I need help: can butt-weld flanges be used for PE pipe flanges?
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Seeking expert advice: For pressure pipelines in GC1, carbon-lined PE pipes are to be used. How should the flanges be selected? Is it acceptable to use PN25 butt-welded flanges as required? Since lining requires soft gaskets, and standards dictate the use of male and female flanges, how can this requirement be met?
The standards for lined pipes recommend the use of PL flanges, but it seems that PL flanges are not suitable for highly toxic fluids such as GC1
Lined pipes are basically prefabricated in the factory; it’s not possible to weld them on-site
For a pressure of PN25, with a butt-welded joint type and flanges featuring male and female sealing surfaces, manufacturers can indeed produce such flanges; the price is only slightly higher than that of conventional socket RF flanges. Before lining a GC1 pipeline with PE, it is also necessary to consider the non-destructive testing of the butt welds
Yes, an adjustment section will be reserved. Once this adjustment section is prepared on site, it will be sent back to the factory for further processing
First, consider whether the requirements are met, and then consider the cost issue
This post was last edited by “No matter how tired, I must persevere” on 2020-8-24 at 17:27. I think it’s acceptable. According to HG/T 20538-2017, the type of flange should preferably be a slip-on flange or a flat-face flange, with the sealing surface being of the RF type. In other words, it is recommended; of course, butt-welded flanges can also be used.
Of course, welded flanges are available. Who said it has a raised and recessed flange? Ordinary flanges rarely have uneven surfaces; what kind of uneven surface do you use for your lined pipe?