How to connect ductile iron pipes
Ductile iron pipes are widely used in water supply and drainage, gas transportation and other fields because of their high strength, corrosion resistance and good sealing properties. There are various connection methods, and the appropriate process needs to be selected according to the engineering requirements. The following is a summary of popular discussions and technical points on ductile iron pipe connections in the past 10 days across the Internet.
1. Comparison of common connection methods
| Connection method | Applicable scenarios | Advantages | Disadvantages |
|---|---|---|---|
| socket connection | Water supply and drainage, municipal engineering | Good sealing and easy installation | Requires special rubber ring |
| Flange connection | High-pressure pipelines and maintenance sections | Detachable, high pressure bearing | higher cost |
| Mechanical connection | Construction in small spaces | No welding required, high flexibility | Fasteners need to be inspected regularly |
2. Operation steps of socket connection
1.Preparation: Check whether the pipe socket, spigot and rubber ring are intact, and clean impurities on the contact surface.
2.Install rubber ring: Insert the rubber ring into the socket groove and apply lubricant (usually soapy water).
3.Docking section: Use a lifting device to align the socket with the socket, and slowly insert it to the marked line.
4.Seal test: After passing water, check whether the interface is leaking. The pressure must reach 1.5 times the design value.
3. Key points of flange connection technology
| steps | Things to note |
|---|---|
| Flange welding | Using E5015 welding rod, the interlayer temperature is controlled to ≤200℃ |
| Bolt tightening | Tighten three times in diagonal order. The torque value refers to GB/T 9124. |
| Gasket | The thickness of asbestos rubber pad should be 3-5mm |
4. Solutions to common construction problems
1.The interface is leaking: Mostly caused by the displacement of the rubber ring, it needs to be reinstalled and special fixing glue is used.
2.Pipes are not concentric: Use hydraulic straightening machine for correction, the deviation should be <3mm/m.
3.Flange seal failure: Check whether the gasket compression reaches 40%-50%.
5. Latest Industry Trends
According to recent industry forum discussions, newSelf-locking socket joint(with anti-theft function) is increasingly used in gas pipelines, and the installation efficiency is increased by 30%. Another manufacturer launchesEpoxy coal pitch anti-corrosion+The composite process of socket connection is suitable for high saline-alkali areas.
Summary: The connection of ductile iron pipes requires comprehensive consideration of media pressure, construction environment and other factors. The socket type is suitable for most buried pipelines, the flange connection is more convenient for maintenance, and the mechanical joint has obvious advantages in emergency projects. It is recommended to conduct connection process tests before construction to ensure project quality.
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