# How to Start a Medical & Industrial Gas Distribution Business
Medical and industrial gas distribution is one of the last local businesses where a cylinder you bought for $180 keeps earning rent for 30 years. It is also heavily regulated, capital-intensive, and unforgiving of sloppy recordkeeping. If you fill or deliver oxygen, nitrogen, argon, CO2, or welding blends, the FDA treats medical gas as a drug, the DOT treats every cylinder as a hazardous material, and a single missing lot record can shut a fill line down. This guide walks through what it actually takes to start, and where the money is really made.
Two Businesses Under One Roof
Distributors usually run two overlapping lines that behave very differently. Industrial gas (welding oxygen, argon, CO2, nitrogen, acetylene, mixed shielding gases) serves fab shops, machine shops, breweries, and food processors. Margins come from the gas plus cylinder rent. Medical gas (USP oxygen, USP nitrogen, nitrous oxide, medical air) serves hospitals, clinics, dental offices, and home-care patients, and it drags a full FDA drug-manufacturing framework behind it.
Most new entrants start industrial-only because the compliance burden is lighter, then add medical once they have a fill process and traceability discipline in place. Do not try to launch both at once unless you have run a fill plant before. The medical side requires FDA facility registration, drug listing, current Good Manufacturing Practice (cGMP) controls, and lot-by-lot traceability from the bulk source to the patient's door.
Licensing and Registration You Cannot Skip
Budget several months for paperwork before your first paid delivery. The core stack:
- FDA facility registration and drug listing (medical gas only). You register the establishment and list each gas as a drug product with an NDC. This is renewed annually.
- State board of pharmacy license or wholesale drug distributor license in every state you deliver medical gas into. Requirements and fees vary widely, from a few hundred to a few thousand dollars per state.
- DOT / PHMSA hazmat registration for transporting compressed gas. Your drivers need hazmat training every three years, and cylinders must be placarded and secured.
- EPA and local fire-code approvals for bulk storage, especially oxygen and acetylene, which have strict setback and separation rules.
- CGA (Compressed Gas Association) conformance for fill procedures, color coding, and valve outlet standards.
A reasonable rule: you will spend $15,000 to $40,000 on licensing, insurance riders, and fire-code compliance before revenue if you go medical, and $5,000 to $12,000 if you stay industrial.
The Cylinder Fleet Is the Business
New operators fixate on gas margin and miss the real asset: the cylinders. A high-pressure steel cylinder costs $150 to $300 new. A liquid dewar runs $1,500 to $3,000. You own them, you rent them, and you must requalify them.
Under DOT rules, most high-pressure steel cylinders require hydrostatic requalification every 5 or 10 years depending on type and stamp; composite cylinders are shorter. Miss a requal date and the cylinder is illegal to fill. With a fleet of 3,000 cylinders, a handful of expired requal dates every month is normal, and each one is a filling-line liability. This is exactly the recordkeeping that separates profitable distributors from the ones that eat fines: every cylinder needs a serial number, gas type, test class, and next-requal date tracked as a live list, not a binder.
The Medical & Industrial Gas Distribution Ops Kit was built around this problem. Its cylinder fleet register flags DOT hydrostatic requalification due dates, ties FDA lot and fill records to each cylinder, and tracks which customer is holding which asset so you can bill demurrage instead of quietly losing steel.
Where the Money Actually Comes From
Three revenue streams, ranked by how many operators underprice them:
1. Gas fill. The obvious one. A refill of industrial oxygen might cost you $4 to $8 in gas and sell for $18 to $35. Medical USP oxygen commands more because of the compliance overhead. 2. Cylinder rent (asset rental). A customer keeps your cylinder between fills, so you charge monthly rent, typically $8 to $25 per cylinder per month depending on size. This is recurring, high-margin, and nearly pure profit once the cylinder is paid off. A shop holding 40 cylinders is a $400 to $1,000/month annuity before they buy a single fill. 3. Demurrage. This is rent that kicks in when a customer holds a cylinder past an agreed free period, or holds far more than they cycle. New distributors routinely fail to track it and leave tens of thousands of dollars on the table every year. If you cannot say, today, which customer has held cylinder #A-4471 for 340 days, you are not billing demurrage.
A distributor doing $1.2M in revenue often finds that 25 to 35 percent of gross profit comes from rent and demurrage, not gas. Track the fleet or you are running a charity that happens to sell oxygen.
Route and Delivery Economics
Gas is heavy, low-value-per-cubic-foot freight, so route density is everything. Price delivery by gas type, cylinder size, and distance, and set a minimum drop so you are not driving 40 miles to swap two argon cylinders at a loss. A realistic delivered cost per stop runs $18 to $45 once you load fuel, driver time, and cylinder handling.
Build your routes around anchor accounts: a hospital, a large fab shop, a brewery cluster. Fill in smaller stops along the same corridor. Track cost-per-stop and revenue-per-stop by route so you can fire unprofitable geography or reprice it. A common early mistake is quoting flat delivery to win an account, then discovering the account is a 90-minute round trip for one cylinder.
FDA Lot Tracking: The Thing That Passes or Fails an Audit
For medical gas, every fill must be traceable: bulk source lot, fill date, cylinder serial, operator, analytical results (oxygen concentration verified by analyzer), and where it went. During an FDA inspection you must reconstruct the chain from a customer complaint back to the bulk delivery. Handwritten fill logs that do not reconcile are the fastest way to a 483 observation or a recall.
You do not need enterprise software to do this correctly at a small-distributor scale, but you do need a disciplined, structured log that links lot to cylinder to customer. That structure is the difference between a two-hour audit and a two-week nightmare.
A Realistic 90-Day Startup Sequence
1. Weeks 1-4: Decide industrial-first vs. medical. Line up a bulk gas supply agreement with a wholesaler (Airgas, Linde, or a regional independent). Get insurance quotes for hazmat operations. 2. Weeks 3-8: File DOT hazmat registration, secure a fire-code-compliant storage yard, and if going medical, start FDA registration and state pharmacy licenses. 3. Weeks 6-10: Buy or lease an initial cylinder fleet (start with 500 to 1,500 cylinders), a delivery truck rated for hazmat, and set up your fill or exchange process. 4. Weeks 8-12: Stand up your fleet register, lot-tracking log, and route pricing model before your first delivery, not after. Sign two or three anchor accounts.
Work through the free operator's guide alongside the kit so your first customer contract already has demurrage terms in it. The distributors who thrive are not the ones with the cheapest gas. They are the ones who know exactly where every cylinder is, when it is due for requalification, and who owes them rent.