Advantages and disadvantages of polyethylene storage tanks and polypropylene storage tanks
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For equipment selection nowadays, storage tanks made of polyethylene or polypropylene can be used, primarily for storing hydrochloric acid and ammonia. Polyethylene storage tanks are manufactured through rotational molding in a single step, while polypropylene storage tanks are welded together; their prices are similar, with polypropylene storage tanks appearing to be slightly cheaper. Let’s discuss which type of storage tank is more stable, safer, and more durable to use This post was last edited by cuicr on 2009-3-19 17:35]
Of course, polyethylene storage tanks can be manufactured through rotational molding in a single step. Both hydrochloric acid and ammonia are corrosive substances, and that’s the main reason! But to be honest, this is the first time I’ve heard of anyone using polyethylene or polypropylene storage tanks for storing hydrochloric acid and ammonia – what an excellent idea! The most important thing is to remember to replace the slide valve at the bottom; otherwise, the liquid will spill everywhere...
It’s better to use rotational molding for one-time formation of polyethylene storage tanks!
1. Process comparison: Polyethylene storage tanks are integrally formed with no welds； Polypropylene storage tanks are constructed by welding plate sections together. 2. Corrosion resistance: They are similar. 3. Safety: Polyethylene storage tanks are weld-free, ensuring safety and reliability ； Polypropylene storage tanks have welds that are prone to leakage. 4. Service life: The service life of polyethylene storage tanks is over 10 years ； The service life of polypropylene storage tanks is about 5 years. 5. Price: Polyethylene storage tanks offer excellent value for money ； Polypropylene storage tanks are relatively expensive.
You might have misunderstood me; I was referring to storage tanks made of polyethylene and polypropylene plastics
Thank you. Now I understand that polyethylene is actually more expensive. Have you used plastic storage tanks from TX? I need a tank with a capacity of 20 cubic meters. Where were yours manufactured, and how is their performance?
Our factory specializes in producing polypropylene equipment, used for handling conventional materials such as ammonia and hydrochloric acid; polypropylene storage tanks are widely used in this context. Recently, we built a 25-cubic-meter vertical storage tank for a client, used for storing sodium hypochlorite. Compared to polyethylene, polypropylene has better corrosion resistance, but this doesn’t matter when storing hydrochloric acid or ammonia, as neither PP nor PE has any problems with that. PP also has better heat resistance; it can handle temperatures up to 100 degrees without issue. However, it becomes brittle at temperatures below -10 degrees (this situation rarely occurs). If the material stored inside is at a temperature higher than room temperature, it is recommended to use PP containers. In terms of strength, PP also has an edge, but its toughness is inferior to that of PE. As for the issue of weld leakage mentioned on the 4th floor, it is undeniable that leaks can occur wherever welding takes place; however, welding is still widely used in chemical plants for equipment construction. In terms of service life, one-piece molded PE tanks are better. However, a volume of 20 cubic meters is not large, and the advantages of one-piece forming equipment in terms of material usage and strength are not significant compared to welded equipment; therefore, it does not have a price advantage either. For one-piece molded PE tanks, molds are required, and their dimensions are fixed; the dimensions of welded PP tanks can be customized according to customer requirements. For reference only.