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When installing galvanized steel pipes, it's often necessary to connect two or more sections. Choosing the right connection method is key to ensuring stability and preventing leakage. Below are the three most common connection techniques:
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Common Connection Methods of Galvanized Steel Pipes
1. Welding Connection
Welding is a traditional method that offers strong, durable joints. Although it requires more time and skilled labor, the welded sections are less likely to leak and provide high structural integrity.
2. Grooved Clamp Connection
This method involves cutting grooves at the pipe ends and joining them with specialized clamps. It's widely used due to its fast and convenient installation. However, the quality of the clamps is critical—poor clamps can lead to leaks or structural issues.
3. Flange Connection
Flange connection involves bolting two pipe ends to matching flanges, commonly used at valves or larger-diameter pipe sections. For pipe diameters over 100 mm (DN > 100), welding flanges to the pipe ends is recommended to ensure a secure fit.
Key Precautions During Installation
To ensure reliable and leak-free connections, the following points should be observed:
Choose the Appropriate Method
Select the connection type based on pipe diameter and project design requirements.
For DN ≤ 100 mm, grooved clamp connections are often sufficient; for DN > 100 mm, flange or welded connections are preferable.
Check Thread Tightness
Before final assembly, hand-tighten threaded connections to check for proper engagement.
Leave enough margin for final tightening with tools to ensure a firm seal.
Conduct Pressure Testing
After all connections are completed, perform a water pressure test.
Inspect each joint for leaks. If any are found, mark the area, repair it, and retest until the system passes inspection.
Pipe End Preparation for Welding
Before welding, it’s advisable to cut off a short section at the pipe ends to ensure clean, solid joints and avoid misalignment during butt welding.
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