1213.6 Purging Requirements. The purging of piping

shall be in accordance with Section 1213.6.1 through Section 1213.6.3. [NFPA 54:8.3]

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FUEL GAS PIPING

1213.6.1 Piping Systems Required to be Purged Outdoors. The purging of piping systems shall be in accordance with Section 1213.6.1.1 through Section 1213.6.1.5 where the piping system meets either of the following: (1) The design operating gas pressure is greater than 2

psig (14 kPa). (2) The piping being purged contains one or more sec tions of pipe or tubing meeting the size and length criteria of Table 1213.6.1. [NFPA 54:8.3.1]

TABLE 1213.6.1 SIZE AND LENGTH OF PIPING

[NFPA 54: TABLE 8.3.1]*

openings and at least 25 feet (7620 mm) from mechanical air intake openings. (3) During discharge, the open point of discharge

shall be continuously attended and monitored with a combustible gas indicator that complies with Section 1213.6.1.5. (4) Purging operations introducing fuel gas shall be

stopped when 90 percent fuel gas by volume is detected within the pipe. (5) Persons not involved in the purging operations

For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm

• CSST EHD size of 62 is equivalent to nominal 2 inches (50 mm) pipe or tubing size.

1213.6.1.1 Removal from Service. Where existing gas piping is opened, the section that is opened shall be isolated from the gas supply and the line pressure vented in accordance with Section 1213.6.1.4. Where gas piping meeting the criteria of Table 1213.6.1 is removed from service, the residual fuel gas in the piping shall be displaced with an inert gas. [NFPA 54:8.3.1.1] 1213.6.1.2 Removal of Piping. Where piping containing gas is to be removed, the line shall be first disconnected from sources of gas and then thoroughly purged with air, water, or inert gas before cutting, or welding is done. 1213.6.1.3 Placing in Operation. Where gas piping containing air and meeting the criteria of Table 1213.6.1 is placed in operation, the air in the piping shall first be displaced with an inert gas. The inert gas shall then be displaced with fuel gas in accordance with Section 1213.6.1.4. [NFPA 54:8.3.1.2]

1213.6.1.4 Outdoor Discharge of Purged Gases. The open end of a piping system being pressure vented or purged shall discharge directly to an outdoor location. Purging operations shall comply with all of the following requirements: (1) The point of discharge shall be controlled with

a shutoff valve. (2) The point of discharge shall be located at

least10 feet (3048 mm) from sources of ignition, at least 10 feet (3048 mm) from building

shall be evacuated from all areas within 10 feet (3048 mm) of the point of discharge. [NFPA 54:8.3.1.3] 1213.6.1.5 Combustible Gas Indicator. Combustible gas indicators shall be listed and calibrated in accordance with the manufacturer’s instructions. Combustible gas indicators shall numerically display a volume scale from 0 percent to 100 percent in 1 percent or smaller increments. [NFPA 54:8.3.1.4] 1213.6.2 Piping Systems Allowed to be Purged Indoors or Outdoors. The purging of piping systems shall be in accordance with the provisions of Section 1213.6.2.1 where the piping system meets both of the following: (1) The design operating pressure is 2 psig (14 kPag) or

less. (2) The piping being purged is constructed entirely from

pipe or tubing not meeting the size and length criteria of Table 1213.6.1. [NFPA 54:8.3.2] 1213.6.2.1 Purging Procedure. The piping system shall be purged in accordance with one or more of the following: (1) The piping shall be purged with fuel gas and

shall discharge to the outdoors. (2) The piping shall be purged with fuel gas and

shall discharge to the indoors or outdoors through an appliance burner not located in a combustion chamber. Such burner shall be provided with a continuous source of ignition. (3) The piping shall be purged with fuel gas and

shall discharge to the indoors or outdoors through a burner that has a continuous source of ignition and that is designed for such purpose. (4) The piping shall be purged with fuel gas that is

discharged to the indoors or outdoors, and the point of discharge shall be monitored with a listed combustible gas detector in accordance with Section 1213.6.2.2. Purging shall be stopped when fuel gas is detected. (5) The piping shall be purged by the gas supplier

in accordance with written procedures. [NFPA 54:8.3.2.1] 1213.6.2.2 Combustible Gas Detector. Combustible gas detectors shall be listed and calibrated or tested in accordance with the manufacturer’s instructions. Combustible gas detectors shall be

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capable of indicating the presence of fuel gas.

[NFPA 54:8.3.2.2] 1213.6.3 Purging Appliances and Equipment. After the piping system has been placed in operation, appliances and equipment shall be purged before being placed into operation. [NFPA 54:8.3.3]