A leak in a DN3000 (3-meter diameter) fiberglass reinforced plastic pipe (FRP) in a straight section is a major engineering accident, requiring a targeted repair plan based on the cause of the leak, the extent of the damage, and the operating conditions. The following is a system analysis and repair guide.

🔍 1. Leakage Cause Analysis (Combining Structural Characteristics and External Factors)

Production Process Defects

- Uneven Sand Interlayer: Free-fall filling of quartz sand can easily lead to loose pipe walls and stratification. The risk of stratification is higher when the sand content exceeds 30%, making it prone to rupture at weak points under pressure.

- Substandard Impermeable Layer: When the resin lining thickness is less than 0.5mm, it is unable to effectively block media penetration, resulting in "sweating" during pressure testing.

External Mechanical Damage

- Construction Damage: Excavator impacts and direct impacts from rocks during backfill (failure to lay a sand cushion as specified) can cause cracks in the pipe.

- Improper Transportation: Failure to use soft slings during lifting or the lack of wooden cushioning during long-distance transportation can cause hidden cracks. Design and Installation Issues

- Stress Concentration: Water hammer vibrations on large-diameter pipes (DN ≥ 1000) generate thrust at elbows and flanges, leading to joint disconnection or pipe rupture. Elbow repair clamps are used to repair elbow leaks.

- Insufficient Burial Depth: Failure to meet design requirements or lack of steel casing protection across a highway can cause deformation and leakage due to ground loads.

Environmental and Operational Factors

- UV Aging: Long-term exposure to sunlight degrades the surface resin, causing peeling and weakening of the structure.

- Overpressure Operation: Operational errors (such as valves accidentally closing and holding pressure) can exceed the design pressure (usually ≤ 1.0 MPa), resulting in instantaneous impact and cracking.

🔧 II. DN3000 Fiberglass Pipe Leak Repair Plan (Classified by Damage Severity)

For DN3000 Fiberglass Pipe leaks, repairs using half-joint clamps can be performed under water and pressure without shutting off the water.

  Changzhou Baoshuo Pipe Fittings can customize any large-diameter repair clamps, DN3000 straight pipe repair clamps, and DN3000 fiberglass pipe socket connection leak repair clamps.