Plug Pipe Liner

An industrial two-part Plug pipe liner/wear sleeve/screw pipe/wear bushing.

 

 

1. Specification

 

Name: Plug pipe liner/wear sleeve/screw pipe/wear bushing

Material and Chemical Composition: Cr13.

 

The required chemical composition is as follows:

Carbon (C): 0.25% - 0.35%

Chromium (Cr): 12% - 14%

Other limits: Manganese (Mn) max 1.5%, Phosphorus (P) max 0.04%, Sulfur (S) max 0.015%

 

Hardness Requirement: Hardness 35-45 HRC.

Weight: Approximately: 95.64 kg.

 

Perforated design: Uniformly distributed small holes provide efficient dewatering.

Arc geometry: Arc‑shaped liners assemble into a cylinder that matches the screw feeder housing and works with the tapered screw shaft to deliver progressive compression.

Modular construction: Segmental liners are stacked for shipment and designed for quick removal and replacement, simplifying maintenance of these high‑wear components.

 

2. Material Machining Characteristics

 

Hardness and Wear Resistance: After heat treatment to 45 HRc, the material provides excellent wear resistance. High hardness leads to rapid tool wear; carbide tools and sufficient coolant are recommended.

 

Chemical Impact: The high Chromium content (12%-14%) provides corrosion resistance but introduces "stickiness" during machining. The 0.25%-0.35% Carbon content balances strength and toughness.

 

Heat treatment: During machining, minimize thermal stress to prevent local overheating, which can change the microstructure and reduce hardness uniformity.

 

Welding: Install the components mainly using mechanical (split-type) connections; welding during assembly is not recommended. If welding is required, apply strict preheating and post‑weld heat treatment.

 

3. Functions and Roles

 

In pulp and paper production, engineered wood panels (e.g., MDF), and biomass processing, the precision-machined plug feeder parts are critical for reliable material handling:

 

1: Compression and dewatering

 

Perforated metal liners installed in the compression zone allow water and other liquids to drain as the screw advances through fibrous material (e.g., wood chips, straw).

 

2: Plug formation and sealing

 

The tapered section compresses the feed into a dense plug that forms an airtight seal ahead of high‑pressure vessels (preheaters, reactors), preventing steam backflow toward the feed end.

 

3: Wear resistance

 

Under extreme compression, liners must withstand severe abrasion. They are typically manufactured from wear‑resistant alloys with anti‑slip grooves to prevent the material from rotating with the screw.

 

4: Installation and Maintenance of the Wear Liner

 

To ensure the wear liner is installed correctly and achieves its intended service life, the following checklist has been developed based on the design requirements:

 

1. Pre-installation Phase

 

Inspect Reference Surfaces: Confirm that the equipment's main shaft and mating surfaces are clean and free of debris, ensuring there are no signs of impact or damage.

Verify Component Integrity: Confirm that the liner has been cut into two pieces (2 parties) as required by the drawing, and inspect the cut surfaces for any burrs or deformation.

Verify Markings: Ensure it aligns accurately with the equipment's rotational axis during installation.

Tool Preparation: Prepare the specialized checking jig to verify concentricity and geometric deviations after assembly.

 

2. During Installation

 

Concentricity Calibration: Monitor geometric tolerances during installation to ensure the liner's concentricity on the rotating shaft meets the design requirements.

Check Split Joint: Since this is a "2 parties" design, ensure the mating surfaces of the two halves are tightly fitted to prevent stress concentration or vibration caused by excessive gaps during operation.

Bolt Tightening and Sealing: Confirm that the bolt tension across the hole array is uniform to prevent liner deflection due to uneven load distribution.

 

3. Ongoing Maintenance

 

Maintenance pain points: High temperature, pressure, and abrasion make material hardness, corrosion resistance, and tight tolerances critical to service life.

 

Wear Assessment: Periodically inspect the liner surface, focusing on wear caused by material impact, and use the 35-45 HRc hardness standard to determine if the replacement threshold has been reached.

Geometric Deviation Monitoring: Periodically use the checking jig to measure the liner's roundness. If it does not meet the specified standard, inspect the liner for looseness or deformation.

Material Property Inspection: Observe Cr13 for pitting or cracks during routine inspections. If fine cracks are discovered, stop use immediately; welding repairs are strictly prohibited as the material may become brittle under high stress or heat.

 

5. Industry Applications

 

High-wear Plug Screw Feeder Liners are core wear parts of a Plug Screw Feeder (PSF).

 

Primary Machinery:

Plug Screw Feeder: The machine uses a tapered screw shaft and specialized liners to strongly compress and dewater loose materials, forming a dense plug that provides reliable high-pressure sealing.

 

Key Industries:

Pulp and Paper Industry: Abrasion-resistant Pulp Mill Spares. Used for raw material feeding and processing in production lines such as Chemi-thermomechanical pulp (CTMP).

Engineered Wood Industry – MDF Fiberline Maintenance Solutions. Precision‑machined plug feeder components are used in medium‑density fiberboard (MDF) production lines for the pretreatment of biomass raw materials.

Bioenergy Sector: Customized Compression Housing Liner. Utilized for the transport and sealing of biomass raw materials before they enter high-pressure reactors or preheaters.

 

Related components: These liners are commonly replaced with the Plug Screw, Wear Sleeve, and Spool Piece.

 

If you are looking for Plug Screw Feeder (PSF) parts-such as plug screws, wear sleeves, spool pieces, or plug pipe liners-please feel free to contact us. Thank you.

 

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