NFPA 13: 2022 [paper]

NFPA 13: 2022 [paper]

Standard for the Installation of Sprinkler Systems


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NFPA 13 – Standard for the Installation of Sprinkler Systems

The industry benchmark for design and installation of automatic fire sprinkler systems, NFPA 13 addresses sprinkler system design approaches, system installation, and component options to prevent fire deaths and property loss.

The recently released 2022 edition of NFPA 13, Standard for the Installation of Sprinkler Systems contains a number of significant changes. While the 2019 edition of the standard underwent a dramatic reorganization, it was a relatively quiet cycle for technical revisions. The 2022 edition of the standard; however, makes up for that with many updates that will affect all the different users of the document.

A list of the most notable changes featured in the new edition:

  • Single point density
    This is perhaps as big a fundamental shift in the application of NFPA 13 as we have seen in a long time. For decades users have been familiar with using density/area curve to calculate sprinkler density, but the 2022 edition does away with the curves (with an exception for existing systems) in favor of specifying a single-point method of density calculation. An entire article could be dedicated to this issue, but the short version is that not all points along the curves had truly been proven. Some supported it with the argument that at the time of their introduction they could be quite useful based on water supply, but today there is a wider selection of sprinklers with various K-factors that can allow for added flexibility.
  • Rack storage updated again
    Chapter 25 on the protection of rack storage using in-rack sprinklers has been completely rewritten and reorganized. This chapter consolidates all the in-rack sprinkler design criteria into one chapter. Users can now determine all their protection options for in-rack sprinklers—and the accompanying ceiling sprinkler system—without having to leave the chapter. One notable technical change involves the fact that multiple row racks will need to be limited to a depth of 20 feet or they will need to be considered solid shelving; driving a need for in-rack sprinklers.
  • Remote areas – considering walls
    This next topic addresses a new paragraph of text added to the standard specifying that where a sprinkler is located next to a full-height wall, the area on the opposite side of the wall cannot be counted toward the total design area even if the sprinkler’s assigned area of discharge would theoretically extend beyond the wall. This could result in additional sprinklers being required to be included in the determination of remote area demands. Some argue that this is a clarification of what has always been intended while others disagree. Either way, this makes it clear as to the approach that must be taken.
  • Nitrogen System Updates
    Several additions have been made throughout the standard to better address the use of nitrogen for use with dry-pipe sprinkler systems. A key consideration here is the allowance for more favorable friction loss values for new dry pipe systems where nitrogen is used, provided the supply meets a certain set of criteria.
  • Working plans checklist
    Modifications to the working plans checklist include several new or adjusted items. Those submitting plans, as well as plan reviewers, will need to give this area some additional attention.
  • More hydraulic information signs
    The standard has been revised to require hydraulic design information signs to be placed in more locations on systems than was previously required. Rather than just at the alarm valve, dry pipe valve, preaction valve, or deluge valve, signs must now be provided at every system riser and every floor control assembly in addition to the locations previously required. This will have additional impact on system ITM as the signs will need inspection as part of NFPA 25, Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems requirements.


Published: October 2021

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