新容规节选（Excerpt from the new book）.docVIP

新容规节选（Excerpt from the new book） 2.5 ultrasonic examination of steel plate 2.5.1 test requirements The thickness is greater than or equal to 12mm of carbon steel and low alloy steel plates (not including laminated multilayer vessel) used in the manufacture of pressure vessel, who meet one of the following conditions should be one by one ultrasonic testing: (1) the toxicity of the medium is extremely high and highly dangerous; (2) used in wet H2S corrosion environments; (3) design pressure greater than or equal to 10MPa; (4) the standards quoted in this specification require one by one to carry out ultrasonic testing. 2.5.2 test qualification standard Ultrasonic examination of steel plate shall be made according to the provisions of JB/T 4730 - 2005 nondestructive testing of pressure equipment. The steel plate meets the requirements of 2.5.1 (1) to (3) of this procedure, and the qualification level shall be no less than level II; the steel plate according to item 2.5.1 (4) of this procedure shall be in conformity with the standards specified in this procedure. 3.16 nondestructive testing requirements The pressure vessel design unit shall, in accordance with these procedures, the standards cited in this procedure and the requirements of JB/T 4730, specify the nondestructive testing methods, proportions, quality requirements and conformity levels of the selected designs in the design drawings. 3.18 check hole (1) the pressure vessel shall be provided with manholes, hand holes and other inspection holes according to the requirements, and the opening position, quantity and size of the inspection holes shall meet the need for internal inspection; (2) of the pressure vessel or not it is unnecessary to open the inspection hole, the designer should put forward concrete measures, such as increasing the manufacturing test items or proportion, and the focus of inspection items, inspection equipment for the use of regular method request. 3.21 insulation that is not allowed to be