Polypropylene (PP) tank fabrication involves the design and construction of tanks using polypropylene sheets or panels. These tanks are widely used for chemical storage, wastewater treatment, electroplating, and industrial processes because of their excellent chemical resistance, light weight, and durability.

Basic Steps in Polypropylene Tank Fabrication:

1. Design & Engineering

• Determine required capacity, dimensions, temperature resistance, and chemical compatibility.

• Design considerations include:

• Type: Cylindrical, rectangular, conical bottom, etc.

• Reinforcements: External steel frames or internal ribs if needed.

• Accessories: Manholes, nozzles, inlets/outlets, level indicators, agitators.

2. Material Selection

• Homopolymer PP (PP-H): Better rigidity, higher temperature resistance.

• Copolymer PP (PP-C or PP-B): Better impact resistance, more flexible.

• Sheet thickness: Typically 6mm–50mm depending on size and pressure.

3. Cutting & Shaping

• Sheets are cut to size using CNC routers or saws.

• Heat bending is used to form cylindrical or curved shapes.

4. Welding

• Extrusion welding, hot air welding, or butt fusion welding methods are used.

• Welds must be chemically resistant, air-tight, and structurally sound.

• Welding rods must match the PP material grade.

5. Assembly

• Side walls, bottom plates, and top covers (if needed) are joined together.

• Supports or external frames may be added for large or tall tanks.

6. Testing & QA

• Leak testing: Hydrostatic or air pressure tests.

• Visual inspection: Weld integrity, alignment.

• Non-destructive testing (NDT) may be applied for critical applications.

Optional Add-ons:

• Flanged connections (HDPE/PP/metal).

• Overflow outlets.

• Ladders and platforms.

• Level sensors or viewing strips.

• Agitator mounts or internal piping.

Common Uses:

• Chemical mixing tanks.

• Pickling and plating baths.

• Acid or alkali storage.

• DI water tanks.

• Custom tanks for semiconductor or pharma industries.