Classification by Manufacturing Process
1. Spiral Wound FRP Storage Tanks
- Features: Made by mechanically winding fiber reinforcement materials (such as glass fiber) and resin. Smooth inner wall, high strength, suitable for large storage tanks (volume up to 1000m³ or more).
- Advantages: High degree of automation, good product consistency; strong pressure resistance (working pressure typically 0.6-1.0MPa).
- Applications: Storage of corrosive liquids in chemical, wastewater treatment, and other applications.
2. Hand Lay-up FRP Storage Tanks
- Features: Fiber cloth is laid layer by layer manually and then coated with resin. High flexibility, can be customized for complex shapes.
- Disadvantages: Low production efficiency, prone to air bubbles or uneven thickness. Suitable for small batches or irregularly shaped tanks (such as conical bottom tanks).
3. Molded FRP Storage Tanks
- Features: High-pressure molding using molds. High surface precision, but size limitations (generally single-piece volume < 50m³).
- Typical Applications: Small aseptic storage tanks for the food and pharmaceutical industries.
Classification by Structural Form:
1. Vertical Storage Tanks
- Saves floor space; height up to 15 meters (reference standard: HG/T20696-2018); requires ladders and guardrails.
2. Horizontal Storage Tanks
- Good stability; suitable for outdoor installation; commonly used in transport tankers or temporary storage; length typically ≤12 meters.
3. Underground Storage Tanks
- Designed to resist soil corrosion; requires anti-buoyancy devices; suitable for gas stations, fire pools, etc.
Extended Classification: By Function and Reinforcing Materials
1. Acid and Alkali Resistant Storage Tanks: Made of vinyl ester resin, pH range 1-14 (tested according to ASTM D543 standard).
2. Food-Grade Storage Tanks: Lined with non-toxic resin, meets FDA certification requirements.
3. Sand-Filled Storage Tanks: Adds a quartz sand layer to increase rigidity; lower cost, but increases weight by approximately 30%.