Posted By prads I have a few questions:- Q1. What is the mixing proportion (water + foam concentrate) in case of a foam/water sprinkler system? Q2. What is the pipe color coding of foam/water sprinkler system? Q3. What is the operating pressure of sprinkler systems? Q4. What is the material used as heat sensing element in a heat detector? Any help? Regards, P

Posted By Jeremy Fripp Prads, Yor questions are quite vague and the answers will depend on the associated industry sector. High hazard occupancies, like flammable liquids, tank farms, petro chem, pulp and paper etc require specialist fire protection systems and the answers below may not apply, but for manufacturing typical answers would be as follows Q1. Depends on the type of system, low expansion foam, high expansion foam or AFFF. Most foam systems I have been involved with are AFFF and use a 3% foam additive. Q2. Again depends, on where you are (country) and the applicable jurisdictional code, Red is probably the most common answer. Q3. Again depends on the design of the system, a hydraulically designed sprinkler system will give you a calculated flow and pressure requirement at the base of the riser (sprinkler control valve) to give adequate protection to the building and occupancy. Typically this would be less than 100psi (7.0bar). Standard sprinkler system components typically have an upper working pressure limit of 175psi (12 bar). Q4. Do you mean heat detector or the fusible link in a sprinkler? The fusible link is normally either metal or glass bulb (liquid filled). Common temperature ratings are 68oC, 79oC, 93oC, and 141oC. Hope this helps Jeremy