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Understanding Tank Technology Key to Designing Large Tanks, says Tasman Tanks

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The Tasman Tank Co.  says that customers need to be aware of tank technology in order to optimise choices for their industry and the environment while designing large tanks.   

Tasman Tanks, producing more than 200 large industrial and municipal tanks a year says that advances in specifying, design, protective coatings, manufacture and installation need to be understood by the buyer to get the best for particular industries and applications, especially in the resources, energy and green environmental processing segments.  

Exacting demands are placed on the design and manufacture of large capacity industrial tanks since they are not only expected to hold upwards of 10, 20 or even 30,000 tons of liquid, they are also being asked to hold more water and specialised liquids more safely and securely than ever before for longer periods in more challenging operating environments.  

Bolted steel tanks offer major advantages of cost-efficient size potential as well as the ability to isolate diverse liquids through advanced coatings that will not react with contents over time.  

Factors such as size, optimum durability and maximum protection for contents are pertinent to industries such as mining and resources, food and beverage as well as primary processing and manufacturing.  

The tanks used by these industries have to be big to cope with large-scale industry often in remote locations. Installation time is also important, an area where bolted steel tanks score high with off-site prefabrication and modularisation, reduced on-site time and fewer potential interruptions during construction.    

Bolted steel tanks are available in varying standards of design, production, materials and quality. It is important for buyers to seek clarification on specific features and characteristics before investing in one.  

Does it conform to Australian and New Zealand Standards?  

Geographic location and environmental conditions expose developments of the resources, energy and large processing industries to risks posed by under-engineered structures. Bolted steel tanks must meet Australian/New Zealand Standards 1170.2:2002 relating to structural design actions including wind actions such as cyclonic loads.  

Fit-for-purpose cost-efficiency  

The basic needs of many applications can be cost-efficiently met by versatile bolted steel designs incorporating an internal membrane liner. Tasman’s tanks for instance, feature wall sheet materials such as Galvabond, hot dip galvanised steel and stainless steel.  

Internal membrane liners include PVC, aeon, butyl rubber, polypropylene or Strongline. Roofs, where required are designed to AS/NZS1170.2 in materials such as monoclad steel, long-life zinc aluminium and aluminium.  

It can be very advantageous for the buyer if the manufacturer also offers the option of a complete turnkey site construction service.  

Tasman Tanks uses a synchronised jacking process that enables installation of tanks or silos at grade level. Rated highly for quality and safety for the on-site construction phase, the process reduces OH&S risks associated with working at heights.  

Zero discharge vacuum and pressure applications    

Zero discharge applications such as methane capture, biogas capture, anaerobic and aerobic process, ultrafiltration, steam and demineralised water used for turbine cooling require totally sealed tanks with the contents isolated from outside contaminants.  

Contamination must also be prevented from elements in the tank’s structure that might react with the contents over time.  

Some of these tanks include bulk storage tanks, intake tanks, flocculation tanks, filtration tanks, mixing tanks, balance tanks, disinfection tanks, chemical tanks and settling tanks.  

Fusion-bonded coating systems play a major role in zero discharge applications and include products developed by Tank Connection group and Akzo Nobel. These factory-applied coatings are particularly suited to totally sealed applications where all the liquids involved in a process are retained on-site.  

These coatings are equally relevant to alternative waste treatment facilities (AWTs). These waste treatment systems utilise the latest in factory coated fusion bond systems for the bolted tank construction of digesters and liquid storage tanks.  

Fusion coatings  

The new generation proprietary LIQ Fusion 7000 FBE coating from Tank Connection is approved for potable drinking water with NSF-61 international standard approval.  

Designed as an advance on glass/porcelain enamel coatings, LIQ Fusion utilises the protective properties of an exclusive FBE epoxy powder fused to substrate with a fused external topcoat of SD polyester.  

LIQ Fusion FBE advantages include: 

  • Does not spall or crack
  • Holiday-free coating, fusion bonded to substrate surfaces to give total coverage without blemishes, pinholes or other protective flaws
  • Electrostatic applied ‘powder-on-powder’ system provides complete wraparound on panel edges and in bolt-holes
  • Can be repaired with a documented touch-up procedure
  • Does not require costly and potentially troublesome cathodic protection
  • Outperforms conventional coatings
  • Standard warranties on potable water storage

Selecting the right people to build the tank  

It is important to check the credentials of the supplier as well as their track record in building tanks for the buyer’s industry.   

The short-listed companies must share the project’s common objectives to ensure time and budget outcomes. This commitment to shared objectives can produce major benefits in cost and time savings while achieving ongoing operational efficiencies.  

Independent engineering assessments  

Quality tank suppliers will not object to having their designs verified by an independent engineer.  

Each of Tasman’s tanks is certified to all relevant codes with independent engineers providing verification of specifications and performance.  

Additionally, the company’s project management policies and structures including quality management, environmental and OH&S systems are regularly reviewed by an external auditor to ensure adherence with government and industry regulations.

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