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1前言按照GB150—89《钢制压力容器》标准要求．凡属压力容器设备上的法兰．首先选材应符合压力容器材料标准，并对选用的材料经超声波无损探伤．以无分层等缺陷为合格。而对于大型由焊接拼成的法兰．焊后必须对焊缝进行百分之百的射线或超声波探伤检查，验收标准按相应的法兰?
1 Introduction According to GB150-89 “steel pressure vessel” standard requirements. Any pressure vessel equipment on the flange. The first selection of materials should be consistent with pressure vessel materials standards, and the selection of materials by ultrasonic nondestructive testing. No delamination and other defects as qualified. For the large flange made of welded together. Welding must be carried out on the weld one hundred percent ray or ultrasonic inspection, the acceptance criteria according to the corresponding flange?