Dry Chemical Systems Extinguishing Effects of Dry Chemical Dry chemical agents extinguish fire to the highest extent by breaking the combustion chain. Minor amounts of cooling, smothering and shielding of radiant heat are also obtained. Various types or dry chemicals are available in the market to suit different kind of applications. Commonly used agents are purple-k, FORAY, Plus fifty, Monnex and others. Typical areas of application: 1. Flare snuffing for LNG/LPG storage tanks, 2. Flammable liquid storage room, 3. Helicopter facilities, 4. Top of refrigerant tanks, 5. Exposed storage tank domes and exposed parts of storage tanks, 6. Liquefied fuel storage/process/ transfer area, 7. Bunkering stations . 30 seconds for flare snuffing system and minimum 45 seconds for deck protection dry chemical systems. Expellant nitrogen gas is used as propellant to deliver the powder at required capacity to the targeted area. For purging of the distribution line (to remove potential residual dry chemical left behind) after system operation, a purge nitrogen cylinder is provided as a part of the system. Semco Maritimes dry chemical system design complies with • NFPA 17: Standard for Dry Chemical Extinguishing Systems • ABS: Guidance notes on firefighting systems • DNV-OS-D301: Fire protection Semco Maritimes dry chemical system design can be customized to suit customer requirements and design standards as well as preferences regarding operation mechanism (remote, local and manual release), material selection, system nozzle layout, space limitations, coating, third party inspection, certification and others as required. System Capacity Based on the area, type and size of hazard area, system capacity is determined with our in-house developed performance calculation tool. The design duration is typically
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