PTFE-lined tower
ASME B31.3 (Process Piping),ISO 28706 (Vitreous Enamel & PTFE Lining),ASTM D1784 (Plastic Material Standards)
ASME B31.3 (Process Piping),ISO 28706 (Vitreous Enamel & PTFE Lining),ASTM D1784 (Plastic Material Standards)
PTFE-Lined Tower Technical Specifications
1. Design Standards
Primary Codes:
ASME B31.3 (Process Piping)
ISO 28706 (Vitreous Enamel & PTFE Lining)
ASTM D1784 (Plastic Material Standards)
Structural Design:
Metallic shell per ASME VIII Div.1
Lining bond strength ≥5 MPa (ASTM D4541)
Quality Verification:
Spark test: ≥15 kV no breakdown (DIN EN 14430)
Vacuum test: -0.095 MPa held for 30 min no delamination
2. Material Specifications
Component | Material Options | Key Properties |
Shell | Carbon Steel/304/316L | Structural integrity |
Lining | PTFE (Polytetrafluoroethylene) | 2~5mm thick, corrosion-proof |
Adhesive | PFA (Perfluoroalkoxy) | Enhanced bonding strength |
Seals | Glass-filled PTFE | Low cold flow, high temp resistance |
3. Dimensions & Configuration
Diameter: DN 300 – DN 4000 mm
Max Height: ≤25 m (anti-sagging design)
Pressure Range:
Positive: ≤1.6 MPa (with stiffening rings)
Negative: ≥-0.09 MPa (requires support grids)
Temperature: -58°F ~ +392°F (short-term 446°F)
4. Key Applications
Industry | Typical Use Cases |
Chemical | HCl/HF absorption, mixed acid regeneration |
Pharmaceutical | High-purity solvent recovery, API reaction |
Electronics | Etchant gas scrubbers, ultra-pure acid cleaning |
Environmental | Fluoride exhaust treatment, plating fume towers |
5. Technical Advantages
Unmatched Corrosion Resistance: Handles aqua regia, HF, conc. H₂SO₄, etc.
Zero Contamination: FDA 21 CFR 177.1550 compliant
Non-stick Surface: Contact angle 110°, prevents scaling
Lifecycle Economy: 60% cost saving vs. Hastelloy, service life >10 years
Thermal Insulation: k=0.25 W/m·K reduces external insulation needs
6. Critical Design Prohibitions
Thermal Shock:
Heating/cooling rate ≤25°C/h to prevent lining cracking.
Mechanical Impact:
Hard object impact on lined surfaces is strictly prohibited (Mohs hardness only 3-4).
Localized Overheating:
Steam nozzles require diffusers to avoid >250°C thermal shock.
Vacuum Limit:
Metal support grids must be used when vacuum exceeds 0.095 MPa.
Lining Reinforcement:
Glass-fiber reinforced PTFE (for media containing solid particles).
Graphite-filled PTFE (enhances thermal conductivity).
Inspection Technologies:
Infrared thermography for lining bonding integrity.
Ultrasonic thickness monitoring for lining wear.
Note: Actual design requires:
Thermal stress simulation (PTFE and metal have 10× difference in thermal expansion coefficient)
Fluid dynamics analysis (prevents localized turbulent flow erosion)