Municipal project pipe invited tenders, steel bellows bidding parameters reference

In the invited tenders of pipes for municipal water supply and drainage, sewage and other engineering projects, steel bellows have become one of the popular choices due to their structural strength and corrosion resistance. In order to help the invited tenders clarify the parameter requirements and the bidders accurately respond to the bids, the following provides professional parameter reference directions.

The first is the core mechanical parameters. Ring stiffness is a key indicator, and the corresponding grade should be selected according to the project section: SN8 can be used under general municipal non-motor vehicle lanes and green belts, and SN12.5 or SN16 should be selected under motor vehicle lanes to ensure that the pipeline does not deform when subjected to road load.

In terms of raw materials, it is necessary to specify that the main body of the pipe should be made of high-density polyethylene that meets the requirements of the national standard, and the embedded steel belt should have good tensile strength and corrosion resistance. It is strictly forbidden to use recycled materials for processing to ensure the service life and safety of the pipeline.

The connection method needs to be suitable for municipal construction scenarios. Conventional hot melt docking or clamp type connection is optional. The former is suitable for long-distance straight pipe section construction and has strong sealing performance. The latter is convenient for bending and emergency repair operations. When inviting tenders, the optional range can be clearly specified or marked according to the project requirements.

In addition, the performance indicators must also include anti-settlement performance, chemical corrosion resistance, and meet the requirements of the municipal complex underground environment; at the same time, the inspection requirements must be clear, and the bidder must provide the ring stiffness, tensile strength and other index test reports issued by the third-party authority, and the parameters must comply with the relevant national standards.

These parameters not only fit the actual needs of municipal projects, but also comply with industry norms, which can provide a clear reference for both inviting tenders and avoid construction risks and quality problems caused by vague parameters.