First Revision No. 20-NFPA [ Section No ]

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1 of 25 7/15/2015 8:30 AM First Revision No. 20-NFPA [ Section No ] Nonapplication of Standard. This standard shall not apply to the following items: (1)* Piping systems covered by NFPA 2, Hydrogen Technologies Code (2)* Piping systems covered by NFPA 51, Standard for the Design and Installation of Oxygen Fuel Gas Systems for Welding, Cutting, and Allied Processes (3)* Piping systems covered by NFPA 51A, Standard for Acetylene Cylinder Charging Plants (4) Fuel-dispensing facilities covered by NFPA 52, Vehicular Gaseous Fuel Systems Code. (5)* Piping systems covered by NFPA 54, National Fuel Gas Code (6)* Piping systems covered by NFPA 55, Compressed Gases and Cryogenic Fluids Code (7)* Piping systems covered by NFPA 58, Liquefied Petroleum Gas Code (8)* LP-Gas (including refrigerated storage) at utility gas plants (see NFPA 59, Utility LP-Gas Plant Code ) (9)* LNG facilities covered by NFPA 59A, Standard for the Production, Storage, and Handling of Liquefied Natural Gas (LNG) (10) * Vehicle fuel dispensers (11) Commissioning and maintenance of equipment (12) Vent lines from pressure relief valves or devices unless such vent lines are also used for purging of flammable gas piping systems (13) * Systems regulated by U.S. Department of Transportation (DOT) 49 CFR (14) * Natural gas gathering lines and other upstream piping not regulated by U.S. Department of Transportation (DOT) 49 CFR 192 Supplemental Information File Name 56_F2016_FR-20_A.1.1.2_14_.docx Description Submittal Date: Wed May 13 11:17:37 EDT 2015 : Clarify that gathering lines and upstream piping are not in the scope of this document. Public Input No. 12-NFPA [Section No ]

2 of 25 7/15/2015 8:30 AM Public Input No. 13-NFPA [Section No ] Public Input No. 14-NFPA [New Section after A.1.1.2(6)]

3 of 25 7/15/2015 8:30 AM First Revision No. 5-NFPA [ Section No. 2.2 ] 2.2 NFPA Publications. National Fire Protection Association, 1 Batterymarch Park, Quincy, MA NFPA 2, Hydrogen Technologies Code, edition. NFPA 30, Flammable and Combustible Liquids Code, edition. NFPA 31, Standard for the Installation of Oil-Burning Equipment, edition. NFPA 51, Standard for the Design and Installation of Oxygen Fuel Gas Systems for Welding, Cutting, and Allied Processes, 2013 edition. NFPA 51A, Standard for Acetylene Cylinder Charging Plants, edition. NFPA 51B, Standard for Fire Prevention During Welding, Cutting, and Other Hot Work, 2014 edition. NFPA 52, Vehicular Gaseous Fuel Systems Code, edition. NFPA 54, National Fuel Gas Code, edition. NFPA 55, Compressed Gases and Cryogenic Fluids Code, edition. NFPA 58, Liquefied Petroleum Gas Code, edition. NFPA 59, Utility LP-Gas Plant Code, edition. NFPA 59A, Standard for the Production, Storage, and Handling of Liquefied Natural Gas (LNG), edition. NFPA 69, Standard on Explosion Prevention Systems, edition. NFPA 70, National Electrical Code, edition. NFPA 2113, Standard on Selection, Care, Use, and Maintenance of Flame-Resistant Garments for Protection of Industrial Personnel Against Short-Duration Thermal Exposures, 2015 edition. Submittal Date: Tue May 12 15:26:01 EDT 2015 : NFPA 2113 was added due to its inclusion in FR-4. Public Input No. 17-NFPA [Section No. 2.2]

4 of 25 7/15/2015 8:30 AM First Revision No. 1-NFPA [ Section No ] ASME Publications. American Society of Mechanical Engineers, Three Two Park Avenue, New York, NY ASME B31.1, Power Piping, ASME B31.3, Process Piping, ASME B31.12, Hydrogen Piping and Pipelines, Submittal Date: Tue May 12 11:09:36 EDT 2015 : Referenced current editions. Public Input No. 4-NFPA [Section No ]

5 of 25 7/15/2015 8:30 AM First Revision No. 28-NFPA [ Section No. 2.4 ] 2.4 References for Extracts in Mandatory Sections. NFPA 54, National Fuel Gas Code, edition. NFPA 55, Compressed Gases and Cryogenic Fluids Code, edition. Submitter Full Name: DANIEL GORHAM Organization: NATIONAL FIRE PROTECTION ASSOC Submittal Date: Thu Jun 11 15:20:16 EDT 2015 : Updated to most recent editions.

6 of 25 7/15/2015 8:30 AM First Revision No. 15-NFPA [ Section No ] 3.3.4* Detection Equipment. Monitoring equipment necessary for detecting and/or measuring the volume concentration of flammable gas or oxygen present in air. Submittal Date: Wed May 13 10:31:31 EDT 2015 : Determination of safety is based on the concentration of gas as opposed to volume.

7 of 25 7/15/2015 8:30 AM First Revision No. 4-NFPA [ Section No ]

8 of 25 7/15/2015 8:30 AM 4.4.1*

9 of 25 7/15/2015 8:30 AM The written procedure for each cleaning and purging activity shall address, as a minimum, the following items: (1) Scope of work and site-specific purge procedure development (a) Cleaning and purging method (b) Piping and instrument diagrams (PIDs) (c) Chemical and physical properties of flammable gas, cleaning media, purge media, and discharge gas (d) Determination of purge end point introducing flammable gas, inert gas, or air (e) Assessment and control of purge inlet and discharge locations (f) * Mitigation or capture strategies (g) Temporary piping system design Personal protective equipment (PPE) Training and qualifications (h) Management review and approval (i) Restoration of service (j) Target design, launcher/receiver venting review for pigging operations (k) Regulatory permits (l) Evaluation of engineering controls to limit potential unintended ignition of gases (controlled oxidation, flaring ) that allow gases from depressurization to be consumed in a controlled manner instead of vented (e.g., flaring or controlled combustion in process equipment). (m) Written stand-down instructions to stop activity in a controlled manner (n)* Precautions for gases that have toxic, highly toxic, unstable reactive, corrosive, or other deleterious properties beyond flammability (2)* Environmental conditions and work locations (a) (b) (c) (d) (e) (f) (g) (h) (i) Establishment and clear identification of exclusion zones where flammable gas air mixtures are likely to exist Limited access for personnel not directly involved with purge operations Assessment of potential for gas migration (e.g., building openings, adjacent structures) Prohibition of hot work within exclusion zones Lockout/tagout Impact of environmental conditions (e.g., wind speed and direction, temperature, barometric pressure) on purge operations Vehicular and air traffic, if applicable Topography Noise control/monitoring (3) Communication plans (a) Pre-job briefings (b) Work permits (c) Roles and responsibilities (d)* Emergency response plan (e) Facility alarm, alert and warning systems (f) General facility notification prior to start of purge operations (g) General facility notification at the conclusion of purge operations

10 0 of 25 7/15/2015 8:30 AM (h) Notification of regulatory authorities as required (local emergency responders, utility operators, community officials, environmental authorities, etc.) (4) Control of ignition sources (a)* Bonding and grounding considerations (b) No smoking or spark-producing work within exclusion zones (c) Elimination of hot work within exclusion zone (d) Static electricity ignition sources at discharge point (e)* Non-conductive piping, hose, or fittings in temporary piping assemblies (5) Pre-purge piping system assessment (a) (b) (c) Assessment of piping system for trapped liquids, pyrophoric solids, and other flammable or combustible deposits within the piping system Ensuring that the piping system is properly isolated Limiting site conditions that impact the safety of the activity (6)* Purge monitoring and instrumentation (a) (b) (c) (d) (e) (f) Ensuring that monitoring instruments are appropriate for gas being purged Training Calibration Monitoring frequency and reporting Appropriate selection of sample point(s) General atmosphere checks in vicinity of purge gas release (7) Protection and Rescue of Personnel (a) (b) (c) (d) (e) (f) (g) Training requirements for personnel involved in the work efforts Personal protective equipment Selection of fire-resistant clothing (FRC) shall be based on a hazard analysis in accordance with NFPA 2113 Rescue equipment, including self-contained breathing apparatus and breathing air escape packs Standby rescue personnel Primary and secondary assembly areas Assignment of personnel for alerting and accounting of personnel Supplemental Information File Name 56_F2016_FR-4_A.4.4.1_4_e_.docx 56_F2016_FR-4.docx Description New Annex section A (4)(e)

11 Submittal Date: Tue May 12 11:42:55 EDT 2015 Committee Statement: Made editorial revisions for clarity. While the current text highlights control of static electricity at the discharge point, the inclusion of non-conductive components within a temporary piping system used for venting and purging can induce static charges that may not be accounted for if the focus is limited to the discharge point. Although primarily directed at non-conductive liquids, NFPA 77 provides the essential basis for control of this hazard and, while it is generically referenced in the annex for Section 4.4.1(4)(a), drawing the user to the specifics of Section 10.3 in NFPA 77 will promote a proper review of this detail. API RP 2003 provides a full discussion of protections for static electricity and can be of assistance in evaluating the risks from static electricity. Reorganized and updated to raise the awareness level of users to these issues. Response Message: Public Input No. 16-NFPA [Section No ] Public Input No. 23-NFPA [Section No ] Public Input No. 24-NFPA [New Section after A.4.4.1(4)(a)] Public Input No. 7-NFPA [Section No ] Public Input No. 6-NFPA [New Section after 4.4.1] 1 of 25 7/15/2015 8:30 AM

12 2 of 25 7/15/2015 8:30 AM First Revision No. 12-NFPA [ Section No. 5.1 [Excluding any Sub-Sections] ] Persons whose duties fall within the scope of this standard shall be provided with training that is consistent with the scope of their job activities and assigned tasks for the cleaning or purging work to be performed. Evidence of knowledge transfer shall be included as part of the training program. Submittal Date: Wed May 13 09:29:24 EDT 2015 : Language added to help insure knowledge transfer is effective. Public Input No. 8-NFPA [Section No. 5.1 [Excluding any Sub-Sections]]

13 3 of 25 7/15/2015 8:30 AM First Revision No. 13-NFPA [ Section No ] Training records, including dates of training, name of instructor(s), content or curriculum covered, and evidence of knowledge transfer, shall be maintained for a period not less than 5 years from the date of completion of the activity. Submittal Date: Wed May 13 09:45:56 EDT 2015 : Clarification to what records must be maintained. Public Input No. 9-NFPA [Section No ]

14 First Revision No. 21-NFPA [ Section No ] 7.1.2* If the electric generating plant is owned or operated by the serving natural gas supplier, natural gas piping between the point of delivery or source valve and the plant shall be permitted to be purged into service in accordance with the serving natural gas supplier s written procedures The natural gas supplier s written procedures shall include a safety validation in accordance with Section The natural gas supplier s written procedures and process shall be coordinated with the plant operational personnel. Submittal Date: Wed May 13 12:34:47 EDT 2015 : Clarify that this is applicable explicitly to electrical generating plant. Public Input No. 20-NFPA [Section No ] 4 of 25 7/15/2015 8:30 AM

15 First Revision No. 22-NFPA [ Section No ] 8.2.1* If the electric generating plant is owned or operated by the serving natural gas supplier, natural gas piping between the point of delivery or source valve and the plant shall be permitted to be purged out of service in accordance with the serving natural gas supplier s written procedures The natural gas supplier s written procedures shall include a safety validation in accordance with Section The natural gas supplier s written procedures and process shall be coordinated with the plant operational personnel. Submittal Date: Wed May 13 12:46:00 EDT 2015 : Clarify this is explicitly applicable to electric generating plants. Public Input No. 21-NFPA [Section No ] 5 of 25 7/15/2015 8:30 AM

16 6 of 25 7/15/2015 8:30 AM First Revision No. 27-NFPA [ Section No. A.1.1.2(8) ] A.1.1.2(8) The scope of NFPA 59, Utility LP-Gas Plant Code, is included here for the convenience of the user: 1.1 Scope. [59:1.1] This code shall apply to the design, construction, location, installation, operation, and maintenance of refrigerated and nonrefrigerated utility gas plants including LP-gas containers, piping, ans associated process equipment, and controls and fire protection. Coverage of liquefied petroleum gas systems at utility gas plants shall extend to the point where LP-Gas or a mixture of LP-Gas and air is introduced into the utility distribution system. [ 59: 1.1.1] Converage begins at: (1) The point of transfer when delivery is by cargo tank vehicle or railcar (2) The liquid inlet isolation valve located downstream of hazardous liquid pipeline under the jurisdiction of 49 CFR Part 195 (3) Coverage shall extend to the point where LP-Gas vapor or mixture of LP-Gas vapor and air is introduced into the utility distribution system under the jurisdiction of 49 CFR Part 192. [ 59: 1.1.1] 1.1.2When operations that involve the liquid transfer of LP-Gas from the utility gas plant storage into cylinders or portable tanks (as defined by NFPA 58, Liquefied Petroleum Gas Code ) are carried out in the utility gas plant, these operations shall conform to NFPA 58, Liquefied Petroleum Gas Code Installations that have an aggregate water capacity of 4000 gal (15.14 m 3 ) or less shall conform to NFPA 58. [59:1.1.2] 1.1.3Installations that have an aggregate water capacity of 4000 gal (15.14 m 3 ) or less shall conform to NFPA 58, Liquefied Petroleum Gas Code. [ 59: 1.1.3] See Figure A.1.1.2(8) for a graphical representation of the scope of coverage of NFPA 59. [ 59: A ] Figure A.1.1.2(8) Typical Installation of an LP-Gas or an LP-Gas Air Facility. [59:Figure A.1.1.1] Submittal Date: Fri May 29 09:55:17 EDT 2015 : Updated to 2015 edition text.

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18 8 of 25 7/15/2015 8:30 AM First Revision No. 11-NFPA [ Section No. A ] A Inert Gas. Inert gases do not react readily with other materials under normal temperatures and pressures. For example, nitrogen combines with some of the more active metals such as lithium and magnesium to form nitrides, and at high temperatures it will also combine with hydrogen, oxygen, and other elements. The gases neon, krypton, and xenon are considered rare due to their scarcity. Although these gases are commonly referred to as inert gases, the formation of compounds is possible. For example, xenon combines with fluorine to form various fluorides and with oxygen to form oxides; the compounds formed are crystalline solids. Radon is inert under the definition provided, but because it is radioactive, it is not considered inert for the purposes of NFPA 55. [55,, ] Submittal Date: Wed May 13 09:11:34 EDT 2015 Committee Statement: Response Message: Updated the reference to most current edition. This included language that radon is an inert but should not be use. Public Input No. 1-NFPA [Global Input]

19 9 of 25 7/15/2015 8:30 AM First Revision No. 16-NFPA [ Section No. D.1.1 ] D.1.1 NFPA Publications. National Fire Protection Association, 1 Batterymarch Park, Quincy, MA NFPA 1, Fire Code, edition. NFPA 2, Hydrogen Technologies Code, edition. NFPA 30, Flammable and Combustible Liquids Code, edition. NFPA 30A, Code for Motor Fuel Dispensing Facilities and Repair Garages, edition. NFPA 37, Standard for the Installation and Use of Stationary Combustion Engines and Gas Turbines, edition. NFPA 45, Standard on Fire Protection for Laboratories Using Chemicals, edition. NFPA 51, Standard for the Design and Installation of Oxygen Fuel Gas Systems for Welding, Cutting, and Allied Processes, 2013 edition. NFPA 51A, Standard for Acetylene Cylinder Charging Plants, edition. NFPA 52, Vehicular Gaseous Fuel Systems Code, edition. NFPA 54, National Fuel Gas Code, edition. NFPA 55, Compressed Gases and Cryogenic Fluids Code, edition. NFPA 55, Compressed Gases and Cryogenic Fluids Code, edition. NFPA 58, Liquefied Petroleum Gas Code, edition. NFPA 59, Utility LP-Gas Plant Code, edition. NFPA 59A, Standard for the Production, Storage, and Handling of Liquefied Natural Gas (LNG), edition. NFPA 69, Standard on Explosion Prevention Systems, edition. NFPA 70, National Electrical Code, edition. NFPA 77, Recommended Practice on Static Electricity, 2014 edition. NFPA 85, Boiler and Combustion Systems Hazards Code, edition. NFPA 86, Standard for Ovens and Furnaces, edition. NFPA 87, Recommended Practice for Fluid Heaters, edition. NFPA 99, Health Care Facilities Code, edition. NFPA 400, Hazardous Materials Code, edition. NFPA 801, Standard for Fire Protection for Facilities Handling Radioactive Materials, 2014 edition. Submittal Date: Wed May 13 10:44:38 EDT 2015

20 0 of 25 7/15/2015 8:30 AM : Update to current editions.

21 1 of 25 7/15/2015 8:30 AM First Revision No. 17-NFPA [ Section No. D ] D AGA Publications. American Gas Association, 400 N. Capitol Street, N W, Washington, DC AGA XK0101, Purging Principles and Practices, Submittal Date: Wed May 13 10:45:21 EDT 2015 : Update to new edition of AGA document which is currently being revised. See Committee Input to revise Annex B based on new edition of AGA document. Public Input No. 5-NFPA [Chapter D]

22 2 of 25 7/15/2015 8:30 AM First Revision No. 18-NFPA [ Section No. D ] D AIChE Publications. American Institute of Chemical Engineers, Center for Chemical Process Safety, Three Park Avenue, New York, NY Crowl, D. A., Understanding Explosions, Guidelines for Hazard Evaluation Procedures, 2nd 3rd edition, Submittal Date: Wed May 13 10:47:12 EDT 2015 : Update to current edition of AIChE document.

23 3 of 25 7/15/2015 8:30 AM First Revision No. 19-NFPA [ Section No. D ] D ASME Publications. American Society of Mechanical Engineers, Three Two Park Avenue, New York, NY ASME B31.1, Power Piping, ASME B31.3, Process Piping, Submittal Date: Wed May 13 10:48:59 EDT 2015 : Updated references to current editions.

24 4 of 25 7/15/2015 8:30 AM First Revision No. 24-NFPA [ Section No. D ] D ASTM Publications. ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA ASTM E2079, Standard Test Method for Limiting Oxygen (Oxidant) Concentration for Gases and Vapors, Submittal Date: Wed May 13 12:54:40 EDT 2015 : Updated to most current edition of ASTM document.

25 5 of 25 7/15/2015 8:30 AM First Revision No. 6-NFPA [ Section No. D.3 ] D.3 References for Extracts in Informational Sections. NFPA 2, Hydrogen Technologies Code, edition. NFPA 51, Standard for the Design and Installation of Oxygen Fuel Gas Systems for Welding, Cutting, and Allied Processes, 2013 edition. NFPA 51A, Standard for Acetylene Cylinder Charging Plants, edition. NFPA 54, National Fuel Gas Code, edition. NFPA 55, Compressed Gases and Cryogenic Fluids Code, edition. NFPA 58, Liquefied Petroleum Gas Code, edition. NFPA 59, Utility LP-Gas Plant Code, edition. NFPA 59A, Standard for the Production, Storage, and Handling of Liquefied Natural Gas (LNG), edition. NFPA 69, Standard on Explosion Prevention Systems, edition. NFPA 77, Recommended Practice on Static Electricity, 2014 edition. Submittal Date: Tue May 12 15:34:58 EDT 2015 : Added NFPA 77.

Second Revision No. 5-NFPA [ Section No ] Supplemental Information. Submitter Information Verification. Committee Statement

Second Revision No. 5-NFPA [ Section No ] Supplemental Information. Submitter Information Verification. Committee Statement 1 of 7 3/4/2016 12:02 PM Second Revision No. 5-NFPA 56-2016 [ Section No. 1.1.2 ] 1.1.2 Nonapplication of Standard. This standard shall not apply to the following items: (1)* Piping systems covered by