According to the design specifications or the approved construction plan, the following procedures should be followed:
(1) If only galvanized seamless steel pipes are to be connected using flange welding, apply a weld brush anti-rust paint after welding. In this case, the pipe sleeves should be welded, while the flanges should be installed separately. This method ensures proper corrosion protection and ease of maintenance.
(2) If the seamless steel pipe flanges are to be galvanized after welding, a supplementary quota must be prepared and submitted to the local quota management department for approval. This is necessary because standard quotas may not cover post-weld galvanization. As a reference, the lining pipe installation quota in Volume VII can be used to estimate the additional work involved.
(3) When galvanized seamless steel pipes are used with grooved connections, the relevant fixed subhead under Volume VII should be directly applied. This approach simplifies the process and ensures compliance with existing standards.
It is important to note that all procedures must align with the project’s design requirements and local regulations. Any deviations should be documented and approved before proceeding. Additionally, ensure that all workers are properly trained in the specific methods required for each type of connection to maintain quality and safety standards throughout the installation process.
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