Slurry Pump Frame Plate Liner Insert (FPL Insert)

Product Introduction

The slurry pump frame plate liner insert, commonly abbreviated as FPL insert and also referred to as a back liner, is a replaceable wet-end component used in many lined centrifugal slurry pump designs.

The FPL insert is located behind the impeller on the drive side of the pump wet end. Together with the volute liner and throat bush in compatible pump designs, it forms part of the internal pump chamber through which the slurry passes. Industry parts documentation commonly identifies the FPL insert as a separate wetted component rather than an assembly of the back liner, expeller and volute liner.

Because the inner surface of the FPL insert is exposed to slurry, it is subject to abrasive wear during operation. Its material, dimensions and relationship with the impeller and other wet-end components are therefore important when selecting a replacement.

Longteng manufactures metal FPL inserts for mining, mineral processing, tailings handling and other abrasive slurry applications. Replacement components can be supplied according to pump models, part numbers, drawings, dimensions, specifications or available samples.

Function of a Frame Plate Liner Insert

The FPL insert forms the drive-side liner surface behind the impeller in compatible slurry pump designs.

Its main functions include:

• Forming part of the internal wet-end chamber behind the impeller
• Providing a replaceable wear surface exposed to abrasive slurry
• Separating the slurry flow passage from the frame plate in lined pump designs
• Working with the volute liner and throat bush to form the internal wetted chamber
• Maintaining the required dimensional relationship with the impeller and surrounding wet-end components

Because the FPL insert is a wetted liner component, its wear condition should be evaluated together with the impeller and other related wet-end parts during pump maintenance.

FPL Insert, Back Liner and Expeller: What Is the Difference?

These terms should not be treated as interchangeable.

FPL Insert / Frame Plate Liner Insert

The FPL insert is the frame plate liner insert positioned behind the impeller. In slurry pump parts terminology, it is also commonly referred to as the back liner because of its location in the pump wet end.

Expeller

The expeller is a different component. It is a rotating component associated with a centrifugal shaft sealing arrangement.

It should therefore not be described as part of the FPL insert itself.

Volute Liner

The volute liner is another separate wet-end component. It surrounds the impeller and forms another section of the internal slurry passage.

In compatible lined slurry pump designs, the FPL insert, volute liner and throat bush are separate components that together form important sections of the wetted chamber.

Product Features

Drive-Side Wet-End Liner

The FPL insert is positioned behind the impeller and forms the drive-side liner surface in compatible slurry pump designs.

Wear-Resistant Metal Construction

Metal FPL inserts can be manufactured from high-chrome and other suitable wear-resistant materials for abrasive slurry service. High-chrome alloy is widely documented as a material used for metal frame plate liner inserts.

Replaceable Wear Component

The FPL insert is a replaceable wet-end component, allowing a worn liner to be replaced without treating the outer frame plate as the wear component.

Model-Specific Configuration

FPL insert dimensions, profiles and mating features vary according to pump model and wet-end configuration. Correct part identification is therefore important when selecting replacements.

Replacement Manufacturing Capability

Longteng can review replacement FPL insert requirements according to available pump models, part numbers, drawings, dimensions, specifications or existing samples.

Frame Plate Liner Insert Material Options

Because the FPL insert is a wetted liner component, material selection should consider the actual slurry and operating conditions.

Relevant factors can include:

• Slurry abrasiveness
• Particle size and shape
• Solids concentration
• Impact conditions
• Corrosive characteristics
• Existing FPL insert material
• Previous wear performance
• Pump configuration

High-chrome alloy is widely used for metal FPL inserts, while industry parts documentation also shows that frame plate liner inserts can be manufactured in elastomer and polyurethane materials for compatible pump configurations.

Because this particular Longteng page belongs to Metal Slurry Pump Parts, its product focus should remain on the metal version rather than trying to rank for rubber or polyurethane FPL inserts.

Available Metal Material Grades

Note: Final material selection should be confirmed according to the actual slurry, pump configuration and component requirements. Hardness alone should not be used as the only material-selection criterion.

FPL Insert Wear and Replacement

Because the FPL insert is directly exposed to slurry, wear can gradually change its internal surface and dimensional relationship with the impeller and surrounding wet-end components.

Wear rate can vary according to factors such as:

• Slurry abrasiveness
• Particle characteristics
• Solids concentration
• Pump operating conditions
• Material selection
• Corrosive characteristics

The FPL insert should therefore be inspected as part of wet-end maintenance rather than replaced according to a universal fixed operating interval.

Replacement should be considered according to actual component condition, pump maintenance criteria and compatibility with the surrounding wet-end components.

Applications

Metal frame plate liner inserts are used in compatible slurry pump configurations across applications including:

Mining and Mineral Processing

For pumps handling ore slurry, grinding circuit slurry and other abrasive mineral process streams.

Tailings Handling

For slurry pumps transferring tailings and other solid-containing process streams.

Coal Preparation

For compatible pumps used in coal washing and abrasive slurry transfer.

Sand and Aggregate Handling

For suitable slurry pump applications handling abrasive sand and mineral solids.

Industrial Slurry Handling

For lined centrifugal slurry pumps where a metal FPL insert is suitable for the slurry and pump configuration.

Replacement Frame Plate Liner Inserts

Correct component identification is important when sourcing a replacement FPL insert because dimensions and profiles vary between pump sizes and wet-end configurations.

Longteng can review replacement requirements using available information such as:

• Pump model and size
• Existing FPL insert part number
• Customer drawing
• Key dimensions
• Photos of the existing component
• Existing sample, if available
• Existing or required material
• Slurry application
• Required quantity

Where the original part number is unavailable, drawings, dimensions, photographs and an existing sample can help confirm the required component.

For customer-specific wet-end component manufacturing requirements, Longteng's OEM Slurry Pump Parts Manufacturer capabilities support replacement parts manufacturing according to available drawings, specifications or samples.

Manufacturing and Quality Control

Longteng has more than 20 years of experience in slurry pump and slurry pump component manufacturing.

Manufacturing capabilities include material testing, casting, heat treatment, machining and component inspection. Material composition is checked before casting, while hardness and dimensional inspection can be carried out where applicable according to component requirements.

For metal frame plate liner inserts, manufacturing control focuses on material conformity, component dimensions, mating features and compatibility with the confirmed pump configuration.

Longteng's Metal Slurry Pump Parts range includes FPL inserts and other metal wet-end and pump components for maintenance and replacement requirements.

What Information Should You Send for an FPL Insert Inquiry?

To help confirm the correct frame plate liner insert, please provide as much of the following information as available:

• Pump model and size
• Existing FPL insert part number
• Drawing or dimensional information
• Photos of the existing component
• Existing sample, if available
• Existing or required material
• Slurry application and operating conditions
• Required quantity

If you currently refer to the component as a back liner, providing the pump model, part number or component photos can help confirm whether the required part is the frame plate liner insert.

FAQ

What is a slurry pump FPL insert?

👉An FPL insert is a Frame Plate Liner Insert, a replaceable wet-end liner positioned behind the impeller in many lined slurry pump designs. It forms part of the internal wetted chamber.

Is a frame plate liner insert the same as a back liner?

👉The term back liner is commonly used in the slurry pump parts industry for the frame plate liner insert because it is positioned behind the impeller.

Is an expeller part of the FPL insert?

👉No. The expeller is a separate rotating component associated with a centrifugal shaft sealing arrangement. It should not be described as a component contained within the FPL insert.

What components work with the FPL insert in the slurry pump wet end?

👉In compatible lined slurry pump designs, the frame plate liner insert works with components such as the volute liner, throat bush and impeller to form the internal wet-end arrangement.

What materials are used for metal FPL inserts?

👉High-chrome wear-resistant alloys are commonly used for metal frame plate liner inserts in abrasive slurry applications. The appropriate material depends on slurry characteristics and the specific pump configuration.

Can Longteng manufacture replacement FPL inserts from drawings or samples?

👉Yes. Longteng can review available pump information, drawings, dimensions, specifications or existing samples to confirm replacement component requirements before manufacturing.

Send Us Your FPL Insert Requirements

If you need a replacement slurry pump frame plate liner insert, send Longteng your pump model, part number, drawing, dimensions, material requirements, photos or available sample information.

Our team can review the available technical information and confirm the component requirements before production.