Sea water desalination pump

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

Minimum Order: 1 sets

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