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Frac tank weight: which tank to use and when
Frac tank weight comes down to two things: storage capacity and the density of what you store. Capacity is fixed per tank. Frac water weighs 8.34 lbs per gallon, brine runs 8.5 to 10, and weighted drilling mud can top 18. The right tank holds the volume you need at a loaded weight your job site can support.
Below is a quick comparison, then a short breakdown of each IRONCLAD Powered by Mersino steel frac tank and when to choose it for weight.
Comparison table
| Frac tank | Capacity | Full of water (contents) | Choose it when |
|---|---|---|---|
| Closed Top | 500 BBL / 21,000 gal | ~175,000 lbs | You need maximum liquid storage on a prepared pad. |
| Open Top | 500 BBL / 21,000 gal or 430 BBL / 18,000 gal | ~175,000 / ~150,000 lbs | You need to view liquid levels and clean out easily. |
| Open Top Mud Tank | 240 BBL / ~10,080 gal | ~84,000 lbs (more with mud) | You're storing dense drilling mud in a smaller load. |
| Steel Mini | up to 200 BBL / ~8,400 gal | ~70,000 lbs | Space is tight or the ground can't carry a full load. |
| Double-Wall | 438 BBL / 18,430 gal | ~154,000 lbs | You need secondary containment built in. |
Add the empty tank weight (roughly 30,000 lbs for a full-size steel tank, less for a mini) to the contents for total loaded weight. Either way, the fluid dominates: a full 500 BBL tank of water tops 200,000 lbs, so size your pad and access for the loaded weight, not the empty tank. Every tank ships empty on a truck tractor or roll-off truck, which keeps the combined laden weight of the vehicle and commercial trailer legal, then fills on site after delivery.
Closed top frac tank
500 BBL / 21,000 gal, ~175,000 lbs of water when full.
The closed top tank is the most versatile unit in the fleet and the heaviest when loaded. Reach for it when you need maximum liquid storage, and your job site has a prepared pad that can carry a full-size load north of 200,000 lbs. Multiple tanks can be manifolded together when one isn't enough. Its chemical-resistant epoxy interior lining handles a wide range of production fluids across refineries, chemical plants, paper mills, and pipelines. Confirm chemical compatibility for your specific application before filling.
Open top frac tank
500 BBL / 21,000 gal or 430 BBL / 18,000 gal, ~175,000 or ~150,000 lbs of water when full.
Open top tanks sit in the same weight class as the closed top but trade the sealed roof for easy viewing of liquid levels and faster cleaning. Step down to the 430 BBL version to shave roughly 25,000 lbs off the loaded weight when your pad or fluid volume calls for it. These storage tanks suit frac water, non-caustic fluids, diesel, oils, and stormwater work on the job site.
Open top mud tank
240 BBL / ~10,080 gal, ~84,000 lbs of water when full (more with mud).
The 240 BBL open top mud tank is built for storing and mixing drilling fluids in the oil field and gas industry. Its smaller capacity keeps the load manageable, which matters because weighted mud is far denser than water. At 12 lbs per gallon, a full 240 BBL tank holds roughly 121,000 lbs of mud alone. It earns its place when your fluid is heavy and a full-size tank would overload the site.
Steel mini frac tank
Up to 200 BBL / ~8,400 gal, ~70,000 lbs of water when full.
The steel mini holds about half the volume of a standard frac tank in half the footprint, making it the lightest loaded option. This is the one for tight access or ground that can't support a full-size loaded tank. Common on municipal, wastewater, spill cleanup, and barge jobs where access or bearing capacity is limited.
Double-wall frac tank
438 BBL / 18,430 gal, ~154,000 lbs of water when full.
The double-wall tank builds secondary containment directly into the tank. Use it for hazardous liquid storage, or any site where regulations require secondary containment, since the built-in outer wall can remove the need for a separate spill containment berm. Best for chemicals, petroleum, and other production fluids that demand extra leak protection. Confirm chemical compatibility for the stored fluid.
Adjust for fluid weight
The same tank carries very different loads depending on the fluid. Weight per gallon drives the total:
- Crude oil/diesel: ~7.1–7.2 lbs/gal (lighter than water)
- Fresh/frac water: 8.34 lbs/gal
- Produced water/brine: 8.5–10 lbs/gal
- Weighted drilling fluids (mud): 9–18+ lbs/gal
For brine, production fluids, or mud, plan for the heavier number or step down to a smaller tank to keep the loaded weight your pad can support.
Not sure which tank fits your site?
Ironclad's field experts confirm storage capacity, load weight, delivery, and containment before a tank ships. Request a quote or speak to an expert.