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One of the primary determinants of the friction factor is the roughness of the inner surface of the pipe. Galvanized iron pipes often exhibit a relatively high level of roughness compared to other materials, such as PVC or copper. This rough surface can lead to increased turbulence in the fluid flow, resulting in a higher friction factor. Suppliers need to pay close attention to the manufacturing processes that can influence the surface finish of their pipes. Techniques such as improved galvanization methods or surface treatments could significantly reduce the internal roughness and thereby lower the friction factor.
friction factor of galvanized iron pipe suppliers

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Another option for sealing large gaps in doors is felt weather stripping. Felt weather stripping is made of a durable felt material that provides a good seal against drafts and can be easily installed with adhesive backing. Felt weather stripping is a cost-effective option for sealing large gaps and is available in a variety of colors to match your door

door weather stripping for large gaps.

door weather stripping for large gaps.