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Rotational Moulding - Hydraulic Tank Design.

This article has been written to fuel the imagination of design engineers working on Hydraulic Tanks. One of my clients, a Rotational Moulding manufacturer 'Amber Plastics', has expertise and a great deal of experience in the field. The Article applies my knowledge of industrial design and engineering with their specialist manufacturing expertise to highlight the advantages of Rotational Moulding Hydraulic tanks for industrial machinery, vehicles and construction equipment.


Rotational Moulding hydraulic tank top and filler cap


Hydraulic Tank / Reservoir Design for Rotational Moulding

The rotational moulding of hydraulic tanks can have many benefits, including reducing manufacturing costs and increasing hydraulic system performance whilst giving the designer more freedom. The simplest rotational moulded hydraulic tanks serves the same purpose as conventional, fabricated steel tanks but with substantial manufacturing cost savings.  Rotational moulding really makes a difference when the designer builds in additional benefits, making them more than just a vessel for liquid storage.

Performance and Function Considerations of Hydraulic Tanks

Hydraulic tanks need to contain oil safely over long periods and in all extremes of operating conditions, the tank must prevent contamination.

A hydraulic tank forms part of thermal performance of a hydraulic circuit. At first glance a steel tank will conduct more heat from the oil, but the skilled designer can reverse this.

Hydraulic tanks need to circulate a flow of oil in such a way that all the available oil is used in the regular cycle of the machine's operation. This prevents overuse of a small amount of the available oil.

Hydraulic tanks have an important role in maintaining the condition of the oil. Good oil reduces system and pump wear, increases service intervals whilst maintaining excellent hydraulic performance.

The volume of oil used in the circuit is a factor that affects the thermal performance and oil condition. (Twice the oil halves the problems?).

Hydraulic tanks have to incorporate many fittings; inlets, outlets, filler caps, sight glasses, level floats, mounting points etc.  

All these points give designers scope to create innovative hydraulic tanks. Rotational moulding allows engineers and designers to produce radical designs with improved hydraulic performance, reduced component cost, lower assembly times and increased reliability. All it needs is for engineers to embrace the rotational moulding process and to think outside of the box.


If you have any general comments about this article, please nip over to the idostuff blog.

For specific enquiries about manufacturing a tank or any rotational moulding project, please contact Amber Plastics Ltd (Chesterfield UK) the rotational moulding experts.


Rotational Moulded Tank Images

Internal Threads for a filler cap in a rotational moulding

Internal and external threads can be Rotational Moulded in to make perfect access ports . Metal inserts are moulded in for fittings and mounting points.

Inserts and fittings in a rotational mouldingComplex internal structure of a Rotational Moulding

Almost no limits to external shape and internal details so yes, internal baffles can be moulded.

Rotational Moulding can be complex shape to fitt available space

Where space is tight in a compartment, tanks can be moulded to fit in every available space. Giving the opportunity for increased oil volumes.

Fine surface Detail for extrnal aesthetics

External surfaces can carry fine detail and textures as well as shapes so tanks can form part of the equipment exterior giving the designer scope for some creative aesthetic designs.

Notes on the Rotational Moulding Pictures.

Taken by myself a A.G. Bell copyright 2012. in my capacity as a commercial photographer agbimages. So please don't rob them! If you do want to use them on-line, credit them with a "follow" Link back here.


So another insight in to the stuff that I do, this time in one of my professional capacities.