What type of flange does the 159*6 pipe fit with?
From the specifications, should be equipped with DN150, as for other, but also need the appropriate conditions.
4.5MM wall thickness +150 internal diameter, so with 150 flanges
Can only tell you is DN150 pressure is how much, you did not say, use the industry also did not say. Do you use continental flanges or American flanges?. So I'm not sure what the exact model is