Yes this, I was not thinking of a system with a pump on site.
Thanks Brett Peters General Manager Installation & Design Proudline Fire Protection Services Ltd. [email protected] 780 490 7602 office ext 202 780 490 7605 fax 780 777 0568 cell 780 718 2676 24h Visit us at www.proudline.ca On Thu, Nov 20, 2025 at 9:30 AM Spencer Tomlinson <[email protected]> wrote: > As an FPE using a particular hydraulic calculation software – if there is > a pump on site, that is why you’re seeing the negative pressure. The > software will publish that on the information sheet – however the real > pressure required is shown on the graphical display. This would mean > you’re 32 psi away from needing the pump – i.e., city supply will feed this > particular design area without needing pump help – if a pump being present > is the case…. > > > > *Spencer Tomlinson, PE* > > Owner, Fire Protection Engineer > > > > [image: red logo] > > Cell: 620-955-7293 > > > > *From:* Brett Peters <[email protected]> > *Sent:* Thursday, November 20, 2025 10:25 AM > *To:* Discussion list on issues relating to automatic fire sprinklers < > [email protected]> > *Subject:* [Sprinklerforum] Re: Hydraulic data plate. > > > > Honestly, I would say a FPE who's competency may be in question performed > a calculation that doesn't work and an installer who's competency may > also be in question just installed it and put the information on the > hydraulic plate. > > I have come across similar issues before in performing tenant work in a > building and have had to show the owner that the tenant system doesn't work > because the base building never did work but the original installer and FPE > got away with it somehow. (unfortunately there are some AHJ's who don't > actually look or know what to look for when reviewing sprinkler drawings > and calcs, they rely too heavily on the FPE being competent) > > > > > > > > > > Thanks > > > > Brett Peters > > General Manager Installation & Design > > Proudline Fire Protection Services Ltd. > > [email protected] > > 780 490 7602 office ext 202 > > 780 490 7605 fax > > 780 777 0568 cell > > 780 718 2676 24h > > Visit us at www.proudline.ca > <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.proudline.ca_&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=SMKi3MpB_L04QTNOI8wsXTbQAi8Ov0kr5kJ9QWv4K58&m=iY480h8Fmn62XdReaf00qpx_5UYadu9hD-qJwlhE9EsxLTlG6tjpEw_a1ahB73Mr&s=QIlST71tlcDfa93eFdL8aTFTwmEuHDra4sgYDzVYfpg&e=> > > > > > > On Thu, Nov 20, 2025 at 9:15 AM Joseph Zachary McTamney < > [email protected]> wrote: > > Hey everyone. I was looking over a hydraulic calculation plate, and the > information is 435sqft, when supplied with water at the rate of 86.3GPM, at > -32.0psi at the base of the riser. My question is "How can the supply > pressure be -32.0psi?" Please explain and help me understand. > > > > Thank you. > > > > Get Outlook for iOS > <https://urldefense.proofpoint.com/v2/url?u=https-3A__aka.ms_o0ukef&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=SMKi3MpB_L04QTNOI8wsXTbQAi8Ov0kr5kJ9QWv4K58&m=iY480h8Fmn62XdReaf00qpx_5UYadu9hD-qJwlhE9EsxLTlG6tjpEw_a1ahB73Mr&s=eSifXsTknQYJA7Sg_v4obg5fNb61FVPdGgndsB70jx4&e=> > > > _________________________________________________________ > SprinklerForum mailing list: > https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org > <https://urldefense.proofpoint.com/v2/url?u=https-3A__lists.firesprinkler.org_list_sprinklerforum.lists.firesprinkler.org&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=SMKi3MpB_L04QTNOI8wsXTbQAi8Ov0kr5kJ9QWv4K58&m=iY480h8Fmn62XdReaf00qpx_5UYadu9hD-qJwlhE9EsxLTlG6tjpEw_a1ahB73Mr&s=F7PVLn481m31RZArzGeuP4lH4L3IHoY_Nt1youqViN0&e=> > To unsubscribe send an email to > [email protected] > > > _________________________________________________________ > SprinklerForum mailing list: > https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org > To unsubscribe send an email to > [email protected] >
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