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When it comes to connecting galvanized steel pipes, there are several methods to consider, including threading, welding, and roll groove connections. Each method has its own set of challenges and solutions.
For roll groove connections, one common issue is cracking in the welds of the rolled grooves. To address this, flatten the inner welding ribs of the pressure groove portion of the nozzle to reduce resistance during the rolling process. Ensure the steel pipe and the rolling equipment are aligned properly, maintaining a level axis between them. Adjust the grooving speed to avoid exceeding the specified time, applying force evenly and gradually.
Another concern is the fracture of the rolled grooves in the steel pipe. Similar to the previous issue, flatten the inner welding ribs to minimize resistance. Align the steel pipe and the rolling equipment correctly and ensure they remain level. Adhere strictly to the grooving speed guidelines, applying even pressure without rushing. Additionally, inspect the width and model of the support and pressure rollers on the rolling equipment to prevent any biting issues caused by mismatched rollers. Use a vernier caliper to verify that the groove dimensions meet specifications.
The rolled grooves should meet specific criteria: the surface from the pipe end to the groove section must be smooth without unevenness or rolling marks. The groove’s center should align with the pipe wall, with width and depth dimensions adhering to requirements. Verify that the clamp model is appropriate. Lubricate the rubber sealing ring with a non-oil-based lubricant and inspect for any damage.
In terms of welded connections, a frequent issue is misalignment of the pipe ends, leading to uneven joints after butt welding. To resolve this, trim a short section of the pipe before proceeding. If the pipes still don’t fit tightly after welding, check for ovality caused by manufacturing or transport damage. Trimming and reprocessing may be necessary. Blisters at the nozzle could result from welding techniques or zinc tumors that hinder proper welding. Address these by removing excess zinc carefully.
Regarding threaded connections, random thread buckling can occur, preventing a tight seal between the pipe coupling and threads. Remove the affected section and rethread the pipe. Mismatched threads between the pipe and coupling necessitate replacing the coupling or adjusting the threading equipment. Missing threads after threading indicate potential wall thickness issues; ensure the pipe meets the required standards.
These tips aim to improve the reliability and longevity of galvanized steel pipe connections, ensuring safety and functionality in various applications. Proper maintenance and regular inspections can further enhance the performance of these connections over time.