB SPRAY TECH

RELAB SPRAY TECHhttps://www.relabspray.comRELAB Spray Tech | Applicatons, Industries.enMon, 20 Apr 2026 21:42:19 +0800Low-pressure, Medium-pressure and High-pressurehttps://www.relabspray.com/en/technology/flow-rate-and-spray-angle/low-pressure-medium-pressure-and-high-pressure/https://www.relabspray.com/en/technology/flow-rate-and-spray-angle/low-pressure-medium-pressure-and-high-pressure/185Low-pressure, Medium-pressure and High-pressureRELAB<![CDATA[Low-pressure water misting system, Medium-pressure atomization system, High-pressure fogging system]]><![CDATA[In water mist systems, the industry generally classifies systems into three categories—low-pressure, medium-pressure, and high-pressure—based on operating pressure (MPa).]]>https://www.relabspray.com/files/image/low-pressure,-medium-pressure-and-high-pressure-9507.jpg<![CDATA[<p>In water mist systems, the industry generally classifies systems into three categories—low-pressure, medium-pressure, and high-pressure—based on operating pressure (MPa).</p> <h2>Low-pressure water mist systems: Operating pressure ≤ 1.2 MPa</h2> <p> </p> <ul> <li>Compliant with most international standards, such as NFPA 750, CEN/TS, and China’s Technical Specifications for Fine Water Mist Fire Extinguishing Systems.</li> <li>The system structure is relatively simple, allowing for the use of standard fire-fighting centrifugal pump sets, with piping typically made of austenitic stainless steel.</li> <li>Used in diesel generator rooms, oil-immersed transformers, cable tunnels, and similar locations; features larger droplet sizes, higher water consumption, and more noticeable water staining effects</li> </ul> <p> </p> <h2>Medium-pressure water mist systems: 1.21 MPa < operating pressure < 3.5 MPa (approx. 12.1–3.5 bar)</h2> <p> </p> <ul> <li>The droplet size is finer than that of low-pressure systems, improving cooling and suppression effects, though it still falls short of high-pressure systems.</li> <li>Typically requires a plunger pump; operating and maintenance costs are higher than those of centrifugal pumps, resulting in poorer economic efficiency.</li> <li>Rarely installed as a standalone system in practical applications; some functions can be replaced by water spray or high-pressure fine water mist systems.</li> </ul> <p> </p> <h2>High-pressure water spray systems: Operating pressure ≥ 3.5 MPa</h2> <p> </p> <ul> <li>Capable of producing micron-sized (Dv0.50 ≤ 65 μm) ultra-fine water mist, offering excellent cooling, suffocation, thermal radiation blocking, and electrical insulation properties.</li> <li>Widely used in high-value facilities sensitive to water damage, such as data centers, archives, cultural relic repositories, and ship engine rooms.</li> <li>The system imposes extremely high requirements on water quality, nozzle precision, and pipe pressure resistance, and often employs two-fluid atomization technology or precision ceramic/stainless steel nozzles.</li> </ul> <table> <tbody> <tr> <th>Pressure Rating</th> <th>Operating Pressure Range</th> <th>Features</th> </tr> <tr> <td>Low-pressure System</td> <td><1.2Mpa</td> <td>Conventional fire-fighting centrifugal pumps are sufficient to meet water supply needs; the droplet size is relatively large, and water consumption is high.</td> </tr> <tr> <td>Medium-pressure System</td> <td>1.2Mpa ≤ P < 3.5Mpa</td> <td>Operating between low and high pressure, this system requires a dedicated medium-pressure pump unit; its atomization performance and fire-extinguishing efficiency are superior to those of low-pressure systems.</td> </tr> <tr> <td>High-pressure System</td> <td>P > 3.5 Mpa</td> <td>Requires a high-pressure plunger pump; produces extremely fine droplets (Dv0.99 ≤ 300 μm); offers high cooling and fire suppression efficiency; and significantly reduces water consumption.</td> </tr> </tbody> </table> <p> </p>]]>