The stainless steel (including duplex steel) vertical long shaft suspended semi submersible sump sewage pump is a special single-stage single suction long shaft centrifugal pump specially designed for working conditions with strong corrosion and a small amount of solid particles. Its core advantage is no mechanical seal, zero leakage, and excellent corrosion resistance, fully complying with ISO2858 and ISO5199 international standards. The vertical long shaft suspended semi submersible sump sewage pump is the main equipment for transporting corrosive media in industries such as chemical, metallurgical, and environmental protection.
🔧  Core structural characteristics
Fully corrosion-resistant overcurrent material: The overcurrent components are made of 304/316L stainless steel and duplex steel 2205/2507 material. The key friction surfaces can be strengthened by alloy powder welding, and the resistance to chloride ion corrosion and abrasive wear far exceeds that of ordinary carbon steel pump types.
Layout of Upside Dry Motor: Non corrosion-resistant components such as motors and bearings are all arranged on the ground, and torque is transmitted through multiple high-precision long shafts. Motor maintenance does not require downhole operations, completely avoiding corrosive gases from corroding electrical components.
No mechanical seal design: traditional exposed mechanical seals are eliminated to fundamentally eliminate the risk of leakage of highly corrosive media. It is suitable for transportation scenarios involving flammable, explosive, and highly corrosive media, greatly improving operational safety.
Double bearing lubrication system: The upper rolling bearings are lubricated with grease, and the lower liquid guide bearings can be made of self-lubricating materials such as Sailong and filled with polytetrafluoroethylene. The cleaning medium can achieve self-lubricating, and for particle containing conditions, it can be cooled and lubricated with water at a pressure of 0.2 MPa or above.
Double blade wheel adaptation scheme: Centrifugal double balanced impellers are used for cleaning corrosive media, and open double balanced impellers are used for media containing solid particles and short fibers, adapting to different working conditions.
Customizable shaft system: The underwater depth can be flexibly adjusted by increasing or decreasing the number of lifting pipe joints. The conventional version supports 1-6 meters, while the ultra long customized version can be extended to more than 20 meters, suitable for various deep water tank and underground storage tank working conditions.
📊  Typical performance parameters
parameter item
Industry wide scope
Rated flow rate 1.6~2600 m ³/h
Total head 5-132 meters
The standard medium temperature is -20~150 ℃, and the special jacket design can cover up to 180 ℃
Design work pressure 1.6 Mpa
Under normal operating conditions, the operating efficiency can reach 80%~89%, and the high-efficiency zone covers 70%~120% of the rated flow rate
Corrosion resistance equivalent (PREN) duplex steel material ≥ 35, capable of long-term stable operation in high chloride ion environments
🏭  Main application scenarios
Chemical and pharmaceutical industries: transporting various highly corrosive liquids such as acids, alkalis, salts, as well as chemical slurries containing small amounts of solid particles, widely used in fine chemical, pharmaceutical, electroplating and other process links.
Metallurgy and Environmental Protection Industry: Transporting metallurgical waste liquids and acidic wastewater containing heavy metals. Dual phase steel materials can resist the dual erosion of high chloride ions and high abrasive particles, greatly extending equipment life.
Ocean Engineering and Seawater Utilization: Made of 2205/2507 duplex steel material, seawater is directly extracted from the ocean as circulating cooling water or raw water for desalination plants, with a much higher resistance to seawater corrosion than ordinary 316 stainless steel.
Wastewater treatment industry: transporting industrial wastewater, sludge, and wastewater containing corrosive components, suitable for high corrosion wastewater upgrading scenarios in municipal wastewater treatment plants and industrial park wastewater treatment stations.
New energy and special working conditions: Suitable for the transportation of corrosive electrolytes in the photovoltaic and lithium battery industries, as well as the transportation of highly corrosive waste liquids in the hazardous waste treatment industry, fully meeting the zero leakage requirements of high-risk environmental protection working conditions.
✨  Core operational advantages
Corrosion resistance performance: The corrosion resistance equivalent (PREN) of duplex steel material is ≥ 35, which can operate stably for a long time in high chloride ion and strong acid-base environments. Its service life is 2-3 times that of ordinary stainless steel pumps.
Zero leakage safe operation: with no exposed mechanical seal design, it eliminates the safety hazards of strong corrosive media spraying from the root, fully meeting the safety requirements of high-risk scenarios such as chemical and hazardous waste.
Extremely reliable start-up: The impeller is always completely submerged below the liquid level, achieving self filling water supply throughout the entire process. Water can be discharged immediately upon start-up, completely eliminating the risk of start-up failure caused by suction and cavitation in ordinary centrifugal pumps.
Low land occupation and infrastructure costs: The vertical structure is directly installed on the top of the water tank and tank body, requiring only a small amount of foundation installation and no additional large space pump room. The infrastructure investment is reduced by more than 40% compared to horizontal corrosion-resistant pumps with the same parameters.
Convenient and safe maintenance: The motor is located on the ground, and daily inspections and maintenance do not require going underground. The core pulling rotor design does not require dismantling external pipelines, and internal components can be directly removed to complete maintenance, greatly reducing downtime.
Key operating taboos: It is strictly prohibited to operate vertical long shaft suspended semi submersible sump sewage pump dry. A low water level automatic pump stop protection device must be installed to prevent the bearing of the vertical long shaft suspended semi submersible sump sewage pump from dry grinding and burning due to low water level; The outlet pipeline should be supported by additional brackets, and its weight should not be entirely pressed on the pump body flange.