Regarding the jacket tube issue
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For the polyester jacketed tube, the inner tube operates at high pressure of 10 MPa, while the outer tube operates at low pressure of 0.8 MPa. Since it’s not possible to avoid it on-site, a flange needs to be added (although flanges are generally not used). How should this jacket flange be selected? For the HG/T20592 American standard series, upper jacket flanges are available only in PN20 and PN50 grades. Can’t it be used with such high pressure in the inner tube? Or should I choose a 10MPa flange with a pipe cap jacket?
The flange is selected based on the internal pipe pressure, and the external sleeve can be of the cap type or end plate type. The specific construction of the jacket can be carried out in accordance with SH3040.