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flexitank overview

Flexitank Overview

Delivering commitment and solutions

The flexitank was first designed to be a more efficient solution to offset the drawback of other existing options. A simple comparison highlights the benefits of the flexitank.

Ocean Tanker

  • Lowest cost
  • Cheap sea leg but expensive door to door delivery from bulk
  • Survey costs
  • Not available in smaller ports without bulk facilities
  • Require bulk facilities each end of leg
  • Many pump transfers
  • Storage costs and inconvenience if arrival late or early
  • Numerous transfers increase risk of contamination to product

Flexitank

  • 2nd lowest cost
  • Low weight of flexitank causes higher payloads and lower freight costs
  • Require return load to be economic which is not always easy or possible
  • Not always available in remote areas
  • Slow to position
  • Costly to clean
  • Require a lot of space for stockpiling
  • Inefficient cleaning can lead to contamination

ISO Tanker

  • 3rd lowest cost
  • Expensive equipment - high rental costs compared with flexitank
  • Survey costs
  • Not available in smaller ports without bulk facilities
  • Require bulk facilities each end of leg
  • Many pump transfers
  • Storage costs and inconvenience if arrival late or early
  • Numerous transfers increase risk of contamination to product

IBCs / Drums

  • 4th lowest cost
  • Higher cost of packing compared with flexitank
  • Lower payload in container, higher freight cost than flexitank
  • Available in remote areas
  • Require specialized equipment for effective cleaning
  • Require forklift for loading and unloading container
  • Takes up lots of storage space when empty or full. High storage costs.
  • Disposal can create environmental problems

Design
Thin MULTI-LAYER Design

Thick SINGLE-LAYER Design
Design Aspects
  • 3-5 thin wall (5 mil) PE liners
  • Woven PP jacket
  • Heat-sealed to light-weight plastic fittings
  • Single thick-wall (40 mil) liner
  • No woven outer PP jacket
  • Heat-sealed to light-weight plastic fittings
Design Drawbacks
  • Plastic heat-sealed fitting causes most of the problems
  • Thin liners can be sucked up into the pump during discharge
  • Uses wooden bulkhead
  • Heat welded fittings causes most of the problems
  • Thick single wall is stiff and difficult to discharge
  • Uses wooden bulkhead
Handling Drawbacks
  • Top load and discharge is unsafe and labour intensive
  • Cannot be tested before shipment
  • Top load and discharge is unsafe and labour intensive
  • Cannot be tested before shipment