I don’t know if “trying it out” is the ideal option, but if the vents can be adjusted, it might be possible to get the system set up where the water filled the system at a rate that was fast enough, but also had a tolerable water hammer. Or maybe some commercial water hammer arresters could be added?
I don’t know of any non-theoretical calc methods for designing it though. Matt From: Sprinklerforum <[email protected]> On Behalf Of Prahl, Craig/GVL Sent: Tuesday, March 12, 2019 9:13 AM To: [email protected] Subject: RE: Water hammer in Dry or deluge systems Yes, there will be air vents on the system. The FD had concerns on how fast water would get to the valves due to trapped air in the system. Craig Prahl | Jacobs | Group Lead – Fire Protection | 864.676.5252 | [email protected]<mailto:[email protected]> | www.jacobs.com<http://www.jacobs.com/> From: Sprinklerforum <[email protected]<mailto:[email protected]>> On Behalf Of Matt Grise Sent: Tuesday, March 12, 2019 10:11 AM To: [email protected]<mailto:[email protected]> Subject: [EXTERNAL] RE: Water hammer in Dry or deluge systems Is the system vented? I imagine that the ability of the air to escape the system would also affect how fast the water gets moving. Matt From: Sprinklerforum <[email protected]<mailto:[email protected]>> On Behalf Of Prahl, Craig/GVL Sent: Tuesday, March 12, 2019 9:00 AM To: [email protected]<mailto:[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 | [email protected]<mailto:[email protected]> | www.jacobs.com<http://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. ________________________________ 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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