Hydraulic Tank Design, Task & Type.

Basic Design of hydraulic tank or reservoir.

Fig. 9 Hydraulic tank
Fig. 9 Hydraulic tank

Suction Line:

Suction line connects the hydraulic tank to pump. After that hydraulic fluid goes to circuit. Suction pipes generally have larger diameter as compared to return lines.Suction pipes have smaller length so as to facilitate lesser loss and cavitation.

Return Line:

After performing necessary task hydraulic fluid comes back to the tank by return line through return manifold and return filter. The return line end should not be too high from the bottom of the reservoir as too high outlet will cause turbulence to the output flow.Normally the return line ends are taper cut to facilitate the flow direction towards the wall side.This will help the fluid to travel larger distance so that it gets more time to cool.

Access Plate:

Access plate is for cleaning the tank.

Suction Strainer:

It is fitted to the suction line inlet.It provides the filtered fluid to the pump. It normally contains some filtering screens (for particular size particles) which filters the contaminants before it goes to the pump.It is replaced time to time to ensure no blockage and reduced flow.

Baffle Plate: 

Baffle plates are normally the steel plates which are incorporated in the reservoir to divide the fluid into different chambers so that the fluid has to travel through other ways to get to the suction chamber from return flow chamber. As a result, oil gets cool and contaminants set at the bottom of the chamber. It gives the time to hydraulic oil for suppressing, calming and gas purging.


This is the opening for equalisation of air pressure when fluid level change.  A filter for breather protects the fluid from dirts. It is important to understand that too small a breather cap or choked filter will cause a vacuum in the oil tank and cause cavitations in the pumps. So, it need extra care.

Oil level gauge:

In a hydraulic tank a oil level gauge shows the level of oil. commonly there are two lines in gauge. one for high level and one for low level.

Filler cap:

Filler is for top-up the hydraulic oil.

In the next page, you will see Processes in hydraulic tank and combine all tasks of hydraulic tank.

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