FPZ corrosion resistant self priming pump

FPZ Series Corrosion-Resistant Plastic Self-Priming Pump

Model NO. FPZ Series Corrosion-Resistant Plastic Self-Priming Pump

Inlet & Outlet Size: DN25 – DN100

Flow Range: 2.5 – 100 m³/h

Head Range: 10 – 32 m

Motor Power : 0.55 – 18.5kW

Suction Lift: 3m

Speed: 2900r/min

Voltage: 220V / 380V / 415V / 440V / 460V

What is FPZ Series Corrosion-Resistant Plastic Self-Priming Pump？

The FPZ series is a high-performance chemical pump engineered from one-piece molded RPP/FRPP plastic to safely handle aggressive, corrosive fluids. Functioning as a reliable chemical transfer pump, it lifts acidic and alkaline liquids from underground sumps, storage tanks, or neutralization pits without requiring a suction foot valve. Designed as an industry-leading option among chemical resistant pumps, it utilizes an advanced internal gas-liquid separation chamber for rapid self-priming, serving as a superior alternative to traditional vertical submerged pumps within operating temperatures from 14°C to 80°C.

Features & Working Principles

Integrated One-Piece Structure: Combines an internal fluid reservoir, gas-liquid separation chamber, and backflow check valve into a single compact casing.
One-Time Priming Operation: Fill the casing chamber once prior to initial startup—no repeated priming required for daily start-and-stop routines.
Automatic Air Purging: Built as a smart chemical pump, it handles minor air ingestion during operation and automatically resumes normal liquid flow.
Self-Lubricating Seal System: Uses the pumped liquid to cool and lubricate the mechanical seal, eliminating the need for external flushing water.
5-Meter Suction Lift Capacity: Delivers a reliable self-priming lift height of 4–5 meters (13–16.4 ft) under standard water working conditions.

Applications & Industry Uses

These industrial chemical resistant pumps are ideal for installations where liquid levels rest below the pump inlet or where installing foot valves is impractical:

Electroplating & Surface Treatment: Tank circulation, pickling acid extraction, and rinse bath transfer.
Wastewater & Environmental Protection: Trench wastewater handling, neutralization delivery, and acid-base effluent lifting.
Fine Chemical Industry: Reaction kettle discharging, raw acid/alkali dosing, and batch circulation using a dedicated chemical transfer pump.
Pharmaceutical & Food Processing: CIP cleaning solutions, mild acid sanitizers, and chemical dosing routines.
Metals & Pickling Lines: Acid bath extraction, inorganic salt liquor transfer, and chemical recycling systems.

Operation & Maintenance

Strictly prohibit dry running: No-load operation must be ≤30 seconds; stop the pump immediately if water supply is cut off.
Motor selection: When the medium specific gravity is >1.2, motor power must be increased to prevent motor burnout from overload.
Mechanical seal leakage: Fine-tune the mechanical seal tightening screws; if severely worn, replace the mechanical seal directly.
Long-term shutdown: Drain the remaining liquid inside the pump body when not in use for a long time to prevent crystallization from corroding the pump body.

Corrosion Resistant Plastic Self Priming Pump FPZ Series Exploded View and Component Layout | JPZX

Model	Flow Rate (m³/h)	Head (m)	Speed (r/min)	Suction Lift (m)	Self-priming Time (s/m)	Power (kW)	Inlet/Outlet Dia. (mm)	Coupling Type	Weight (kg)
25FPZ-10	2.5	10	2900	3	60	0.55	25/25	Direct-coupled	14
32FPZ-11	3.5	11	2900	3	60	0.75	32/32	Direct-coupled	14
40FPZ-18	11	18	2900	4	60	1.5	40/32	Direct-coupled	24
50FPZ-20	13	20	2900	4	60	2.2	50/40	Direct-coupled	27
65FPZ-28	20	28	2900	4	60	4	65/50	Direct-coupled	50
80FPZ-28	50	28	2900	4	60	5.5	80/65	Direct-coupled	75
80FPZ-32	50	32	2900	4	60	7.5	80/65	Direct-coupled	80

Q1: Do I need to fill the pump with liquid every time before starting?

No. You only need to prime the pump chamber with liquid once during the very first installation. After that, the integrated self-priming structure and check valve retain enough liquid inside to automatically evacuate air from the suction pipe (up to 3 meters lift) on every subsequent start.

Q2: Why is plastic (RPP/PVDF) preferred over metal for handling acidic or alkaline solutions?

Engineered plastics offer superior chemical resistance against strong acids, weak alkalis, and inorganic salts that rapidly corrode cast iron or standard stainless steel. Additionally, plastic components are lighter, lower in cost, and prevent liquid contamination caused by metal ion dissolution.

Q3: What precautions should be taken regarding the mechanical seal when pumping corrosive fluids?

Chemical corrosion and dry friction are the primary causes of seal failure. Always ensure the pump chamber contains liquid before starting to prevent seal burning. For liquids containing fine crystallization or light impurities, we recommend configuring an external water-cooled or double-end mechanical seal to prolong service life.

Q4: How does the liquid temperature limit affect the material selection for the FPZ series?

Material selection depends heavily on fluid temperature:

Reinforced Polypropylene (RPP): Suitable for standard corrosive fluids within -10°C to 80°C.

PVDF (Fluoroplastic): Required for highly aggressive acids or higher operating temperatures up to 100°C.

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