Re: Grooved joints in pump suction main
I have completed hundreds of design, installations, and commissioning with grooved connections on the suction and discharge sides of fire pumps. I never have seen an issue. In fact, I use FxG adapters when I have flanged valves or fittings. I know it probably will not happen during my career, but I have requested the fire pump manufacturers use groove connections at the fire pump suction and discharge connections. *The above is my opinion and has not been processed as a formal interpretation in accordance with the NFPA Regulations Governing Committee Projects. This is provided with the understanding that the AFSA assumes no liability for this opinion or actions taken on it and they are not to be considered the official position of the **AFSA, and/or NFPA or its technical committees.**AFSA cannot provide design or consulting engineering services, and this opinion should therefore not be considered, nor relied upon, as such.* Thanks, John John August Denhardt, PE *Vice President, Engineering and Technical Services* *American Fire Sprinkler Association* m: p: 301-343-1457 214-349-5965 ext 121 w: firesprinkler.org <https://www.facebook.com/firesprinkler.org/> <https://twitter.com/afsa/status/1039528345367732224> <https://www.linkedin.com/company/american-fire-sprinkler-association-afsa-/> <https://www.instagram.com/firesprinklerorg/> *Our members are at the heart of everything we do* *Expand your business with ITM* Professionalize the role of your inspection team with AFSA’s ITM Inspector Development Program. This comprehensive 20-month program provides a blended learning environment teamed with robust curriculum created by top industry leaders. Plus, the first six-months of instruction is online. Now enrolling for Spring 2021 <https://www.firesprinkler.org/itm>. On Tue, Apr 6, 2021 at 5:22 PM Steve Leyton via Sprinklerforum < sprinklerforum@lists.firesprinkler.org> wrote: > Yeah, a sucked rubber was front and center on my worry list. > > -Original Message- > From: Kyle.Montgomery [mailto:kmontgom...@aerofire.com] > Sent: Tuesday, April 06, 2021 2:18 PM > To: sprinklerforum@lists.firesprinkler.org > Cc: Matt Grise ; Steve Leyton < > st...@protectiondesign.com> > Subject: RE: Grooved joints in pump suction main > > We use grooved all the time as well (like hundreds of times) and I'm not > aware of any issue as a result of it. I'm pretty confident that there isn't > a rule against it. I've never seen it suck one of the gaskets through the > pump, if that's what you're concerned about. > > -Kyle M > > -Original Message- > From: Sprinklerforum On > Behalf Of Matt Grise via Sprinklerforum > Sent: Tuesday, April 6, 2021 2:12 PM > To: sprinklerforum@lists.firesprinkler.org > Cc: Matt Grise ; Steve Leyton < > st...@protectiondesign.com> > Subject: [EXTERNAL] RE: Grooved joints in pump suction main > > I am not aware of any prohibitions. We use grooved when we can. For > whatever reason (tradition?) gate valves seem to always be flanged, so we > frequently go flanged just due to availability. > > Matt > > -Original Message- > From: Sprinklerforum On > Behalf Of Steve Leyton via Sprinklerforum > Sent: Tuesday, April 06, 2021 4:09 PM > To: sprinklerforum@lists.firesprinkler.org > Cc: Steve Leyton > Subject: Grooved joints in pump suction main > > We've got this pump house... Took over the design from a civil engineer > and have been in repair mode for a couple weeks. The original concept > used a pre-engineered and all-inclusive pump house but the assembly won't > be accepted by the state agency with jurisdiction because it hasn't passed > the CA seismic testing gauntlet and is thus, not considered a > pre-engineered/pre-approved structure. In the course of revising this to > slab-on-grade building, the pumps go from sitting on frames that are part > of the floor assembly to skid-mounted and we have to furnish housekeeping > pads that are currently really tall. Since pump suction is 10" and we > need a flex coupling near the floor and we have a 10" flanged ell on top of > two flange x groove pieces, the CL of pump suction has risen to about 3'-8" > above the floor requires a 19" concrete pad. If I can attached the > suction main directly to the flex coupling at about 12-14" above the FF, we > can cut nearly a foot out of this housekeeping pad > so the question is: > > Is there any statutory prohibition or observation of good practices that > precludes using grooved fittings and control valves on a pump suction > main? For whatever it's worth, this is low pressure, 2,500 gpm at 54 psi > pumps with high static of about 70 psi. > > Steve Leyton > Protection Design & Consulting > San Diego, CA >
RE: Grooved joints in pump suction main
Yeah, a sucked rubber was front and center on my worry list. -Original Message- From: Kyle.Montgomery [mailto:kmontgom...@aerofire.com] Sent: Tuesday, April 06, 2021 2:18 PM To: sprinklerforum@lists.firesprinkler.org Cc: Matt Grise ; Steve Leyton Subject: RE: Grooved joints in pump suction main We use grooved all the time as well (like hundreds of times) and I'm not aware of any issue as a result of it. I'm pretty confident that there isn't a rule against it. I've never seen it suck one of the gaskets through the pump, if that's what you're concerned about. -Kyle M -Original Message- From: Sprinklerforum On Behalf Of Matt Grise via Sprinklerforum Sent: Tuesday, April 6, 2021 2:12 PM To: sprinklerforum@lists.firesprinkler.org Cc: Matt Grise ; Steve Leyton Subject: [EXTERNAL] RE: Grooved joints in pump suction main I am not aware of any prohibitions. We use grooved when we can. For whatever reason (tradition?) gate valves seem to always be flanged, so we frequently go flanged just due to availability. Matt -Original Message- From: Sprinklerforum On Behalf Of Steve Leyton via Sprinklerforum Sent: Tuesday, April 06, 2021 4:09 PM To: sprinklerforum@lists.firesprinkler.org Cc: Steve Leyton Subject: Grooved joints in pump suction main We've got this pump house... Took over the design from a civil engineer and have been in repair mode for a couple weeks. The original concept used a pre-engineered and all-inclusive pump house but the assembly won't be accepted by the state agency with jurisdiction because it hasn't passed the CA seismic testing gauntlet and is thus, not considered a pre-engineered/pre-approved structure. In the course of revising this to slab-on-grade building, the pumps go from sitting on frames that are part of the floor assembly to skid-mounted and we have to furnish housekeeping pads that are currently really tall. Since pump suction is 10" and we need a flex coupling near the floor and we have a 10" flanged ell on top of two flange x groove pieces, the CL of pump suction has risen to about 3'-8" above the floor requires a 19" concrete pad. If I can attached the suction main directly to the flex coupling at about 12-14" above the FF, we can cut nearly a foot out of this housekeeping pad so the question is: Is there any statutory prohibition or observation of good practices that precludes using grooved fittings and control valves on a pump suction main? For whatever it's worth, this is low pressure, 2,500 gpm at 54 psi pumps with high static of about 70 psi. Steve Leyton Protection Design & Consulting San Diego, CA ___ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org https://urldefense.proofpoint.com/v2/url?u=https-3A__linkprotect.cudasvc.com_url-3Fa-3Dhttp-253a-252f-252flists.firesprinkler.org-252flistinfo.cgi-252fsprinklerforum-2Dfiresprinkler.org-26c-3DE-2C1-2CNnQzlWnaYQG-5F1baqspRog4lZipjuu1qC-2DvaxML0zbRemLsolrdJFec-2DBaDtdud3LEqPl4vB4cPX1BnecsWRo2SV6VuCOY0YZdoos-5FgO38Aa3vxYvQiV-5FrUsl-2Dt5x-26typo-3D1=DwICAg=wn3mZQLIuInh2ClcJ0_DIA=Z_2A85VL7AQzoqudh6uOyS3bn8etxB7nLN8OBJwQd9A=TAQfZmxpLkl8CBa3e20VY8cLmSgn5hFqHpYI_MvWSgA=cYRxJJv80S71XfnU8UEmldZnkm132CKnTGHqQAbneW0= ___ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.firesprinkler.org_listinfo.cgi_sprinklerforum-2Dfiresprinkler.org=DwICAg=wn3mZQLIuInh2ClcJ0_DIA=Z_2A85VL7AQzoqudh6uOyS3bn8etxB7nLN8OBJwQd9A=TAQfZmxpLkl8CBa3e20VY8cLmSgn5hFqHpYI_MvWSgA=GS65IGQx-_dNIu1nxThV1C0g_zMjjs8OLZqNIThPhhQ= ___ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
RE: Grooved joints in pump suction main
We'll stop the D.I. at 6-7" AFF and go to a steel F x G spool with a flexibly coupling to a grooved ell. Probably cut Sch. 40 but not ductile. -Original Message- From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On Behalf Of Tom Duross via Sprinklerforum Sent: Tuesday, April 06, 2021 2:20 PM To: sprinklerforum@lists.firesprinkler.org Cc: Tom Duross Subject: RE: Grooved joints in pump suction main Cut grooved ductile I presume? I've seen that many times. -Original Message- From: Sprinklerforum On Behalf Of Kyle.Montgomery via Sprinklerforum Sent: Tuesday, April 06, 2021 5:18 PM To: sprinklerforum@lists.firesprinkler.org Cc: Kyle.Montgomery ; Matt Grise ; Steve Leyton Subject: RE: Grooved joints in pump suction main We use grooved all the time as well (like hundreds of times) and I'm not aware of any issue as a result of it. I'm pretty confident that there isn't a rule against it. I've never seen it suck one of the gaskets through the pump, if that's what you're concerned about. -Kyle M -Original Message- From: Sprinklerforum On Behalf Of Matt Grise via Sprinklerforum Sent: Tuesday, April 6, 2021 2:12 PM To: sprinklerforum@lists.firesprinkler.org Cc: Matt Grise ; Steve Leyton Subject: [EXTERNAL] RE: Grooved joints in pump suction main I am not aware of any prohibitions. We use grooved when we can. For whatever reason (tradition?) gate valves seem to always be flanged, so we frequently go flanged just due to availability. Matt -Original Message- From: Sprinklerforum On Behalf Of Steve Leyton via Sprinklerforum Sent: Tuesday, April 06, 2021 4:09 PM To: sprinklerforum@lists.firesprinkler.org Cc: Steve Leyton Subject: Grooved joints in pump suction main We've got this pump house... Took over the design from a civil engineer and have been in repair mode for a couple weeks. The original concept used a pre-engineered and all-inclusive pump house but the assembly won't be accepted by the state agency with jurisdiction because it hasn't passed the CA seismic testing gauntlet and is thus, not considered a pre-engineered/pre-approved structure. In the course of revising this to slab-on-grade building, the pumps go from sitting on frames that are part of the floor assembly to skid-mounted and we have to furnish housekeeping pads that are currently really tall. Since pump suction is 10" and we need a flex coupling near the floor and we have a 10" flanged ell on top of two flange x groove pieces, the CL of pump suction has risen to about 3'-8" above the floor requires a 19" concrete pad. If I can attached the suction main directly to the flex coupling at about 12-14" above the FF, we can cut nearly a foot out of this housekeeping pad so the question is: Is there any statutory prohibition or observation of good practices that precludes using grooved fittings and control valves on a pump suction main? For whatever it's worth, this is low pressure, 2,500 gpm at 54 psi pumps with high static of about 70 psi. Steve Leyton Protection Design & Consulting San Diego, CA ___ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org https://urldefense.proofpoint.com/v2/url?u=https-3A__linkprotect.cudasvc.com _url-3Fa-3Dhttp-253a-252f-252flists.firesprinkler.org-252flistinfo.cgi-252fs prinklerforum-2Dfiresprinkler.org-26c-3DE-2C1-2CNnQzlWnaYQG-5F1baqspRog4lZip juu1qC-2DvaxML0zbRemLsolrdJFec-2DBaDtdud3LEqPl4vB4cPX1BnecsWRo2SV6VuCOY0YZdo os-5FgO38Aa3vxYvQiV-5FrUsl-2Dt5x-26typo-3D1=DwICAg=wn3mZQLIuInh2ClcJ0_DI A=Z_2A85VL7AQzoqudh6uOyS3bn8etxB7nLN8OBJwQd9A=TAQfZmxpLkl8CBa3e20VY8cLmS gn5hFqHpYI_MvWSgA=cYRxJJv80S71XfnU8UEmldZnkm132CKnTGHqQAbneW0= ___ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.firesprinkler.org_ listinfo.cgi_sprinklerforum-2Dfiresprinkler.org=DwICAg=wn3mZQLIuInh2ClcJ 0_DIA=Z_2A85VL7AQzoqudh6uOyS3bn8etxB7nLN8OBJwQd9A=TAQfZmxpLkl8CBa3e20VY8 cLmSgn5hFqHpYI_MvWSgA=GS65IGQx-_dNIu1nxThV1C0g_zMjjs8OLZqNIThPhhQ= ___ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org ___ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org ___ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
RE: Grooved joints in pump suction main
Cut grooved ductile I presume? I've seen that many times. -Original Message- From: Sprinklerforum On Behalf Of Kyle.Montgomery via Sprinklerforum Sent: Tuesday, April 06, 2021 5:18 PM To: sprinklerforum@lists.firesprinkler.org Cc: Kyle.Montgomery ; Matt Grise ; Steve Leyton Subject: RE: Grooved joints in pump suction main We use grooved all the time as well (like hundreds of times) and I'm not aware of any issue as a result of it. I'm pretty confident that there isn't a rule against it. I've never seen it suck one of the gaskets through the pump, if that's what you're concerned about. -Kyle M -Original Message- From: Sprinklerforum On Behalf Of Matt Grise via Sprinklerforum Sent: Tuesday, April 6, 2021 2:12 PM To: sprinklerforum@lists.firesprinkler.org Cc: Matt Grise ; Steve Leyton Subject: [EXTERNAL] RE: Grooved joints in pump suction main I am not aware of any prohibitions. We use grooved when we can. For whatever reason (tradition?) gate valves seem to always be flanged, so we frequently go flanged just due to availability. Matt -Original Message- From: Sprinklerforum On Behalf Of Steve Leyton via Sprinklerforum Sent: Tuesday, April 06, 2021 4:09 PM To: sprinklerforum@lists.firesprinkler.org Cc: Steve Leyton Subject: Grooved joints in pump suction main We've got this pump house... Took over the design from a civil engineer and have been in repair mode for a couple weeks. The original concept used a pre-engineered and all-inclusive pump house but the assembly won't be accepted by the state agency with jurisdiction because it hasn't passed the CA seismic testing gauntlet and is thus, not considered a pre-engineered/pre-approved structure. In the course of revising this to slab-on-grade building, the pumps go from sitting on frames that are part of the floor assembly to skid-mounted and we have to furnish housekeeping pads that are currently really tall. Since pump suction is 10" and we need a flex coupling near the floor and we have a 10" flanged ell on top of two flange x groove pieces, the CL of pump suction has risen to about 3'-8" above the floor requires a 19" concrete pad. If I can attached the suction main directly to the flex coupling at about 12-14" above the FF, we can cut nearly a foot out of this housekeeping pad so the question is: Is there any statutory prohibition or observation of good practices that precludes using grooved fittings and control valves on a pump suction main? For whatever it's worth, this is low pressure, 2,500 gpm at 54 psi pumps with high static of about 70 psi. Steve Leyton Protection Design & Consulting San Diego, CA ___ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org https://urldefense.proofpoint.com/v2/url?u=https-3A__linkprotect.cudasvc.com _url-3Fa-3Dhttp-253a-252f-252flists.firesprinkler.org-252flistinfo.cgi-252fs prinklerforum-2Dfiresprinkler.org-26c-3DE-2C1-2CNnQzlWnaYQG-5F1baqspRog4lZip juu1qC-2DvaxML0zbRemLsolrdJFec-2DBaDtdud3LEqPl4vB4cPX1BnecsWRo2SV6VuCOY0YZdo os-5FgO38Aa3vxYvQiV-5FrUsl-2Dt5x-26typo-3D1=DwICAg=wn3mZQLIuInh2ClcJ0_DI A=Z_2A85VL7AQzoqudh6uOyS3bn8etxB7nLN8OBJwQd9A=TAQfZmxpLkl8CBa3e20VY8cLmS gn5hFqHpYI_MvWSgA=cYRxJJv80S71XfnU8UEmldZnkm132CKnTGHqQAbneW0= ___ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.firesprinkler.org_ listinfo.cgi_sprinklerforum-2Dfiresprinkler.org=DwICAg=wn3mZQLIuInh2ClcJ 0_DIA=Z_2A85VL7AQzoqudh6uOyS3bn8etxB7nLN8OBJwQd9A=TAQfZmxpLkl8CBa3e20VY8 cLmSgn5hFqHpYI_MvWSgA=GS65IGQx-_dNIu1nxThV1C0g_zMjjs8OLZqNIThPhhQ= ___ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org ___ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
RE: Grooved joints in pump suction main
We use grooved all the time as well (like hundreds of times) and I'm not aware of any issue as a result of it. I'm pretty confident that there isn't a rule against it. I've never seen it suck one of the gaskets through the pump, if that's what you're concerned about. -Kyle M -Original Message- From: Sprinklerforum On Behalf Of Matt Grise via Sprinklerforum Sent: Tuesday, April 6, 2021 2:12 PM To: sprinklerforum@lists.firesprinkler.org Cc: Matt Grise ; Steve Leyton Subject: [EXTERNAL] RE: Grooved joints in pump suction main I am not aware of any prohibitions. We use grooved when we can. For whatever reason (tradition?) gate valves seem to always be flanged, so we frequently go flanged just due to availability. Matt -Original Message- From: Sprinklerforum On Behalf Of Steve Leyton via Sprinklerforum Sent: Tuesday, April 06, 2021 4:09 PM To: sprinklerforum@lists.firesprinkler.org Cc: Steve Leyton Subject: Grooved joints in pump suction main We've got this pump house... Took over the design from a civil engineer and have been in repair mode for a couple weeks. The original concept used a pre-engineered and all-inclusive pump house but the assembly won't be accepted by the state agency with jurisdiction because it hasn't passed the CA seismic testing gauntlet and is thus, not considered a pre-engineered/pre-approved structure. In the course of revising this to slab-on-grade building, the pumps go from sitting on frames that are part of the floor assembly to skid-mounted and we have to furnish housekeeping pads that are currently really tall. Since pump suction is 10" and we need a flex coupling near the floor and we have a 10" flanged ell on top of two flange x groove pieces, the CL of pump suction has risen to about 3'-8" above the floor requires a 19" concrete pad. If I can attached the suction main directly to the flex coupling at about 12-14" above the FF, we can cut nearly a foot out of this housekeeping pad so the question is: Is there any statutory prohibition or observation of good practices that precludes using grooved fittings and control valves on a pump suction main? For whatever it's worth, this is low pressure, 2,500 gpm at 54 psi pumps with high static of about 70 psi. Steve Leyton Protection Design & Consulting San Diego, CA ___ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org https://urldefense.proofpoint.com/v2/url?u=https-3A__linkprotect.cudasvc.com_url-3Fa-3Dhttp-253a-252f-252flists.firesprinkler.org-252flistinfo.cgi-252fsprinklerforum-2Dfiresprinkler.org-26c-3DE-2C1-2CNnQzlWnaYQG-5F1baqspRog4lZipjuu1qC-2DvaxML0zbRemLsolrdJFec-2DBaDtdud3LEqPl4vB4cPX1BnecsWRo2SV6VuCOY0YZdoos-5FgO38Aa3vxYvQiV-5FrUsl-2Dt5x-26typo-3D1=DwICAg=wn3mZQLIuInh2ClcJ0_DIA=Z_2A85VL7AQzoqudh6uOyS3bn8etxB7nLN8OBJwQd9A=TAQfZmxpLkl8CBa3e20VY8cLmSgn5hFqHpYI_MvWSgA=cYRxJJv80S71XfnU8UEmldZnkm132CKnTGHqQAbneW0= ___ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.firesprinkler.org_listinfo.cgi_sprinklerforum-2Dfiresprinkler.org=DwICAg=wn3mZQLIuInh2ClcJ0_DIA=Z_2A85VL7AQzoqudh6uOyS3bn8etxB7nLN8OBJwQd9A=TAQfZmxpLkl8CBa3e20VY8cLmSgn5hFqHpYI_MvWSgA=GS65IGQx-_dNIu1nxThV1C0g_zMjjs8OLZqNIThPhhQ= ___ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
RE: Grooved joints in pump suction main
I am not aware of any prohibitions. We use grooved when we can. For whatever reason (tradition?) gate valves seem to always be flanged, so we frequently go flanged just due to availability. Matt -Original Message- From: Sprinklerforum On Behalf Of Steve Leyton via Sprinklerforum Sent: Tuesday, April 06, 2021 4:09 PM To: sprinklerforum@lists.firesprinkler.org Cc: Steve Leyton Subject: Grooved joints in pump suction main We've got this pump house... Took over the design from a civil engineer and have been in repair mode for a couple weeks. The original concept used a pre-engineered and all-inclusive pump house but the assembly won't be accepted by the state agency with jurisdiction because it hasn't passed the CA seismic testing gauntlet and is thus, not considered a pre-engineered/pre-approved structure. In the course of revising this to slab-on-grade building, the pumps go from sitting on frames that are part of the floor assembly to skid-mounted and we have to furnish housekeeping pads that are currently really tall. Since pump suction is 10" and we need a flex coupling near the floor and we have a 10" flanged ell on top of two flange x groove pieces, the CL of pump suction has risen to about 3'-8" above the floor requires a 19" concrete pad. If I can attached the suction main directly to the flex coupling at about 12-14" above the FF, we can cut nearly a foot out of this housekeeping pad so the question is: Is there any statutory prohibition or observation of good practices that precludes using grooved fittings and control valves on a pump suction main? For whatever it's worth, this is low pressure, 2,500 gpm at 54 psi pumps with high static of about 70 psi. Steve Leyton Protection Design & Consulting San Diego, CA ___ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org https://linkprotect.cudasvc.com/url?a=http%3a%2f%2flists.firesprinkler.org%2flistinfo.cgi%2fsprinklerforum-firesprinkler.org=E,1,NnQzlWnaYQG_1baqspRog4lZipjuu1qC-vaxML0zbRemLsolrdJFec-BaDtdud3LEqPl4vB4cPX1BnecsWRo2SV6VuCOY0YZdoos_gO38Aa3vxYvQiV_rUsl-t5x=1 ___ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
Grooved joints in pump suction main
We've got this pump house... Took over the design from a civil engineer and have been in repair mode for a couple weeks. The original concept used a pre-engineered and all-inclusive pump house but the assembly won't be accepted by the state agency with jurisdiction because it hasn't passed the CA seismic testing gauntlet and is thus, not considered a pre-engineered/pre-approved structure. In the course of revising this to slab-on-grade building, the pumps go from sitting on frames that are part of the floor assembly to skid-mounted and we have to furnish housekeeping pads that are currently really tall. Since pump suction is 10" and we need a flex coupling near the floor and we have a 10" flanged ell on top of two flange x groove pieces, the CL of pump suction has risen to about 3'-8" above the floor requires a 19" concrete pad. If I can attached the suction main directly to the flex coupling at about 12-14" above the FF, we can cut nearly a foot out of this housekeeping pad so the question is: Is there any statutory prohibition or observation of good practices that precludes using grooved fittings and control valves on a pump suction main? For whatever it's worth, this is low pressure, 2,500 gpm at 54 psi pumps with high static of about 70 psi. Steve Leyton Protection Design & Consulting San Diego, CA ___ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
