Desalination is a critical technology addressing global water scarcity. Behind this process, the choice of materials—particularly for storage tanks and piping systems—directly determines plant reliability, safety, and economic viability. For sodium hypochlorite storage tanks, acid cleaning tanks, and various piping systems used in desalination, FRP (Fiber-Reinforced Plastic) has become the industry standard due to its unique performance advantages.

The core challenge in desalination is combating high salt concentrations and aggressive chemical environments. Seawater contains approximately 19,000 mg/L of chloride ions (Cl⁻), and the brine concentrate from RO (Reverse Osmosis) processes can reach 35,000–50,000 mg/L—two to three times that of seawater. Under such conditions, even stainless steels (e.g., 316L or duplex) are vulnerable to pitting, crevice corrosion, and stress corrosion cracking, as chlorides penetrate the passive oxide layer.

FRP offers an ideal solution. Its polymer cross-linked network is chemically inert to chlorides, eliminating reliance on passive films. While initial costs may be comparable to metallic piping, FRP requires no coating repairs, cathodic protection, or frequent replacement, reducing total life-cycle costs by 40–60% over 20 years.

In desalination pretreatment, sodium hypochlorite (NaOCl) is typically dosed as a biocide to control marine growth on membranes and pipelines. However, NaOCl is a strong oxidizer and corrosive medium, imposing stringent requirements on storage vessels.

RO membranes lose performance due to inorganic scaling (e.g., calcium carbonate, calcium sulfate) and require periodic acid cleaning to restore flux. Acid cleaning tanks store and prepare cleaning acids (e.g., citric acid, hydrochloric acid).

From seawater intake, pretreatment, high-pressure RO, to brine discharge, piping networks are the "vascular system" of a desalination plant. FRP pipes play an irreplaceable role.

In the corrosive environment of desalination, FRP offers the optimal solution for sodium hypochlorite tanks, acid cleaning tanks, and critical piping systems. Choosing FRP is not just a material selection—it is a commitment to life-cycle cost efficiency and long-term operational stability.