Fluorine-lined centrifugal pumps are mainly used to transport corrosive chemical media. Since the corrosion-resistant fluoropolymer lining (PTFE or FEP) is applied to the inner wall of the pump and key flow parts (impeller, housing, etc.) through high-temperature sintering, a dense protective layer is formed, which completely isolates the contact between the medium and the metal. This enables the fluorine-lined centrifugal pump to resist the erosion of a variety of chemical substances, making it the "industry darling" for corrosive fluid transportation.

 

I. Applicable media for fluorine-lined centrifugal pumps

Fluorine lined centrifugal pump

1. Strong acids

Typical examples: concentrated sulfuric acid, hydrochloric acid, nitric acid, hydrofluoric acid, phosphoric acid

 

2. Strong alkalis

Typical examples: sodium hydroxide (caustic soda), potassium hydroxide, ammonia

 

3. Organic solvents

Typical examples: benzene, acetone, carbon tetrachloride, ester solvents

 

4. High purity and food grade applications

Main application scenarios: electronic grade hydrofluoric acid, pharmaceutical intermediates, food additives

 

II. Main advantages of fluorine-lined centrifugal pumps

Fluorine lined centrifugal pump

1. Excellent chemical stability

The fluorine polymers in fluorine-lined centrifugal pumps are "immune" to more than 200 chemicals, especially in mixed acid environments (such as nitric acid + HF pickling solution) and alternating corrosion conditions.

 

2. Wide temperature range

Low temperature performance: PTFE lining of fluorine-lined centrifugal pumps remains flexible at -196°C (suitable for liquid nitrogen delivery)

High temperature resistance: FEP material of fluorine-lined centrifugal pumps can withstand 150°C continuously and short-term temperature resistance up to 200°C (e.g. hot concentrated sulfuric acid)

 

3. Enhanced comprehensive performance

Impenetration resistance: High crystallinity and tight molecular structure prevent medium penetration

Wear resistance: Carbon fiber/glass fiber modification triples wear resistance

 

4. Cost-effectiveness

Service life: 5-8 years for fluorine-lined centrifugal pumps (the longest among corrosion-resistant chemical pumps)

Reduced maintenance: fluorine-lined centrifugal pumps have fewer wearing parts, enhanced durability, and lower TCO

 

III. Operational considerations for fluorine-lined centrifugal pumps

Fluorine lined centrifugal pump

1. Material compatibility

Avoid:

Reactive media (molten alkali metals: Na, K)

Certain fluorinated solvents (e.g., perfluoroethers that cause expansion)

 

2. Operational limits

Temperature threshold: PTFE ≤180°C, FEP ≤150°C

Solid content: When the solid content exceeds 5%, use an open impeller or wear-resistant lining

 

3. Key practices

Prevent dry running of fluorine-lined centrifugal pumps (fluorine polymers have poor thermal conductivity and there is a risk of overheating)

Drain the medium thoroughly during long shutdowns to avoid crystal accumulation

 

Professional consultation is recommended

For the best selection of fluorine-lined centrifugal pumps, consult a certified engineer or technical expert. Changyu Pumps and Valves - a leading manufacturer of fluorine-lined centrifugal pumps - is ready to provide tailor-made solutions!