NFPA 69 Standard on ExplosionPreventionSystems 2019 NFPA IMPORTANTNOTICESANDDISCLAIMERS CONCERNINGNFPASTANDARDS NFPA° codes, standards, recommended practices, and guides ("NFPA Standards"), of which the document American National Standards Institute. This process brings together volunteers representing varied viewpoints and interests to achieve consensus on fire and other safety issues. While the NFPA administers the process and establishesrulestopromotefairnessinthedevelopmentof consensus,itdoesnotindependentlytest,evaluate,or verify the accuracy of any information or the soundness of any judgments contained in NFPA Standards. The NFPA disclaims liability for any personal injury,property, or other damages of any nature whatsoever, whether special, indirect, consequential or compensatory, directly or indirectly resulting from the publication, use of, or reliance on NFPA Standards. The NFPA also makes no guaranty or warranty as to the accuracy or completeness of any information published herein. In issuing and making NFPA Standards available, the NFPA is not undertaking to renderprofessional or other person or entity to someone else. Anyone using this document should rely on his or her own independent judgment or, as appropriate, seek the advice of a competent professional in determining the exercise of reasonable carein anygiven circumstances. The NFPA has no power, nor does it undertake, to police or enforce compliance with the contents of NFPA Standards. Nor does the NFPA list, certify, test, or inspect products, designs, or installations for compliance with this document.Any certification or other statement ofcompliance with the requirements of this document shall not be attributable to the NFPA and is solely the responsibility of the certifier or maker of the statement. REVISIONSYMBOLSIDENTIFYINGCHANGESFROMTHEPREVIOUSEDITION Text revisions are shaded. A before a section number indicates that words within that section were deleted and a to the left of a table or figure number indicates a revision to an existing table or figure. When a chapter was heavily revised, the entire chapter is marked throughout with the symbol. Where one or more sections were deleted, a · is placed between the remaining sections. Chapters, annexes, sections, figures, and tables that are new are indicated with an N. Note that these indicators are a guide. Rearrangement of sections may not be captured in the markup, but users can view complete revision details in the First and Second Draft Reports located in the archived revision information section of each code at www.nfpa.org/docinfo. Any subsequent changes from the NFPA Technical Meeting, Tentative Interim Amendments, and Errata are also locatedthere. REMINDER:UPDATINGOFNFPASTANDARDS Usersof NFPA codes, standards,recommended practices,and guides("NFPA Standards")should be aware that these documents may be superseded at any time by the issuance of a new edition, may be amended with the issuance of Tentative Interim Amendments (TIAs), or be corrected by Errata. It is intended that through regular revisions and amendments,participants in the NFPA standards development process consider the then-current and available information on incidents, materials, technologies, innovations, and methods as these develop over time and that NFPA Standards reflect this consideration. Therefore, any previous edition of this document no longer represents the current NFPA Standard on the subject matter addressed. NFPA encourages the use of the most current edition of any NFPA Standard [as it may be amended by TIA(s) or Errata] to take advantage of current experience and understanding.An official NFPA Standard at anypoint in time consists of the current edition of the document, including any issued TIAs and Errata then in effect. To determine whether an NFPA Standard has been amended through the issuance of TIAs or corrected by Errata, visit the"Codes & Standards" section at www.nfpa.org. ISBN: 978-145592262-8 (PDF) IS