[Sprinklerforum] Re: Flexible assembly on pump discharge in seismic category D area

[Parsley Consulting]

Craig, Is he seriously worried that a pipe joint, buried underground with either a thrust block, or a mechanical thrust restraint device is going to move up to 8" when pressurized? Flanged joints don't permit that much movement, if any, and the last time I looked closely at NFPA-24 flanged fittings were acceptable. What on Earth is he going on about? Ken Wagoner, SET Parsley Consulting 3002 Younger Drive Harrisonville, Missouri 64701-3909 Phone: (760) 745-6181 Visit the website On 3/10/2026 9:13 AM, Prahl, Craig wrote: Thanks Steve.  This condition is way outside the normal scope of seismic issues we typically deal with inside buildings.    The seismic movement condition the ME is worried about was between the pump building and the underground fire main.  So, traditional seismic assemblies won’t work since this needs to be able to be buried in the dirt.    Craig Prahl | Jacobs | Fire Protection SME – EV, AM, DC, Special Hazards craig.pr...@jacobs.com | www.jacobs.com 1041 East Butler Road   Greenville, South Carolina  29606 CONTACT BY: Phone 1-864-676-5252, Email or MS TEAMS   From: Welsh, Steve <mswe...@burnsmcd.com> Sent: Tuesday, March 10, 2026 9:31 AM To: Mike Watts <mwa...@firetrol.net>; Discussion list on issues relating to automatic fire sprinklers <sprinklerforum@lists.firesprinkler.org> Subject: [EXTERNAL] [Sprinklerforum] Re: Flexible assembly on pump discharge in seismic cat D area   Craig, Not sure if this was your question too. “An approved seismic separation assembly shall be installed where sprinkler piping, regardless of size, crosses building seismic separation joints at ground level and above. ” Normally, Craig,   Not sure if this was your question too. “An approved seismic separation assembly shall be installed where sprinkler piping, regardless of size, crosses building seismic separation joints at ground level and above.” Normally, you do not need a separation at the building foundation slab as the slab moves with the ground. However as you are going through a building exterior wall, the wall could move differently than the ground. Thus, the extra separation is required.   Notes: There are clearance requirements at the foundation slab. There will also be clearance requirements at the exterior wall. You will some type of flexible weather seal.   Steve Welsh, PE  \  Burns & McDonnell Senior Fire Protection Engineer M 410-978-3836    From: Mike Watts <mwa...@firetrol.net> Sent: Monday, March 9, 2026 5:52 PM To: Discussion list on issues relating to automatic fire sprinklers <sprinklerforum@lists.firesprinkler.org> Subject: [Sprinklerforum] Re: Flexible assembly on pump discharge in seismic cat D area   https://www.metraflex.com/products/fire-protection-division/?matchtype=e&network=g&device=c&keyword=metraflex%2520fireloop&campaign=1880371110&adgroup=72795587649&matchtype=&network=g&device=m&keyword=&campaign=1879994101&adgroup=67581073182&gad_source=1&gad_campaignid=1879994101&gclid=Cj0KCQjw37nNBhDkARIsAEBGI8NDEzU6QG8GfbpPNfSPMWigac-U8CJvEPSnVW2RWo1KlqAmv4AklogaAifAEALw_wcB   Mike Watts  RME-G-3218231 Sprinkler Service Manager Firetrol Protection Systems, Inc. 4616 W. Howard Lane, Building 7, Suite 700 Austin, Texas 78728 mwa...@firetrol.net Office 512-687-0115 Cell 512-660-4411 From: Prahl, Craig <craig.pr...@jacobs.com> Sent: Tuesday, February 10, 2026 9:28:47 AM To: Sprinklerforum <sprinklerforum@lists.firesprinkler.org> Subject: [Sprinklerforum] Flexible assembly on pump discharge in seismic cat D area   I have a packaged fire pumphouse, discharge exists horizontally through the wall and then turns down to connect to the underground outside of the bldg. The seismic design category SDC) is “D”. I am being told by the project ME that we should I have a packaged fire pumphouse, discharge exists horizontally through the wall and then turns down to connect to the underground outside of the bldg.   The seismic design category SDC) is “D”.    I am being told by the project ME that we should have a flexible connection on the discharge side outside the bldg. to accommodate the potential of 8-inches of movement between the pumphouse and underground piping system.   I’ve looked around to try and find such an assembly for 8” pipe suitable for an outdoor installation and so far haven’t found such a device.   So, my question for those out there in seismically active areas, is this standard practice and who makes such an assembly?    Craig Prahl | Jacobs | Fire Protection SME – EV, AM, DC, Special Hazards craig.pr...@jacobs.com | www.jacobs.com 1041 East Butler Road   Greenville, South Carolina  29606 CONTACT BY: Phone 1-864-676-5252, Email or MS TEAMS     NOTICE - This communication may contain confidential and privileged information that is for the sole use of the intended recipient. 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