When looking into HFC-227ea gas fire suppression systems, many customers ask why S-TEC VINA chooses a minimum nitrogen super-pressurization of 42 bar rather than the 25 bar used by some suppliers on the market.
Under TCVN 7161-9, HFC-227ea systems can be designed at 25 bar, 42 bar or 50 bar. However, each configuration suits different operating conditions. At S-TEC VINA, the choice of a 42 bar minimum is based on field experience and on optimising system performance.
First, 42 bar gives more design flexibility, especially in the distance from the cylinders to the nozzles. Higher pressure pushes the agent further, reducing constraints on equipment layout – particularly in large buildings or complex pipe networks. A 25 bar system can still work, but its pipe-run distance and agent distribution range are significantly limited.
In addition, 42 bar plays an important role in meeting the discharge time required by the standard. A gas fire suppression system must not only discharge the agent, but discharge enough of it, fast enough, within the specified time. Higher pressure keeps the discharge stable throughout, so the agent reaches the design concentration for effective extinguishment.
Another important factor is product quality and durability. S-TEC VINA uses seamless (one-piece) cylinders that withstand high pressure, resist impact well and remain stable over a long service life. Choosing 42 bar is not only about technical performance; it also demonstrates the pressure rating and reliability of the product – a clear advantage over low-cost welded cylinders on the market.
Even with seamless cylinders, S-TEC VINA keeps costs competitive thanks to its scale and supply chain. With high production volumes, manufacturing costs are well controlled, so the price is not much higher than products using welded cylinders. More importantly, this choice minimises future costs such as maintenance, warranty claims and technical risks, optimising the total cost over the system’s life cycle.
Choosing 42 bar is not about raising the product’s price; it is a balanced solution between operating performance, stability and long-term cost. It is also how S-TEC VINA aims to supply gas fire suppression systems that not only comply with the standards but also suit real-world use on site.
If you are looking for the right configuration for your gas fire suppression system, leave a comment or contact S-TEC VINA for detailed technical advice.
S-TEC VINA – Vietnam’s leading manufacturer of gas fire suppression systems
Factory address: Lot CN03, Dong Van IV Industrial Park, Le Ho Ward, Ninh Binh Province
Representative office: Tower C5, D’Capitale, 224 Tran Duy Hung Street, Yen Hoa Ward, Hanoi
Hotline: 0386 119 114
Email: info@stecvina.com
Website: https://stecvina.com/
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