Project Description

The proposed Pipeline 34 Replacement Project will replace a 3-mile portion of 8-inch natural gas pipeline with a newly constructed 10-inch steel pipe, install three above ground valve sites, and install related pipeline inspection equipment.

The project will be installed between Walnut Street in the City of Oswego and Dutch Ridge Road in the Town of Scriba, Oswego County, New York. This project is part of National Grid’s commitment to upgrade aged infrastructure, which will allow for a more reliable and resilient natural gas system for existing customers in the greater Oswego area.

Project Need

Pipeline 34 is approximately 11 miles long and transports natural gas to roughly 8,200 customers in the greater Oswego region. A majority of the 8-inch section of this pipeline, approximately 3 miles, was identified to be constructed of pipe manufactured using a welding technique known as lap welding. 

Pipe that was manufactured using this method is still safely in operation today; however, this type of pipe manufacturing is no longer used. Lap welded pipe can be less consistent and could be less reliable as compared to pipe fabricated using other methods. Additionally, this type of pipe can be difficult to repair if damaged because of how the pipe seams join together. Replacing this portion of Pipeline 34 with pipe manufactured according to current standards is the most effective way to increase the long-term reliability of our infrastructure.

In addition to replacing the lap welded pipe, the replacement of this 8-inch section of pipeline with 10-inch pipe will result in a consistent diameter between National Grid gas regulator stations. With this consistent diameter, we can use preferred and modern inspection methods to perform assessments of the pipeline. This infrastructure upgrade is based on proactively identifying and updating our natural gas infrastructure to continue to serve our customers.

Project Benefits

  • This 8-inch section of pipe was manufactured using an outdated welding technique known as lap welding. By replacing this section of lap welded pipe, we will increase the long-term reliability of our natural gas infrastructure.
  • Replacing this section of pipeline will result in a consistent diameter for the majority of Pipeline 34. With a consistent diameter, preferred and modern pipeline inspection methods can be used.
  • Using modern construction techniques will create a section of pipeline that is more resilient to potential damage.
  • The ability to use modern inspection methods increases the ability to detect possible deficiencies in the pipeline and develop proactive solutions.


The Project team is working with various state and federal agencies to receive approval and certification for the Project. These include:

Article VII

The Project is subject to Article VII  of the New York State Public Service Law, which requires an environmental and safety impact review of the siting, design, construction, and operation of major transmission facilities in New York State.   National Grid will apply to the New York State Public Service Commission for a Certificate of Environmental Compatibility and Public Need under Section 121-a of the New York State Public Service Law. Other state agencies, such as the Department of Agriculture and Markets and the Department of Environmental Conservation, are parties to the Article VII process.

If a Certificate of Environmental Compatibility and Public Need is granted, the Project will be constructed in accordance with conditions established by the New York State Department of Public Service.  National Grid will ensure that appropriate members of the community, including affected landowners, will be informed prior to the start of construction.

Environmental Management and Construction Standards and Practices

National Grid will adopt relevant Best Management Practices from the February 2006 New York State Public Service Commission’s Environmental Management and Construction Standards and Practices (EM&CS&P). This document details the environmental management practices and construction measures allowed for these types of projects. 

Other Permits

Permits from other agencies and municipalities are required before construction can start.

  • Stormwater Pollution Prevention Plan will be needed to plan for erosion and sedimentation controls for the construction.
  • United States Army Corps of Engineers Nationwide #12 Permit will be needed for construction in wetland areas.
  • Local street opening permits will be needed for road crossings.
  • CSX Right of Occupancy Permit will be needed for railroad crossings.

Public Involvement and Comment

Throughout the Article VII Application review period, the public will have opportunities for involvement and comment on National Grid’s Pipeline 34 Replacement Project.

How to Become a Party

Interested persons who wish to participate as parties in this case may file for party status. This may be done through the New York State Department of Public Service (NYSDPS) web site. From the home page of the NYSDPS web site ( ), a prospective party should click on "Search.” On the Search page, the "Search by Case Number” box should be filled in with the number for this case (18-T-0487). This will bring the user to the main Document and Matter Management (DMM) page for this case. On that page, the prospective party should click the button at the upper right labeled "Request for Party Status” to get to a web page with instructions for the procedures to follow to become a party. An application to become a party to this case can be filed anytime while the case remains open with the Commission. You can contact National Grid directly with a question or comment.  For more information about the Project, please send us an email or call us at 1-833-731-1954.

Frequently Asked Questions


Safety is our number one priority at National Grid. Below are suggestions on what to do if you suspect a gas leak.

What do I do if I suspect a gas leak?

If you suspect a leak:

  • Do not touch anything  electrical. This could include doorbells, phones, or anything that could cause a spark
  • Do not turn on or off any electrical equipment
  • Leave windows and doors as they are
  • Leave the area immediately
  • Do not pull any plugs from electrical outlets
  • Extinguish any open flames
If you suspect a gas leak leave the area immediately and call 1-800-892-2345 or 911.

What are the signs of a gas leak?

Signs of a gas leak include:

  • Hissing or whistling sounds outside near the pipeline or inside near a gas appliance
  • Bubbling in a water body or dirt spraying in the air near the pipeline
  • Dead or dying vegetation near the pipeline
  • A rotten egg like smell 


Smell Gas.  Act Fast.  Indoors or outdoors – know what to do. From a safe location away from the smell, call 1-800-892-2345 or 911.

Planning to do any excavation? Help us protect our underground infrastructure by calling Dig Safely New York at 811 at least 2 full days before you start working.

Please visit or download our brochure for more information on natural gas safety.

Documents Library

News & Updates

  • 05/20/2019 Construction Update:
    • Recent weather caused slight delays last week
    • Crews completed the jack and bore under Churchill Road
    • Crews are continuing to pour concrete for valve sets
    • Crews are continuing to install pipe near the Churchill Road Marshaling Yard
  • 05/13/2019 Construction Update:
    • Approximately 30 % of mainline pipe is welded and strung out along ROW
    • Crews are planning to start pipe installation along Walnut Street
    • Crews are planning to begin conventional boring and pipe installation near Churchill Road
    • Crews are planning to start pouring concrete for valve sets near Churchill and Dutch Ridge Roads
    • Crews are planning to complete clearing the ROW and remove the remaining cut vegetation from ROW
  • 05/06/2019 Construction Update:
    • The ROW is approximately 99% cleared of trees.
    • The mainline pipe welding is approximately 25% complete.
    • Crews will be continuing welding work along mainline pipe, Walnut Street Station, and two valve sets.
    • Crews will be potholing along Walnut Street to locate and verify utilities.
    • Crews will also be working south of Churchill Road in the upcoming week.
  • 04/29/2019 Construction Update:
    • HDD is progressing under the railroad
    • Approximately 85 % of the ROW is cleared
    • Pipe stringing and welding is continuously ongoing 
  • 04/22/2019 Construction Update:
    • HDD is progressing under the railroad
    • Approximately 80 % of the ROW is cleared
    • Pipe stringing and welding is continuously ongoing
    • More pipe is anticipated to arrive to the marshaling yards
  • 04/15/2019 Construction Update:
    • HDD is progressing under the railroad 
    • Fabrication is occurring near Walnut Street
    • Pipe is continuously being strung and welded along the ROW
  • 04/08/2019 Construction Update:
    • Erosion control methods are continuously being installed
    • Welding and stringing of pipeline sections to begin 
    • Forestry work is occurring in the ROW from Churchill Road south to Dutch Ridge Road and Walnut Street south to the railroad tracks
  • 04/02/2019 Construction Update:
    • Pipe is continuing to arrive at marshaling yards
    • Crews are continuing to install erosion control measures from Walnut St to the railroad crossing
    • Crews are continuing to clear ROW from Walnut St south to the Railroad crossing
    • Horizontal Directional Drill equipment is being mobilized and crews are anticipated to start work near the railroad crossing in the next few weeks
  • 03/21/2019 Construction Update:
    • Construction work days will now be 11 days on 3 days off. This will create Sunday work.
  • 03/11/2019 Construction Update:
    • Construction started on March 11, 2019.
    • Crews will be mobilizing to the construction site and environmental protections will be established, as well as access roads and marshaling yards.
  • 02/25/2019 Construction Commencement Letter Mailed 
  • 11/20/2018 PSC grants Certificate of Environmental Compatibility and Public Need
  • 07/30/2018 Article VII Application Filed

Construction Process

Overview of Pipeline Construction Steps

Pipeline construction includes several phases and varies depending on the specific purpose of the pipeline and the topography where the pipeline is being installed. The general construction process follows the pattern below.

Step 1: Survey and Staking

Before any construction can start, the route is surveyed to mark the construction right-of-way (ROW). It is staked to show the temporary construction work space and any underground infrastructure that is in the area. This area is known as the "Limits of Disturbance.”

Step 2: Clearing and Grading

After the route is marked, the ROW is cleared to allow for construction activities. To minimize disturbance of the environment, only necessary vegetation is removed. After that, the route is graded if needed. Grading is generally dependent on the topography and is needed to allow construction equipment down the right of way and to avoid excessive pipe bending. Original contours would be restored as closely as possible during restoration after the pipeline construction is completed.

Step 3: Trenching

After the ROW is graded, the trench can be dug. The soil removed from the trenching is put in a storage area and is used to backfill the trench. The trench must be deep enough to meet the required cover per National Grid policy and New York State code. The minimum depth is three feet below ground surface for transmission pipelines.  Additional depth will be required for road crossings, railroad crossings, and through agricultural fields.

Step 4: Stringing, Bending, and Welding

Next, the pipe would be delivered, strung, bent to fit the route, and then welded together. The pipe is laid out in sections along the ROW. This process is known as stringing. The pipe is then bent using special machines to conform to any turns that are along the route. After the pipe is bent, it is welded together to create a continuous line. Quality welding is critical to building a safe pipeline, and every welder is required to be certified.

Step 5: Non-destructive Testing and Joint Coating

After the ends of the pipe are welded together, every weld is placed through a nondestructive testing process to ensure the integrity of the welds. These non-destructive testing practices include visual inspection by a certified weld inspector, ultrasound, magnetic particle testing, and x-ray to check the welds for deficiencies. If a deficiency is found, it is repaired. After the welds are verified, they are coated with a corrosion-resistant epoxy. Once the coating process is completed, it is placed through an inspection process known as holiday testing to ensure the integrity of the coating. If any issues are discovered, they are fixed before the pipe is lowered into the trench.

Step 6: Lowering and Backfilling

Once the welds and coatings on the welds are deemed sound, the pipeline is lowered into the trench. Sidebooms are used to lower the pipe slowly into the ground. Once in the pipe is in the trench, the excavation is backfilled with material that is non-injurious to the pipe coating. The remainder of the trench is backfilled with the original soil removed during excavation. If the original soil was rocky, extra steps are taken to screen rocks from the soil prior to placement back in the trench.

Step 7: Hydrostatic Testing

Prior to placing the new pipeline into operation, the entire installation must be hydrostatically tested in accordance with National Grid, state, and federal standards. This test pressurizes the new installation at 150 percent of the maximum allowable operating pressure of the pipeline. The pipe must sustain this pressurized test without leaking for a pre-determined amount of time. This test verifies there are no deficiencies before it is placed into service.

Step 8: Restoration

Finally, once the pipeline is operational, the restoration of the ROW can start. The goal of restoration is to reestablish original conditions as closely as possible. This involves several steps and monitoring of the area over an extend time to verify the restoration is completed. Activities during restoration may include but are not limited to: removing debris from the ROW, restoring the site to original contours as closely as possible, reseeding the area, stabilizing the soil, installing erosion and drainage features, and adding pipeline markers with contact information to show where the pipeline is and who operates it.

Project Map

Get in Touch

For more information about the Project, please send us an email or call us at (833) 731-1954.

Contact Us

National Grid
P: (833) 731-1954