This means that you'll be able to search for NAICS codes directly (if that's your jam). We'll do the math; let's make better data on public procurement together.
Military Chemical Gases; Medical Gases (for medical gases use code 6835); Empty Gas Cylinders and their caps, valves, and valve spare parts.
Possible NAICS Codes
325120 – Industrial Gas Manufacturing
324110 – Petroleum Refineries
221210 – Natural Gas Distribution
424690 – Other Chemical and Allied Products Merchant Wholesalers
454310 – Fuel Dealers
424710 – Petroleum Bulk Stations and Terminals
336413 – Other Aircraft Parts and Auxiliary Equipment Manufacturing