// CODE SNIPPET
1314.6 Purging Requirements
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The purging of piping shall
be in accordance with Section 1314.6.1 through Section
1314.6.3. [NFPA 54:8.3]
The purging of piping systems shall be in
accordance with the provisions of Section 1314.6.1.1
through Section 1314.6.1.4 where the piping system meets
either of the following:
For Sl units: 1 inch = 25 mm; 1 foot 304.8 mm
* (SST EHD size of 62 is equivalent (0 nominal 2 inches (50 mm) pipe or Tubing size.
- The design operating gas pressure exceeds 2 psig (14 kPa).
- The piping being purged contains one or more sections of pipe or tubing meeting the size and length criteria of Table 1314.6.1. [NFPA 54:8.3.1]
| NOMINAL PIPING SIZE (inches) |
LENGTH OF PIPING (feet) |
| ≥ 21/2 < 3 | > 50 |
| ≥ 3 < 4 | > 30 |
| ≥ 4 < 6 | > 15 |
| ≥ 6 < 8 | > 10 |
| ≥8 | Any length |
* (SST EHD size of 62 is equivalent (0 nominal 2 inches (50 mm) pipe or Tubing size.
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 1314.6.1.3. Where
gas piping meeting the criteria of Table 1314.6.1 is
removed from service, the residual fuel gas in the
piping shall be displaced with an inert gas. [NFPA
54:8.3.1.1]
Where gas piping
containing air and meeting the criteria of Table
1314.6.1 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 1314.6.1.3. [NFPA 54:8.3.1.2]
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:
- The point of discharge shall be controlled with a shutoff valve.
- The point of discharge shall be located not less than 10 feet (3048 mm) from sources of ignition, not less than 10 feet (3048 mm) from building openings, and not less than 25 feet (7620 mm) from mechanical air intake openings.
- During discharge, the open point of discharge shall be continuously attended and monitored with a combustible gas indicator that is in accordance with Section 1314.6.1.4.
- Purging operations introducing fuel gas shall be stopped where 90 percent fuel gas by volume is detected within the pipe.
- 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]
Combustible gas indicators shall be listed and shall
be 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]
The purging of piping systems shall be in
accordance with the provisions of Section 1314.6.2.1
where the piping system meets both of the following:
- The design operating pressure is 2 psig (14 kPa) or less.
- The piping being purged is constructed entirely from pipe or tubing not meeting the size and length criteria of Table 1314.6.1. [NFPA 54:8.3.2]
The piping system shall be purged in accordance with one or more of the
following:
- The piping shall be purged with fuel gas and shall discharge to the outdoors.
- 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.
- 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.
- The piping shall be purged with fuel gas that is discharge to the indoors or outdoors, and the point of discharge shall be monitored with a listed combustible gas detector in accordance with Section 1314.6.2.2. Purging shall be stopped where fuel gas is detected.
- The piping shall be purged by the gas supplier in accordance with written procedures. [NFPA 54:8.3.2.1]
Combustible gas detectors shall be listed and shall
be 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]
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]
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