21,000-Gallon Frac Tank Rental

The 21,000-gallon (500 bbl) frac tank is the industry-standard portable storage unit for industrial liquids. The dimensions, weight, and configuration are standardized across the rental market because the use cases are common: temporary capacity expansion, project staging, turnaround water management, dewatering, and containment. A single tank ships on a flatbed or roll-off chassis, sets on prepared ground without a foundation, and is connected to your operation through standard 4-inch and 6-inch flanged or camlock fittings.

The internal epoxy lining handles most non-hazardous industrial liquids, process water, wastewater, cooling water, dewatering effluent, rinse water, and project water. Chemical compatibility for specific streams is verified before deployment; for aggressive chemistry, specialty-lined tanks or coated alternatives are available on request. The tank's external steel construction is sized for full hydrostatic load, 21,000 gallons of water weighs about 87 tons, so site preparation (level, load-bearing) matters and is confirmed before drop.

Plant turnarounds are the biggest use case. A 5- to 14-day turnaround often produces and consumes more water than the facility's normal tankage can absorb, hydroblasting feed, equipment flushwater, dewatering volume, contaminated stormwater from secondary containment, holding for treatment scheduling. One or two frac tanks staged for the turnaround keep the schedule moving without forcing trucks to wait for tank capacity.

Wastewater holding is the next-largest application. When a facility's wastewater generation exceeds its treatment cadence, a process upset, a seasonal spike, a delayed haul-off, a frac tank gives you buffer capacity until trucks can be scheduled. The tank can be pumped down progressively as Cowart vacuum trucks run loads to the treatment plant.

Project water supply for hydroblasting and line flushing rounds out the heavy use cases. Hydroblasting rigs consume thousands of gallons per shift; line flushing operations sometimes consume more. Staging clean water in a frac tank on-site means the rig isn't waiting on facility water supply or competing with operations for capacity.

Most frac tank rental companies are equipment-only. They drop the tank and pick it up. Cowart's model is different: the tank is part of a service package that includes the vacuum trucks that load and unload it, the treatment plant that processes the contents, and the disposal documentation that closes the loop. For a facility running a turnaround, that means one vendor handles tank rental, water supply, wastewater pickup, treatment, and disposal, instead of three or four separate contracts.

On the operational side, the integration matters at small scale too. A frac tank that's holding wastewater for treatment doesn't need a separate vendor to come empty it; the same Cowart dispatcher who scheduled the rental schedules the pickup. The same DOT number that brought the tank takes the load. The same Certificate of Insurance covers the whole program. Pricing is predictable because the markup chain is one company instead of three.