HK-GA Series Gas Filters – Efficient Purification for Safe Gas Transmission

Product introduction

The HK-GA Series Natural Gas Filters are designed to remove particulate matter, oil mist, 

and free water from natural gas streams through the mechanism of wire mesh collection, coalescence,

 and retention. They serve as essential purification devices for eliminating solid contaminants in gas

 transmission and distribution systems.

These filters ensure the normal operation and protection of downstream equipment including flow meters, 

pressure gauges, instrumentation regulators, pressure reducing valves, and other gas distribution devices. 

By removing harmful solid impurities, they prevent equipment damage, extend service life, 

and maintain measurement accuracy.

The HK-GA series features a simple yet robust structure, high dirt-holding capacity, stable operation, 

low initial investment, and convenient installation and maintenance—making it the ideal choice for

 gas purification applications.

Key Features

1. Multiple Structural Configurations – Available in straight-through, angle-type, cross-type,

 and other customized designs to suit various piping layouts and space constraints.

2. High Flow Capacity with Low Resistance – Optimized internal flow path design ensures large circulation 

capacity while maintaining minimal pressure drop.

3. Large Filtration Area – Extended filter element surface area reduces pressure loss and extends service intervals.

 The filter element is also easy to clean and reuse.

4. Flexible Material Selection – Standard housing constructed from carbon steel. Filter element options 

include stainless steel wire mesh, polyester, glass fiber, and other media based on application requirements.

5. Corrosion-Resistant Options – When the gas stream contains corrosive components (such as H₂S or moisture),

 corrosion-resistant materials can be selected for both housing and internal components.

6. Optional Configurations – Available with quick-opening blind plate assembly for tool-free element access, 

differential pressure gauge for real-time clogging indication, and drain valve for condensate removal.

7. Wide Medium Compatibility – Suitable for natural gas, city gas, mine gas, liquefied petroleum gas (LPG), 

air, and other non-corrosive or mildly corrosive gaseous media.

8. Diverse Application Points – Ideal for surge tank inlet filtration, regional high-pressure cabinet gas conditioning, 

CNG reduction skid pre-filtration, and city gate stations.

Product Specifications

Parameter Specification

Series HK-GA

Structural types Straight-through, angle-type, cross-type (customizable)

Housing material Carbon steel (standard); corrosion-resistant materials available

Filter element media Stainless steel mesh, polyester, glass fiber, etc.

Connection types Flanged, threaded (per customer specification)

Optional accessories Quick-opening blind plate, differential pressure gauge, drain valve, differential pressure switch

Applicable media Natural gas, city gas, mine gas, LPG, air, etc.

Application points Surge tanks, regional high-pressure cabinets, CNG reduction skids, city gate stations

Applications

1. Metallurgical Industry – Filtration for hydraulic systems of rolling mills and continuous casting machines, 

as well as lubrication equipment in steel and metal processing plants.

2. Petrochemical Industry – Separation and recovery of products and intermediate products during refining 

and chemical production processes; gas purification for catalytic cracking units.

3. Textile Industry – Purification and uniform filtration of polyester melt in fiber drawing processes; 

protection and filtration for air compressors; degreasing and dehydration of compressed process gases.

4. Natural Gas Transmission & Distribution – Pre-filtration at city gate stations, pressure regulating stations, 

and customer metering stations to protect downstream instrumentation and control equipment.

5. CNG/LPG Stations – Filtration ahead of compressors, pressure reducers, and dispensing equipment to ensure clean, 

dry gas delivery.

FAQ 

Q1: What is the working principle of the HK-GA series gas filter?

A: The filter utilizes wire mesh collection and coalescence mechanisms. As gas passes through the mesh,

 solid particles are directly intercepted, while oil mist and water droplets coalesce into larger droplets

 that separate by gravity and settle at the bottom of the filter housing for periodic drainage.

Q2: What filtration precision can the HK-GA series achieve?

A: The filtration precision depends on the selected filter element type and mesh grade. 

Stainless steel mesh elements typically provide 20–100μm filtration, while polyester and glass fiber elements

 can achieve 1–20μm precision. Please specify your required precision when ordering.

Q3: How do I select the correct structural type (straight-through vs. angle vs. cross)?

A: The selection depends on your pipeline layout and space availability. Straight-through is used for

 horizontal or vertical inline installations. Angle-type is ideal for tight spaces or changes in flow direction.

 Cross-type suits complex piping configurations. Our technical team can recommend the optimal type

 based on your installation drawings.

Q4: What is the recommended maintenance schedule for the filter element?

A: Maintenance intervals depend on gas quality and operating conditions. We recommend monitoring 

the differential pressure gauge—when the pressure drop reaches 0.05–0.08 MPa above the initial clean reading,

 the filter element should be cleaned or replaced. For critical installations, quarterly inspection is recommended.

Q5: Can the filter element be cleaned and reused?

A: Stainless steel wire mesh elements are washable and reusable—they can be removed, cleaned with 

appropriate solvent, and reinstalled. Polyester and glass fiber elements are typically disposable and should 

be replaced when clogged. Please confirm with our technical team based on your specific element type.

Q6: What materials are available for corrosive gas applications?

A: For gas streams containing H₂S, moisture, or other corrosive components, we offer corrosion-resistant 

materials including stainless steel (304/316L), duplex steel, and specialized coatings. All wetted parts can 

be upgraded to match your specific gas composition.

Q7: Is the differential pressure gauge mandatory?

A: The gauge is optional but strongly recommended. It provides real-time visual indication of filter element condition, 

allowing timely maintenance before excessive pressure drop affects system performance. For unmanned stations,

 we also offer differential pressure switches with remote alarm capability.

Q8: What is the maximum operating temperature for this filter?

A: Standard carbon steel configurations are rated for -20℃ to +80℃. For higher temperature applications, 

specialized materials and seals are available. Please consult our technical team for temperature-specific requirements.

Q9: How is condensate or separated liquid drained from the filter?

A: The filter housing is equipped with a drain port at the bottom. A manual or automatic drain valve can be 

installed to remove accumulated liquids. For applications with high liquid loading, we recommend automatic 

drains to ensure continuous operation.

Q10: Does the filter require differential pressure compensation for pressure regulators?

A: No, the filter itself does not require pressure compensation. However, we recommend installing the filter

 upstream of pressure regulators and flow meters to protect these sensitive instruments from contaminants.

 The negligible pressure drop across the filter should be accounted for in your system pressure calculations.

Q11: Is this filter suitable for high-pressure natural gas pipelines?

A: Yes, the HK-GA series is available in pressure ratings up to Class 600 (PN 10.0 MPa) and higher upon request. 

Please specify your operating pressure when ordering to ensure correct flange and shell design.

Q12: What spare parts should I keep in stock?

A: We recommend maintaining a complete set of replacement filter elements and a spare set of seals (gaskets/O-rings)

 for each filter installed. For quick-opening blind plate configurations, keep spare clamping rings and locking

 mechanisms on hand.

Product Details