Compressed Gas Cylinder Duration Calculator

How It Works

1. Select Gas Type

   Choose one of the local planning rows for argon, 75/25 Ar/CO2, CO2, oxygen, acetylene, or nitrogen. The row sets starting flow and cylinder defaults; it is not a supplier or welding-procedure table.

2. Choose Cylinder Size

   Select the local cylinder row that best matches the bottle you are screening. Verify the actual stamped cylinder, supplier fill volume, and pressure/weight basis before relying on the result.

3. Enter Flow Rate

   Input the regulator or flowmeter setting in CFH. The result assumes steady flow and does not deduct leaks, purge cycles, pre-flow, post-flow, or intermittent-duty behavior.

4. Review Duration and Cost

   Review estimated continuous-flow duration, cost per hour, cost per shift, and optional job-cylinder count. Treat refill prices as placeholders until supplier terms are checked.

5. Check Safety Warnings

   Read the source and safety warnings, especially for acetylene, oxygen-fuel work, cylinder storage, hot work, and any site procedure or AHJ requirement.

Built For

• Welding shop managers estimating shielding gas costs for project bids and quotes
• Fabrication shops determining optimal cylinder sizes based on daily consumption rates
• Mobile welders selecting cylinder sizes that balance run time against truck weight limits
• Welding instructors demonstrating gas consumption rates to students for cost awareness
• Purchasing agents comparing gas costs between cylinder sizes and supplier pricing
• Pipeline welders calculating gas requirements for remote field welding operations
• Maintenance welders estimating whether their current cylinder will last through a repair job

Features & Capabilities

Local Cylinder Rows

Screens R, S, Q, K, T, and 300-style local volume rows. These are planning placeholders and are not a complete supplier cylinder catalog.

Continuous-Flow Duration

Calculates duration from local cylinder volume divided by entered CFH, then shows total minutes, cost per hour, cost per shift, and cost per day.

Second-Gas Planning

Adds an optional second gas line for duration and cost planning. It does not check oxygen-fuel manifold, hose, flashback, storage, or hot-work compliance.

Acetylene Warning Screen

Flags acetylene flow against a conservative local one-tenth capacity screen and points users back to supplier, cylinder, manifold, and equipment guidance.

Source Boundaries

Shows OSHA, CGA, AWS, and supplier source pointers while keeping the local rows clearly marked as planning assumptions.

Assumptions

• Cylinder capacity is treated as a local full-cylinder planning volume at standard conditions.
• Flow rate at the regulator is constant and matches the user-specified setting throughout the weld session.
• Cylinder is full at the local planning volume with no residual-pressure, tare-weight, leak, or duty-cycle adjustment.
• Cost fields exclude rental, delivery, demurrage, hazmat, tax, and contract terms.

Limitations

• Exact supplier cylinder rows, fill pressures, CO2 weight behavior, and gas mix effects are not source-reconciled.
• System leaks at fittings, hoses, and solenoid valves are not deducted from available gas.
• Oxygen-fuel manifold, hose, flashback, reverse-flow, storage, and hot-work requirements are not checked.
• Acetylene withdrawal warnings are screening prompts only and do not replace supplier or equipment limits.

References

• OSHA 29 CFR 1910.253 - Oxygen-fuel gas welding and cutting
• OSHA 29 CFR 1926.350 - Gas welding and cutting
• CGA P-1 - Safe Handling of Compressed Gases in Containers
• AWS A5.32/A5.32M - Welding Consumables: Gases and Gas Mixtures for Fusion Welding
• Air Products Safetygram 13 - Acetylene cylinders

Frequently Asked Questions