Day Tank
Day Tanks: Reliable Fuel Supply for Generators
Definition
“A tiny fuel storage tank from which the generator draws its immediate fuel supply, usually containing 6-10 hours of fuel.”
A day tank is a small, auxiliary fuel tank that provides a steady and immediate fuel supply to a diesel generator. It is typically refilled from a main fuel storage tank and ensures that the generator has a continuous fuel source for short-term operation.
Why Are Day Tanks Important in Generator Systems?
1. Provides Immediate Fuel Supply
- Ensures the generator has 6-10 hours of fuel available at all times.
2. Improves Fuel Management
- Prevents direct fuel draw from bulk storage, reducing contamination risks.
3. Enhances Generator Reliability
- Reduces the risk of fuel starvation due to pump or supply line failures.
4. Supports Automatic Fuel Transfer
- Works with fuel transfer pumps and control systems for automated refilling.
How a Day Tank Works
- Receives fuel from the main storage tank via a fuel transfer pump.
- Maintains a set fuel level using float switches or sensors.
- Feeds fuel to the generator’s engine, ensuring a steady supply.
- Refills automatically when fuel levels drop below a pre-set threshold.
Types of Day Tanks
| Type | Function | Common Use |
|---|---|---|
| Gravity-Fed Day Tank | Uses gravity to supply fuel to the generator. | Small generators, low-flow systems. |
| Pump-Fed Day Tank | Uses a transfer pump for fuel delivery. | Large standby generators. |
| Sub-Base Day Tank | Built into the generator’s frame for space efficiency. | Compact generator installations. |
| Heated Day Tank | Prevents fuel gelling in cold climates. | Extreme weather conditions. |
Typical Use Cases
- Hospitals & Data Centres – Ensures emergency power availability.
- Industrial & Commercial Generators – Provides stable fuel flow for long-term reliability.
- Remote & Off-Grid Locations – Supports power systems with limited fuel access.
Key Points
Day tanks play a critical role in generator fuel management, ensuring a steady, clean, and reliable fuel supply. Whether for standby power, industrial applications, or off-grid setups, a well-designed day tank improves efficiency, safety, and generator performance.
