Abrasion thinning perforation failure means the process medium containing solid particles continuously scours and rubs the inner wall of PFA lining during long-term circulation. The fluoroplastic material is gradually worn and removed layer by layer, leading to uniform reduction of lining thickness. When the local wall thickness is worn through completely, corrosive medium directly invades the bonding interface between lining and metal base pipe, causing large-area lining peeling and rapid corrosion penetration of the steel pipe. This failure belongs to cumulative mechanical wear damage, mostly appearing in material conveying pipelines with solid powder, crystal particles and tiny sediment impurities.
1. Abrasion Progressive Material Loss Mechanism
PFA has good chemical inertness but limited wear resistance against hard particle erosion. Solid impurities suspended in the fluid continuously collide and scrape the lining surface under the driving of medium flow. Micro cutting occurs on the fluoroplastic surface, and tiny material chips fall off with the fluid, resulting in slow and continuous thinning of the lining. Elbows and flow turning positions suffer directional impact wear, forming obvious local groove-shaped thinning areas preferentially. Once the lining is worn through, the sealing barrier fails, and corrosive liquid permeates the gap to destroy the original sintered adhesion. Different from one-time puncture caused by large foreign bodies, this damage is formed by long-term micro particle cumulative erosion rather than single instantaneous penetration.
2. Typical Positions Prone to Abrasion Damage
Inner arc surface of elbows where particle flow changes direction and produces concentrated impact scouring;
Tee branch inlet where mainstream particles split and strike the side wall lining;
Reducer pipe sections with accelerated flow velocity and intensified erosion strength;
Horizontal pipe bottom where particles settle and slide along the pipe wall for a long time;
Pump inlet and outlet straight pipes with the highest flow turbulence and strongest friction effect.
3. Core Inducing Factors Accelerating Abrasion Failure
The medium contains a large amount of crystalline precipitates, mineral dust and wear-resistant solid impurities without filtration;
Excessively high medium flow rate enhances the kinetic energy of particles and aggravates cutting wear;
The original lining design thickness is too thin, lacking sufficient wear allowance margin;
Long-term continuous operation without regular medium filtration and pipeline cleaning;
Serious turbulence and vortex dead zones in pipeline structure leading to repeated cyclic scouring.
4. Full-Link Prevention and Control Technical Measures
① Install multi-stage precision filter and slag trap at the front end of the pipeline
Intercept solid particles from the source to cut off the abrasion medium.
② Limit the medium flow rate within the wear-resistant design range
Reduce particle impact force to slow down material removal speed.
③ Adopt wear-resistant modified filled PFA lining for easy-abrasion pipe fittings
Add inorganic filler to improve surface hardness and anti-scouring performance.
④ Optimize pipeline layout to reduce abrupt turning and sudden diameter change structures
Lower local turbulence and concentrated erosion areas.
⑤ Arrange regular endoscopic wall thickness detection for key wear sections
Replace severely thinned pipelines before perforation happens.
5. Prevention Effect Comparison Table
表格
| Design & Operation Mode | Abrasion Perforation Risk | Application Suggestion |
|---|---|---|
| No filtration interception + high flow velocity + ultra-thin lining | Lining penetrating leakage occurs within medium service cycle | Add filtering equipment and replace with wear-resistant enhanced lining pipe fittings |
| Front-end impurity filtering + flow rate control + periodic thickness inspection | Effectively slow cumulative abrasion thinning of lining | Standard design specification for particle-containing medium PFA lined heating pipelines |
| Wear-resistant modified lining + streamline pipeline layout + online wear monitoring | Extremely low erosion perforation hidden danger | Preferred scheme for long-term solid-liquid mixed phase conveying anti-corrosion heating equipment |
Conclusion
PFA lining abrasion thinning perforation failure is caused by long-term scouring and cutting of solid impurities in the medium, resulting in gradual material loss and through-wall damage of the anti-corrosion layer. The core prevention ideas are blocking particulate impurities through filtering facilities, controlling flow velocity to weaken erosion effect, upgrading wear-resistant lining materials, optimizing pipeline flow field structure and carrying out regular thickness inspection. Whole-process control of medium pretreatment, pipeline structural design and daily inspection maintenance can eliminate pipeline leakage and equipment shutdown risks induced by abrasive wear of PFA lined heating tubes.
