🧿 Ductile Iron Pipe Heat Resistance and High-Temperature Leakage Treatment

Heat Resistance of Ductile Iron Pipe

Due to its unique material properties, ductile iron pipes perform well in a variety of operating conditions. Their heat resistance is a key concern for many users.

Characteristic Dimensions: Specific Parameters or Performance: Notes/Application Conditions

Material Intrinsically High-Temperature Resistance: Withstands temperatures exceeding approximately 1000°C. Regarding the pipe material itself.

Operating Temperature of Heating Pipes: The upper limit for hot water delivery is generally 130°C. Prefabricated insulated pipes with an integrated structure and outer sheath.

Operating Temperature of Pipe Fittings: The operating temperature range for pipe fittings used in water supply, drainage, and gas pipeline systems is typically -45°C to 150°C. The media used are water, oil, etc.

Applicable Temperature of Leak-Proofing Agents: Some specialized leak-proofing agents (such as Guangben 8-type spherical cast leak-proofing agent) are typically applicable at temperatures ≤ 80°C. Please refer to the specific product instructions.

High-Temperature Media Transportation: If the vaporization temperature of the transported media exceeds 1000°C, reselection is required. The corrosiveness (pH value) of the media should also be considered.

🧿Aspects to Note:

Long-Term High-Temperature Effects: Although ductile iron pipes can withstand high temperatures, prolonged exposure to high temperatures, especially in conditions with large temperature fluctuations, may affect their metallographic structure and mechanical properties (such as toughness and strength), accelerating fatigue aging. For example, pipe molds can develop thermal fatigue cracks when repeatedly exposed to molten iron at 1300-1450°C.
System compatibility: When selecting a suitable pipe, consider the temperature resistance of pipe joint sealing materials (such as rubber seals), the temperature resistance of internal and external anti-corrosion coatings, and the effectiveness and heat resistance of the insulation layer.

🧿Repairing Methods for Ductile Iron Pipe Leaks at High Temperatures

If a ductile iron pipe leaks at high temperatures, select an appropriate repair method based on the leak, system pressure, and temperature, ensuring safety precautions.

Comparison of Repair Methods

Repair Method Principle Applicable Temperature/Pressure Conditions Advantages Limitations

Specialized High-Temperature Sealant: Knead and mix by hand, then press or apply to the leak site. Hard as steel after curing. For example, Guangben Type 8: Temperature ≤ 80°C; Pressure ≤ 0 MPa during application, ≤ 1.0 MPa after curing. Relatively simple to use; environmentally friendly and harmless; Some can be applied with minimal pressure. Limited effectiveness against leaks at excessively high temperatures or pressures; High-temperature-resistant models are required.

Pressure-wrapped patching technology: A combination of waterproof tape, clamp outer ring, and grouting material forms a sealed enclosure. It can be operated under pressure, with specific temperature and pressure resistance depending on the selected materials. No welding is required, avoiding welding thermal stress and the risk of safety accidents; repairs can be performed under pressure, minimizing downtime. The operation involves a number of steps and requires high operator skill.

High-Temperature Leak Repair Clamps: Made of high-temperature-resistant materials (such as stainless steel) and sealing elements, they mechanically wrap around the leak site. Depending on the design and material of the leak repair clamp, higher temperature resistance (e.g., up to 300°C or higher) can be achieved. Fast and reliable; highly adaptable; no downtime or load reduction required; no hot work required, safe; reusable. Initial investment may be relatively high; spare parts appropriate to pipeline specifications are required.

General Precautions for Repair Operations

1. Temperature and Pressure Reduction: If operating conditions permit, appropriately reducing the temperature and operating pressure within the pipeline can significantly improve the safety and success rate of the repair operation.

2. Surface Preparation: Before repairing, remove rust, dirt, and old coatings around the leaking area to ensure a good bond between the repair material and the pipe wall.

3. Personal Protection: When performing high-temperature pipeline repair work, operators must wear heat-insulating gloves, protective clothing, goggles, and other protective equipment to prevent burns and injuries.

4. Follow Product Instructions: When using any sealant or repair material, strictly follow the operating procedures and conditions specified in the product manual.

5. Follow-up Observation: After the repair is completed, observe and monitor the repaired area for a period of time. The repair is considered successful only when no leaks are confirmed.

🧿Benefits of Using High-Temperature Leak Repair Clamps

High-Temperature Leak Repair Clamps (also known as Emergency Repair Clamps) are designed specifically for quickly repairing pipeline leaks, particularly suitable for high-temperature operating conditions.

1. Fast and Reliable, Reducing Downtime and Losses: Leak repair clamps are sophisticatedly designed and typically install in just a few minutes, significantly reducing downtime and minimizing production interruptions or energy losses caused by leaks.
2. Versatile, Addressing a Variety of Leaks: High-quality high-temperature leak repair clamps effectively address a wide range of leak types, including cracks, holes, pinholes, and joint leaks.
3. No Hot Work Required, Safe Operation: Mechanical fastening (e.g., bolts) eliminates the risks associated with welding (such as explosions and thermal stress affecting pipe materials), making them particularly suitable for flammable and explosive environments or where hot work is prohibited.
4. No System Downtime Required, Minimizing System Impact: Many well-designed leak repair clamps support under-pressure repair, eliminating the need to completely shut down the system or drain the medium. This is particularly important for continuously operating thermal systems.

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 and Recommendations

Ductile iron pipes generally have good temperature resistance, but their specific application limits are affected by the pipe structure, anti-corrosion and insulation measures, and the medium being transported. For high-temperature heating applications, prefabricated insulated ductile iron pipes that meet national standards are a reliable choice.

If a high-temperature pipe leak occurs:

Evaluate the leak: Identify the leak point, temperature, pressure, and impact on the system.

Select the appropriate method: Based on the evaluation results, choose a specialized leak-proofing agent, pressurized patching technology, or a high-temperature leak repair clamp.

Prioritize safety: Exercise caution when reducing temperature and pressure, as well as personal protection.

For critical pipelines or complex situations, it is recommended to contact professional pipeline maintenance personnel for assistance.