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Railway flexitank

Railway flexitanks are container liquid bags designed for rail transport. Due to the unique nature of railway transportation, CSS flexitanks have passed the China Railway Certification Center (CRCC) tests, verifying that their physical properties (e.g., pressure resistance, impact resistance, and sealing) and chemical compatibility meet railway transport standards. While railway flexitanks are similar in form to standard container flexitanks, they differ significantly in their baffle and frame design.

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Description

Flexitank Specifications

(Customizable based on the density of the cargo)

Railway flexitank
Railway flexitanks are container liquid bags designed for rail transport. Due to the unique nature of railway transportation, CSS flexitanks have passed the China Railway Certification Center (CRCC) tests, verifying that their physical properties (e.g., pressure resistance, impact resistance, and sealing) and chemical compatibility meet railway transport standards. While railway flexitanks are similar in form to standard container flexitanks, they differ significantly in their baffle and frame design.
  • Capacity: 16,000–26,000 liters
  • Configuration:
    • 2 layers of PE inner film + 1 layer of PP outer film
    • 3 layers of PE inner film + 1 layer of PP outer film
    • 4 layers of PE inner film + 1 layer of PP outer film
  • Operating Temperature Range: -20°C to +80°C
  • Carrier: Standard 20-foot container
  • Transportation Modes: Inland, maritime, railway, and multimodal freight transport
  • Auxiliary Accessories: Food-grade valves, valve shut-off plates, double-layer corrugated paper, partitions, square steel bars, steel frame (optional)

Product Parameters

  • Inner PE Layer: Number and thickness of PE layers customizable per client and product requirements
  • PE Thickness per Layer: 0.13 mm
  • Total Weight: Approximately 50 kg
  • Tensile Strength:
    • Longitudinal: ≥30 MPa
    • Transverse: ≥32 MPa
  • Tear Strength:
    • Longitudinal: ≥120 N/mm
    • Transverse: ≥115 N/mm
  • Puncture Resistance: ≥1400 g
  • Elongation:
    • Longitudinal: ≥740%
    • Transverse: ≥750%
  • Oxygen Permeability: <1 cc/100 m²/24 hours
  • Moisture Permeability: 0.3 g/m²/24 hours
  • High-Temperature Resistance: 10°C to 80°C

Comparison with Similar Products

Aspect Barrels IBC Tankers/Standard Containers Flexitank
Procurement Cost High High Expensive rental fees Low
Loading Time Long Long Limited versatility Fewer workers needed
Unloading Time Long Long High cleaning costs Short
Space Utilization Low Requires forklifts Long deployment cycle High
Post-Use Handling Difficult Complex transfer Complex transfer Disposable, no cross-contamination

Flexitank Structural Features

  • Multilayer Design:
    • Inner Layer: Food-grade polyethylene, in direct contact with the liquid cargo, offers excellent chemical stability to prevent reactions with other materials, ensuring cargo quality. For example, when transporting wine, this layer prevents the wine’s acidic components from corroding other parts of the flexitank.
    • Outer Layer: High-strength materials like nylon reinforce the flexitank’s overall durability, enabling it to withstand the weight of the liquid and pressures or impacts during transport. For instance, when filled with tons of liquid, the middle layers prevent rupture.
    • Wear- and UV-Resistant Materials: Protect the flexitank from external damage during loading, unloading, and transport. Especially during open storage or sea transport, the outer layer resists UV degradation from sunlight.

Advantages

Cost-Effectiveness

Compared to traditional liquid transport containers like steel or plastic barrels, flexitanks have lower costs due to affordable materials and efficient use of container space, reducing the number of packaging units needed. For example, transporting large volumes of edible oil in barrels is costly and space-intensive, while a flexitank can carry more oil in a single container, lowering per-unit transport costs.

High Flexibility

Flexitanks can be customized based on the properties of the liquid cargo and transport requirements. For liquids with specific temperature needs, insulation can be added to the outer layer; for oxidation-sensitive liquids, an oxygen barrier can be included. Flexitank sizes can also be adjusted for 20- or 40-foot containers.

Raw Material Analysis

  • Inner Film: High-density, high-performance PE film with a unique formula ensuring excellent mechanical properties, flexibility, and heat-seal strength. Advanced domestic PE film production equipment and feeding systems enable fully automated, uninterrupted, and unmanned continuous production, with physical properties (tensile strength, elongation at break, dart impact strength, thickness uniformity, and flexibility) exceeding industry standards.
  • PP Outer Layer: Polypropylene outer bag with tensile strength exceeding international standards by 15.2%.

Ball & Butterfly Valves

Product Overview

CSS flexitank ball valves are designed specifically for flexitanks, featuring flange screw connections for easy and simple installation. The valve body is made of non-toxic, corrosion-resistant material.

Valve Features

  • Triple sealing structure (valve plate, threaded cap, dust cover) prevents leaks comprehensively.
  • Non-toxic, corrosion-resistant, high-temperature-resistant sealing ring.
  • Self-locking handle ensures safe, reliable, and convenient operation.