In coastal cities and high-humidity areas, the durability of the drainage system is directly related to the safety and operation and maintenance costs of urban infrastructure. Typical coastal cities such as Hong Kong and Singapore face erosion from high-salt air and humid climate all year round. Traditional cast iron drainage pipes are prone to leakage and damage due to corrosion, and even cause environmental pollution and hidden dangers in building structures. In response to this pain point, DINSEN has launched a revolutionary product – zinc-sprayed cast iron drainage pipes, which redefines industry solutions with innovative processes and high-standard performance.
The coastal environment is much more corrosive to metal pipes than inland areas. The chloride ions in the salt spray combine with the moisture in the air to accelerate metal oxidation, causing the zinc layer on the surface of traditional galvanized pipes to fall off quickly, and eventually causing corrosion of the pipe body. In addition, frequent temperature changes and ultraviolet radiation will also aggravate the aging of the coating. Traditional anti-corrosion technologies (such as ordinary galvanizing or painting) are difficult to maintain long-term protection effects in complex climates. Frequent replacement of pipes not only drives up costs, but also affects the normal operation of the city.
The anti-corrosion time of hot-sprayed zinc is about 4-10 times higher than that of untreated steel. The specific difference depends on the environmental level and process standards. Under standard construction conditions, hot-sprayed zinc can provide long-term protection for more than 20 years, while untreated steel may only last for 3-5 years under the same environment. The following figure is a direct comparison of zinc-sprayed and un-zinc-sprayed cast iron pipes. The left side is a zinc-sprayed cast iron pipe (DN50 EN877:2021 A1 Z), and the right side is an ordinary cast iron pipe.
The anti-corrosion performance of this process has passed the rigorous tests of the EN877 standard (including salt spray test, cyclic corrosion test, etc.). EN877 is the authoritative certification standard in the field of cast iron drainage pipes in Europe, which puts forward systematic requirements for the mechanical properties, sealing and anti-corrosion ability of pipes. DINSEN zinc-sprayed cast iron pipes are suitable for high-rise buildings, underground integrated pipe corridors and other scenes where frequent construction is difficult. They fully comply with the EN877 standard and are popular among high-end customers for their anti-corrosion advantages.
Currently, the product has been successfully applied in many landmark buildings in Hong Kong (such as commercial complexes and airport expansion projects), and has been gradually promoted to coastal areas such as Southeast Asia and the Middle East. Its value is not only reflected in its technical performance, but also wins the favor of customers through its full life cycle cost advantage – although the initial investment is slightly higher than that of ordinary pipes, its long-term maintenance-free characteristics can reduce the overall cost by more than 30%.
Under the dual pressures of urbanization and climate change, the “invisible line of defense” of infrastructure urgently needs to be upgraded. With its innovative anti-corrosion technology and high-end standard certification, DINSEN zinc-sprayed cast iron pipes provide coastal cities with reliable and sustainable drainage solutions. In the future, as the global demand for resilient cities increases, this technology may redefine the industry benchmark and promote the transition of cast iron pipes from “functional parts” to “value parts”.
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Post time: May-23-2025
