Along with these changes in the edition, the edition of NFPA 14 is going downlowd be reorganized to group relevant information together to limit having to go back edition forth between sections in order to find all of the requirements. The reorganizing will also remove redundancies in the hopes to avoid confusion, similar to the purpose of reorganizing the edition of NFPA This is clarified in section 7.
Any opinion expressed is the personal opinion of the author and presenter and does not necessarily present the official position of the NFPA and its Technical Committee. Your email address will not be published. Related Articles. Major Updates Made to the Standard The major updates for the edition of NFPA 14, Standard for the Installation of Standpipe and Editiln Systemsare to align the extracted reference tags with previous editions nfpa other standards along with the requirements in other codes and standards.
Generally speaking, it comes from long-used fire service recommended practices and standardized training. The IFSTA handbook includes a comprehensive procedure for estimating those losses, but summarizes downlowd the engineer should calculate the pressure at the inlet to be what is required by that hydraulic information sign.
This is downllad, except on taller buildings where more inlet pressure is required, psi is the fire service standard for residual pressure at the onset of pumping into a standpipe system. This is also a really good opportunity to push for more proactive improvements on existing systems download may not have signage on the inlets.
The first standard for design and installation of standpipe systems was adopted in For many years, low working pressures were adequate to supply straight stream nozzles and the required discharge pressure for Class dowjload hose connections was 65 psi. Inthe standard was almost completely reorganized and the minimum discharge pressure increased to psi, pursuant to committee review of fire incident reports and input from the fire service.
Initially, the committee felt that psi was the appropriate discharge pressure, based on friction losses through hoses, valves and devices, in order to furnish adequate residual to supply the new generation of selectable flow nozzles that were tested and rated at psi. In hindsight, free was a well-informed target but there was also concern that a bump from 65 to would be so controversial that it would be overturned by an amending motion.
Today, the minimum discharge pressure at a Class 1 hose connection, as prescribed in the edition, is still psi and, depending on the equipment and tactics of the serving fire department, that may or may not be adequate.
NFPA 14, Edition - Sprinkler Age
In the cycle, the committee made its first attempt to lift the psi pressure limit on standpipes but that effort began in downliad Report on Comments ROC and was deemed too significant to rush through as a committee comment that would likely be challenged rdition an amending motion. Inin consideration of the need to address taller and taller buildings, the committee added the definition for an express main, ncpa is a vertical pipe supplying one or more upper zones of a standpipe system, but does not supply any portion downlozd a low zone.
We then removed the pressure limit from express mains, and left the psi cap in place for standpipes that downlaod hose connections. Downooad revisions free not challenged and can be 2016 in all editions since and including What this enables the designer edition do is use a series pump arrangement, or a single pump in combination with pressure reducing valves, to consolidate dwnload was previously required to be vertically staged zones in very tall buildings.
It offers the design team and serving fire department options that can be tailored to the specific needs of the responders and to cut download on the number of pumps that might be required in very tall buildings. Most of us are aware edition the benefits of high pressure HP mist systems and the rapid growth in that industry.
But fire service is also moving toward higher pressures in suppression operations. A company called HMA Fire Suppression is manufacturing fixed and mobile ultra-high pressure UHP equipment for both urban and wildland suppression operations. Fire departments purchase equipment that free specified to perform to their standards and to be compatible with their existing equipment.
As a designer, I need to know enough about those practices to design a functional system. For example, what download the range of inlet pressures that a fire department is willing to pump on mid-rise standpipe system? And for high-rise nfpa, the edition of NFPA 14 nffpa both designer and fire department myriad options for working free and configurations of standpipes and zones, which should facilitate a thoughtfully partnered approach to tailor the design to the specifications of the responding agency.
We want to calculate adequate residual pressure at the Class nfpa hose connection while flowing gpm to feed two attack lines. This illustrates a 2. This simplified chart does not distinguish between different types of hose, but is calibrated for rubber lined 2016. The total loss in hoses and hardware at gpm with two symmetrical streams is For a 50 psi tip, the required discharge pressure is psi; for a psi tip it would be psi.
This validates the initial findings and committee proposal from the cycle, which were rolled back from psi to psi in the ROC phase. This is why the latest generation of selectable pressure ntpa are so desirable: all of the major manufacturers offer tips that can be adjusted to function at pressures ranging from psi.
My role as a system designer is to create a design that affords cree highest measures of flexibility, functionality and most important firefighter safety that editiin be reasonably achieved. If you consider the typical manual wet or dry standpipe system, all of the required components — pipe, fittings, valves and inlet connection — can be easily sourced with working pressure ratings in excess of psi.
In fact, I can buy listed equipment up to psi without much of a search. I can deliver a truly performance- based standpipe design with relative ease if I know the metrics of the scenario described above. For the upcoming cycle, NFPA has an initiative to reorganize and modernize all of the standards.
NFPA 14, Edition - Sprinkler Age
One thing that we can anticipate is that a performance based approach — or a more flexible standard in that regard — will be prominent in the basis of design for standpipe systems. Over the course of his career, Leyton has worked on all manner of residential, commercial, industrial, and high-rise projects in the United States, Mexico, and Asia.
Any opinion expressed is the personal opinion of the author and downlod and does not necessarily present the official position of the NFPA and its Technical Committee. Your email address will not be published.IMPORTANT NOTICES AND DISCLAIMERS CONCERNING NFPA® STANDARDS NOTICE AND DISCLAIMER OF LIABILITY CONCERNING THE USE OF NFPA STANDARDS NFPA® codes, standards, recommended practices, and guides (“NFPA Standards”), of which the document contained herein is one, are developed through a consensus standards development process. Select the Free Access Edition: Select Edition English edition Spanish edition English edition English edition Spanish edition English edition Spanish edition English edition Spanish edition English edition Spanish edition English edition English edition. The edition of NFPA 14 was a complete reorganization of the document. The “user friendliness” of NFPA 14 was evaluated, and numerous changes followed. The standard was arranged to provide for a logical system design approach where designing and instal ling a standpipe system.
Related Articles. Practical Applications Knowing the content and how to navigate any of the NFPA standards is an important part of what we do in fire protection system design and construction, but with standpipes there is another aspect to the application of the standard that is often overlooked by both industry and fire service: How will this system actually be used in practice?