Selection And Installation Guidelines For Fluorine-lined Reducing Tees

To select ptfe lined pipe for corrosive or high-purity systems: specify liner thickness ≥3mm, choose isostatic molding for void-free liners, and verify full encapsulation at branch connections. For reducing tees, confirm branch-to-run ratio and continuous liner from run to branch without exposed metal. This prevents ion leaching, handles media up to 150°C, and eliminates crevice corrosion.

Corrosion and Contamination Risks

Standard metal pipes corrode in acids or halides, releasing ions that contaminate products. A ptfe lined pipe replaces metal‑fluid contact with an inert PTFE barrier, stopping wall thinning and ionic contamination. In high‑purity water or semiconductor lines, trace ions degrade quality.

• PTFE liner resists hydrochloric acid, sulfuric acid, and organic solvents.

• Liner prevents particle generation from corrosion.

Liner Manufacturing Methods

PTFE liners are produced by various processes:

• Isostatic molding – Uniform pressure creates dense, void‑free liners with minimal permeation for critical purity.

• Hydrostatic forming – Fluid pressure expands liner into pipe; suitable for standard services but may have thickness variations.

• Paste extrusion – For small diameters; produces seamless liners with good surface finish.

Liner thickness: 3–5mm based on pipe size and service (3mm for general, 5mm for high pressure or vacuum).

PTFE Lined Tee: Branch Connections

A ptfe lined tee connects branch to main with full liner coverage.

• Reducing tee – Branch smaller than run; used where a smaller line feeds a reactor or tank.

• Equal tee – All openings same size; splits flow evenly.

• Liner continuity – Liner runs continuously from run into branch without exposed metal, eliminating crevice corrosion and contamination points.

Branch orientation (straight or angled) must match layout. PTFE lined pipe fittings (tees, elbows, reducers) are available in Schedule 40/80 to match steel pipe dimensions.

PTFE Lined Fittings: System Integrity

Every fitting must maintain the same chemical resistance as straight pipe. PTFE lined fittings include:

• Elbows (90°, 45°) – Change direction without metal exposure.

• Reducers – Transition sizes with full liner.

• Flanges – Bolted connections with PTFE facing for leak‑tight joints.

• End caps – Seal pipe ends for future expansion.

All ptfe lined fittings require proper gaskets and bolting per pressure/temperature ratings. Handle carefully to avoid liner damage.

Selection Criteria Summary

Temperature and Pressure Limits

• PTFE liners – max 150°C (302°F)

• PFA liners – max 180°C (356°F)

• Pressure per ANSI B16.5 or EN 1092‑1

• Vacuum service – requires reinforcement for full vacuum (‑0.1 MPa)

• Minimum liner thickness – 3mm for corrosive; 5mm for high pressure/vacuum

Installation Guidance

• Handling – Protect liner from scratches; inspect flange faces before bolting.

• Bolting – Use torque wrenches; follow specified sequence and values.

• Thermal expansion – PTFE expands more than steel; install expansion loops/guides.

• Flushing – Flush line with clean water/solvent before commissioning.

Final Selection Logic

For corrosive or high‑purity piping needing branch connections:

1. Define fluid composition, temperature, and pressure.

2. Choose PTFE for general chemicals; PFA for higher temp or lower permeation.

3. Specify fitting type (reducing tee, equal tee, elbow, reducer, etc.).

4. Confirm manufacturing method (isostatic for critical purity).

5. Verify pressure rating and flange standard.

6. Plan thermal expansion and supports.

This approach ensures a ptfe lined pipe system delivers corrosion‑free, contamination‑free service. The combination of PTFE liner and proper fittings provides complete system integrity.

FVF PTFE Lined Reducing Tee

• Its working temperature is high at the range of -29°C-180°C; except the molten alkali metals, element fluorine and aromatic hydrocarbon, lined products can be used in any chemical medium.
• Vacuum resistance. In the range of -29°C-150°C, it is applicable for vacuum condition. In chemical production, the vacuum condition occurs due to cooling, longitudinal emissions, or medium backflow. 
• It is high-pressure resistant . Within temperature working condition, it can sustain the working pressure of 3.0MPa.
• It is penetration Resistant.It has excellent antiosmosis by adapting the high-quality PTFE and making it of high density and enough thickness after advanced lining processing.
• PTFE advanced lining molding process achieved the status of syn chronous hot expansion or cold shrinkage for steel components and fluorine plastic. 

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