A Vertical Pump with PPH Wetted Parts

After reviewing AAL's actual operating conditions, Meibao identified three key requirements::

Keep the motor away from acid fumes. Prevent shaft-seal leakage. Maintain stable operation when the tank level changes.
A conventional horizontal pump could not fully address these issues.Meibao therefore recommended the MIT-40VK-55NF vertical pump.Its vertical design places the motor above the liquid level, while the seal-less structure removes the traditional shaft-seal leakage point. PPH wetted parts were selected for the customer's mixed-acid application and 60°C operating temperature.

Why MIT-40VK-55NF?

Selection Requirement	MIT-40VK-55NF Advantage
Acid-fume exposure	Motor is positioned above the liquid level and away from the main fume area
Corrosive liquid	PPH wetted parts are designed for corrosive chemical service
Leakage prevention	Seal-less design removes the mechanical shaft-seal leakage point
Changing liquid levels	Vertical submerged pump design helps maintain stable liquid intake
Circulation flow	Up to 450 L/min for filter-machine circulation

Key Advantages

Vertical Design · Seal-Less Structure · Stable Operation
● Motor away from acid fumes: The vertical design keeps the motor above the liquid level, reducing exposure to corrosive fumes.
● No shaft-seal leakage: The seal-less design removes a common leakage point found in conventional shaft-seal pumps.
● Better handling of changing liquid levels: The submerged pump section stays in the liquid, helping maintain stable suction as the tank level changes.
● PPH wetted parts: The wetted components are made from PPH for corrosion resistance in the customer's mixed-acid application.

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Selected Pump Specifications

Specification	MIT-40VK-55NF	Key Benefit
Wetted Material	PPH	Corrosion-resistant wetted parts
Drive Type	Vertical direct drive	Seal-less pump design
Max. Flow	450 L/min	Stable circulation to filter machines
Max. Head	21 m	Handles system back pressure
Motor Power	3.75 kW	Suitable for the application
Units Installed	6	Covers the customer's pickling system
Sealing	Seal-less	No mechanical shaft seal
Certification	None required	Standard industrial application

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Project Timeline

Stage	Timeline	What Happened
Application Review	Week 1–2	Reviewed the pickling process, liquid-level changes, and piping layout
Production & Testing	Week 3–5	Six MIT-40VK-55NF pumps were customized to match the customer's connections and fully inspected before shipment
Installation & Commissioning	Week 6–7	Pumps were installed, connected, tested, and commissioned under load
Stable Operation	Month 7+	Pumps have continued running without failure and are still being monitored

03  The Result

Zero Leakage and Stable Operation for 7+ Months

Since installation and commissioning were completed in November 2025, all six MIT-40VK-55NF vertical pumps have operated continuously for more than 7 months in AAL's pickling workshop.

During this period:
● 0 leakage incidents
● 0 days of production downtime caused by the pumps
● Stable circulation of up to 450 L/min
● No pump failures requiring replacement
● Significantly less maintenance compared with the previous pumps
The vertical design also keeps the motor above the liquid level, reducing its exposure to the acid-fume environment.
At the same time, the seal-less design removes the shaft-seal leakage point, helping keep the working area cleaner and reducing EHS concerns related to acid leakage.

Customer Feedback

“Meibao pumps provide stable corrosion resistance and rarely leak during continuous operation. Compared with other brands, they need much less maintenance and have significantly reduced production downtime.”

— Patel, Director, AAL

Before vs. After

Area	Before: Horizontal Pumps	After: MIT-40VK-55NF	Result
Corrosion	Wetted parts required replacement after about 12 months	PPH wetted parts have operated for 7+ months with no reported corrosion-related failure	Longer expected service life
Acid Leakage	2–4 incidents/year	0 incidents	Leakage eliminated during the reported period
Production Downtime	15 days/year	0 days caused by pump failure during the reported period	Production interruptions reduced
EHS Risk	Repeated acid leakage created safety and environmental concerns	No reported leakage since installation	Lower leakage-related risk
Annual Pump Cost	About $500/set	About $200/set equivalent based on reported annual saving	About $300/year saving

Note: The reported 7+ month operating period confirms the current performance of the installed pumps. Longer-term service-life improvements will be evaluated as operation continues.