One of the preferred tank selections at present are polyethylene (poly) water tanks. One other alternative you will doubtless come throughout when deciding upon a rainwater tank are stainless steel tanks.
Earlier than evaluating vital differences between poly and stainless steel water tanks, it’s important to understand that there are completely different grades of stainless steel. Grades are often represented by different numbers. For instance, 304 Stainless Steel is commonly what you find in your kitchen sink. If the stainless steel in being used in marine environments than a higher grade of 316 Stainless Steel would be used.
Chromium is a base aspect present in stainless steel that prevents corrosion. To resist the corrosive effects of salty sea water, harsh acids and the like, the chemical factor molybdenum needs to even be added. Molybdenum is found within the 316 Stainless Steel and is utilized in surgical devices and stainless steel implants.
Unless specially requested, at higher expense, 304 Stainless Steel (or less), will seemingly be used in a stainless steel rainwater tank. Always affirm first with the provider what grade of stainless steel they use before buying. If you aren’t familiar if stainless steel grades, then simply research the grade of steel online by typing it right into a search engine.
Below we compare key necessary variations between poly water tanks and stainless steel tanks, together with how long it should final, strength, maintenance, set up and value.
Ease of Set up
Firm foundations are perfect for all tanks, nonetheless bases can typically consist of crusher mud for poly tanks. Stainless steel tanks require extra compact and stable foundations attributable to their construction.
It can be crucial to make sure your foundations are protected from erosion. As soon as a stainless steel tank is installed nonetheless, you do not need to maneuver it again. Not only is it heavy, but you threat compromising its structural integrity and having leaks develop.
Poly water tanks however are much lighter and easier to set in place. In case you additionally resolve to re-find your tank later on, then a poly water tank is way easier to maneuver.
Poly water tanks can final a very long time, as much as 20 years or extra. The material can withstand the tough results of the Sun on account of UV-stabilisers added to the moulding combine. Just like how including chromium to steel can protect it from rust, so too UV-stablisers being added to a polymer mix prevents the plastic from becoming brittle and decomposing.
With stainless steel tanks it is crucial to keep them clean with a cloth and recent water. Keep solvents away which could trigger corrosion resembling salty sea water or chlorine present in pools.
Do not bury your stainless steel tank at all. High industrial areas and welding may also leave iron deposits that may cause irreversible pitting and even result in your stainless steel tank leaking.
Keep in thoughts corrosion usually occurs at the joints, rivets or screws. Incorrect welding can neutralise the protecting factor within the stainless steel allowing rust and corrosion to happen.
There are experiences of stainless steel tanks leaking within two years as a result of poor manufacturing, so it is very important do your homework.
Stainless steel tank warranties differ, however a top quality stainless steel tank ought to carry a excessive warranty when it comes to its steel. Keep in thoughts the weak level with the stainless steel tank is often with how they are manufactured or sheets joined together.
While warranties for the stainless steel in tank may be discovered for 30 years and extra, the precise manufacturing of the tank is often half that. While your stainless steel tank can last greater than 15 years, we have seen stories of some stainless steel tanks leaking inside 2 years on account of corrosion of rivets or screws joining the corrugated sheets collectively.
As for poly water tanks, they will carry a warranty of up to 25 years. Based mostly upon warranties alone, rather than the precise product, warranties for a quality polymer water tank most likely present higher peace of thoughts than that of a stainless steel tank.
Poly tanks require a lot less ongoing expense to maintain, and can be setup with a tank self-cleansing system. A special easy-to-set up pipe with particular holes is positioned contained in the tank and connected to the water tank overflow. At any time when your tank is stuffed with water all of the debris at the underside of the tank gets sucked into the pipe and expelled out of your tank.
To maintain your rainwater contemporary in a stainless steel tank usually requires a dearer two-tank system. Rainwater falls into the primary tank which contain a coarse filter screen inside. The water falls by the display, and the debris will get trapped and discharged out the facet of the tank. This filtered water is then pumped through a finer filter before being pumped right into a second stainless steel water tank. This ensures your water at all times remains clear and recent tasting.
Water High quality
Poly and stainless steel water tanks present equally high quality water.
Understand that in stainless steel rivets and screws can corrode and pollute your drinking water. An investigation by the public and Environment Health Companies in Tasmania even found water in some stainless steel tanks containing harmful levels of lead.
Poly water tanks manufactured from food-grade polyethylene provides the purest high quality water and often at a lot cooler temperatures.
Stainless steel tanks are very strong and will not bulge or warp since they are made from steel. Being steel nevertheless, they are much less impact resistant than a poly tank which is able to easily withstand being struck with a hammer.
A weak level with stainless steel tanks are once more in how it has been manufactured. That is, how the stainless steel sheets have been joined together and connected to the base.
Poly tanks are also very robust. If correctly designed and manufactured in accordance with Australian requirements for poly tanks then bulging and warping should by no means occur. Some features of a strong and quality poly tank include:
Further requirements for building a robust poly tank are discovered within the Australian poly tank standard, AS/NZS 4766 Polyethylene storage tanks for water and chemicals.
Notice: Not all Australians poly water tanks comply with this customary. At all times affirm your tank is certified by asking the manufacturer who certified them and for their certification quantity.
Stainless steel tanks may be manufactured to higher capacities than poly tanks, and infrequently used for different purposes. Whereas poly tanks will be made to reliably store water as much as around 50,000 litres, stainless steel tanks may be constructed to store up to round 250,000 litres. That stated, poly tanks could be coupled collectively to provide a mixed capacity.
Stainless steel tanks come in different finishes, however don’t offer a collection of colours to select from. Many poly water tanks, provide a range of COLORBOND® colours.
Steel tanks can usually be specifically constructed if need be, as can poly water tanks. Every have comparable shapes, your conventional spherical and slimline.
Poly tanks offer larger versatility nonetheless, supply tank options that may be positioned under a deck and or underground. You is not going to find stainless steel tank options in these categories.
Poly tanks are much cheaper to buy than a stainless steel tank. Roughly 50% cheaper, but this depends upon measurement, kind and brand of tank bought.
Workforce Poly Water Tanks
Crew Poly are experts in manufacturing poly products. Our vary includesrainwater tanks,industrial tanksandfarming products. In case you have found this article useful, why notcontact us todayto focus on your needs.