For industrial-lined pipes (fluorinated lining, PP lining, etc.), should flanges or welding be used for connection? And if welding is used, how should it be done?
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For industrial-lined pipes (fluorinated lining, PP lining, etc.), should flanges or welding be used for connection? And if welding is used, how should it be done?
Organic materials have a low melting point of <400°C, while metals have a high melting point of >1500°C. Metal joints lined with fluorine, PP, etc., cannot be welded. We generally require that, after lining, it should not be exposed to high temperatures; moreover, their expansion coefficients are different, and repeated exposure to heat and cold can easily lead to delamination and bubbling.
Thank you. So it can only be connected by flanges, and it’s already prepared at the time of manufacture?
It is recommended not to use welding, as it can easily cause damage to the lining, thereby rendering it ineffective.
How is the lining made? Finish the pipes, send them to the manufacturer, wrap them up, and then send them back?
The internally coated pipes we produce are prefabricated in sections before coating, with the joints between sections connected using flanges.
Purchase directly, acquire steel pipes and lining materials to fabricate on-site, weld the flanges, and outsource the lining production
How to set up and connect the temperature and pressure measurement points on the lined pipeline?
I purchase tees here, which are connected using flanges