Hydraulic Reservoir Tank | Roll Forming Machine Hydraulic System

A hydraulic reservoir tank is a fluid storage container used to hold hydraulic oil for the hydraulic power unit (HPU).

Hydraulic Reservoir Tank

1. Technical Definition

A hydraulic reservoir tank is a fluid storage container used to hold hydraulic oil for the hydraulic power unit (HPU). It supplies oil to the hydraulic pump and allows returning fluid from the system to cool, settle, and release trapped air.

The reservoir acts as the central storage and conditioning point for hydraulic fluid in a machine's hydraulic system.

In roll forming machines, hydraulic reservoirs support systems used for:

• Flying cutoff shear units

• Hydraulic punching stations

• Pressing mechanisms

• Hydraulic actuators

• Servo-hydraulic control systems

The tank ensures a continuous and stable supply of hydraulic fluid for machine operation.

2. Where It Is Located

Hydraulic reservoir tanks are typically installed within or beneath the hydraulic power unit assembly.

Common installation locations include:

• Inside the hydraulic power unit frame

• Adjacent to the roll forming machine

• Under hydraulic cutting systems

• Near punching and press units

• Inside hydraulic equipment cabinets

The tank is connected to the hydraulic pump and return lines.

3. Primary Functions

3.1 Store Hydraulic Fluid

The reservoir holds the hydraulic oil required for system operation.

3.2 Supply Oil to the Pump

The pump draws hydraulic fluid directly from the reservoir.

3.3 Allow Fluid Cooling

Returning oil cools naturally inside the reservoir before recirculation.

3.4 Remove Air and Contaminants

The reservoir allows air bubbles and debris to settle out of the fluid.

4. How It Works

The hydraulic reservoir operates as part of the hydraulic circulation system.

Typical process:

1. Hydraulic oil is stored inside the reservoir.

2. The hydraulic pump draws oil from the tank.

3. Pressurized oil is sent through hydraulic valves and actuators.

4. Used oil returns through return lines.

5. The oil re-enters the reservoir where it cools and de-aerates.

This cycle repeats continuously during machine operation.

5. Types of Hydraulic Reservoir Tanks

Welded Steel Reservoir

The most common design used in industrial hydraulic systems.

Integrated HPU Reservoir

Built directly into the hydraulic power unit frame.

Modular Hydraulic Tank

Separate tanks used with large hydraulic systems.

Aluminum Reservoir

Used in lightweight hydraulic systems.

6. Construction & Materials

Hydraulic reservoirs are designed for durability and fluid compatibility.

Common materials include:

• Carbon steel plate

• Stainless steel

• Aluminum alloys

• Powder-coated steel

Important structural components include:

• Main tank body

• Pump suction port

• Return oil inlet

• Inspection cover

• Mounting brackets

These materials ensure structural strength and fluid containment.

7. Design Considerations

Engineers consider several factors when designing hydraulic reservoirs.

Important considerations include:

• Fluid capacity requirements

• Pump flow rate

• Oil cooling requirements

• Contamination control

• Maintenance accessibility

Proper sizing ensures stable hydraulic system performance.

8. Load & Stress Conditions

Hydraulic reservoir tanks must withstand:

• Continuous fluid pressure fluctuations

• Thermal expansion of hydraulic oil

• Industrial vibration

• Mechanical loading from mounted components

Industrial tanks are designed for long-term operation.

9. High-Speed Production Considerations

High-speed roll forming machines require stable hydraulic pressure. Proper reservoir capacity ensures consistent oil supply to the hydraulic pump.

10. Heavy Gauge Applications

Heavy gauge roll forming machines often require larger hydraulic reservoirs due to higher oil flow demands.

11. Light Gauge Applications

Light gauge roll forming machines typically use smaller reservoirs due to lower hydraulic demand.

12. Common Failure Causes

Hydraulic reservoir tanks may fail due to:

• Internal contamination buildup

• Corrosion of tank walls

• Oil leakage at fittings

• Structural fatigue or cracks

Regular inspection helps maintain system reliability.

13. Symptoms of Reservoir Issues

Technicians may observe:

• Low hydraulic oil levels

• Oil contamination

• Excessive oil temperature

• Hydraulic pump cavitation

These symptoms may indicate reservoir problems.

14. Installation Requirements

Proper installation of hydraulic reservoirs includes:

• Mounting the tank securely within the HPU frame

• Connecting suction and return lines

• Installing breather caps and filters

• Filling the tank with the correct hydraulic oil

Correct installation ensures proper hydraulic system operation.

15. Maintenance Requirements

Routine maintenance should include:

• Checking hydraulic oil levels

• Inspecting the tank for leaks

• Cleaning internal contamination

• Replacing breather filters

Regular maintenance improves hydraulic system reliability.

16. Typical Replacement Cost

Hydraulic reservoir tank costs vary depending on size and construction.

Typical price ranges include:

Small hydraulic tank
$200 – $600

Medium industrial reservoir
$600 – $2,000

Large heavy-duty reservoir
$2,000 – $6,000+

Costs depend on tank capacity and material.

17. Safety Considerations

Damaged or leaking reservoirs may lead to:

• Hydraulic oil leakage

• Reduced system pressure

• Environmental contamination

• Fire hazards from oil exposure

Proper tank maintenance ensures safe hydraulic system operation.

18. Role in Roll Forming Machine Assemblies

Hydraulic reservoir tanks support hydraulic systems used in roll forming machines including:

• Hydraulic cutting systems

• Punch press units

• Hydraulic pressing mechanisms

• Servo-hydraulic actuators

• Hydraulic power unit assemblies

They provide fluid storage and conditioning for the machine hydraulic system.

Engineering Summary

The hydraulic reservoir tank is a fluid storage container that holds and conditions hydraulic oil for the hydraulic power unit.

It:

• Stores hydraulic fluid

• Supplies oil to the pump

• Allows cooling and air separation

• Helps remove contaminants

• Supports stable hydraulic system operation

Hydraulic reservoir tanks are critical components in roll forming machines, ensuring reliable hydraulic pressure for cutting, punching, and pressing operations.

Technical FAQ

What is a hydraulic reservoir tank?

It is a tank used to store hydraulic oil for the machine's hydraulic system.

Why is a reservoir important in roll forming machines?

It supplies hydraulic fluid and helps cool and condition the oil.

Where is the hydraulic reservoir located?

It is typically installed within the hydraulic power unit assembly.

What materials are hydraulic reservoirs made from?

Most are made from welded steel or aluminum.

What happens if the reservoir oil level is low?

The hydraulic pump may cavitate, causing system damage.