Custom Rotomolded Vertical Tanks – 250L, 750L & 850L

 

OEM & ODM Polyethylene Tank Manufacturing | Custom Dimensions, Fittings & Support Structures

 

Built Around Your Equipment. Not Just a Standard Tank Size.

 

Not every industrial liquid storage application can be solved with an off-the-shelf plastic tank.

 

Some projects require a narrow tank to fit inside a machine enclosure. Others need a taller storage vessel to make better use of available

 

floor space. Certain applications require a precisely positioned outlet, a customized top opening or a support structure designed around the equipment.

 

At Changzhou Treering Plastics Co., Ltd., we manufacture custom rotationally molded polyethylene tanks for industrial equipment

 

manufacturers, system integrators and OEM product developers.

 

Our vertical tank range includes nominal capacities of 250L, 750L and 850L, with engineering options for alternative dimensions,

 

connection layouts, wall thicknesses and external support frames.

 

Whether you are sourcing an existing configuration or developing a new tank for your equipment, our team can support the manufacturing

 

process from drawing evaluation and mold development to production and inspection.

 

Three standard reference sizes. More possibilities through custom engineering.

 

 

 

1. Three Vertical Tank Sizes for Different Equipment Requirements

 

Our vertical polyethylene tank designs offer different combinations of storage capacity, overall height and floor-space requirements.

 

Rather than selecting a tank based on capacity alone, OEM customers can consider the available installation space, liquid compatibility,

 

filling requirements, outlet position and supporting structure.

 

 

Specification	850L	750L	250L
Nominal capacity	850 L	750 L	250 L
Overall height	2023 mm	1900 mm	1150 mm
Outside diameter	750 mm	710 mm	580 mm
Top opening (drawing)	Ø180 mm	Ø180 mm	Ø180 mm
Neck dimension (drawing)	Ø162.7 mm	162.7 mm	Ø162.7 mm
Material	PE, grade to confirm	PE, grade to confirm	PE, grade to confirm
Manufacturing	Rotational molding	Rotational molding	Rotational molding
Support frame	Custom option	Custom option	Custom option
Wall thickness	4-7 mm	4-9mm	4-9mm

 

 

 

 

250L Compact Vertical PE Tank

 

Designed as a compact reference configuration, the 250L tank is suitable for equipment layouts where installation space is limited.

 

Its relatively small footprint makes it worth considering for auxiliary liquid reservoirs, dosing-system integration, compact industrial process

 

equipment and other custom storage applications.

 

Typical customization enquiries include:

 

• Alternative inlet and outlet locations

• Custom top opening and lid arrangements

• Project-specific wall thickness

• Mounting and support configurations

• Custom tank height or diameter

•  

Best suited for: Compact equipment integration and smaller industrial liquid storage systems, subject to application review.

 

750L Slim Vertical PE Tank

 

The 750L configuration combines a relatively narrow outside diameter with a tall cylindrical body.

 

For equipment manufacturers working within restricted floor-space envelopes, this configuration offers a useful starting point for integrating

 

higher liquid storage capacity.

 

Potential applications include industrial liquid handling, process equipment reservoirs, water-treatment system integration and customized

 

chemical storage assemblies.

 

Engineering options may include:

 

• Custom connection sizes and positions

• Alternative lid arrangements

• Application-specific polyethylene grades

• External ste

• el support frames

• Equipment-specific mounting provisions

•  

Best suited for: Taller industrial equipment installations and applications requiring a relatively compact footprint.

 

850L Large Vertical PE Tank

 

 

The 850L model is the largest of the three reference configurations.

 

Its taller body and increased outside diameter provide a starting point for industrial liquid storage applications requiring greater nominal

capacity.

 

For OEM projects, the design can be reviewed alongside custom inlet and outlet arrangements, material selection, wall thickness

 

requirements and external structural support.

 

Potential project applications include liquid storage within water-treatment equipment, chemical processing systems and industrial

 

machinery.

 

Best suited for: Larger integrated equipment and customized industrial storage projects

.

 

 

2. Custom Tank Manufacturing Starts with the Installation Requirements

Your Equipment Defines the Tank — Not the Other Way Around.

 

A standard storage vessel may fit the required liquid volume but fail to meet the actual installation requirements.

 

A tank may be too wide for a machine enclosure, too tall for an installation area, or have an outlet positioned where maintenance access is

 

difficult.

 

This is where custom rotational molding becomes valuable.

 

Instead of asking customers to redesign their equipment around a stock tank, we can review the tank geometry and manufacturing

 

requirements around the intended installation.

 

 

Diameter and Height Customization

 

Available installation space often determines the basic tank geometry.

 

We can evaluate requests for alternative tank diameters, overall heights, shoulder profiles and bottom configurations.

 

When the requested dimensions differ significantly from an existing mold, a new mold or tooling modification may be necessary.

 

Inlet and Outlet Customization

 

Tank connections should be designed around the equipment's pipework, filling method and maintenance requirements.

 

We can review:

 

• Top filling openings and threaded lids

• Side or lower outlet positions

• Alternative outlet diameters

• Threaded connections and compatible fittings

• Bosses and reinforced connection areas

• Additional access or inspection openings

•  

Connection designs are reviewed for manufacturability, sealing requirements and the intended operating conditions.

 

Wall Thickness Customization

 

Wall thickness is not simply a number selected from a catalog.

 

It should reflect tank geometry, liquid density, operating temperature, installation method and expected service conditions.

 

Our manufacturing process allows wall thickness requirements to be considered during product development, with particular attention to

 

areas around corners, transitions, openings and other critical features.

 

Final wall thickness targets, tolerances and inspection methods should be agreed upon before production.

 

Custom Material and Color Options

 

Polyethylene material selection can be adapted to the intended application.

 

Depending on compatibility and processing requirements, suitable rotational-molding-grade polyethylene materials may be evaluated,

 

including rotational-molding-grade LLDPE.

 

Natural translucent and custom-colored configurations can also be discussed.

 

Material compatibility, UV exposure, temperature conditions and regulatory requirements should be established before selecting the final

 

grade.

External Support Frame Customization

 

Certain industrial tank installations require a dedicated supporting structure.

 

We can review projects involving custom-designed metal frames, mounting arrangements and equipment-specific support configurations.

 

Frame design should consider the filled tank weight, load transfer, maintenance access and installation environment.

 

Any steel support structure requires separate engineering approval for the specified loading conditions.

 

 

3. Why Rotational Molding for Custom Industrial Tanks?

One-Piece Hollow Construction

 

Rotational molding is a manufacturing method used to form hollow plastic products within a heated rotating mold.

 

For suitable tank geometries, the process allows the main tank body to be manufactured as a single molded hollow component.

 

This can reduce the need for separately welded panels or multiple joined wall sections.

 

Flexible Product Geometry

 

Unlike a simple cylindrical container made to a fixed stock specification, a custom rotomolded tank can be developed around equipment-

specific geometry.

 

Potential design features include shaped shoulders, recessed connection areas, molded bosses, mounting provisions and other functional

 

details.

 

Every feature must be assessed for tooling, demolding and consistent production.

 

Suitable for OEM Product Development

 

Rotational molding is particularly relevant when an OEM manufacturer needs a hollow plastic component with customized geometry and

 

tooling dedicated to its product.

 

Once the design is finalized and the mold has been validated, the component can be manufactured according to the agreed production

 

specification.

 

Material and Process Engineering

 

Material performance depends on the selected polyethylene grade, processing conditions, final wall thickness and the application

 

environment.

 

We evaluate manufacturing feasibility alongside the product's intended functional requirements rather than treating every tank application

 

as identical.

 

 

4. Applications for Custom Rotomolded Vertical Tanks

 

Water Treatment and Filtration Equipment

 

Vertical tanks can be integrated into selected water-treatment systems for holding process liquids, subject to the required material,

 

connection and operating specifications.

 

OEM customization can help accommodate system layout, pipework routing and restricted installation space.

 

Industrial Chemical Dosing Systems

 

For compatible chemicals, vertical PE tanks may serve as storage vessels within chemical dosing equipment.

 

Connection positions, material compatibility, installation environment and secondary containment requirements should be evaluated during

design.

 

Suitability for a specific chemical must be verified rather than assumed from the tank material alone.

 

Industrial Machinery and Process Equipment

 

Equipment manufacturers often need reservoirs that are shaped around surrounding machinery.

 

Custom tank geometry can support compact machine layouts and equipment-specific connection requirements.

 

Agricultural and Fertilizer Handling Systems

 

With appropriate chemical compatibility assessment, polyethylene reservoirs can be considered for agricultural liquid handling, fertilizer

 

preparation and auxiliary process equipment.

 

OEM Replacement and New Product Development

 

For equipment manufacturers developing a new product or updating an existing design, a custom tank can be engineered around revised

 

dimensional and connection requirements.

 

This may involve modifying existing tooling or manufacturing a new custom mold.

 

 

5. From CAD Drawing to Finished Tank — Our OEM Manufacturing Process

 

Step 1. Application and Drawing Review

 

Send us your proposed tank dimensions, 2D drawings, 3D files, reference photographs or equipment installation requirements.

 

We review the general product geometry, connection positions, intended material, wall thickness requirements and manufacturing feasibility.

 

Step 2. Design for Rotational Molding

 

Before tooling, the design is reviewed for features relevant to rotational molding, including mold release, access openings, geometric

 

transitions and areas requiring careful wall thickness control.

 

Where necessary, we discuss practical adjustments with the customer.

 

Step 3. Mold Development

 

Depending on the product geometry, size, tooling budget and production needs, we evaluate an appropriate mold construction approach.

 

Custom tooling is developed against the agreed drawings and production requirements.

 

Step 4. Sample Production and Evaluation

 

Initial molded samples are evaluated against the agreed specification.

 

Dimensional measurements, functional fit and any necessary connection or leakage checks can be defined in the project inspection plan.

 

Step 5. Production and Quality Inspection

 

After sample approval, production is carried out using the approved material and process requirements.

 

Relevant inspection checkpoints can include visual condition, critical dimensions, connection areas and wall thickness measurements.

 

Step 6. Packaging and Export Delivery

 

Finished products are packed according to the project requirements, taking into account their dimensions, fitted components and

 

transportation conditions.

 

We support international OEM orders and can discuss suitable export packaging and delivery terms.

 

 

6. Real Manufacturing. Real Equipment. Real Products.

 

Manufactured by Changzhou Treering Plastics Co., Ltd.

 

We are a China-based plastic manufacturing company serving OEM and industrial customers.

 

Our manufacturing activities include rotational molding and the development of custom hollow plastic components.

 

Our factory photographs show actual rotational molding equipment, molded industrial products and finished polyethylene tanks.

 

For customers sourcing industrial tanks overseas, direct communication with a manufacturing team can help simplify design evaluation,

 

tooling discussion and production coordination.

 

Rather than presenting only a catalog of available containers, we focus on understanding the product customers need to manufacture.

 

Our objective is to turn practical industrial requirements into manufacturable plastic components.

 

 

7. Quality Considerations for Custom Polyethylene Tanks

 

Industrial tanks should be evaluated according to their intended use.

 

Important quality considerations may include:

 

Dimensional Accuracy: Verifying critical dimensions required for equipment installation.

 

Wall Thickness: Checking specified locations and important transition areas according to the agreed inspection plan.

 

Connection Integrity: Evaluating outlet installation, fitting compatibility and sealing methods.

 

Material Identification: Confirming that the material used matches the approved project specification.

 

Leakage Inspection: Performing appropriate checks where required by the application and agreed acceptance criteria.

 

Visual Inspection: Identifying relevant molding defects or surface issues before shipment.

 

Test methods and acceptance limits should be specified for each project. A standard manufacturing inspection does not replace chemical

 

compatibility testing, structural validation or regulatory certification when those are necessary.

 

 

8. OEM & ODM Rotomolding Services

 

Need a Tank That Does Not Exist in a Standard Catalog?

 

We welcome enquiries from businesses developing new equipment, modifying existing products or sourcing custom plastic components.

 

Our manufacturing discussions can cover:

 

• Custom plastic tank design and dimensional changes

• New rotational molding tooling

• Custom polyethylene material selection

• Molded connection features and fitting arrangements

• Application-specific tank structures

• Custom support frame coordination

• Prototype and sample evaluation

• Repeat production for approved OEM projects

•  

Whether the starting point is an engineering drawing, an existing product or a concept for a new industrial application, we can review the

 

manufacturing requirements.

 

 

9. Frequently Asked Questions

 

Can you manufacture custom tank sizes beyond 250L, 750L and 850L?

 

Yes. These three capacities are reference configurations. Other sizes can be evaluated according to the requested geometry, equipment

 

requirements and molding feasibility. New tooling may be required.

 

Can the tank diameter and height be changed?

 

Yes. Tank diameter and height can be considered during custom design. The feasibility and tooling implications depend on the extent of the

 

changes.

 

What material do you use for these tanks?

 

Polyethylene is the proposed material family. The final rotational-molding grade, including whether an LLDPE formulation is appropriate,

 

must be selected according to the application and manufacturing specification.

 

Can you produce tanks for chemical storage?

 

We can evaluate industrial chemical storage tank projects. However, chemical compatibility must be verified against the exact substance,

 

concentration, temperature and service conditions. We do not assume that a polyethylene tank is suitable for every chemical.

 

Can you change the position of the inlet or outlet?

 

Yes. Alternative connection locations can be reviewed during product development. Some modifications may require tooling changes,

 

molded bosses or additional fitting provisions.

 

Can the tanks be supplied with steel support frames?

 

Custom support frame configurations can be discussed. Material, fabrication, load rating and mounting details must be confirmed

 

separately for the project.

 

Can you customize the wall thickness?

 

Yes. Wall thickness targets can be specified and evaluated during product development. Feasibility, tolerances and inspection requirements

 

depend on the geometry and operating conditions.

 

Are these tanks suitable for pressurized applications?

 

These reference configurations should not be assumed to be pressure-rated. Pressure or vacuum service would require separate

 

engineering design, validation and applicable compliance assessment.

 

Can you manufacture a tank from our existing drawings?

 

Yes. You can submit 2D or 3D drawings for manufacturing review. The team can assess molding feasibility, required tooling and production

 

considerations.

 

Can you support prototype development before mass production?

 

Custom tooling and sample production can be discussed as part of an OEM development project. The sample approval process should be

 

agreed before commercial production.

 

Can you supply replacement tanks for existing equipment?

 

We can evaluate replacement tank projects where sufficient dimensional information, reference samples or engineering drawings are

 

available. Fit and functional requirements must be checked against the existing equipment.

 

Do you offer factory-direct manufacturing for international OEM customers?

 

Yes. Changzhou Treering Plastics works with industrial customers on custom plastic manufacturing and export projects. Quotation and

 

delivery arrangements are discussed according to the specific requirements.

 

 

10. Start Your Custom Rotomolded Tank Project

 

Looking for a Manufacturer, Not Just a Tank Supplier?

 

If your project requires a unique tank diameter, special connection positions, a tailored support structure or new rotational molding tooling,

 

our team can review your requirements.

 

Send us:

1. Required tank capacity and dimensions

2. Intended liquid and operating conditions

3. Preferred material and wall thickness, if specified

4. Inlet, outlet and fitting requirements

5. Drawings, photographs or reference samples

6. Estimated order quantity and delivery destination

 

Changzhou Treering Plastics Co., Ltd.

Custom Rotational Molding | OEM & ODM Plastic Manufacturing