I assume that the highest point of the riser will have a large bore air release valve, so the Fire Service don’t get a large slug of air when they open the hose nozzle.
If you use a “diaphragm” deluge valve such as the TYCO DV-5 or Clayton, Bermad, etc the opening speed is not as quick and you can fit a pilot orifice to control speed of opening. This is much smoother than the older latched deluge valve. Cheers, Russell Gregory, Christchurch, New Zealand From: Sprinklerforum [mailto:[email protected]] On Behalf Of Prahl, Craig/GVL Sent: Wednesday, 13 March 2019 3:00 AM To: [email protected] Subject: Water hammer in Dry or deluge systems So, I’ve got an FPE and ME questioning about water hammer in a deluge system. We have a unique installation where we have two levels of hose connections (one array at 12 ft AFF and one at 60 ft AFF) for manual firefighting in an unconditioned assembly building which is 145 ft high. Due to the non-heated condition, one proposed concept for a semi-automatic system is to use an electric release deluge valve to charge the system from manual pull stations. Flow rate will be 1,000 gpm at somewhere near 150ish psi though 600-800 ft of pipe inside the bldg. The FPE and ME are concerned with water hammer in the piping when the deluge valve opens based on how fast the valve opens. Has anyone dealt with or had to provide calcs for this? NFPA 13, 14, etc. are fairly silent on the issue. Is it even an issue? I’ve never had this brought up before on an interior system. Anyone have any data on how fast a solenoid operated deluge valve opens? Craig Prahl | Jacobs | Group Lead – Fire Protection | 864.676.5252 | <mailto:[email protected]> [email protected] | <http://www.jacobs.com/> www.jacobs.com _____ NOTICE - This communication may contain confidential and privileged information that is for the sole use of the intended recipient. Any viewing, copying or distribution of, or reliance on this message by unintended recipients is strictly prohibited. If you have received this message in error, please notify us immediately by replying to the message and deleting it from your computer.
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