Steel Storage Tanks for Oil and Gas Operations
From upstream production sites to midstream terminals and downstream refineries, the oil and gas industry depends on welded and bolted steel tanks to store crude oil, produced water, frac water, condensate, refined products, drilling fluids, and process chemicals. Every tank operates under regulatory scrutiny, aggressive service conditions, and the expectation that it will not leak, fail, or shut down production.
MMI Tank builds API 650, API 12B, and ASME-coded storage tanks and pressure vessels for oil and gas operators across the western United States. Our ASME S and U stamps, National Board R stamp, and OSHA/MSHA/HAZWOPER certified crews mean we handle the full scope — engineering, fabrication, field erection, coating, and in-service repair — under one contract, on your schedule.
Oil and Gas Tank Applications
Crude Oil Storage
API 650 flat-bottom tanks for lease batteries, gathering stations, and terminal storage. Carbon steel construction with internal and external coatings specified for crude service — sour, sweet, heavy, or light. Floating roof and fixed-roof configurations. Capacities from 500-barrel production tanks to 100,000+ barrel terminal tanks.
Produced Water Tanks
High-volume produced water requires tanks engineered for high chloride, high TDS, and variable H₂S concentrations. API 650 or API 12B construction with chemical-resistant interior coatings. MMI’s coatings division specifies linings based on your actual water analysis — not a generic “oilfield” spec.
Frac Water Storage
Temporary and permanent frac water storage for hydraulic fracturing operations. Bolted steel tanks are the preferred construction for frac water — they install in days, relocate when the pad moves, and offer factory-applied coatings that outlast field-applied alternatives in intermittent-fill service.
Condensate and NGL Storage
Pressurized and atmospheric storage for natural gas condensate and natural gas liquids. ASME Section VIII pressure vessels for service above atmospheric; API 650 with vapor recovery for atmospheric condensate. MMI holds both ASME S and U stamps for code-stamped pressure vessel fabrication.
Refined Product Terminals
Gasoline, diesel, jet fuel, and heating oil terminal tanks built to API 650 with floating roofs (internal or external) for vapor emission control. Engineered for high throughput with multiple fill/draw nozzles, mixers, and gauging systems.
Drilling Fluid and Mud Tanks
Rectangular and cylindrical tanks for drilling mud, reserve pit replacement, and closed-loop solids control systems. Shop-fabricated for transport to drill sites; field-erected for permanent facilities.
Saltwater Disposal (SWD)
Tanks for saltwater disposal facilities receiving produced water for injection. High-chloride interior coatings, API 12B or API 650 construction, sized for injection well throughput.
Process Vessels and Separators
ASME-coded vessels for oil-water separation, gas-liquid separation, heater treaters, and test separators. Shop-fabricated pressure vessels shipped complete or field-erected for oversized units.
Codes and Standards
| Standard | Application | Typical Service |
|---|---|---|
| API 650 | Atmospheric welded tanks | Crude, refined products, produced water, frac water |
| API 12B | Bolted production tanks | Lease-site crude, produced water |
| API 12F | Shop-welded production tanks | Small lease-site storage |
| API 620 | Low-pressure tanks (≤15 psig) | Refrigerated storage, gas holders |
| ASME BPVC Sec. VIII | Pressure vessels | Separators, treaters, NGL storage |
| API 653 | In-service inspection/repair | Existing tank assessments |
| SPCC / EPA 40 CFR 112 | Spill prevention | Secondary containment requirements |
Coatings for Oil and Gas Service
- Internal epoxy — high-build systems for crude, produced water, and frac water. Selected based on H₂S exposure, chloride concentration, and operating temperature.
- Glass-fused-to-steel (bolted tanks) — superior chemical resistance for produced water and frac water where coating longevity is critical.
- Zinc-rich primer + epoxy/urethane — exterior atmospheric protection per API 652 recommendations.
- Fireproofing — intumescent and cementitious fireproofing for tanks in process areas requiring fire ratings.
- Tank bottom protection — cathodic protection and/or release prevention barrier systems per API 651.
Secondary Containment
SPCC (Spill Prevention, Control, and Countermeasure) regulations require secondary containment for oil storage above threshold volumes. MMI designs and builds:
- Steel dike walls and containment pans
- Double-wall shop-built tanks (UL 142)
- Liner-compatible ringwall foundations
- Remote impoundment systems
See our UL 142 aboveground storage tanks for double-wall options.
Tank Repair and API 653 Services
MMI’s API 653 program and National Board R stamp cover:
- Fitness-for-service assessments (minimum thickness, settlement, corrosion rates)
- Floor and shell plate replacement
- Nozzle modifications and additions
- Internal relining for change-of-service or coating failure
- Seismic retrofits and anchor bolt upgrades
- Out-of-service inspection turnarounds
Oil and Gas Tank FAQ
What API standard applies to oilfield production tanks?
API 12B covers bolted production tanks; API 12F covers small shop-welded production tanks; API 650 covers larger field-erected welded tanks for crude, water, and refined products at atmospheric pressure.
Can MMI build ASME pressure vessels for oil and gas?
Yes. We hold ASME S and U stamps and fabricate separators, treaters, scrubbers, and process vessels in our Phoenix shop. National Board registered with full MDR documentation.
Does MMI work on upstream production sites?
Yes. Our field crews are OSHA, MSHA, and HAZWOPER certified and routinely mobilize to active production sites, well pads, and gathering facilities in remote locations.
What about H₂S service?
Tanks in sour service require specific material selection (NACE MR0175 / ISO 15156 compliance for pressure vessels) and chemical-resistant coatings. MMI’s engineering team specifies materials and coatings based on your actual H₂S concentrations and operating conditions.
Does MMI provide secondary containment?
Yes. We design and build steel dike walls, double-wall tanks (UL 142), and containment systems to meet SPCC and state environmental regulations.
Request a Quote
Tell us your application, stored product, capacity, and site location. Our engineering team will recommend the right tank code, construction method, and coating system.
📞 (602) 272-6000 · 📧 info@mmitank.com · Request a quote online →
