Sea Water Desalination Pump - China

Sea water desalination pump

The core flow components (impeller, pump casing, shaft, etc.

) of seawater desalination pumps are preferably made of duplex stainless steel or super duplex stainless steel to resist corrosion and stress cracking in high chloride environments.

Core Recommended Material

• Super Duplex Stainless Steel (e.g., 2507/S32750): Currently the mainstream choice for high-pressure pumps in large-scale reverse osmosis seawater desalination systems.

With high pitting resistance equivalent number (PREN), it effectively resists corrosion from chloride ions and stress corrosion cracking in seawater, offering superior mechanical strength compared to ordinary stainless steel, making it suitable for high-pressure applications.

• Duplex stainless steel (e.g., 2205/S31803): Suitable for booster pumps and transfer pumps in medium-low pressure or pretreatment stages.

It offers better cost performance than super duplex steel and significantly outperforms 316L in corrosion resistance, making it a commonly used balanced solution in engineering applications.

• Super austenitic stainless steel (e.g., 904L, 6% Mo steel): Used as an alternative in specific highly corrosive or high-temperature applications, offering excellent corrosion resistance but at a high cost, typically employed for critical seals or special components

316/316L stainless steel: Although containing molybdenum element, it has insufficient resistance to pitting and crevice corrosion in long-term seawater environment, and is prone to local corrosion.

It is only recommended for short-term, low flow rate or non critical auxiliary pipelines and is not recommended as the main material for core overcurrent components.

bronze alloy (such as nickel aluminum bronze): a traditional marine material, but it is susceptible to cavitation corrosion and electrochemical corrosion under continuous operation conditions of seawater desalination, and environmental restrictions have increased.

Modern large-scale desalination plants have gradually been phased out.

Ordinary carbon steel/cast iron: no anti-corrosion ability, strictly prohibited from direct contact with seawater medium

Distinguishing working conditions: The high-pressure pump (RO system core) must use high-grade materials such as 2507; The water intake pump/discharge pump can use 2205.

Process control: Duplex stainless steel has extremely high requirements for welding and heat treatment processes, and it is necessary to ensure the balance of ferrite/austenite ratio, otherwise brittle phases may precipitate and cause failure.

Non metallic materials: Some seals, bearings, or liners may use special engineering plastics such as carbon fiber reinforced PEEK to assist in corrosion resistance and friction reduction.

It is recommended to prioritize API 610 standards material confirmation based on specific pressure levels, seawater temperatures, and project budgets.

Company Contact:

• Posted By: Kenshine Pump And Valve MFG Co.,LTD

• Phone: 862133592713

• Address: Yindu Road 1535,Minhang District, Shanghai, Shanghai , Shanghai , China

• Email:

• Website: http://www.kenshine-pump.com

• Business Description: Manufacturer and sales for various pumps such as centrifugal
  
  pump, industrial pump, chemical pump, submersible pump, self priming
  
  pump, diaphragm pump, electromagnetic pump, gear pump, multistage pump etc
  
  KENSHINE PUMP&VALVE MANUFACTURING CO., LTD is the integrated enterprise specializing in research and development and design and produce and sales of pump and valves.
  
  KENSHINE PUMP&VALVE MANUFACTURING CO., LTD locates in MINHANG industrial zone, SHANGHAI which is the economic trade center in China and established in 1985 - KENSHINE PUMP&VALVE MANUFACTURING CO., LTD have developed and enlarged many years, supported by scientific management, sophisticated technology, advanced equipment and strict quality system.
  
  Company is continuously going up as the 40% rising speed every year and is as the one of industrial manufacturer in China.
  
  Company had ISO certificate in 1998 and the products are according to JB/JQ20103 1998 and JB/JQ20104 1998 standard.
  
  The quality of products is insured by PICC.
  
  Company has several sales and service networks in many middle and big cities of China.
  
  The products are sold to domestic cities and exported oversea about 40% products.