Oilfield Tank Monitoring: Tank Battery Levels, Alarms, and Sensors That Hold Up in the Field

Short version: Oilfield tank monitoring tells you the level in every crude, condensate, and produced water tank on a tank battery without sending a pumper to gauge it. A sensor reads the level, a gateway sends it out, and your phone gets an alert before a tank runs over or a haul comes up short. Full SCADA still fits sites where you need to shut in or control equipment from the office. On conventional tank batteries where SCADA never penciled, a self-installed monitor like TinyPumper covers the job without the project.

It’s Sunday afternoon. The water tank on the north battery is climbing because a flowline started carrying more water on Friday. Nobody gauges on Sunday. By Monday morning there’s saltwater on the pad and a phone call you don’t want to make. Tank monitoring exists for that weekend.

This page is for you if:

• You run tank batteries and you find out about full tanks, short hauls, or leaks after the fact.
• You schedule crude and water haulers off a gauge sheet that is a day or two old.
• You were quoted SCADA for your batteries and the math never worked.
• You want to know what tank monitoring really takes before you buy anything.

The size of your operation doesn’t decide this. A producer with a few batteries and one with hundreds ask the same question: what does this site need to see?

What is oilfield tank monitoring?

Oilfield tank monitoring is the practice of reading tank levels at a producing site remotely and acting on them. It covers the stock tanks that hold crude or condensate, the water tanks that hold produced water, and the alarms that fire when a level crosses a line you set. It is not the same as tank gauging for a run ticket. A run ticket is a measured, witnessed number for custody transfer. Tank monitoring is the running picture in between.

On a typical battery that means:

• Crude and condensate tanks. How full they are, how fast they are filling, and when a haul is due.
• Produced water tanks. The tanks that run over first, because water rates move more than anyone expects.
• High and low alarms. A high-tank alarm before a run-over. A sudden drop that points to a leak, a theft, or an unplanned haul.
• Fill rate. A tank filling slower than last week often means a well problem upstream, not a tank problem.

Tank monitoring is one piece of oilfield monitoring. The same site usually has pressures and pump runtime worth watching too.

How do oilfield tank monitors work?

Every tank monitor that works in the field has the same four parts.

1. A level sensor on the tank. It reads how much fluid is in the tank.
2. A way to get the reading off the lease. Radio, cellular, or satellite. On remote leases this is where most systems fail.
3. Software that shows the level and sends the alert. A dashboard nobody opens is not monitoring. The alert has to reach a phone.
4. A person who acts. Someone owns the alert: call the hauler, send the pumper, or shut the well in.

Skip any one of the four and you paid for a gadget, not a system. The fourth part is the one most producers forget. Before you buy, decide who gets the high-tank alert at 2 AM.

How does a level reading turn into barrels?

A tank sensor reports a level: feet and inches of fluid. Barrels come from the tank’s gauge table, often called a strapping table, which converts height to volume for that size and shape of tank. Every stock tank on a battery should have one, and the same table your pumper uses to turn a hand gauge into barrels works on a sensor reading.

Before you buy any monitor, ask two things. Do readings come back as a level, as barrels, or both? And who keeps the tank tables current when a tank gets swapped? A level alarm works either way. Haul planning and missing-barrel checks need barrels.

How can I monitor tank levels on a tank battery?

There are three common ways, and most producers use more than one.

Method	What it gives you	Where it breaks
Pumper gauging by hand	An accurate reading once a day, plus eyes on the site	Nothing between visits. Weekends and bad roads leave gaps
SCADA with tank level transmitters	Continuous levels, plus control: shut-ins, valves, setpoints	Install and upkeep cost. Often never pencils on conventional batteries
Self-installed tank monitor	Levels and alarms on your phone between visits	It reads and alerts. It does not shut the well in

Hand gauging stays. A pumper on site catches leaks, smells, and a bad dump valve that no sensor sees. Monitoring is what covers the hours when nobody is there.

What is tank battery monitoring?

Tank battery monitoring is tank monitoring at the battery level: every stock tank and water tank on one pad, watched as one site. That matters because tanks on a battery are connected. Oil and water move through the separator and treater into different tanks, and one problem shows up in several places.

What to watch on a battery:

• Every tank, not just the first one. When the first stock tank fills and the equalizer line carries oil to the next, the second tank’s level is the one that matters.
• The water side. Produced water tanks fill on their own schedule and they run over first.
• Fill rate by tank. A change in how fast a tank fills is often the earliest sign a well upstream changed.
• Unexpected drops. A level that falls with no haul scheduled is worth a call that same hour.

If you are laying out a new battery, our walkthrough on tank battery design covers how tanks, lines, and the separator fit together.

What is the best tank level alarm for a tank battery?

The best alarm is the one that reaches a person in time and doesn’t cry wolf. In the oilfield that comes down to three things.

• It reaches a phone, not just a light on site. A horn or a beacon helps only if someone is standing there.
• You set the line. High-tank and low-tank levels should match each tank and your haul schedule, not a factory default.
• It keeps watching between readings. A sensor that only checks in on a slow schedule can miss a fast-filling water tank. Ask how the alarm is checked, not just how often the level is reported.

A high-tank alarm prevents a run-over. A sudden-drop alarm catches a leak or a load that wasn’t supposed to leave. Most producers want both.

Which tank level sensor holds up in the field?

Sensor type decides how long the system lasts. Here are the common choices and how each fares on a producing site.

Sensor type	How it reads	Field reality
Radar on top of the tank	Bounces a signal off the fluid surface	No fluid contact. Nothing to corrode, foul, or freeze
Float and magnetic gauges	A float rides the fluid surface	Paraffin, ice, and stuck floats give bad readings
Submersible pressure sensors	Sit in the fluid and read its weight	Corrode, foul, and freeze. Pulling one is a job
Hand gauge and tape	A pumper gauges through the thief hatch	Accurate for run tickets. Only as current as the last visit

TinyPumper uses radar on top of the tank. It never touches the crude or the brine, so it works on oil, water, and saltwater tanks the same way.

How much does oilfield tank monitoring cost?

The cost of tank monitoring is mostly about what the system asks of you, not just the sticker price. Line items to price out:

• Sensors for each tank you care about.
• The gateway or controller that carries readings off the lease.
• Communications, monthly.
• Software and alerts, monthly.
• Install labor: an electrician, trenching, or an integrator, or none.
• Upkeep: who fixes it when a sensor fails, and what that costs.

TinyPumper’s pricing is simple on purpose: $349 a sensor, one time. Then one flat rate a month per site, unlimited sensors. The client self-installs in 8 minutes. No electrician, no trenching. Every sensor has lifetime hardware replacement, and you have 60 days to try it with your money back if it isn’t worth it.

When is SCADA the right call for tanks?

Sometimes. SCADA earns its keep where a tank needs control, not just eyes:

• Automatic shut-in when a tank hits high level.
• Large facilities where tanks, compression, and safety systems are tied together.
• Custody transfer points that need certified tank gauging.

On a conventional tank battery that needs to be watched, not controlled, SCADA is usually more system than the site needs. That’s where a self-installed monitor fits. Our guide to oil and gas SCADA walks through where the line sits.

What oilfield tank monitoring is not

• It is not custody-transfer gauging. Run tickets still need a measured, witnessed gauge.
• It is not control. A monitor tells you a tank is high. It does not close a valve.
• It is not a home heating oil gauge. Those products are built for one tank in a basement, not a battery of crude and water tanks on a lease.
• It does not replace the pumper. A sensor flags the problem. A pumper still has to fix it.

Who is this not for?

If you need a gauge for a home heating oil tank or a shop fuel tank, this page and this product are not for you. If your sites need automatic shut-in, valve control, or certified custody-transfer gauging, you need SCADA or a dedicated tank gauging system. Midstream terminals and refineries running tank farms on DCS-grade systems are also outside what this page covers.

Where TinyPumper and Greasebook fit

TinyPumper is a self-installed remote monitoring system for producers. A matchbox-sized, solar-powered gateway carries readings from radar tank sensors and pressure sensors on the site, and it watches engine and compressor runtime too. It self-installs in 8 minutes with 100% coverage across the continental US over satellite. Pricing is $349 a sensor, one time, then one flat rate a month per site. Every sensor carries lifetime hardware replacement, and there is a 60-day money-back trial with return shipping paid. It works whether you run a handful of wells or thousands.

Greasebook is the production app pumpers use to record gauges, run tickets, and downtime. Tank monitoring watches the tanks between visits. Greasebook keeps the daily production record clean. Many producers run both. For the full picture of what to watch on a site beyond tanks, see the oilfield monitoring systems guide. Comparing vendors? Our monitoring alternatives breakdown lays them side by side, and produced water operators should read the saltwater disposal monitoring guide.

Frequently asked questions

How can I monitor my oil tank level remotely in the oilfield?

Put a level sensor on each tank, connect it to a gateway that sends readings off the lease, and set alerts that reach your phone. On a producing site, a radar sensor on top of the tank is the most durable choice because it never touches the crude or produced water. TinyPumper does this with one solar gateway per site and a self-install that takes about 8 minutes.

How do oil tank monitors work on a tank battery?

A sensor reads the fluid level in each stock tank and water tank. A gateway on the battery sends those readings out by radio, cellular, or satellite. Software shows the levels and sends an alert when a tank crosses a line you set. The last piece is a person who owns that alert and calls the hauler or sends the pumper before a tank runs over.

What is the best oil tank alarm for an oilfield site?

The best alarm reaches a phone, not just a light on site, lets you set the high and low lines for each tank, and keeps checking between regular readings so a fast-filling water tank doesn’t slip past. Most producers want a high-tank alarm to prevent run-overs and a sudden-drop alarm to catch leaks or loads that weren’t scheduled.

Why is it called a tank battery?

A tank battery is the group of tanks, separators, and treaters on a lease where production from one or more wells is separated and stored. The name comes from the tanks standing in a row, like a battery of equipment. Oil goes to the stock tanks and produced water goes to water tanks, and haulers or pipelines take it from there.

Do I still need a pumper if I monitor my tanks?

Yes. Monitoring covers the hours when nobody is on site, but a pumper still gauges for run tickets, checks equipment, and catches problems no sensor sees, like a bad dump valve, a smell, or a leak on the ground. Most producers find monitoring cuts wasted trips to full or empty tanks, so the pumper spends time on the problems that need a person.