National Grid is standardizing the gas main between Lowell and Tewksbury to enhance the overall safety and reliability of the existing gas distribution network through inline inspection technology, also referred to as a “Smart Pig”. The Smart Pig Technology utilizes sensors which are capable of detecting changes in pipe wall thickness and internal and external anomalies, such as third party damages or corrosion.
The use of this technology will eliminate the need to conduct ongoing excavations along the line to conduct pipeline inspections. Construction is expected to begin in Fall 2019, with an expected completion in early Spring 2021. Construction methods and schedules will vary along the route.
- Replace ~2.5 miles of existing pipe to 12” diameter between Riverneck Rd, Chelmsford to Wilbur Street, Lowell for effective Smart Pig operation
- Utilize Horizontal Directional Drilling (HDD) under Route 495 and Lowell Connector to eliminate need for highway excavation or road closures.
- Replace small sections of pipe in Chelmsford and Tewksbury.
- Install Smart Pig inspection device launcher at Tewksbury Take Station.
- Install Smart Pig inspection device receiver at Wilbur Regulator Station in Lowell.
- Prior to start of construction, the work areas will be prepped for vegetation management needs, placement of sediment and erosion controls and/or other necessary environmental protections.
- Existing infrastructure will be marked out by Dig Safe prior to start of excavation.
Nov 2017 – Oct 2021
EFSB Application Filling
FEIR Certificate Received
Spring / Summer 2021
By October 2021
Internal inspection of mainline and Wilbur Lateral