Frac / Steel Storage Tank

Frac tanks, also known as steel storage tanks or baker tanks, are mobile, rectangular steel containments used for temporary liquid storage and transport on industrial and construction sites. Originally developed for hydraulic fracturing operations in the oil and gas industry, these rugged tanks now serve diverse sectors requiring bulk water, wastewater, or process fluid holding. The standard unit holds 21,000 gallons and features a roll-off design for truck-based mobilization.

Modèles

21,000 gal (standard)

Capacity

Marques

Fonctionnement

Frac tanks consist of welded steel construction with integrated skids or roll-off frames that enable loading and unloading via specialized trucks. The tanks feature top-mounted manholes or access hatches for filling and inspection, while discharge valves or pump-out connections at the base facilitate fluid removal. Most units include baffles to reduce fluid surge during transport and ladder access for top-side operations. Steel construction provides structural integrity for heavy liquids and allows stacking when empty for efficient transport and storage. The tanks may be configured as open-top for settling and decanting operations or closed-top for process fluids and environmental containment. Many units incorporate level indicators, venting systems, and multiple connection points to accommodate various pumping and transfer setups.

Types et variantes

Standard Frac Tank (Open Top): The industry-standard 21,000 gallon open-top unit with roll-off capability, widely used for dewatering and hydrotesting where atmospheric exposure is acceptable.
Closed Top / Process Tank: Fully enclosed steel tanks with sealed top access, designed for process fluids, volatile liquids, or applications requiring environmental containment and vapor control.
Roll-Off Tank: Tanks specifically designed with roll-off frames compatible with standard hook-lift truck systems for rapid deployment and repositioning on multi-site projects.
Compact Mobile Tank: Smaller capacity units under 10,000 gallons offering greater maneuverability and access to confined jobsites where full-size frac tanks cannot operate.
Multi-Tank / Manifold System: Multiple steel tanks interconnected to create expanded storage capacity for large-scale remediation, pipeline commissioning, or industrial shutdown projects.

Spécifications clés

Spécification	Plage typique	Signification
Capacity	21,000 gal (standard)	Standard industry size balances transportability with maximum single-truck payload; smaller and larger capacities available for specific applications.
Construction Material	Welded carbon steel	Steel construction provides durability, stacking capability, and containment integrity for a wide range of liquids and site conditions.
Dimensions (Standard)	~8' H × 8' W × 24' L	Sized for legal road transport and compatibility with standard roll-off and flatbed truck systems.
Discharge Connection	2" to 4" valve	Bottom-mounted valve or fitting size determines pump-out flow rate and hose compatibility for fluid transfer operations.
Frame Type	Integrated skid or roll-off	Frame design dictates mobilization method and site placement options, from crane-lifted skids to self-loading roll-off systems.

Comment l'industrie le dimensionne

The rental industry sizes frac tanks and steel storage tanks by liquid capacity in gallons, with 21,000 gallons representing the dominant standard unit across North America. This capacity reflects the maximum payload transportable by a single truck within typical weight limits. Smaller tanks ranging from 4,000 to 10,000 gallons serve applications requiring compact footprints or tight site access, while oversized installations combine multiple 21,000-gallon units or deploy custom tanks exceeding 30,000 gallons for pipeline testing, large-scale remediation, and industrial process support. Capacity selection balances storage requirements against site accessibility, mobilization costs, and the frequency of pump-out or refill operations.

Applications

Hydrostatic testing of pipelines, pressure vessels, and industrial systems requiring large water volumes
Construction site dewatering and sediment settling for excavation, utility work, and groundwater control
Temporary process fluid storage during plant shutdowns, turnarounds, and equipment maintenance
Environmental remediation and containment of contaminated groundwater, leachate, or industrial effluent
Hydraulic fracturing and oilfield operations requiring frac fluid staging, flowback containment, and produced water holding
Municipal and industrial water supply during emergency response, disaster relief, or infrastructure outages

Sécurité et opération

Confirm tank structural integrity, valve operation, and absence of corrosion or damage before filling to prevent catastrophic failure or environmental release
Place tanks on level, compacted surfaces with adequate load-bearing capacity to prevent settling, tipping, or structural stress when filled
Use appropriate fall protection and ladder safety when accessing top-mounted hatches or performing operations at height on tank surfaces
Ensure proper venting on closed-top tanks to prevent vacuum formation during pump-out or pressure buildup during filling
Establish secondary containment or spill prevention measures when storing hazardous, petroleum-based, or regulated substances per environmental regulations

Normes et certifications

OSHA · 29 CFR 1926 Subpart P: Excavation and trenching standards apply when tanks are used for dewatering operations adjacent to trenches and excavations.
EPA · 40 CFR 112 (SPCC): Spill Prevention, Control, and Countermeasure rules govern secondary containment and spill response for tanks holding petroleum products.
DOT · 49 CFR 393: Federal Motor Carrier Safety Regulations apply to securing and transporting frac tanks on public roadways via truck.
API · API 650 / 12F: American Petroleum Institute standards for welded steel tanks provide design and fabrication guidance, though many field tanks are built to proprietary specs.

Questions fréquentes

What is the difference between a frac tank and a baker tank?

The terms are largely interchangeable in the industry; 'frac tank' emphasizes origins in hydraulic fracturing operations, while 'baker tank' references a major early manufacturer. Both refer to the same class of mobile steel storage tanks, typically 21,000 gallons with roll-off capability.

How does capacity sizing relate to truck transport limits?

The 21,000-gallon standard emerged as the maximum water volume (approximately 175,000 lbs) that can be transported on a single truck within legal weight limits, including the tank's steel construction weight. Larger capacities require partial filling during transport or multiple units.

Can frac tanks hold chemicals or petroleum products?

Steel construction allows frac tanks to hold many industrial fluids, but compatibility depends on liquid chemistry, tank coating, and regulatory requirements. Closed-top models with appropriate seals and venting serve process fluids, while petroleum storage may trigger EPA secondary containment and reporting obligations.

What mobilization equipment is required for frac tank placement?

Roll-off frac tanks require specialized hook-lift or cable-hoist trucks that mechanically load and unload the units. Skid-mounted tanks without integrated roll-off frames need crane service or heavy forklifts for placement. Site access, overhead clearance, and ground conditions determine mobilization feasibility.