• Codes
  • Features

    Features Overview

    Go to features
    Reference

    Reference.

    A reliable and up-to-date source of codes.
    Research

    Research.

    Rapidly and efficiently calculate project parameters.
    Collaboration

    Collaboration.

    Get everyone on the same page and streamline code research.
    Workflows
    Architects General Contractor Building Official & Plans Examiner Inspectors Owner Subcontractors Code Consultants
  • Pricing
  • Login
  • Sign Up
Sign Up
Login
  • Code Library
  • Features
  • Pricing
  • About
  • Careers
  • Help
  • Contact
  • Terms
  • Privacy
Sign Up
Upgrade to Premium
Code calculators: Code Calculators automatically generates a detailed list of requirements.
REFERENCE
Amendment Styling
Industry-leading search
Suggested code sections
Code diagrams
RESEARCH
Code calculators
Filter by topic
Code compare
Code sheet exports
COLLABORATION
Team projects
Bookmarks
Comments
START 2 WEEK FREE TRIAL
Have an account? Sign in
// CODE SNIPPET

1314.6 Purging Requirements

Los Angeles Mechanical Code > 13 Fuel Gas Piping > 1314.0 Pressure Testing and Inspection > 1314.6 Purging Requirements
JUMP TO FULL CODE CHAPTER
The purging of piping shall be in accordance with Section 1314.6.1 through Section 1314.6.3. [NFPA 54:8.3]

1314.6.1 Piping Systems Required to Be Purged Outdoors

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:
  1. The design operating gas pressure exceeds 2 psig (14 kPa).
  2. 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]
TABLE 1314.6.1
SIZE AND LENGTH OF PIPING
[NFPA 54: TABLE 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
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.

1314.6.1.1 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 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]

1314.6.1.2 Placing in Operation

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]

1314.6.1.3 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 the following requirements:
  1. The point of discharge shall be controlled with a shutoff valve.
  2. 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.
  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 1314.6.1.4.
  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 (3048 mm) of the point of discharge. [NFPA 54:8.3.1.3]

1314.6.1.4 Combustible Gas Indicator

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]

1314.6.2 Piping Systems Allowed to Be Purged Indoors or Outdoors

The purging of piping systems shall be in accordance with the provisions of Section 1314.6.2.1 where the piping system meets both of the following:
  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 criteria of Table 1314.6.1. [NFPA 54:8.3.2]

1314.6.2.1 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 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.
  5. The piping shall be purged by the gas supplier in accordance with written procedures. [NFPA 54:8.3.2.1]

1314.6.2.2 Combustible Gas Detector

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]

1314.6.3 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]

Related Code Sections


1213.6 Fuel Gas Piping, Purging Requirements
location. Purging operations shall comply with the following requirements: The point of discharge shall be controlled with a shutoff valve. The ...
Los Angeles Plumbing Code > 12 Fuel Gas Piping > 1213.0 Pressure Testing, Inspection, and Purging > 1213.6 Purging Requirements
1313.6 Fuel Gas Piping, Purging Requirements
to an outdoor location. Purging operations shall comply with all of the following requirements: The point of discharge shall be controlled ...
Los Angeles Mechanical Code > 13 Fuel Gas Piping > 1313.0 Pressure Testing and Inspection > 1313.6 Purging Requirements
1314.6 Fuel Gas Piping, Purging Requirements
to an outdoor location. Purging operations shall comply with the following requirements: The point of discharge shall be controlled with a shutoff valve. The ...
Los Angeles Mechanical Code > 13 Fuel Gas Piping > 1314.0 Pressure Testing and Inspection > 1314.6 Purging Requirements
2309.6.3.1 Motor Fuel-Dispensing Facilities and Repair Garages, System Purge Required
After installation, repair or maintenance, the hydrogen piping system shall be purged of air in accordance with the manufacturer's procedure ...
2017 LA City Fire Code > 23 Motor Fuel-Dispensing Facilities and Repair Garages > 2309 Hydrogen Motor Fuel-Dispensing and Generation Facilities > 2309.6 Defueling of Hydrogen From Fuel Storage Containers > 2309.6.3 Purging > 2309.6.3.1 System Purge Required
1313.6.1 Fuel Gas Piping, Piping Systems Required to Be Purged Outdoors
The purging of piping systems shall be in accordance with Section 1313.6.1.1 through Section 1313.6.1.4 where the piping system meets either ...
Los Angeles Mechanical Code > 13 Fuel Gas Piping > 1313.0 Pressure Testing and Inspection > 1313.6 Purging Requirements > 1313.6.1 Piping Systems Required to Be Purged Outdoors
Help Contact Us Privacy Terms
Code Compare
Code Compare
Highlight differences between any two building codes.
Search
Search
Don't miss relevant code. Quickly locate sections across your jurisdiction.
Code sheet exports
Code sheet exports
Generate a code sheet that integrates with your drawing set.
Shared projects
Shared projects
Projects provide a dedicated space to collaborate on code research.
Code Calculators
Code Calculators
Code calculators automatically generate a detailed list of requirements.
Code diagrams
Code diagrams
Unpack the code through illustrations and descriptions.
UpCodes Premium
Leverage the most sophisticated code compliance platform.
TRY FREE FOR TWO WEEKS VISIT PRICING
UpCodes Premium
Leverage the full code compliance platform.
START 2 WEEK FREE TRIAL LEARN MORE