1. Common Repair Methods for Leaking Cement Pipes

Common causes of cement pipe leaks include: aging joints, misalignment due to foundation settlement, cracks in the pipe, and corrosion. Depending on the type and severity of the leak, there are several main repair methods:

1. Internal Grouting (Internal Plugging)

Applicable: Suitable for leaks caused by cracks or honeycombing in the pipe body. However, it is not suitable for cases with misaligned joints or high pressure.

Method: Using a high-pressure grouting machine, a specialized sealing material such as epoxy resin or polyurethane is injected into the concrete cracks. The material expands and solidifies upon contact with water, sealing the cracks from the inside.

Advantages: This method addresses the problem from the inside without affecting the external structure of the pipe.

Disadvantages: This method requires specialized equipment and personnel, and requires high technical skills.

2. External Sealing

Applicable: For cracks or smaller holes.

Method: After cleaning the surface of the leak, apply a sealant such as quick-acting cement (Sealing King), epoxy mortar, or polymer sealant to the exterior of the pipe.

Advantages: The materials are readily available and the procedure is relatively simple. Disadvantages: Ineffective against leaks under water pressure and easily flushed open again; relatively poor durability.
3. Pipe Section Replacement
Applicable Situations: Severe pipe damage, such as large cracks or severe misalignment.
Method: Excavate the damaged pipe section and replace it with a new cement pipe or other pipe material (such as HDPE), re-joining it.
Advantages: Completely resolves the problem once and for all.
Disadvantages: Significant, time-consuming, and costly work, requiring water outages and road excavation, impacting traffic and the environment.
4. Using Emergency Repair Clamps
Applicable Situations: Rapid repair of leaking joints, cracks, or holes in pipes. This is currently the most popular and efficient repair method.

II. Advantages of Using Pipe Repair Clamps

Pipe repair clamps are a two-piece pipe repair device, typically consisting of two semicircular metal shells, an internal sealing ring, and securing bolts. Its significant advantages make it the preferred solution for emergency repairs in municipalities, water utilities, and industrial and mining enterprises.

Core Advantages:

1. Fast and efficient, significantly shortening water outages
This is its most core advantage. Traditional methods can take hours or even days, but with a repair section, preparation and installation can typically be completed within 1-2 hours, significantly minimizing the impact on user water use and making it particularly suitable for emergency repairs.
2. No water outages are required, or only temporary ones, resulting in minimal social impact.
Many repair sections are designed to operate with water running. During installation, simply reduce the network pressure or temporarily close the valve, eliminating the need to completely drain the entire pipeline. This makes it particularly suitable for critical water supply lines that cannot tolerate prolonged water outages.
3. Safe and reliable, with excellent sealing performance.
Using high-quality rubber sealing rings, tightening bolts applies pressure, ensuring a tight fit around the leaking pipe. The seal can withstand high internal water pressure and external soil pressure, ensuring a long-lasting and reliable seal.
4. Wide adaptability and a wide range of applications.
Applicable to a variety of defects: It can not only repair leaks at joints, but also effectively address longitudinal and transverse cracks and holes in pipes. Applicable to a variety of pipe materials: Not only for cement pipes, but also widely used for cast iron pipes, steel pipes, PVC pipes, HDPE pipes, and more.
Allows for some misalignment: Some specially designed repair joints (such as flexible pipe repair clamps) can compensate for a certain degree of misalignment and deflection at pipe joints.
5. Easy Installation and Low Labor Intensity
The operation is simple, typically requiring only two to three workers using common tools (such as wrenches) to complete the installation. No large, specialized equipment is required, reducing the skill requirements and labor intensity.
6. High Cost-Effectiveness
While the cost per unit of the repair joint may be higher than some traditional materials, considering its extremely short construction time, extremely low labor costs, the elimination of large-scale excavation and road repair costs, and the social benefits of reduced water outages, its overall cost is generally far lower than traditional methods such as replacing pipe sections.
7. Sturdy Structure and Long Service Life
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.

III. Installation Steps for Emergency Repair Clamps (Pipeline Repair Clamps)

1. Preparation: Close the valve, reduce the pipe pressure, and drain the foundation pit.
2. Surface Cleaning: Thoroughly clean the pipe surface around the leak, removing sludge, rust, and concrete burrs to ensure a smooth contact surface.
3. Installation: Place the two semicircular emergency repair joints over the leaking pipe and align them.
4. Tighten the Bolts: Tighten all bolts evenly, alternating between the center and the ends, to secure the upper and lower housings together and compress the sealing ring for a complete seal. Tighten to the manufacturer's specified torque. 5. Follow-up: After installation, slowly open the valve to restore water supply and observe for leaks. Once leaks are confirmed, backfill the earthwork.

Conclusion: Using a repair kit is one of the best methods for repairing cement pipe leaks, combining speed, efficiency, reliability, and cost-effectiveness. It is particularly suitable for emergency repairs that require minimizing water outage time and social impact.