The gasket face of the flange should squarely contact the face of the mating flange 法兰垫圈面应该与配套法兰面均匀接触。
Even then , seating and gasket faces or buttweld ends can show fine - line cracks that need more upgrading by rewelding and remachining 即使在这种情况下,阀座和垫圈面或碰焊端可能会显示需要通过重焊和机加工的细线裂缝。