The Safety Division oversees more than 3,100 miles of intrastate pipelines delivering gas to more than 127,500 customers within 53 communities in New Hampshire. Two natural gas utilities, two transmission operators, over 21 liquid propane gas operators, one propane-air distribution company, one master meter operator, and two methane operators are inspected at least once per biennium, although most are inspected annually. The Division utilizes 30 natural gas inspection modules with many including customized versions of federal inspection forms to conduct rigorous inspections of operators using a risk based methodology.
In 2017, New Hampshire expects to complete approximately 200 scheduled staff visits that include a sampling of nearly 1,915 miles of distribution mains feeding 1,212 miles of distribution services supplying approximately 127,500 metered customers. In addition there are approximately 20 miles of intrastate transmission pipelines within New Hampshire. Areas served include 53 communities having a population base of approximately 800,000. These figures do not include pipelines served by jurisdictional propane systems.
Franchise areas and gas pipelines operating at greater than 100 psig are shown on the map at left. These include interstate and intrastate pipeline operators, (distribution and transmission), regardless of state or federal jurisdiction.
The National Pipeline Mapping System has information for interstate gas & hazardous liquid pipelines regulated by the federal government. It is able to show detail down to the county level.