NAICS Code 237120 — Oil and Gas Pipeline and Related Structures Construction

National Industry in the official 2022 North American Industry Classification System (U.S. Census Bureau). It is the only national industry under 23712 (Oil and Gas Pipeline and Related Structures Construction).

Code	237120
Title	Oil and Gas Pipeline and Related Structures Construction
Level	National Industry (6-digit)
Edition	NAICS 2022 edition
SBA size standard	$45 million in average annual receipts

Official definition (2022 NAICS)

This industry comprises establishments primarily engaged in the construction of oil and gas lines, mains, refineries, and storage tanks. The work performed may include new work, reconstruction, rehabilitation, and repairs. Specialty trade contractors are included in this industry if they are engaged in activities primarily related to oil and gas pipeline and related structures construction. All structures (including buildings) that are integral parts of oil and gas networks (e.g., storage tanks, pumping stations, and refineries) are included in this industry.

Illustrative Examples:

Distribution line, gas and oil, construction

Oil refinery construction

Gas main construction

Petrochemical plant construction

Gathering line, gas and oil field, construction

Natural gas pipeline construction

Pumping station, gas and oil transmission, construction

Storage tank, natural gas or oil, tank farm or field, construction

Natural gas processing plant construction

Is a business under 237120 "small"?

Under the SBA size standards (13 CFR 121.201, effective March 17, 2023), a business classified in NAICS 237120 qualifies as a small business if it does not exceed $45 million in average annual receipts. Small-business status determines eligibility for federal set-aside contracts, SAM.gov certifications and SBA loan programs — receipts are averaged over the latest 5 fiscal years.

Where 237120 sits in the hierarchy

Level	Code	Title
Sector	23	Construction
Subsector	237	Heavy and Civil Engineering Construction
Industry Group	2371	Utility System Construction
NAICS Industry	23712	Oil and Gas Pipeline and Related Structures Construction
National Industry	237120	Oil and Gas Pipeline and Related Structures Construction

Related SIC codes

Via the official U.S. Census concordance (1987 SIC ↔ NAICS), shown only where the industry definition is unchanged in NAICS 2022.

SIC code	Title
1389	Oil and Gas Field Services, Not Elsewhere Classified
1623	Water, Sewer, Pipeline, and Communications and Power Line Construction
1629	Heavy Construction, Not Elsewhere Classified
8741	Management Services

Data: official 2022 NAICS structure, descriptions and Census concordances, U.S. Census Bureau — U.S. government works in the public domain (17 U.S.C. §105). Suggested reference, not an official determination.