Galvanized steel pipe connection methods include threading and welding. Another commonly used technique is the grooving connection, which requires careful attention to detail to ensure a secure and leak-free joint.
Groove Connection
(1) Cracking of Groove Welds
Flatten the internal weld ridge on the pressure groove section of the nozzle to reduce resistance during grooving.
Adjust the alignment of the steel pipe and the grooving equipment to ensure both are level and properly positioned.
Control the grooving speed, making sure that the forming time does not exceed the recommended duration. Apply even and gradual force throughout the process.
(2) Fracture of Grooved Steel Pipes
Remove the internal weld ridge on the pressure groove area of the pipe nozzle to minimize resistance and improve groove quality.
Ensure proper alignment between the steel pipe and the grooving equipment, keeping both in a straight and level position.
Control the grooving speed to stay within specified limits and apply force evenly and slowly.
Check the width and model of the support and pressure rollers on the grooving machine to avoid misalignment or biting issues between the two rollers.
Use a vernier caliper to verify that the groove dimensions meet the required specifications.
(3) Requirements for Grooves Formed by the Grooving Machine
The surface from the pipe end to the groove should be smooth, free from irregularities and rolling marks.
The center of the groove must be concentric with the pipe wall, and the groove width and depth should comply with the standards. Confirm that the correct clamp model is being used.
Apply a suitable lubricant to the rubber sealing ring and inspect it for any damage. Avoid using oil-based lubricants, as they may compromise the seal.
Welded Connection
If the galvanized steel pipe ends are not aligned straight after butt welding, causing an angled cut, it’s advisable to trim a small portion of the pipe before reprocessing.
If the welded joint appears uneven or the pipe becomes oval due to manufacturing defects or transportation damage, consider cutting off a small section and reprocessing the pipe.
Blisters at the nozzle after welding can occur due to improper welding techniques. Ensure proper heat control and follow recommended procedures.
A zinc tumor at the nozzle can lead to welding challenges and potential defects. For large or excessive zinc tumors, perform a removal treatment before proceeding with welding.
Threaded Connection
If the thread is randomly twisted or not fully engaged, cut off the affected section and re-thread the pipe properly.
If the threads on the steel pipe and the fitting do not match, replace the fitting or adjust the threading equipment and re-thread the pipe.
If there is missing thread after processing, measure the pipe wall thickness to ensure it meets the required standard for threaded connections.
Proper installation and maintenance of galvanized steel pipes are essential for long-term performance and system integrity. Always follow manufacturer guidelines and industry best practices to ensure safe and reliable connections.
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