There is no standard on the flatness of the flange sealing surface

Generally this way, the flange surface should be perpendicular to the main axis of the nozzle or cylinder. Nozzle flange should ensure that the level or vertical flange surface, the deviation shall not exceed 1% of the diameter of the flange, and not more than 3m

I also understand this, but the supervision does not understand this. Saying that the plane of the blue plane can not press this