Day Tank
A Day Tank is a small-capacity storage tank designed to hold and supply a limited quantity of fuel, chemicals, water, or process liquids for short-term operational use. The end use of the product is usually a generator. The purpose of the day tank is to provide immediate product to the end user, where the supply otherwise would be influenced by product temperature, viscosity, and inadequate supply pressure. A day tank is used to hold and supply a limited quantity of liquid (such as fuel or chemicals) for short-term, daily consumption. A day tank is a small intermediate storage tank used for short-term storage and continuous supply of liquids to the industrial equipment for process systems.
A day tank is typically installed near the equipment, such as generators, boilers, or process systems. To ensure a continuous and reliable supply of fluid without needing direct connection to the main storage tank at all times. It sits between bulk storage (large tanks, tank farms, or delivery trucks) and the point-of-use equipment to provide a reliable, steady feed, conditioning, and safety buffer. It is commonly used to maintain a steady supply of fuel, chemicals, oils, and the process liquids for daily operational requirements. Petron Thermoplast to ensures the quality is 100%. Day Tanks that deliver to consistent performance in demanding environments.
Fuel / Liquid Type
Diesel, Oil, Chemicals, Water
Temperature Resistance
-10°C to 80°C (depends on material used)
Corrosion-Free Construction
No rusting when exposed to chemicals & moisture.
Long Service Life
Excellent durability and can operate for many years
ISO / ASTM / DVS Certified
Manufactured to international quality standards
-10°C to 80°C
Operating Temperature
50 L to 5K L
Capacity (Customizable)
ISO / ASTM / API
Certified quality standards
3 mm to 10 mm
Wall Thickness
Technical Details
| Parameter | Details |
| Material of Construction | Mild Steel (MS), Stainless Steel (SS), HDPE, FRP |
| Capacity Range | 50 Liters to 5,000 Liters (custom sizes available) |
| Shape | Cylindrical (Vertical/Horizontal), Rectangular |
| Wall Thickness | 3 mm to 10 mm (depends on material and capacity) |
| Design Type | Open top / Closed top |
| Fuel / Liquid Type | Diesel, Oil, Chemicals, Water |
| Operating Temperature | -10°C to 80°C (depends on material used) |
| Pressure Rating | Atmospheric (generally not designed for high pressure) |
| Level Control System | Float switch, level sensor, level gauge |
| Inlet Connection | Flanged or threaded connection |
| Outlet Connection | Bottom outlet with valve |
| Overflow Connection | Provided to prevent overfilling |
| Vent Pipe | Included for pressure balance |
| Pump Integration | Transfer pump or dosing pump (optional) |
| Filtration System | Optional fuel filter or strainer |
| Coating / Lining | Anti-corrosion coating or internal lining (for MS tanks) |
| Mounting Type | Skid-mounted / Floor-mounted |
| Stand / Support | MS frame or base support |
| Standards Compliance | As per ISO / ASTM / API standards |
| Safety Features | Level alarms, overflow protection, leak-proof design |
| Accessories | Level indicator, control panel, valves, piping, alarm system |
Chemical compatibility of a day tank refers to the ability of the tank material to safely store fuels, chemicals, oils, or process liquids without corrosion, leakage, deformation, or material failure. Proper compatibility is essential for safe operation, long service life, and reliable industrial performance.
The compatibility depends on:
- Type of liquid
- Chemical concentration
- Operating temperature
- Tank material
- Pressure conditions
Common Materials Used for Day Tanks
| Tank Material | Main Characteristics |
| HDPE | Excellent corrosion resistance, lightweight |
| Polypropylene (PP) | Good chemical and temperature resistance |
| FRP | High structural strength and corrosion resistance |
| Stainless Steel (SS) | Hygienic and durable |
| Mild Steel (MS) | Strong and suitable for fuel storage |
Common Liquids Compatible with Day Tanks
| Liquid Type | Compatible Tank Materials | Typical Applications |
| Diesel Fuel | MS, SS, FRP | Generator systems |
| Fuel Oil | MS, SS | Boiler systems |
| Lubricating Oil | MS, SS, HDPE | Machinery lubrication |
| Hydraulic Oil | MS, SS | Hydraulic systems |
| Sodium Hypochlorite | HDPE, PP, FRP | Water treatment |
| Caustic Soda | HDPE, PP, PVDF | Chemical dosing |
| Hydrochloric Acid | PP, PVDF, FRP | Chemical processing |
| Alum Solution | HDPE, PP | Water treatment plants |
| Ferric Chloride | HDPE, PP, FRP | ETP systems |
| Process Water | HDPE, SS | Industrial applications |
| Detergent Chemicals | HDPE, PP | Cleaning systems |
1. Raw Material Inspection
- Verification of material grade (MS, SS, HDPE, FRP)
- Checking mechanical properties and chemical compatibility
- Ensures compliance with relevant standards (ISO/ASTM/API)
2. Visual Inspection
- Examination for surface defects, dents, cracks, or corrosion
- Inspection of weld joints, edges, and overall finishing quality
3. Dimensional Accuracy Test
- Measurement of thickness, diameter, height, and fittings placement
- Ensures the tank meets design specifications
4. Hydrostatic (Leak) Testing
- The tank is filled with water to check for leaks
- Confirms leak-proof construction and joint integrity
5. Pressure Testing (If Applicable)
- Conducted for tanks designed for slight internal pressure
- Ensures structural strength under operating conditions
6. Weld Quality Testing (For Metal Tanks)
- Non-Destructive Testing (NDT) methods like:
- Dye Penetrant Test (DPT)
- Ultrasonic Testing (UT)
- Ensures strong and defect-free welds
7. Coating & Lining Inspection
- Thickness and adhesion testing of internal/external coatings
- Ensures corrosion resistance, especially for MS tanks
8. Load & Structural Testing
- Evaluates the tank’s ability to withstand operational loads
- Includes support structure and skid strength checks
9. Functional Testing of Components
- Testing of level sensors, float switches, pumps, and alarms
- Ensures proper functioning of control systems
10. Overflow & Safety System Check
- Verification of overflow line, vent pipe, and emergency features
- Prevents overfilling and pressure build-up
Industries We Serve
A day tank is used for short-term storage and continuous supply of fuel, chemicals, oils, and process of liquids in industrial systems. These tanks to help the maintain uninterrupted operations by providing a controlled of daily supply of liquids to equipment and process systems.
Diesel Generator (DG) Systems
Day tanks are widely used in generator applications for:
Daily diesel fuel storage
Continuous fuel supply to DG sets
Emergency power backup systems
Automatic fuel feeding systems
Boiler Fuel Supply Systems
In boiler plants, day tanks are used for:
Fuel oil storage
Diesel supply to burners
Controlled fuel feeding systems
Continuous boiler operation
Water Treatment Plants
Day tanks are commonly used for storing and dosing:
Sodium hypochlorite
Caustic soda
Alum solution
Chlorine chemicals
pH correction chemicals
Effluent Treatment Plants (ETP)
In ETP systems, day tanks are used for:
Chemical dosing operations
Neutralization chemical storage
Coagulant preparation
Flocculant solution storage
Sewage Treatment Plants (STP)
The corrosion-resistant nature of HDPE makes these tanks suitable for:
Saltwater environments
Coastal industrial plants
Marine chemical storage systems
Chemical Processing Industry
Chemical industries use day tanks for:
Intermediate chemical storage
Process liquid feeding
Additive dosing systems
Continuous chemical supply
Lubrication Systems
Day tanks are used for:
Lubricating oil storage
Hydraulic oil supply
Continuous lubrication systems
Industrial machinery operation
Power Plants
Power generation facilities use day tanks for:
Diesel fuel systems
Turbine lubrication oil
Boiler chemical dosing
Fuel oil storage
Marine Industry
Marine applications include:
Engine fuel supply systems
Lubrication oil storage
Auxiliary machinery fuel systems
Emergency fuel storage
Pharmaceutical Industry
Day tanks are used in pharmaceutical plants for:
Process liquid storage
Purified water systems
Chemical preparation systems
Controlled dosing operations
Oil & Gas Industry
In oil & gas operations, day tanks are used for:
Fuel storage systems
Chemical injection systems
Hydraulic oil storage
Process fluid handling
Mining Industry
Mining operations use day tanks for:
Fuel storage
Chemical reagent handling
Hydraulic systems
Process liquid supply
Features of Day Tanks
Short-Term Liquid Storage
Day tanks are specially designed for:
Daily operational liquid storage
Intermediate storage applications
Continuous process supply systems
They provide a steady and controlled liquid supply to industrial equipment.
Continuous Supply Capability
Day tanks ensure uninterrupted supply of:
Diesel fuel
Fuel oil
Chemicals
Lubricants
Process liquid
This improves operational efficiency and reduces downtime.
Compact Design
The compact structure allows:
Easy installation
Space-saving arrangement
Convenient equipment integration
especially in limited industrial spaces.
Strong Structural Construction
Day tanks are manufactured using durable materials such as:
HDPE
Mild Steel (MS)
Stainless Steel (SS)
FRP
Polypropylene (PP)
High mechanical strength
Structural stability
Long service life
Excellent Chemical Resistance
Chemical-grade day tanks offer strong resistance against:
Corrosive chemicals
Acids
Alkalis
Water treatment chemicals
ensuring safe chemical handling.
Leak-Proof Construction
Precision welding and fabrication provide:
Leak-resistant joints
Safe liquid containment
Reliable storage performance
Corrosion Resistance
Depending on material selection, day tanks offer protection against:
Rust formation
Chemical corrosion
Environmental degradation
This reduces maintenance requirements.
Easy Level Monitoring
Day tanks can be equipped with:
Level indicators
Float switches
Sight glass system
Electronic monitoring systems
for accurate liquid level control.
Customizable Design
Day tanks can be customized according to:
Storage capacity
Process requirement
Installation space
Nozzle arrangement
Operating conditions
Multiple Shape Options
Available configurations include:
Vertical tanks
Horizontal tanks
Cylindrical tanks
Rectangular tanks
Depending on application requirements.
Safe Fuel & Chemical Handling
Day tanks provide:
Controlled liquid storage
Safe transfer systems
Reduced spill risk
Improved operational safety
Agitator & Mixer Provision
Chemical dosing day tanks may include:
Agitator mounting
Mixing systems
Chemical blending arrangement for process applications.
Easy Maintenance
The tanks are designed for:
Simple cleaning
Easy inspection
Low maintenance operation
which reduces operational costs.
UV & Weather Resistance
Outdoor day tanks may include:
UV-resistant coating
Weatherproof construction
Environmental protection
for long-term outdoor operation.
High Operational Reliability
Day tanks provide:
Stable liquid supply
Consistent process operation
Reliable industrial performance
Flexible Installation Options
These tanks can be installed:
Indoor
Outdoor
Above ground
On skids or support frames
According to plant layout requirements.
Compatibility with Pumping Systems
Day tanks are compatible with:
Fuel transfer pumps
Dosing pumps
Metering systems
Automation systems
for efficient liquid handling.
Long Service Life
Properly manufactured day tanks offer:
Durable operation
Reduced replacement frequency
Long-term reliability
Manufacturing Process of Day Tank
The manufacturing process of a day tank to involve the careful engineering, material selection, fabrication, welding, assembly, and quality testing to ensure safe and reliable storage of fuels, chemicals, oils, and process liquids. Day tanks are commonly manufactured using to Mild Steel (MS), Stainless Steel (SS), HDPE, PPH, and FRP depending on the application.
The manufacturing process begins with detailed engineering calculations based on:
- Storage capacit y(50 Liters to 5,000 Liters (custom sizes available))
- Type of liquid
- Chemical compatibility
- Operating temperature
- Installation conditions
- Pressure and load requirements
- Tank dimensions
- Wall thickness
- Structural reinforcement
- Nozzle arrangement
The tank material is selected according to the application.
Common materials include:
- Mild Steel (MS)
- Stainless Steel (SS)
- HDPE
- Polypropylene (PP)
- FRP (Fiber Reinforced Plastic)
- Corrosion resistance
- Fuel compatibility
- Chemical resistance
- Mechanical strength
Raw material sheets are cut into required sizes using:
- CNC cutting machines
- Plasma cutting
- Laser cutting
- Circular saws
- Tank shell
- Bottom plate
- Top cover
- Reinforcement components
The cut sheets are rolled into cylindrical or custom shapes using rolling machines.
Common tank configurations:
- Vertical tanks
- Horizontal tanks
- Rectangular tanks
- Accurate dimensions
- Structural alignment
- Uniform shape
Tank sections are joined using suitable welding methods.
Metal Tanks
Common welding methods:
- TIG welding
- MIG welding
- Arc welding
Thermoplastic Tanks
Common welding methods:
- Butt fusion welding
- Extrusion welding
- Hot gas welding
These welding techniques provide:
- Strong joints
- Leak-proof construction
- Structural integrity
The tank bottom and roof sections are attached to the shell body.
Top designs may include:
- Flat top
- Dome top
- Open top
Bottom designs may include:
- Flat bottom
- Sloped bottom
- Conical bottom
Depending on operational requirements.
Various fittings are installed including:
- Inlet nozzles
- Outlet nozzles
- Vent pipes
- Overflow connections
- Drain valves
- Level indicators
- Manholes
These accessories improve tank functionality and safety.
Additional strengthening components may include:
- Reinforcement rings
- Support legs
- Saddle supports
- Structural frames
- FRP lamination (if required)
These supports improve:
- Mechanical strength
- Stability
- Load-bearing capacity
Depending on the application, tanks may receive:
- Anti-corrosion coating
- Epoxy coating
- Chemical-resistant lining
- UV protection coating
- Surface polishing
This improves durability and corrosion resistance.
The completed tank undergoes strict quality testing such as:
- Hydrostatic testing
- Leak testing
- Weld inspection
- Vacuum testing
- Dimensional inspection
These tests ensure safe and reliable performance.
Functional checks may include:
- Level indication testing
- Pump connection verification
- Overflow system testing
- Accessory inspection
Final finishing includes:
- Surface cleaning
- Edge trimming
- Painting or polishing
- Labeling and marking
How to Select the Right Day Tank
The first step is to determine:
- Type of liquid
- Chemical properties
- Corrosive nature
- Viscosity
- Flammability
Common liquids stored in day tanks include:
- Diesel fuel
- Fuel oil
- Lubricating oil
- Hydraulic oil
- Water treatment chemicals
- Process chemicals
The tank material must be compatible with the stored liquid.
Common tank materials include:
- HDPE
- Polypropylene (PP)
- FRP
- Stainless Steel (SS)
- Mild Steel (MS)
- Corrosion
- Leakage
- Material damage
- Operational failure
Tank capacity should be selected based on:
- Daily liquid consumption
- Backup storage requirement
- Equipment operating hours
- Process demand
- Small tanks: 50–500 liters
- Medium tanks: 1 KL–5 KL
- Large systems: 10 KL and above
- Ambient temperature
- Liquid temperature
- Process operating conditions
- Special lining
- Reinforced construction
- Heat-resistant materials
Common tank designs include:
- Vertical tanks
- Horizontal tanks
- Cylindrical tanks
- Rectangular tanks
- Available installation space
- Process requirement
- Ease of maintenance
Indoor Installation
- Reduced UV exposure
- Lower environmental impact
Outdoor Installation
- UV-resistant construction
- Weatherproof design
- Corrosion protection
Most day tanks operate under atmospheric pressure.
- Venting systems
- Overflow protection
- Pressure balancing
- Reinforced tank design
- Vacuum protection
Choose accessories according to operational needs.
Common accessories include:
- Level indicators
- Float switches
- Drain valves
- Vent pipes
- Manholes
- Pump connections
- Overflow nozzles
Ensure the tank is compatible with:
- Fuel transfer pumps
- Dosing pumps
- Metering systems
- Automation controls
Proper nozzle arrangement improves efficiency.
Large day tanks may require:
- Support frames
- Reinforcement rings
- Skid-mounted structures
- External stiffeners
to improve structural stability.
Tank wall thickness depends on:
- Liquid density
- Tank size
- Operating conditions
- Material selection
Proper thickness ensures:
- Mechanical strength
- Safe operation
- Long service life
Important safety features may include:
- Leak-proof construction
- Emergency overflow system
- Flame arrestor (for fuel systems)
- Secondary containment
- Level alarms
Choose tanks manufactured according to:
- ASTM standards
- Industrial fabrication standards
- Welding quality standards
- Hydro testing
- Leak testing
- Weld inspection
Important safety features may include:
- Leak-proof construction
- Emergency overflow system
- Flame arrestor (for fuel systems)
- Secondary containment
- Level alarms
Custom Product Manufacturing Available
If you are searching for customized product designs that meet your requirements, don’t worry. Petron Thermoplast also offers custom product manufacturing services to meet the unique needs of various industries. Work with our expert engineers to create custom designs suited for your application.
Why Choose Petron Thermoplast?
Petron Thermoplast is known for precise manufacturing, quality materials, and adherence to standards. Working with a trusted manufacturer like Petron Thermoplast to ensures the quality is 100%. Day Tanks that deliver to consistent performance in demanding environments. With the experience in producing standard and custom designs, Petron Thermoplast provides solutions tailored to the needs of diverse industries worldwide.
Frequently Asked Questions
A day tank is a small storage tank used to hold and supply fuel or liquid for short-term (daily) use, typically connected to equipment like generators or boilers.
Its main purpose is to ensure a continuous and reliable supply of fuel or liquid to equipment without directly relying on the main storage tank.
Day tanks are commonly used for:
- Diesel fuel
- Furnace oil
- Lubricating oil
- Water or certain chemicals
Capacity usually ranges from 50 liters to 5,000 liters, depending on the application and consumption requirements.
They are widely used in:
- Diesel generator systems
- Boiler fuel systems
- Industrial processing units
- Commercial buildings
Fuel or liquid is transferred from the main storage tank to the day tank. From there, it is supplied directly to the equipment, often using pumps and level control systems.
Common materials include:
- Mild Steel (MS)
- Stainless Steel (SS)
- HDPE
- FRP
Typical safety features include:
- Overflow protection
- Level indicators and alarms
- Vent pipes
- Leak-proof construction
Yes, day tanks can be designed for outdoor use with proper coating, lining, or UV-resistant materials.
- Regular cleaning
- Checking for leaks or corrosion
- Inspection of pumps, valves, and level systems
- Monitoring fuel quality
