🧿1. How to deal with a leaking cement pipe with water?

Working with water means it's impossible to completely stop the flow, which increases the difficulty of repair. Treatment methods are tiered:

1. Temporary emergency treatment (suitable for minor leaks)

Quick sealing materials: Use materials such as underwater quick-setting cement, waterproof leak stoppers, or special rubber expansion plugs to directly seal the leak. This method is simple and quick, but generally not durable, and is mainly used to buy time for a permanent repair.

2. Permanent repair (mainstream and reliable method)

Using a special cement pipe leak repair clamp (recommended): This is currently the most common and effective method. The leak repair clamp consists of two halves with an internal sealing ring. It is bolted together to wrap around the leak, creating a permanent seal.

Inner lining repair method: For cement pipes with severe internal corrosion or poor overall condition, the entire repair can be performed using an HDPE lining (slip lining, reducing the diameter) or the CIPP in-situ curing method. This method requires high technical expertise and is costly, but it can fundamentally resolve the problem and extend the life of the pipe.

Key Tips for "Water-Carrying" Conditions:

Before installing the leak repair clamp, if the water flow is significant, you can first use the drainage method:

Use a hose or diversion tube to divert most of the water away from the leak.

While cleaning and working around the leak, the water flow is diverted, ensuring a relatively dry work surface.

While installing the leak repair clamp and sealing material, gradually seal the diversion tube.

🧿 II. Key Points for Repairing Leaky Cement Pipes

The success of a cement pipe repair depends on careful attention to detail. The following are essential points:

1. Surface Preparation (The Most Critical Step)

Thorough Cleaning: Mud, moss, loose cement fragments, and all other debris around the leak must be removed.

Roughening: Use a chisel or electric hammer to roughen the surface of the repaired area to reveal a solid, fresh base. This significantly improves the adhesion of the sealing material or leak repair clamp to the pipe.

Drying: Even when working with water, the work surface should be wiped dry as much as possible with a towel, sponge, or other tools, or water-insensitive materials such as quick-drying cement should be used.

2. Selecting the Correct Sealing Material

It is essential to choose specialized materials suitable for wet surfaces or underwater curing, such as polymer waterproofing membranes, underwater epoxy mortar, and flexible sealants.

3. Selecting and Installing the Leak Repair Clamp

Size Matching: Accurately measure the outer diameter of the pipe and select a leak repair clamp that exactly matches the pipe's dimensions. The inner diameter of the leak repair clamp should be slightly smaller than the pipe's outer diameter to ensure sufficient holding force.

Widebody Design: For uneven surfaces like cement pipes, a wider leak repair clamp is preferred, providing a larger contact and sealing area to compensate for surface irregularities.

Symmetrical Tightening: When tightening bolts, tighten them diagonally, in stages, and gradually to ensure uniform force on the sealing ring and avoid unilateral stress that could cause a leaky seal.

4. Post-Repair Curing

Regardless of the material used, sufficient curing time must be provided according to the product instructions (especially for cement-based materials). During this period, avoid allowing water to flow through the pipe or subjecting it to water pressure shock.

🧿 3. Advantages of Using Leak Repair Clamps to Repair Cement Pipes

Compared to traditional methods like bricklaying and cementing, using leak repair clamps to repair cement pipes offers significant advantages:

1. Fast Installation, No Curing Required

Leak repair clamps can typically be installed within a few hours, and water flow can be quickly restored. Traditional cement mortar, on the other hand, requires a longer curing period (often over 24 hours), during which the pipe cannot be used.

2. Strong Water-Resistant Operation Capability

The design and sealing ring material of the specialized leak repair clamp are highly adaptable to humid environments. Combined with drainage, they can achieve effective sealing even in wet environments, a feature difficult to achieve with traditional cement mortar.

3. Reliable Sealing and Flexible Connection

The leak repair clamp's rubber sealing ring provides a flexible seal that can adapt to slight deformation and displacement of the pipeline due to temperature fluctuations, foundation settlement, and other factors, effectively preventing secondary leaks caused by stress changes. Rigid cement plugging is susceptible to re-cracking under such stress.

4. Corrosion Resistance and Long Lifespan

The leak repair clamp's housing is typically made of ductile iron or stainless steel, and the sealing ring is made of age-resistant materials such as EPDM. The clamp's overall resistance to acid and alkali corrosion is excellent, and its service life far exceeds that of temporary plugging systems.

5. High Compressive Strength

Ductile iron leak repair clamps, in particular, offer exceptional structural strength, effectively resisting external soil pressure and internal water pressure, while also reinforcing the pipeline itself.

6. Easy Operation and Low Labor Costs

No specialized skills (such as welders) are required; ordinary maintenance personnel can operate these clamps with minimal training, reducing reliance on highly skilled labor and labor costs.

The housing is typically made of metals such as ductile iron and carbon steel, which are corrosion-resistant and high-strength. It can last the same life as the original pipe, eliminating the need for frequent repairs. Baoshuo brand carbon steel half joints are available in a variety of rubber materials, including NBR, EPDM, FKM, and silicone rubber. The half joint body is available in Q235 carbon steel and 304 and 316L stainless steel.

The following are Baoshuo brand oil-resistant pipe repair clamps, high-temperature-resistant pipe repair clamps, acid- and alkali-resistant pipe repair clamps, stainless steel pipe repair clamps, high-pressure-resistant pipe repair clamps, and large-diameter pipe repair clamps.

Summary

For cement pipe leaks, especially those in difficult conditions involving water, using specialized cement pipe repair clamps is currently the most effective, reliable, and cost-effective method. The key to its success lies in meticulous surface preparation and standardized installation techniques. This method perfectly balances speed, durability, and workability, making it the preferred solution for cement pipe repair in municipal, water conservancy, and industrial sectors.