Oxygen for Lampworking: Tanks, Suppliers, and What It Actually Costs
Short answer: Most lampworkers get oxygen one of two ways — an oxygen concentrator (no refills, pulls oxygen from the air) or compressed oxygen cylinders from a welding-gas supplier. If you go with cylinders, you’ll deal with a welding-supply shop (Airgas, Linde/Praxair, or a local dealer), choose between leasing, owning, or a cylinder-exchange/swap program, and pay an ongoing fill or exchange cost on top of any lease or deposit. Costs vary a lot by region, supplier, and date, but as ballpark US ranges: a cylinder lease commonly runs roughly $50–$120/yr (or a multi-year lease for a few hundred dollars), an oxygen fill or exchange is often around $20–$40+ for a mid-size bottle, and buying a cylinder outright is a few hundred dollars (sometimes via a refundable deposit). Treat every number here as a starting point to verify locally, not a quote.
This article is the money-and-logistics companion to oxygen concentrator vs tanks for lampworking, which covers the supply decision in depth. Here we focus on where to get tank oxygen, how the programs work, and what it costs. And before you size anything, know your torch’s appetite — see how many LPM does my torch need.
Ballpark ranges, not quotes. Gas prices, lease fees, and deposits vary widely by region, supplier, cylinder size, and date, and many figures below come from community reports rather than published rate cards. Always get a current quote from your local supplier. This article is general guidance, not financial advice or a substitute for your supplier’s terms.
Tanks vs concentrators, in one paragraph
A concentrator makes oxygen from room air — higher upfront cost, but essentially no ongoing oxygen bill and no cylinders to haul, capped by a per-unit flow ceiling (commonly ~5–10 LPM). Compressed cylinders deliver high flow at high, consistent purity on demand, but you pay to refill or exchange them, handle heavy pressurized bottles, and may pay to lease the cylinder. Home studios lean concentrator; bigger or production torches lean tanks (or several concentrators). For the full comparison, read oxygen concentrator vs tanks; the rest of this guide is the tank path.
Where to get tank oxygen
Compressed oxygen for torchwork comes from welding-gas / industrial-gas suppliers, not the hardware-store propane rack. Your options:
- National suppliers — Airgas (an Air Liquide company) and Linde / Praxair are the big US networks, with branches in most metros and standardized lease/exchange programs.
- Local welding-supply shops and independent gas dealers — often friendlier on price and terms than the nationals, and frequently the best route for a small studio. Some regions also have lampworking-focused oxygen suppliers who understand artist setups.
- Cylinder retailers — you can also buy a cylinder outright (online or in store) and then have it filled/exchanged locally, though “who will fill whose cylinder” has rules (see below).
Welding/industrial vs medical oxygen
You’ll see “medical” and “welding/industrial” oxygen. The key facts:
- The oxygen molecule (O₂) is chemically identical in both, and both are typically high purity (often 99%+). For a torch, the gas performs the same. Source: WestAir, “Is Welding Oxygen the Same as Medical Oxygen?”.
- The real differences are regulatory, not chemical. Medical oxygen is an FDA-regulated prescription drug with batch testing, lot tracking, and full cylinder traceability; industrial oxygen is not FDA-certified for human use and may carry trace moisture or compressor oil that would be unacceptable medically. Source: Meritus Gas, “How Medical Oxygen Differs From Industrial Oxygen”.
For lampworking, welding/industrial oxygen is the normal, accessible choice — it needs no prescription and works fine in a torch. (Don’t try to buy medical oxygen for glasswork; it’s gated behind a prescription and offers you no benefit at the torch.) Whatever the grade, oxygen still demands the no-oil/grease, secured-cylinder handling rules in the safety setup guide.
Lease vs own vs cylinder-exchange/swap
How you hold the cylinder is a separate decision from how you fill it. There are three common models, and most studios end up leasing or swapping rather than buying.
Leasing (renting) the cylinder
You pay an annual (or multi-year) lease to the supplier and keep the bottle as long as you pay.
- Pros: low entry cost; the supplier owns and maintains the cylinder (testing/recertification is their problem); flexibility — you can return it and switch suppliers.
- Cons: the lease is forever, for as long as you keep it — over years, lease fees can add up to more than the cylinder is worth.
Source: WeldingWeb, “What do you pay for cylinder rent and gas?”, Miller forum, “Pros & Cons of Leasing vs. Owning your tanks”.
Owning (buying) the cylinder
You buy the bottle outright, then pay only to fill/exchange it.
- Pros: no recurring lease; cheaper over many years; a steel cylinder even holds resale value (a bought bottle can be worth as much or more later as steel prices rise).
- Cons: higher upfront cost; you’re responsible for recertification (periodic hydrostatic testing); and you can get locked to one distributor — by industry rule a supplier can’t fill another company’s cylinder without the owner’s written consent, so an “owned” bottle may only be fillable in limited places.
Source: Miller forum, WeldingWeb.
Cylinder exchange / swap
The most common refill model: you bring an empty and walk out with a pre-filled bottle of the same size — you don’t wait for your cylinder to be filled and returned.
- Pros: fast (no wait); you stop caring about an individual cylinder’s age/recert; pairs naturally with leasing.
- Cons: you don’t keep “your” bottle, so buying a nice cylinder and then entering an exchange pool can mean swapping your good bottle for a random one. Clarify up front whether a program is exchange or true refill.
Why many studios lease or swap rather than buy: lower upfront cost, no recert hassle, supplier flexibility, and freedom from the “locked to one distributor” trap. Buying tends to pay off only if you’ll keep the same cylinder for many years with a supplier that will reliably fill it.
Common cylinder sizes and how long they last
Cylinders come in a range of sizes, named by letter or by cubic-foot capacity — and naming varies between industrial and medical conventions, so always confirm by the cubic-foot number, not just the letter. Rough industrial oxygen lineup:
| Size (common name) | ~Capacity | Typical use |
|---|---|---|
| ”R” / 20 cu ft | ~20 cu ft (~560 L) | Small/portable, light demand |
| 40 cu ft | ~40 cu ft (~1,130 L) | Light home use |
| ”Q” / 80 cu ft (a.k.a. #3) | ~80 cu ft (~2,265 L) | Common home-shop bottle |
| 125 cu ft | ~125 cu ft (~3,540 L) | Regular but moderate use |
| 150–250 cu ft (“K” ≈ 250) | ~150–250 cu ft | Full-time / high-use shops |
Source: General Welding Supply, “Industrial Cylinder Sizes”, DuPuy Oxygen, “Understanding Cylinder Sizes”.
How long does a cylinder last? It depends entirely on your flame size and flow (LPM) — total volume divided by burn rate. Using 1 cubic foot ≈ 28.3 liters, an 80-cu-ft (≈2,265 L) bottle holds about 2,265 liters: at a modest 5 LPM that’s roughly ~450 minutes (~7.5 hours) of continuous flow; at a hungrier 10 LPM, about 3.75 hours. A big multi-stage flame run wide open empties a bottle far faster — which is why production artists keep large “K”-class (~250 cu ft) cylinders, run banks of them, or move to bulk/liquid oxygen.
These are back-of-envelope ballparks for continuous flow — real sessions include idle time, so your mileage varies. Size the bottle to how long you want to work between refills, and confirm your torch’s real draw via how many LPM does my torch need.
Negotiating with the supplier
Gas pricing is not one-size-fits-all, and a little homework saves real money:
- Open a business account. Walk-in/retail pricing is usually higher than account pricing. Even a one-person studio can often open a small commercial account for better lease and gas rates.
- Ask for the lease terms in writing. Annual vs multi-year lease, what the lease covers (recertification?), and whether there’s an early-return penalty.
- Ask about every fee, not just the gas. Suppliers may add hazmat, fuel/delivery, environmental, or safety surcharges on top of the headline fill price — these can quietly change the real cost.
- Clarify exchange vs refill. Confirm whether you’ll get your bottle back (refill) or a swap (exchange), and whether they’ll fill a cylinder you own or only ones they supply.
- Ask about multi-cylinder or volume discounts. Running two bottles, or oxygen plus a fuel gas, is a point of leverage — ask whether rates improve with more cylinders or a standing exchange schedule.
- Compare a national vs a local shop. Get a quote from both; locals are often more flexible on lease fees and willing to fill owned cylinders.
Source: WeldingWeb, “What do you pay for cylinder rent and gas?”.
Average costs across the US (ballpark ranges)
These are rough US ranges from community reports, presented as starting points that vary by region, supplier, cylinder size, and date — not quotes. Always verify locally.
| Item | Ballpark range (verify locally) | Notes |
|---|---|---|
| Cylinder lease (annual) | ~$50–$120 / yr per cylinder | One report: ~$57.50/yr + ~$75 deposit; another ~$86–$100/yr/bottle plus fees |
| Cylinder lease (multi-year) | ~$150–$200 for ~5 years | E.g. a 5-year lease cited around $165 per cylinder |
| Lease deposit | ~$75–$150 (often refundable) | Held against the leased cylinder |
| Oxygen fill / exchange | ~$20–$40+ per fill (size-dependent) | Mid-size bottle; bigger cylinders cost more per fill |
| Buy a cylinder outright | ~$150–$300+ depending on size | Then pay only fills; holds resale value |
| Surcharges | Varies | Hazmat, delivery, environmental, safety fees may apply |
Source: WeldingWeb, Miller forum.
How to read this: for an occasional hobbyist, a leased or exchanged mid-size bottle keeps upfront cost low and is simplest. If you’ll torch for years and have a supplier who’ll fill an owned cylinder, buying can win over time. And if you torch a lot, this whole cost picture is exactly why many artists run a concentrator instead — no fills, no lease — and reserve tanks for high-flow needs (see oxygen concentrator vs tanks).
Key takeaways
- Tank oxygen comes from welding/industrial-gas suppliers (Airgas, Linde/Praxair, or a local shop). Welding oxygen is the accessible choice for torchwork; medical oxygen is the same gas but FDA/prescription-gated, with no torch benefit.
- Choose among lease, own, or exchange/swap. Most studios lease or swap (low upfront cost, no recert hassle, supplier flexibility); buying pays off only over many years with a willing filler.
- Cylinder sizes run ~20 to ~250 cu ft (“K”); runtime depends on your LPM — an 80-cu-ft bottle is roughly 7+ hours at 5 LPM continuous, much less wide open.
- Negotiate: open a business account, get lease terms in writing, ask about hazmat/refill fees, clarify exchange vs refill, and ask for multi-cylinder discounts.
- Ballpark US costs (verify locally): lease ~$50–$120/yr, fill/exchange ~$20–$40+, deposit ~$75–$150, buy ~$150–$300+. Ranges, not quotes — and this is general guidance, not financial advice or your supplier’s terms.
Sources
- WestAir, “Is Welding Oxygen the Same as Medical Oxygen?” — https://westairgases.com/blog/welding-oxygen-vs-medical-oxygen/
- Meritus Gas, “How Medical Oxygen Differs From Industrial Oxygen” — https://meritusgas.com/medical-vs-industrial-oxygen/
- General Welding Supply Corp., “Industrial Cylinder Sizes” — https://www.gwsco.com/industrial-cylinder-sizes
- DuPuy Oxygen, “Understanding Cylinder Sizes and How to Choose the Right One” — https://www.dupuyoxygen.com/understanding-cylinder-sizes-and-how-to-choose-the-right-one
- WeldingWeb, “What do you pay for cylinder rent and gas?” — https://www.weldingweb.com/threads/what-do-you-pay-for-cylinder-rent-and-gas.30280/
- Miller Welding forum, “Pros & Cons of Leasing vs. Owning your tanks” — https://forum.millerwelds.com/forum/welding-discussions/8011-pros-cons-of-leasing-vs-owning-your-tanks
Editor’s note: supplier programs, cylinder naming, and especially prices vary widely by region and change over time; the cost figures here are community-reported ballpark ranges as of 2026, not quotes. Always confirm current lease terms, fees, and fill/exchange costs with your local gas supplier before committing.