NFPA 13R, Standard for the Installation of Sprinkler Systems in Low-Rise Residential Occupancies. Changes to the 2016 edition of NFPA 13R, which are carried into the latest edition, include revisions that change the definition of "sprinkler system" to correlate with NFPA 13 (Standard for the Installation of Sprinkler Systems) and NFPA 25 (Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems), and to significantly update Annex A text for the Scope statement of the document to address mixed-use buildings and the applicability of NFPA 13R systems. The revisions also clarify that once a sprinkler is removed from a fitting or welded outlet, it should not be reinstalled if torque was applied to the sprinkler itself. The revisions update the nonmetallic piping compatibility language for consistency with NFPA 13 and reorganize and restructure the section addressing sprinkler protection outside dwelling units to make it easier for the user to follow. The revisions also add language to address sprinkler protection where the device is intended to protect a glazing assembly.

Changes to the 2019 edition of NFPA 13R include revisions that add a new definition for "carport" and add several new requirements that address where pipe and tube listed for light hazard can be used in an ordinary hazard application. There are revisions to sprinkler heads that are installed under and adjacent to beams (along with new figures); inside waste and linen systems; installation of fuel-fired equipment; and obstructions in hallways. The revisions reorganize Chapter 9 and move the domestic demand tables from the annex to the body of the standard and update values. In addition, the revisions add new images clarifying sprinkler locations and clearances needed around fireplaces.

NFPA 14, Standard for the Installation of Standpipe and Hose Systems. Changes to the 2016 edition of NFPA 14, which are carried into the latest edition, include revisions to Chapter 6 to clarify the building construction and building types under which standpipe system piping needs to be protected. The revisions add new definitions of construction types to Chapter 3. The revisions also change the horizontal exit requirements in Chapter 7 to align them with building code requirements and add new annex figures. The revisions update and reorganize Section 7.3.2 in its entirety. The revisions also clarify Section 7.6, stating that only partially sprinklered buildings require 6-inch standpipes, while all others, if in a fully sprinklered building, whether combined or not, require only 4-inch standpipes, where supported by hydraulic calculations. The revisions also change the requirement for pressure gauges to no longer require gauges to be listed, only approved.

Changes to the 2019 edition of NFPA 14 include revisions that update the terminology to make it consistent throughout the document by changing the terms "outlet(s)" and "hose outlet(s)" to "hose connection(s)." The revisions add definitions and requirements for "distance monitoring," "automated inspection," and "testing" because technology now allows for monitoring of certain conditions, as well as inspecting and testing standpipe systems from a remote location. The revisions also add a definition for "open parking garage" and a requirement that permits manual standpipes in open parking garages under a certain height.

The revisions no longer require the signage for pressure requirements when the pressure is 150 psi or less, as NFPA 13E (Recommended Practice for Fire Department Operations in Properties Protected by Sprinkler and Standpipe Systems) requires a standard pressure of 150 psi unless a sign indicates more pressure is required. The revisions increase the maximum pressure permitted at any point in the system from 350 psi to 400 psi. The revisions in Section 7.8.1 clarify that the required pressure is to be calculated at the outlet of the hose valve. The revisions revise the hydraulic calculation procedures to clarify that additional standpipes should be calculated at the point of connection rather than at the topmost outlet. The revisions to Section 7.11.2 delineate between a standpipe system main drain and individual standpipe drains. The revisions also change the required number of fire department connections because of the ease with which a single connection can be compromised. Finally, the revisions add a new Chapter 13 on maritime standpipe and hose systems.

NFPA 15, Standard for Water Spray Fixed Systems for Fire Protection.. Changes to the 2017 edition of NFPA 15 include revisions on pipe support requirements and the incorporation of several new tables. To align this standard with NFPA 13 and NFPA 20 (Standard for the Installation of Stationary Pumps for Fire Protection), the revisions add a 12-month limitation on water flow test information, in addition to requirements for hydraulic design information signs and general information signs. The revisions also add a requirement that a hazard analysis be performed on the physical and chemical properties of materials, layout, design, and installation be performed by qualified persons. Finally, the revisions add new definitions for the terms "hazard analysis" and "qualified."

NFPA 16, Standard for the Installation of Foam-Water Sprinkler and Foam-Water Spray Systems. Changes to the 2015 edition of NFPA 16, which are carried into the latest edition, include revisions that update several definitions for foam-water system types, including "foam-water sprinkler system," "foam-water deluge system," "foam-water dry pipe system," and "foam-water pre-action system." The revisions also update the strainer and galvanized piping C-factor requirements to correlate with NFPA 13. The revisions make multiple changes to the standard from a system acceptance perspective, add new language to the acceptance testing criteria to confirm that the proportioning system meets the actual calculated system discharge demand at the most remote four sprinklers, and make the Contactors Material and Test Certificate from NFPA 13 a requirement for correlation purposes.

Changes to the 2019 edition of NFPA 16 include revisions that make its organization consistent with that of the 2019 edition of NFPA 13 to present information in the order it is needed when planning and designing a foam-water sprinkler/spray system. Technical changes include the addition of requirements for working drawings using information from both NFPA 11 and NFPA 13 to provide a comprehensive list of information. The revisions also extract information about the type of foam concentrate piping from NFPA 11 to be consistent with that standard and information from NFPA 30 (Flammable and Combustible Liquids Code) to address containment, drainage, and spill control.

NFPA 17, Standard for Dry Chemical Extinguishing Systems. Changes to the 2017 edition of NFPA 17, which are carried into the latest edition, include revisions to clarify the intent of component and system requirements in Chapters 4 and 5, respectively. The revisions also include editorial changes to update the standard to comply with the Manual of Style for NFPA Technical Committee Documents.

Changes to the 2021 edition of NFPA 17 include revisions that provide new requirements consistent with NFPA 12 and NFPA 2001 (Standard on Clean Agent Fire Extinguishing Systems) on the methods for supporting pipe and addresses provisions on a common failure of special hazard fire extinguishing systems, consistent with NFPA 72® (National Fire Alarm and Signaling Code®) and NFPA 2001.

NFPA 17A, Standard for Wet Chemical Extinguishing Systems. Changes to the 2017 edition of NFPA 17A, which are carried into the latest edition, include revisions that eliminate redundant language within NFPA 17A and NFPA 96 (Standard for Ventilation Control and Fire Protection of Commercial Cooking Operations) for correlation purposes. The revisions delete other sections for correlation purposes with NFPA 96. The revisions add new annex material to identify the areas of protection for the discharge nozzles. The revisions made changes requiring the authority having jurisdiction to approve used components in the system. A requirement was added for a placard to be placed near all Class K portable fire extinguishers indicating that the fire protection system must be activated before a portable fire extinguisher is used.

Changes to the 2021 edition of NFPA 17A include revisions that add a new Chapter 6 that addresses wet chemical extinguishing systems for mobile equipment. Because the application in the previous editions of the standard was limited to the protection of cooking equipment and its exhaust systems, the new Chapter 6 parallels similar requirements in NFPA 17 and addresses issues specific to wet chemical extinguishing systems. Other revisions include new provisions on the methodology of how to test for blocked piping, a new requirement that impairments be communicated in a timely manner, and modified language throughout the standard to correlate provisions between NFPA 96 and NFPA 17A.

NFPA 18, Standard on Wetting Agents. Changes to the 2017 edition of NFPA 18, which are carried into the latest edition, include both technical and editorial revisions. Technical changes include clarification that all aspects of the listing for wetting agents must be observed and an explanation on the units of the corrosion rate equation in Chapter 5. The revisions create a new section in Chapter 5 to provide requirements for alternate viscosity test methods for situations where the viscosity is too low to obtain meaningful results. Editorial changes include updating the standard to comply with the Manual of Style for NFPA Technical Committee Documents.

Changes to the 2021 edition of NFPA 18 include updated references and editorial changes to make the document more user friendly.

NFPA 20, Standard for the Installation of Stationary Pumps for Fire Protection. Changes to the 2016 edition of NFPA 20, which are carried into the latest edition, include revisions that provide new requirements for pumps in series relative to the protection of control wiring, status signals, and communications. NFPA 20 recognized the potential use of multistage, multiport pumps in fire suppression systems and provided requirements specific to that application. The revisions remove break tank criteria, which are now in accordance with NFPA 22 (Standard for Water Tanks for Private Fire Protection). The revisions add Annex C to provide guidance on controller security where a controller is connected to the internet. The revisions to Chapter 4 add new requirements to address use of an automatic fuel maintenance system with a diesel fire pump installation, and protection criteria for both a diesel fire pump room and an electric fire pump room.

Changes to the 2019 edition of NFPA 20 include revisions that recognize new technologies, including automated inspection and testing, distance monitoring, automated valves, and self-regulating variable speed fire pump units. The revisions add new provisions to require that a single entity be responsible for acceptable fire pump unit performance. The revisions add a new definition for "lowest permissible suction pressure" to provide a better understanding of the maximum available flow by connecting it to a suction pressure. The revisions add requirements to clarify where manifolding of fire pump test piping is permitted, as well as where combining fire pump test piping with relief valve discharge piping is permitted. The revisions also add new definitions to differentiate between "standby power" and "alternate power" and to ensure proper application of these terms throughout the document. The revisions define the term "very tall building" and expand the requirements pertaining to these buildings, including those for automatic tank refill valves. The revisions add new requirements and annex material to help package designers through the evaluation of mass elastic systems, as well as revise requirements for hydraulic cranking systems to distinguish between systems used as primary cranking systems and those used as secondary cranking systems. Finally, the revisions revise Annex C to make data formatting more universal.

NFPA 22, Standard for Water Tanks for Private Fire Protection Changes to the 2018 edition of NFPA 22 include revisions to Chapters 5 and 6 that remove duplicate requirements to American Water Works Association (AWWA) D100 (Welded Carbon Steel Tanks for Water Storage) and D103 (Factory-Coated Bolted Carbon Steel Tanks for Water Storage) and make references to AWWA D100 and D103 for the design, fabrication, and erection of water tanks, and requirements specific to fire protection remain. The revisions in Chapter 14 clarify requirements for check valves in the discharge pipe of a suction tank and modify tank repair requirements requiring the impairment procedures of NFPA 25 (Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems) to be followed. And the revisions in Chapter 16 add new criteria for electric immersion heaters and remove the lowest one-day mean temperature map in lieu of using calculations to determine tank heating needs.

NFPA 24, Standard for the Installation of Private Fire Service Mains and Their Appurtenances. Changes to the 2016 edition of NFPA 24, which are carried into the latest edition, include revisions that clarify the hydrant definitions to describe the type of hydrant in question, as opposed to describing when and where they would be used. The revisions rewrite the valve arrangement requirements for clarity, and annex figures are added to provide figures consistent with NFPA 13. The revisions change the title of Chapter 6 from "Valves" to "Water Supply Connections" to better describe the material in the chapter. Revisions in Section 6.1 more clearly describe the permitted exceptions to indicating valves and permit non-listed tapping sleeve and valve assemblies in connections to municipal water supplies. The revisions update the center of hose outlet measurements to include clear minimum and maximum values for the location of the outlet, along with the appropriate measurement for a hose house installation. The revisions remove steel underground piping references from the table in Chapter 10 because steel pipe is required to be listed other than in the fire department connection (FDC) line. The revisions also add a statement to allow underground fittings to be used above the ground to transition to aboveground piping.

Changes to the 2019 edition of NFPA 24 include revisions related to trenching and backfill. The revisions include acceptance testing requirements for aboveground piping and revise the standard to clarify the unacceptable use of steel piping for underground service.

NFPA 25, Standard for Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems. Changes to the 2017 edition of NFPA 25, which are carried into the latest edition, include revisions that define the new fire pump terms to align with NFPA 20. The revisions also add criteria to Chapter 4 on automated inspections and testing. The revisions add residential sprinkler replacement requirements to address sprinklers that are no longer available; add new requirements regarding missing escutcheons or, if listed, escutcheons that are no longer available; update the inspection, testing, and maintenance tables throughout the chapters; and add new no-flow test requirements for fire pumps. Revisions to Chapter 13 add new requirements for the inspection, testing, and maintenance of waterflow alarm devices, and pre-action and deluge valves. The revisions also add criteria for air compressors. This edition contains all the general pressure gauge criteria. In addition, the revisions added two new annexes: one on connectivity and data collection and another on color-coded tagging programs.

Changes to the 2020 edition of NFPA 25 include revisions that define the term "electrically operated sprinklers," which is a new technology. The revisions add periodic inspection, testing, and maintenance requirements. The revisions add requirements addressing recalled sprinklers to Chapter 4 and a section on dry hydrants to Chapter 7. The revisions also modify dry sprinkler test requirements from 10 years to 15 years and clarify the automated testing requirements for waterflow alarm devices. The revisions to Chapter 8 clarify, for safety reasons, that energized pump controllers should not be opened and introduce the concept of an isolating switch in a separate compartment as part of the pump controller. The revisions also revise the fire pump annual flow test and evaluation requirements for the test and add new requirements to Chapter 12 regarding water mist systems.

NFPA 30, Flammable and Combustible Liquids Code. Changes to the 2015 edition of NFPA 30, which are carried into the latest edition, include revisions that impose a 12-foot (3.6 m) storage height restriction on unprotected storage in mercantile occupancies, to be consistent with the storage height restriction already in place for mercantile occupancies protected in accordance with NFPA 13, for ordinary hazard Group 2. The revisions revise Chapter 16 to clarify intent and to eliminate certain inconsistencies between NFPA 30 and NFPA 13, and to correlate terminology and specific requirements in NFPA 13. Revisions to Chapter 17 and 27 reflect recommendations submitted to NFPA by the U.S. Chemical Safety and Hazard Investigation Board. The revisions add a new Annex A item, A.21.7.2.2, to address security of storage tanks in remote unattended locations at the recommendation of the U.S. Chemical Safety and Hazard Investigation Board.

Changes to the 2018 edition of NFPA 30, which are carried into the latest edition, include revising 9.4.1, which sets forth the types of containers considered acceptable under the code, to add item (8), which recognizes nonmetallic intermediate bulk containers that can satisfy the fire exposure test protocols in Section 9.4.1.1. The revisions update Section 9.4.1.1 to specifically reference UL 2368 (UL Standard Sales Site) and FM Class 6020 (Approval Standard for Intermediate Bulk Containers). The revisions replace Section 12.8 with provisions that allow only specific liquid/container combinations to be stored in such facilities. These combinations are allowed in unlimited quantities, but they must be protected in accordance with the fire protection design criteria in Chapter 16. For consistency, the revisions update Section 12.3.1 and delete (former) Section 12.3.2.