Rectangular Process Tank

A Rectangular Process Tank is a specially fabricated industrial tank with a rectangular shape. Rectangular Process Tanks are designed for storing, mixing, processing, and handling liquids, chemicals, water, and industrial solutions. In the various manufacturing and processing operations. Rectangular process tanks are widely used in industries where space optimization, efficient liquid handling, and customization to process the systems are required. The rectangular design allows maximum utilization of available floor space and easy integration into industrial processing lines.

A Rectangular Process Tank is a four-sided and flat walled container. Rectangular Process Tanks are used for storing, mixing, treating liquids, chemicals, or slurries across industrial applications. Rectangular Process Tanks are commonly constructed from thermoplastics (PPH, HDPE) for corrosion resistance. Petron Thermoplast has a strong technical team and maintains close communication and cooperation with international advanced counterparts, so that our products and technologies have always been at the forefront of the world.

Excellent Chemical Resistance

Suitable for chemicals, acids, alkalis, water, and industrial liquids

Temperature Resistance

-10°C to 120°C (depends on material and application)

UV Resistance

UV-stabilized materials available for outdoor applications

Long Service Life

Excellent durability and can operate for many years

ASTM, ASME, ISO, DIN Certified

Manufactured to international quality standards

-10°C to 120°C

Operating Temperature

100 L – 100K L

Capacity (Customizable)

ASTM, ASME, ISO, DIN

Certified quality standards

5 mm – 50 mm

Wall Thickness

Technical Details

Parameter	Technical & Physical Details
Product Name	Rectangular Process Tank
Material Options	HDPE, PPH, FRP, PVC, PVDF, Stainless Steel, Rubber-Lined Steel
Tank Shape	Rectangular / Square
Tank Type	Open Top / Closed Top
Storage Capacity	100 Liters to 100,000+ Liters
Wall Thickness	5 mm to 50 mm (depending on capacity & application)
Design Standard	ASTM, ASME, ISO, DIN Standards
Operating Temperature	-10°C to 120°C (depends on material and application)
Pressure Rating	Atmospheric to customized pressure rating
Chemical Compatibility	Suitable for chemicals, acids, alkalis, water, and industrial liquids
Corrosion Resistance	Excellent resistance to corrosive chemicals
Density of Material	HDPE: 0.94–0.97 g/cm³, PP: 0.90–0.91 g/cm³, FRP: 1.5–2.0 g/cm³
UV Resistance	UV-stabilized materials available for outdoor applications
Color Options	Natural, Black, White, Grey, Customized
Mounting Type	Ground Mounted / Skid Mounted
Inlet Connection	Top inlet / Side inlet
Outlet Connection	Flanged, Threaded, Socket Weld
Lining Options	PTFE, Rubber, FRP, HDPE, PVDF
Reinforcement	FRP reinforcement / Steel support structure
Fabrication Method	Extrusion welding, Butt welding, Fabrication
Surface Finish	Smooth internal finish / Anti-corrosive finish
Leak Protection	Leak-proof welded construction
Ventilation Provision	Optional vent and pressure release system
Level Indicator	Optional level gauge installation
Agitator Provision	Available on request
Manhole Provision	Customized manhole options available
Drainage System	Bottom drain outlet available
Impact Resistance	High impact and abrasion resistance
Thermal Stability	Suitable for moderate to high temperature operations
Mechanical Strength	High structural and load-bearing strength
Safety Features	Anti-corrosion, UV protection, chemical resistance
Maintenance Requirement	Low maintenance
Service Life	Long operational life
Applications	Chemical processing, water treatment, electroplating, pickling, and industrial processing
Installation Type	Indoor & Outdoor installation
Customization	Available as per customer requirements

Chemical compatibility is one of the most important factors when selecting a rectangular process tank. It refers to the ability of the tank material to safely store, process, or handle the chemicals without corrosion, swelling, cracking, leakage, or structural damage.

Proper chemical compatibility ensures:

Safe operation
Long service life
Reduced maintenance
Leak-free performance
Reliable process efficiency

Common Materials Used for Rectangular Process Tanks

Material	Chemical Resistance
Polypropylene (PP)	Excellent resistance to acids and alkalis
HDPE	Good resistance to many chemicals
FRP	Excellent structural and corrosion resistance
PVDF	Superior resistance to highly aggressive chemicals
Stainless Steel	Suitable for selected chemicals and hygienic applications

Compatibility with Common Chemicals

Chemical	PPH	HDPE	FRP	PVDF	Stainless Steel
Hydrochloric Acid (HCl)	Excellent	Good	Excellent	Excellent	Poor to Moderate
Sulfuric Acid (H₂SO₄)	Excellent	Good*	Excellent	Excellent	Good*
Nitric Acid (HNO₃)	Good	Moderate	Good	Excellent	Good
Phosphoric Acid	Excellent	Excellent	Excellent	Excellent	Good
Sodium Hydroxide (NaOH)	Excellent	Excellent	Good	Excellent	Moderate
Potassium Hydroxide (KOH)	Excellent	Excellent	Good	Excellent	Moderate
Sodium Hypochlorite	Good	Excellent	Good	Excellent	Poor
Ferric Chloride	Excellent	Good	Excellent	Excellent	Poor
Alum Solution	Excellent	Excellent	Excellent	Excellent	Good
Process Water	Excellent	Excellent	Excellent	Excellent	Excellent

Quality inspection and testing of a rectangular process tank are essential to ensure structural integrity, leak-proof performance, chemical resistance, and long-term reliability. Since these tanks are often used for chemical processing, water treatment, pickling, electroplating, and industrial applications, stringent quality control measures are required throughout the manufacturing process.

1. Raw Material Inspection

Before fabrication, all raw materials are inspected to verify:

Material grade and specification
Sheet thickness
Surface quality
Chemical resistance properties
Manufacturer certifications

Materials commonly inspected include:

Polypropylene (PP)
HDPE
FRP components
PVDF lining materials
Stainless Steel sheets

2. Dimensional Inspection

Dimensions are checked against approved drawings to ensure manufacturing accuracy.

Parameters inspected include:

Inspection Item	Purpose
Length	Verify design dimensions
Width	Ensure process compatibility
Height	Confirm storage capacity
Wall Thickness	Verify structural strength
Nozzle Position	Ensure proper piping alignment

3. Welding Inspection

Weld quality is critical for tank performance.

Thermoplastic Tanks

Inspection includes:

Butt fusion weld examination
Extrusion weld inspection
Hot gas weld quality checks

Stainless Steel Tanks

Inspection includes:

TIG/MIG weld evaluation
Weld penetration verification
Surface finish inspection

Quality welds ensure:

Leak-proof joints
Structural integrity
Long service life

4. Visual Inspection

A thorough visual inspection is conducted to identify:

Surface defects
Cracks
Weld imperfections
Material damage
Fabrication irregularities

This is one of the first and most important quality checks.

5. Hydrostatic Leak Testing

Hydrostatic testing is performed by filling the tank with water and holding it for a specified period.

The test verifies:

Leak-proof construction
Weld integrity
Structural stability
Resistance to deformation

Any leakage or abnormal deformation results in corrective action.

6. Spark Testing (Holiday Testing)

For lined or laminated tanks, spark testing is used to detect:

Pinholes
Lining defects
Surface discontinuities
Imperfections in protective layers

Commonly applied to:

PVDF-lined tanks
FRP-lined tanks
Protective coating systems

7. Thickness Measurement

Thickness is measured using calibrated instruments to verify:

Wall thickness
Lining thickness
Reinforcement thickness

This ensures compliance with design requirements and safety factors.

8. Structural Strength Inspection

Rectangular tanks experience significant wall stress due to flat surfaces.

Structural inspection evaluates:

Reinforcement ribs
Support frames
Stiffeners
Welded supports
Tank rigidity

This confirms the tank can safely withstand operational loads.

9. Nozzle & Fitting Inspection

All installed accessories are checked for:

Proper positioning
Welding quality
Leak-proof connections
Dimensional accuracy

Common fittings inspected include:

Inlet nozzles
Outlet nozzles
Drain connections
Overflow nozzles
Vent pipes

10. Agitator Support Inspection

For tanks with mixers or agitators, inspections verify:

Mounting strength
Alignment accuracy
Structural reinforcement
Mechanical stability

This prevents vibration-related failures.

Industries We Serve

Features of Rectangular Process Tanks

Manufacturing Process of Rectangular Process Tank

The manufacturing process of a rectangular process tank involves detailed engineering, precision fabrication, welding, reinforcement, assembly, and quality testing to ensure the safe and reliable operation in industrial applications. These tanks are commonly used for chemical processing, water treatment, electroplating, pickling, dosing, and various industrial processes.

Stage 1

Design & Engineering

The manufacturing process begins with detailed design calculations based on:

- Process application
- Chemical compatibility

Tank capacity (100 Liters to 100,000+ Liters)

Operating temperature (-10°C to 120°C (depends on material and application))

Liquid density
Structural load requirements
Tank dimensions
Wall thickness
Reinforcement requirements
Nozzle locations
Support structure design

Stage 2

Material Selection

The tank material is selected according to:

Chemical resistance requirements
Operating temperature
Mechanical strength
Process conditions

Common Materials Used

PPH sheets
HDPE sheets
FRP materials
PVDF lining sheets
Stainless Steel plates

Proper material selection ensures durability and corrosion resistance.

Stage 3

Sheet Cutting & Preparation

Raw material sheets are cut to required dimensions using:

CNC cutting machines
Circular saws
Laser cutting systems
Thermoplastic fabrication equipment
Side walls
Bottom panel
Top cover
Reinforcement strips
Support sections

Stage 4

Panel Fabrication

Individual panels are prepared and machined according to design specifications.

This includes:

Edge preparation
Alignment marking
Hole cutting for nozzles
Reinforcement positioning

Accurate fabrication ensures proper assembly.

Stage 5

Tank Assembly

The bottom panel and side walls are assembled into the rectangular configuration.

The assembly process ensures:

Accurate dimensions
Proper alignment
Structural stability

Temporary supports may be used during fabrication.

Stage 6

Welding & Joint Fabrication

The panels are joined using suitable welding techniques.

Thermoplastic Tanks

Common methods:

Butt fusion welding
Extrusion welding
Hot gas welding

Stainless Steel Tanks

Common methods:

TIG welding
MIG welding
Arc welding

These methods provide:

Strong joints
Leak-proof seams
Long-term durability

Stage 7

Structural Reinforcement

Rectangular tanks require reinforcement because flat walls experience higher stress.

Common reinforcement methods include:

External ribs
PP stiffeners
Steel support frames
FRP reinforcement
Cross braces

Structural strength
Wall stability
Load-bearing capacity

Stage 8

Nozzle & Accessory Installation

Required fittings are installed, including:

Inlet nozzles
Outlet nozzles
Overflow connections
Drain nozzles
Vent pipes
Level indicators
Sampling ports

The fittings are welded and sealed carefully.

Stage 9

Agitator & Equipment Support

For mixing applications, the tank may be equipped with:

Agitator mounting plates
Motor support structures
Mixer reinforcements

This ensures safe operation under dynamic loads.

Stage 8

Lining or FRP Lamination

For highly corrosive applications:

PVDF lining may be installed
FRP lamination may be applied
Protective coatings may be added

Chemical resistance
Corrosion protection
Service life

Stage 8

Nozzle & Accessory Installation

Required fittings are installed, including:

Inlet nozzles
Outlet nozzles
Overflow connections
Drain nozzles
Vent pipes
Level indicators
Sampling ports

The fittings are welded and sealed carefully.

How to Select the Right Rectangular Process Tank

1. Identify the Process Application

The first step is to determine the intended use of the tank, such as:

Chemical storage
Process mixing
Pickling operations
Electroplating
Water treatment
Rinsing or washing processes

Understanding the application helps to define the tank design and material requirements.

2. Determine the Chemical Compatibility

The tank material must be compatible with the liquid to being stored or processed.

Common tank materials include:

Polypropylene (PP)
HDPE
FRP
PVDF
Stainless Steel
Corrosion
Leakage
Material degradation
Product contamination

3. Calculate Required Tank Capacity

Tank size should be selected based on:

Process volume
Batch size
Production capacity
Retention time

Ensure adequate capacity for both current and future operational needs.

4. Evaluate Operating Temperature

The operating temperature affects material selection and tank design.

Check:

Process temperature
Chemical temperature
Ambient conditions
PVDF lining
Reinforced PPH construction
Additional structural support

5. Select the Appropriate Tank Material

Material	Suitable Applications
PP	Chemical processing, pickling
HDPE	Water treatment, mild chemicals
FRP	Large industrial tanks
PVDF	High-temperature corrosive chemicals
Stainless Steel	Food, pharmaceutical, and hygienic processes

6. Consider Tank Dimensions

Rectangular tanks are ideal where:

Floor space is limited
Large process areas are required
Equipment layout demands a rectangular shape
Length
Width
Height
Available installation space

7. Check Structural Reinforcement Requirements

Rectangular tanks experience higher wall stress than cylindrical tanks.

Additional reinforcement may include:

External ribs
Steel frames
FRP strengthening
Support beams

Proper reinforcement ensures structural stability.

8. Maintenance

Easy cleaning
Inspection access
Drainage
Component replacement

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 has a strong technical team and maintains close communication and cooperation with international advanced counterparts, so that our products and technologies have always been at the forefront of the world. At the same time, the company is equipped with a complete after-sales team. Whether it is a product choice of materials or the deep processing of parts, we are equipped with professional one-to-one service. Choosing our Rectangular Process Tanks will truly make you worry-free!

Frequently Asked Questions

1. What is a Rectangular Process Tank?

A rectangular process tank is an industrial tank designed for storing, processing, mixing, rinsing, or treating liquids and chemicals. Its rectangular shape makes it ideal for applications where space utilization and process accessibility are important.

2. What materials are used to manufacture rectangular process tanks?

Common materials include:

Polypropylene (PP)
HDPE
FRP (Fiber Reinforced Plastic)
PVDF-lined materials
Stainless Steel

The material selection depends on the chemical, temperature, and process requirements.

3. What industries use rectangular process tanks?

Rectangular process tanks are widely used in:

Chemical processing
Water treatment
Electroplating
Pickling plants
Pharmaceutical manufacturing
Surface treatment industries

4. Why choose a rectangular tank instead of a cylindrical tank?

Rectangular tanks offer:

Better space utilization
Easy installation in confined areas
Convenient access for processing operations
Efficient arrangement in production lines

5. What chemicals can be stored in a rectangular process tank?

Depending on the tank material, they can store:

Acids
Alkalis
Water treatment chemicals
Process solutions
Electroplating chemicals
Cleaning solutions

6. How is the tank material selected?

Material selection depends on:

Chemical compatibility
Operating temperature
Concentration of chemicals
Process requirements
Mechanical loading conditions

7. What tank capacities are available?

Rectangular process tanks can be manufactured in customized capacities ranging from small laboratory tanks to large industrial process tanks holding several thousand liters.

8. Can rectangular process tanks be customized?

Yes, tanks can be customized for:

Dimensions
Capacity
Nozzle arrangements
Reinforcement design
Agitator mounting
Heating systems

9. Are rectangular process tanks suitable for corrosive chemicals?

Yes, when manufactured from compatible materials such as PP, FRP, HDPE, or PVDF, they can safely handle highly corrosive chemicals.

10. Why do rectangular tanks require reinforcement?

Unlike cylindrical tanks, flat walls experience greater outward pressure. Reinforcements help:

Prevent bulging
Improve structural strength
Increase tank life
Ensure operational safety