Chemical Liquid Filter – Part 3: Installation & System Specification Guide

Author: James Sang

Introduction

Selecting the correct filter housing and filter element is important, but proper installation directly affects liquid performance and system reliability.

A well-designed chemical liquid system should consider:

· Working pressure

· Pipe size matching

· Installation position

· Air removal design

· Sealing material compatibility

· Static electricity protection

This section explains the key installation and specification requirements for reliable chemical liquid systems.



5.1 Select the Correct Pressure Rating

The filter pressure rating must always be higher than the actual system operating pressure to ensure safe and stable operation.

Standard Chemical Circulation Systems

Recommended Pressure Rating: 0.4 MPa

Suitable for:

· Electroplating circulation systems

· Chemical cleaning systems

· General chemical transfer

High-Pressure Applications

Recommended Pressure Rating: 0.6–1.0 MPa

Suitable for:

· Pump discharge liquid

· High-pressure chemical transfer

· Metering pump systems



5.2 Match Filter Inlet and Outlet Size

One common installation mistake is selecting a filter with smaller ports than the pipeline size.

Example:

A pump outlet of DN50 connected to a filter inlet of DN40 will cause:

· Increased flow resistance

· Higher pressure loss

· Reduced flow rate

· Increased risk of pump cavitation

Selection Rule:

The filter inlet and outlet size should be equal to or larger than the pump connection size.

Avoid unnecessary pipe reduction to maintain stable flow performance.



5.3 Choose the Correct Installation Position

The installation location depends on the liquid purpose.

Pump Suction Side

Recommended Equipment:

· Y-type strainer

· Coarse filter

Main Purpose:

· Protect pump components

· Remove large particles

· Prevent impeller and mechanical seal damage

Pump Discharge Side

Recommended Equipment:

· Precision cartridge filter

· Bag filter

Main Purpose:

· Improve liquid cleanliness

· Maintain production quality

· Remove fine particles from process fluids



5.4 Air Release Design

Some chemicals, including:

· Lithium battery electrolyte

· Hydrochloric acid

· High-temperature chemicals

· Volatile solvents

can easily generate gas bubbles.

Air trapped inside the filter housing may cause:

· Unstable flow

· Pump vibration

· Abnormal noise

· Cavitation problems

Recommendation:

Select filter housings equipped with:

· Top air vent valves

· Automatic exhaust systems

These designs help remove trapped air and improve operating stability.



5.5 Select the Correct Sealing Material

The filter O-ring and sealing materials must be compatible with the chemical being filtered.

FFKM (Perfluoro Rubber)

Recommended Applications:

· Strong corrosive chemicals

· High-purity chemicals

· Lithium battery electrolyte

· Solvent applications

Advantages:

· Excellent chemical resistance

· Long service life

· High temperature resistance

EPDM Rubber

Suitable For:

· Water

· Dilute acids

· Mild alkaline solutions

Not Recommended For:

· Strong organic solvents

· Hydrocarbon chemicals



5.6 Anti-Static Design for Lithium Battery Applications

Lithium battery electrolyte contains:

· Organic solvents

· Flammable components

· Moisture-sensitive chemicals

Therefore, liquid systems should consider anti-static protection.

Recommended designs include:

· Conductive PVDF filter housing

· Grounding connection

· Anti-static structure

These features help reduce static electricity accumulation and improve operating safety.



6. Final Chemical Filter Selection Checklist

Before selecting a chemical liquid filter, confirm the following 10 key points:

1. Chemical:
What type of chemical is being filtered?

2. Chemical Properties:
Is the liquid acidic, alkaline, solvent-based, or high purity?

3. Temperature:
What is the operating temperature range?

4. Particles:
What type and size of particles need to be removed?

5. Liquid Accuracy:
What micron rating is required?

6. Flow Rate:
What is the actual pump flow rate?

7. Pressure:
What pressure rating is required?

8. Safety Requirements:
Is anti-static protection necessary?

9. Material Compatibility:
Do the filter housing and sealing materials match the chemical?

10. Maintenance:
Is the filter replacement frequency acceptable?



Conclusion

A reliable chemical liquid system requires more than selecting the correct micron rating. Proper pressure selection, pipe matching, installation position, sealing material, and safety design are essential for long-term operation.

Correct filter installation helps protect pumps, maintain stable production quality, reduce maintenance costs, and improve safety in industries such as electroplating, PCB manufacturing, lithium battery production, semiconductor processing, and chemical manufacturing.