Committee Input No. 59-NFPA [ Section No. 5.9 ]

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1 Committee Input No. 59-NFPA [ Section No. 5.9 ] 5.9 Overpressure Protection Devices General 1 Where required. Overpressure Where the serving gas supplier delivers gas at a pressure greater than 2 psi for piping systems serving appliances designed to operate at a gas pressure of 14 in. wc or less, overpressure protection devices shall be provided to prevent the pressure in the piping system from exceeding that value that would cause unsafe operation of any connected and properly adjusted appliances installed. Piping systems serving equipment designed to operate at inlet pressures greater than 14 in. wc shall be equipped with overpressure protection devices as required by the applicable equipment construction and/or installation codes and standards for the connected equipment Pressure limitation requirements. 1 The requirements of this section shall be met and a piping system deemed to have overpressure protection where a service or line pressure regulator plus one other device are installed such that the following occur: Each device limits the pressure to a value that does not exceed the maximum working pressure of the downstream system. The individual failure of either device does not result in overpressure of the downstream system Where piping systems are required to be equipped with overpressure protection devices by paragraph each overpressure protection device shall be adjusted to limit the gas pressure to each connected appliance to 2 psi or less upon a wide-open failure of the primary line pressure regulator The pressure regulating, limiting, and relieving devices shall be maintained, inspection procedures shall be devised or instrumentation installed to detect failures or malfunctions of such devices, and replacements or repairs shall be made 2.2 Each overpressure protection device installed to meet the requirements of this section shall be capable of limiting the pressure to its connected appliances as required by this section independently of any other pressure control equipment in the piping system A pressure relieving or limiting device shall not be required where the following conditions exist: (1) The gas does not contain materials that could seriously interfere with the operation of the service or line pressure regulator. (2) The operating pressure of the gas source is 60 psi (414 kpa) or less. (3) The service or line pressure regulator has all of the following design features or characteristics: (4) Pipe connections to the service or line regulator do not exceed 2 in. (50 mm) nominal diameter.

2 (5) The regulator is self-contained with no external static or control piping. (6) The regulator has a single port valve with an orifice diameter no greater than that recommended by the manufacturer for the maximum gas pressure at the regulator inlet. (7) The valve seat is made of resilient material designed to withstand abrasion of the gas, impurities in the gas, and cutting by the valve and to resist permanent deformation where it is pressed against the valve port. (8) The regulator is capable, under normal operating conditions, of regulating the downstream pressure within the necessary limits of accuracy and of limiting the discharge pressure under no-flow conditions to not more than 150 percent of the discharge pressure maintained under flow conditions Devices 2.3 Each gas piping system for which an overpressure protection device is required by this section shall be designed and installed so that a failure of the primary pressure control device(s) is detectable Each pressure relief valve shall be designed to maintain downstream pressure at or below the limits specified in paragraph at a gas flow rate equal to or greater than that supplied to it by a regulator failed wide open at the regulator s design operating inlet pressure Overpressure Protection Devices Pressure relieving or pressure limiting devices shall be one of the following: (1) Spring-loaded relief device (2) Pilot-loaded back pressure regulator used as a relief valve designed so that failure of the pilot system or external control piping causes the regulator relief valve to open (3) A monitoring regulator installed in series with the service or line pressure regulator A series (4) Pressure relief valve (5) Monitoring regulator (6) Series regulator installed upstream from the service or line regulator and set to continuously limit the pressure on the inlet of the service or line regulator to the maximum working pressure of the downstream piping system An automatic (7) values specified by or less (8) Automatic shutoff device installed in series with the service or line pressure regulator and set to shut off when the pressure on the downstream piping system reaches the maximum working pressure or some other predetermined pressure less than the maximum working pressure values specified by or less. This device shall be designed so that it will remain closed until manually reset. (9) A liquid seal relief device that can be set to open accurately and consistently at the desired pressure The devices in shall be installed either as an integral part parts of the service or line pressure regulator regulators or as separate units. Where separate pressure relieving or pressure limiting devices are installed, they shall comply with through Construction 4 Construction and Installation. All pressure relieving or pressure limiting devices shall meet the following requirements: (1) Be constructed of materials so that the operation of the device is not impaired by

3 corrosion of external parts by the atmosphere or of internal parts by the gas. (2) Be designed and installed so they can be operated to determine whether the valve is free. The devices shall also be designed and installed so they can be tested to determine the pressure at which they operate and be examined for leakage when in the closed position External 5 External Control Piping. External control piping shall be protected from falling objects, excavations, or other causes of damage and shall be designed and installed so that damage to any control piping does not render both the regulator and the overpressure protective device inoperative Setting 6 Setting. Each pressure limiting or pressure relieving device shall be set so that the gas pressure supplied to the connected appliances does not exceed a safe level beyond the maximum allowable working pressure for the piping and appliances connected. the limits specified in Unauthorized 7 Unauthorized Operation. Where unauthorized operation of any shutoff valve makes could render a pressure relieving valve or pressure limiting device inoperative, one of the following shall apply be accomplished : (1) Lock the valve in the open position. Instruct authorized personnel in the importance of leaving the shutoff valve open and of being present while the shutoff valve is closed so that it can be locked in the open position before leaving the premises. (2) Install duplicate relief valves, each having adequate capacity to protect the system, and arrange the isolating valves or three-way valve so that only one safety device relief valve can be rendered inoperative at a time Vents 8 Vents The discharge stacks, vents, or outlet parts of all pressure relieving and pressure limiting devices shall be located so that gas is safely discharged to the outdoors. Discharge stacks or vents shall be designed to prevent the entry of water, insects, or other foreign material that could cause blockage The discharge stack or vent line shall be at least the same size as the outlet of the pressure relieving device Size 9 Size of Fittings, Pipe, and Openings. The fittings, pipe, and openings located between the system to be protected and the pressure relieving device shall be sized to prevent hammering of the valve and to prevent impairment of relief capacity. Submittal Date: Thu Oct 18 19:31:56 EDT 2012 Committee Statement and Meeting Notes Committee Statement: The proposed text seeks to clarify the requirements and better represent real-world conditions. CI-59-NFPA Public Input No. 67-NFPA [Section No ] Public Input No. 69-NFPA [Section No ] Public Input No. 70-NFPA [Section No ] Public Input No. 71-NFPA [New Section after ] Public Input No. 45-NFPA [New Section after A.5.8] Public Input No. 73-NFPA [New Section after A.5.8]

4 Committee Input No. 40-NFPA [ Section No ] 5.13 Excess Flow Valve(s). Where automatic excess flow valves are installed, they shall be listed to ANSI Z21.93/CSA 6.30 and shall be sized and installed in accordance with the manufacturers' instructions. Submittal Date: Wed Oct 17 11:47:37 EDT 2012 Committee Statement and Meeting Notes Committee Statement: CI-40-NFPA It was reported to the committee that a consensus product standard is being published by CSA in early The committee added the reference to the anticipated listing standard. Committee Input No. 57-NFPA [ Section No ]

5 7.1.3 * Protection Against Corrosion. Gas piping in contact with earth or other material that could corrode the piping shall be protected against corrosion in an approved manner. When dissimilar metals are joined underground, an insulating coupling or fitting shall be used. Piping shall not be laid in contact with cinders. Uncoated threaded or socket welded joints shall not be used in piping in contact with soil or where internal or external crevice corrosion is known to occur Corrosion Protection of Piping* Steel pipe and tubing installed underground shall be installed in accordance with the following: * Steel piping installed underground shall have a cathodic protection system in accordance with unless technical justification is approved Underground piping shall comply with one of the following requirements: (A) Piping shall be made of corrosion-resistant material that is suitable for the environment in which it will be installed. (B) Piping shall be manufactured with a corrosion-resistant coating, or have a coating applied prior to being placed into service. Fittings and joints between coated pipe shall be coated. (C) Piping shall have a cathodic protection system installed and the system shall be maintained in accordance with * Cathodic protection systems shall be monitored by testing and the results shall be documented. shall be one of the following: (A) Producing a voltage of 0.85 volts or more negative, with reference to a saturated coppercopper sulfate half cell (B) Producing a voltage of 0.78 volts or more negative, with reference to a saturated KCl calomel half cell. (C) Producing a voltage of 0.80 volts or more negative, with reference to a silver-silver chloride half cell. (D) Any other method described in Appendix D of Title 49 of the Code of Federal Regulations, Part * Sacrificial anodes shall be tested in accordance with the following schedule: (A) Upon installation of the cathodic protection system, unless prohibited by climatic conditions, in which case testing shall be performed within 180 days after the installation of the system. (B) 12 to 18 months after the initial test. (C) Upon successful verification testing in accordance with (A) and (B) periodic follow-up testing shall be performed at intervals not to exceed 36 months. (D) Systems failing a test shall be repaired as soon as practical unless climatic conditions prohibit this action, in which case the repair shall be made not more than 180 days thereafter. The testing schedule shall be restarted as required in (A) and (B), and the results shall comply with (E) Documentation of the results of the two most recent tests shall be retained Impressed current cathodic protection systems shall be inspected and tested in accordance with the following schedule: (A) The sources of impressed current shall be inspected and tested at intervals not exceeding two months. (B) Impressed current cathodic protection installations shall be inspected and tested annually Where dissimilar metals are joined underground, an insulating coupling or fitting shall be used.

6 Committee Input No. 58-NFPA [ Section No. A ] Submittal Date: Thu Oct 18 18:57:20 EDT 2012 Committee Statement and Meeting Notes The committee proposes new requirements for corrosion prevention of underground steel piping. It incorporates the current state of the art in cathodic protection of underground steel pipe, and Committee recognizes that cathodic protection systems must be monitored periodically to verify that they Statement: continue to provide corrosion protection. The text was taken primarily from proposed coverage in the 2014 edition of NFPA 58. CI-57-NFPA Committee Input No. 38-NFPA [ Section No ] * CSST. CSST gas piping systems shall be bonded to the electrical service grounding electrode system The bonding jumper shall connect to a metallic pipe or fitting between the point of delivery and the first downstream CSST fitting The bonding jumper shall not be smaller than 6 AWG copper wire or equivalent. Gas piping systems that contain one or more segments of CSST shall be bonded in accordance with this section The length of the jumper between the connection to the gas piping system and a grounding electrode system shall not exceed 75 ft (yy m). Any additional electrodes shall be bonded to the electrical service grounding electrode system Where a gas piping manifold is installed, it shall also be bonded to the electrical service grounding electrode system. Submittal Date: Tue Oct 16 17:27:47 EDT 2012 Committee Statement and Meeting Notes Publication of the ballot will be held until the Executive Summary from the GTI progress report is available for incorporation. The GTI progress report indicates that there was no rupture of the CSST in modeled scenarios with a #6 AWG bonding jumper length of up to 100 ft. The Committee committee chose a conservative approach by selecting a value of 75 ft. Two of the scenarios Statement: indicate that there would be no arcing with a bonding jumper length of 75 ft. However, the committee notes that the research is not complete, and looks forward to having more data to review. CI-38-NFPA

7 A For information on corrosion protection of underground pipe components, see NACE RP 0169 SP-01-69, Control of External Corrosion on Underground or Submerged Metallic Piping Systems. Information on installation, maintenance, and corrosion protection might be available from the gas supplier. A In very dry climates, or where experience has shown that the soil is non-corrosive cathodic protection will serve no useful purpose. A Once the monitoring tests required by have been performed, the results can be compared to the criteria listed in this paragraph. The system is functioning properly if it develops volt or more negative voltage when tested with a copper-copper sulfate reference electrode. The use of a copper-copper sulfate half cell to confirm that the cathodic protection system is functioning properly is anticipated to be the most common method of testing sacrificial anode systems on fuel gas piping systems downstream of the gas meter. Other standard reference half cells can be substituted for the saturated copper copper-sulfate half cell. In addition to the standard reference half cells, other means of testing cathodic systems can be employed, and they are explained in more detail in 49 CFR 192, Appendix D. A The installation of a cathodic protection system on an underground container introduces a need to periodically verify that the system is functioning properly and protecting the container from corrosion. Sacrificial anode systems are anticipated to be the most frequently installed systems for propane underground storage containers. The testing program required for sacrificial anode systems is used widely. Initial testing is required as soon as practical after installing the system, and then the verification test is required approximately 12 to 18 months after the initial testing was done. The time periods for the initial and verification tests are allowed to be adjusted to accommodate installations that, due to inclement weather, unsuitable soil conditions, or other environmental conditions, cannot be tested immediately. If the initial test and verification test are successful, a suitable period for follow-up testing of the system should be established. A review of available standards, federal and state regulations, and recommended practices indicate that a maximum time period of 3 years is an acceptable interval for periodic testing. Should a test of the installation not achieve the required results, the sacrificial anode system must be repaired and the testing program begun again. Training material on the installation and testing of cathodic protection systems can be found in the following publications: (1) Propane Education and Research Council (PERC) video titled Cathodic Protection Systems (2) Propane Education and Research Council (PERC) publication Cathodic Protection Manual and Quiz # The requirement in provides ongoing testing to demonstrate that the cathodic protection system is operating and is in compliance with the code. Retaining test results also permits easy verification of the continued effectiveness of the cathodic protection Submittal Date: Thu Oct 18 19:07:41 EDT 2012

8 Committee Statement and Meeting Notes The committee proposes new requirements for corrosion prevention of underground steel piping. It incorporates the current state of the art in cathodic protection of underground steel pipe, and Committee recognizes that cathodic protection systems must be monitored periodically to verify that they Statement: continue to provide corrosion protection. The text was taken primarily from proposed coverage in the 2014 edition of NFPA 58. CI-58-NFPA Committee Input No. 50-NFPA [ New Section after A ] A See diagram A for an example of a double block and bleed valve system. Submittal Date: Thu Oct 18 17:09:43 EDT 2012 Committee Statement and Meeting Notes Committee Statement: CI-50-NFPA The committee added a diagram to illustrate a typical double block and bleed valve system. Committee Input No. 56-NFPA [ Section No. C.3 ]

9 C.3 Leak Check Not Using a Meter. This test can be done using one of the following methods: (1) For Any Gas System. To an appropriate checkpoint, attach a manometer or pressure gauge between the inlet to the piping system and the first regulator in the piping system, momentarily turn on the gas supply, and observe the gauging device for pressure drop with the gas supply shut off. No discernible drop in pressure should occur during a period of 3 minutes. (2) For Gas Systems Using Undiluted LP-Gas System Preparation for Propane. A leak check performed on an LP-Gas system being placed back in service can be performed by using one of the following methods: (3) By inserting a pressure gauge between the container gas shutoff valve and the first regulator in the system, admitting full container pressure to the system and then closing the container shutoff valve. Enough gas should then be released from the system to lower the pressure gauge reading by 10 psi (69 kpa). The system should then be allowed to stand for 3 minutes without showing an increase or a decrease in the pressure gauge reading. (4) For systems serving appliances that receive gas at pressures of 1 2 psi (3.5 kpa) or less, by inserting a water manometer or pressure gauge into the system downstream of the final system regulator, pressurizing the system with either fuel gas or air to a test pressure of 9 in. w.c. ± 1 2 in. w.c. (2.2 kpa ± 0.1 kpa), and observing the device for a pressure change. If fuel gas is used as a pressure source, it is necessary to pressurize the system to full operating pressure, close the container service valve, and then release enough gas from the system through a range burner valve or other suitable means to drop the system pressure to 9 in. w.c. ± 1 2 in. w.c. (2.2 kpa ± 0.1 kpa). This ensures that all regulators in the system upstream of the test point are unlocked and that a leak anywhere in the system is communicated to the gauging device. The gauging device should indicate no loss or gain of pressure for a period of 3 minutes. (5) By inserting a 30 psi (207 kpa) pressure gauge on the downstream side of the first-stage regulator, admitting normal operating pressure to the system and then closing the container valve. Enough pressure should be released from the system to lower the pressure gauge reading by 5 psi (34.5 kpa). The system should be allowed to stand for 3 minutes without showing an increase or a decrease in pressure gauge reading. Supplemental Information File Name Description Create_CI_Annex_C.docx Replacement text for C.3.2. Submittal Date: Thu Oct 18 18:45:33 EDT 2012 Committee Statement and Meeting Notes

10 (3) Shut off all gas to the appliance, and shut off any other fuel gas burning appliance within In C.3 (2) (b) and (e), the proposal incorporates new language to cover leak checking of systems utilizing a test assembly with a low pressure regulator and an inches water column gauge or a test assembly with a high pressure regulator and a 30 psi gauge as part of the test assembly. The proposal refers the reader to the type of test that should be conducted when utilizing a specific type of device. In C.3 (2) (c), there are systems that utilize a number of second-stage regulators supplied from one first-stage regulator and 2 psi systems may use a number of line pressure regulators supplied from one first-stage and a 2 psi regulator. The requirement in the test protocol is to insure regulators upstream of the selected checkpoint are unlocked. If there are piping systems with regulators in parallel within the piping system and Committee there is a leak in the parallel line, the new provisions would insure that the parallel regulator Statement: would not lockup and the leak would be detected. If there is no leak in the parallel line, the parallel regulator would lockup as expected and that is acceptable. This change specifically addresses the need for a clarification of the testing required when there is more than one second stage regulator and the procedure to ensure the regulators are unlocked during the test. Paragraph C.3 (2) (d) adds testing information for 5 psi first-stage regulators which are utilized in many of the northern States where container pressures can drop to 10 psi. The 2 psi minimum pressure reduction will insure that the first stage regulator, 5 or 10 psi outlet setting is unlocked when the leak check is performed. The addition of gauge/regulator test assemblies in C.3(2)(b) and (e), which incorporate a regulator that limits the pressure to the gauge during the test, is to recognize new types of leak check devices that are available and presently being used by LP-Gas servicemen. CI-56-NFPA Committee Notes: Date Oct 18, 2012 Submitted By Denise Beach See attachment for replacement text. Public Input No. 14-NFPA [Section No. C.3] Committee Input No. 55-NFPA [ Chapter G ] Annex G Recommended Procedure for Safety Inspection of an Existing Appliance Installation This annex is not a part of the requirements of this NFPA document but is included for informational purposes only. G.1 General. The following procedure is intended as a guide to aid in determining that an appliance is properly installed and is in a safe condition for continuing use. This procedure is intended for central furnace and boiler installations, and might not be applicable to all installations. This procedure should be performed prior to any attempt to modify the appliance or the installation. If it is determined a condition that could result in unsafe operation exists, shut off the appliance and advise the owner of the unsafe condition. The following steps should be followed in making the safety inspection: (1) Conduct a test for gas leakage. (2) Visually inspect the venting system for proper size and horizontal pitch, and determine that there is no blockage, restriction, leakage, corrosion, or other deficiencies that could cause an unsafe condition.

11 the same room. Use the shutoff valve in the supply line to each appliance. (4) Inspect burners and crossovers for blockage and corrosion. (5) Furnace Installations: Inspect the heat exchanger for cracks, openings, or excessive corrosion. (6) Boiler Installations: Inspect for evidence of water or combustion product leaks. (7) Close all building doors and windows and all doors between the space in which the appliance is located and other spaces of the building that can be closed. Turn on any clothes dryers. Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they operate at maximum speed. Do not operate a summer exhaust fan. Close fireplace dampers. If, after completing Steps 8 through 13, it is believed sufficient combustion air is not available, refer to Section 9.3 of this code. (8) Place the appliance being inspected in operation. Follow the lighting instructions. Adjust the thermostat so the appliance operates continuously. (9) Determine that the pilot, where provided, is burning properly and that the main burner ignition is satisfactory by interrupting and re-establishing the electrical supply to the appliance in any convenient manner. If the appliance is equipped with a continuous pilot, test all pilot safety devices to determine whether it is operating properly by extinguishing the pilot when the main burner is off and determining, after 3 minutes, that the main burner gas does not flow upon a call for heat. If the appliance is not provided with a pilot, test for proper operation of the ignition system in accordance with the appliance manufacturer s lighting and operating instructions. (10) Visually determine that the main burner gas is burning properly (i.e., no floating, lifting, or flashback). Adjust the primary air shutters as required. If the appliance is equipped with high and low flame controls or flame modulation, check for proper main burner operation at low flame. (11) Test for spillage at the draft hood relief opening after 5 minutes of main burner operation. Use the flame of a match or candle or smoke. (12) Turn on all other fuel gas burning appliances within the same room so they operate at their full inputs. Follow lighting instructions for each appliance. (13) Repeat Steps 10 and 11 on the appliance being inspected. (14) Return doors, windows, exhaust fans, fireplace dampers, and any other fuel gas burning appliance to their previous conditions of use. (15) Furnace Installations: Check both the limit control and the fan control for proper operation. Limit control operation can be checked by blocking the circulating air inlet or temporarily disconnecting the electrical supply to the blower motor and determining that the limit control acts to shut off the main burner gas. (16) Boiler Installations: Verify that the water pumps are in operating condition. Test lowwater cutoffs, automatic feed controls, pressure and temperature limit controls, and relief valves in accordance with the manufacturer s recommendations to determine that they are in operating condition. Supplemental Information File Name Description Create_CI_Annex_G.docx Revised Annex G Submittal Date: Thu Oct 18 18:41:29 EDT 2012

12 Committee Statement and Meeting Notes There has been an increase in discussions about what constitutes the proper procedures to follow when inspecting gas appliances, particularly before and after weatherizing a home. While, there is some existing coverage for this purpose in Annex G of the National Fuel Gas Committee Code (NFGC), it is not comprehensive and limited to central furnaces and boilers. The annex Statement: material has not been significantly updated in many years. Therefore, Annex G does not reflect modern appliances and installation practices and should be updated to include more inspection details (including actionable CO and gas leak measurements/levels) and to cover additional appliances. CI-55-NFPA Committee Notes: Date Oct 18, 2012 Submitted By Denise Beach See attachment "Create CI Annex G"

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