NFPA 56: Standard for Fire and Explosion Prevention During Cleaning and Purging of Flammable Gas Piping Systems
Current Edition: 2014 Next Edition: 2017

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NFPA 56:
2014 Edition
Item #: 5614
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What is NFPA 56?
NFPA 56: Document Scope
1.1 Scope. 1.1.1* Applicability. This standard shall apply to fire and explosion prevention during cleaning and purging activities for new and existing flammable gas piping found in electric generating plants and in industrial, institutional, and commercial applications. 1.1.1.1* Coverage of piping systems shall extend from the point of delivery to the gas-consuming equipment isolation valve. 1.1.1.1.1 For other than undiluted liquefied petroleum gas (LP-Gas) systems, the point of delivery is the outlet of the customer meter or at the connection to a customer’s piping, whichever is farther downstream, or if there is no meter at the connection to customer piping. 1.1.1.1.2 For undiluted LP-Gas, the point of delivery is the outlet of the final pressure regulator, exclusive of line gas regulators, in the system. 1.1.1.1.3 For facilities that produce flammable gas for consumption on site, the point of delivery is the discharge isolation valve for the gas-producing equipment. 1.1.2 Nonapplication of Standard. This standard shall not apply to the following items: (1)*Piping systems covered by NFPA 2 (2)*Piping systems covered by NFPA 54 (3)*Piping systems covered by NFPA 58 (4)*LP-Gas (including refrigerated storage) at utility gas plants (see NFPA 59) (5)*LNG facilities covered by NFPA 59A (6) LP-Gas used with oxygen for cutting, welding, or other hot work (7)*Vehicle fuel dispensers (8) Commissioning and maintenance of appliances or equipment (9) Vent lines from pressure relief valves (10) Systems regulated by U.S. Department of Transportation (DOT) 49 CFR 191 and 192 1.2* Purpose. This standard provides minimum safety requirements for the cleaning and purging of flammable gas piping systems, including cleaning new or existing piping systems, purging piping systems into service, and purging piping systems out of service. 1.2.1 For the purposes of this document, a piping system shall be understood to mean a complete piping system, including valves, regulators, and other appurtenances, and any segment thereof that can be isolated from the system. 1.3 Retroactivity. The provisions of this standard reflect a consensus of what is necessary to provide an acceptable degree of protection from the hazards addressed in this standard at the time the standard was issued. 1.3.1 Unless otherwise specified, the provisions of this standard shall apply to facilities, equipment, structures, or installations that existed or were approved for construction or installation prior to the effective date of the standard. 1.3.2 The retroactive requirements of this standard shall be permitted to be modified if their application clearly would be impractical in the judgment of the authority having jurisdiction and only where it is clearly evident that a reasonable degree of safety is provided. 1.4 Equivalency. The provisions of this code are not intended to prevent the use of systems, methods, or devices of equivalent or superior quality, strength, fire resistance, effectiveness, durability, and safety over those prescribed by this standard. 1.4.1 Technical documentation shall be submitted to the authority having jurisdiction to demonstrate equivalency. 1.4.2 The system, method, or device shall be approved for the intended purpose by the authority having jurisdiction.
Official document scope
What does NFPA 56 address?
Table Of Contents.
NFPA 56, 2014 Edition: Archived Revision Information
Report on Proposals (ROP)
Report on Proposals (ROP)
Proposals can be submitted for text to be amended or included in NFPA Codes and Standards. Following the Call for Proposals period, the responsible Technical Committee or Panel holds a meeting to consider and act on all submitted proposals. The committee or panel may also develop its own proposals. A document known as the Report on Proposals (ROP) is prepared containing all the Public Proposals, Technical Committees' action on each Proposal, as well as all Committee-generated proposals. The ROP for the document in question is submitted for the approval of the responsible TC or Panel by a formal written ballot. If the ROP does not receive approval via written ballot in accordance with NFPA rules, the Report is returned to the committee for further consideration and is not published. If the necessary approval is received, the ROP is published in a compilation of Reports on Proposals issued by NFPA twice yearly for public review and comment, and the process continues to the next step. The ROP is published and widely distributed and anyone may download or request a copy.
ROP Meeting Notice
ROP Meeting Notice
Note: Please contact the appropriate staff liaison (listed on the Technical Committee tab) for information on attending an NFPA Technical Committee meeting as a guest. Read NFPA"s Regulations Governing Committee Projects (Section 3.3.3.3) for further information.
ROP Meeting Agenda
ROP Meeting Minutes
ROP Ballot
ROP Ballot
The ballots posted on this page are for public information only. Voting on ballots is permitted by committee members only. See NFPA Regulations Governing Committee Projects, Section 3.3.4.
Ballot (PDF, 616 KB)
Ballot Form (PDF, 216 KB)
Ballot Circulation (PDF, 65 KB)
Ballot Final (PDF, 93 KB)
Report on Comments (ROC)
Report on Comments (ROC)
Once the ROP becomes available, there is a 60-day comment period during which time anyone may submit a public comment on the proposed changes documented in the ROP. The committee or panel reconvenes at the end of the comment period and acts on all public comments. This committee or panel may also develop its own comments. As before, approval obtained via written ballot in accordance with NFPA's Regulations is required on all committee and panel actions. All of this information is compiled into a second Report, called the Report on Comments (ROC), which like the ROP, is published and made available for public review for a seven-week period.
Report on Comments (ROC) (PDF, 744 KB)
ROC Meeting Notice
ROC Meeting Notice
Note: Please contact the appropriate staff liaison (listed on the Technical Committee tab) for information on attending an NFPA Technical Committee meeting as a guest. Read NFPA"s Regulations Governing Committee Projects (Section 3.3.3.3) for further information.
ROC Meeting Agenda
ROC Meeting Minutes
ROC Ballot
ROC Ballot
The ballots posted on this page are for public information only. Voting on ballots is permitted by committee members only. See NFPA Regulations Governing Committee Projects, Section 3.3.4.
Ballot (PDF, 265 KB)
Ballot Form (PDF, 83 KB)
Ballot Circulation (PDF, 58 KB)
Ballot Final (PDF, 61 KB)
Motions Committee Report (NITMAM)
Motions Committee Report (NITMAM)
Proposed NFPA documents will be presented for action at the applicable Annual (June) Association Technical Meeting only when proper Amending Motions (Notice of Intent to Make a Motion - NITMAM) have been certified by the Motions Committee of the Standards Council as a proper amending motion. Documents that receive no motions will not be presented at the meeting and instead will be forwarded directly to the NFPA Standards Council for action on issuance. More about the codes and standards making process including NITMAM.
No NITMAMs
Association Technical Meeting
Consent document not presented at Association Technical Meeting. Document issuance: 5/28/2013
Archived revision information
NFPA 56, 2014 Edition: Archived Revision Information
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