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]

236 2019 CALIFORNIA PLUMBING CODE

FUEL GAS PIPING

1213.6.1 Piping Systems Required to be PurgedOutdoors. The purging of piping systems shall be in accordance with the provisions of 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).

(3) During discharge, the open point of discharge

shall be continuously attended and monitored

«

(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

(3) During discharge, the open point of discharge

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

stopped where 90 percent fuel gas by volume is

(5) Persons not involved in the purging operations

shall be evacuated from 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 PurgedIndoors 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 kPa) or

less.

(1) The design operating pressure is 2 psig (14 kPa) or

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

pipe or tubing not meeting the size and length crite

(4) Purging operations introducing fuel gas shall be

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

shall be evacuated from areas within 10 feet

» » »

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] 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.

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

a shutoff valve.

(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 where fuel gas is detected. (5) The piping shall be purged by the gas supplier

in accordance with written procedures. [NFPA

TABLE 1213.6.1 SIZE AND LENGTH OF PIPING

[NFPA 54: TABLE 8.3.1]*

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.

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

(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

(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

(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

(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 igni

The point of discharge shall be located at

least10 feet (3048 mm) from sources of ignition, at least 10 feet (3048 mm) from building openings, and at least 25 feet (7620 mm) from mechanical air intake openings.

(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 capable of indicating the presence of fuel gas.

[NFPA 54:8.3.2.2]

2019 CALIFORNIA PLUMBING CODE 237

FUEL GAS PIPING any other purpose or distributed to any other persons or parti es.

FUEL GAS PIPING any other purpose

«

1215.1.3 Hybrid Pressure. The pipe size for each section of higher pressure gas piping shall be determined using the longest length of piping from the point of delivery to the most remote line pressure regulator. The pipe size from the line pressure regulator to each outlet shall be determined using the length of piping from the regulator to the most remote outlet served by the regulator.

[NFPA 54:6.1.3]