It’s one of the most common and misunderstood questions in the pump world:
“Can I run this pump dry?”
The short answer: Most pumps should not be run dry—and doing so can cause serious damage.
Running a pump without fluid (known as “dry running”) may seem harmless at first, but in many cases, it leads to overheating, seal failure, internal damage, and unplanned downtime. Let’s explore which pumps can handle dry running (and for how long), and which absolutely cannot.
Why Is Dry Running a Problem?
Most pumps depend on the fluid they’re moving to perform key functions like:
- Cooling internal parts
- Lubricating mechanical seals or bearings
- Providing a pressure seal
When fluid isn’t present:
- Mechanical seals overheat and crack
- Impellers or rotors seize
- Casings can warp or even melt (in severe cases)
This kind of damage can happen within seconds.
Pumps That Should NOT Be Run Dry
These pump types rely heavily on the pumped fluid to operate safely and efficiently:
Centrifugal Pumps
These require priming and fluid lubrication for the seal. Running dry can cause immediate seal damage and cavitation.
Magnetic Drive Pumps
While these are seal-less and leak-free, they rely on the pumped fluid to cool internal components and the magnetic coupling. Dry running can destroy the containment shell or magnets.
Mechanical Seal Pumps
Whether gear, end-suction, or multistage pumps, dry running damages the seal faces rapidly due to lack of lubrication.
Progressive Cavity Pumps
These pumps must never be run dry.
Their rubber stator depends on fluid for cooling and lubrication. Dry running can burn or tear the stator within minutes, leading to costly repairs.
Pumps That Can Run Dry
There are only a few types of pumps that tolerate or are designed for dry-run conditions:
Peristaltic Hose Pumps
These are 100% dry-run capable. Since fluid is fully contained inside a reinforced hose and moved by rollers or shoes, there are no internal components needing lubrication from the fluid.
Air Operated Double Diaphragm Pumps (AODD)
Most AODD pumps can run dry without damage. This makes them ideal for intermittent transfer, tank emptying, and mobile setups.
Always check the manufacturer’s guidance. Some diaphragm models may have limits or optional sensors for added protection.
How to Prevent Dry Running Damage
Even if you don’t expect to run dry, accidental dry running is common during:
- Startup (forgetting to open a valve)
- Suction line blockages
- Empty supply tanks
- Leaking foot valves or prime loss
Protect your pump with:
- Level switches or float sensors
- Flow or pressure switches
- Pump controllers with dry-run protection modes
- Operator training on priming procedures
Final Thoughts
Dry running might seem harmless, but for most pump types—especially progressive cavity, centrifugal, and magnetic drive pumps—it’s a fast track to damage and downtime.
If your application involves intermittent flow, suction uncertainty, or tank emptying, be sure to choose a pump that’s designed for those conditions—or protect your system with the right controls.
Need help selecting a dry-run capable pump?
Contact The Pump Expert—we’ll help you make the right call for your fluid, system, and budget.
