How should this phrase \"Containers with a nominal thickness of 50 mm or more\" be understood?
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1. All weld joints of vessels with a nominal shell thickness of 50 mm or more after final heat treatment； 2. For containers with a nominal thickness of 50 mm or more, after the hydrostatic test, their Class A and Class B weld joints shall also undergo 100% ultrasonic testing, to be considered acceptable at Grade I. The tank section of the equipment has a wall thickness of 60 mm, while the wall thickness of all other sections of the equipment is less than 50 mm. I would like to ask whether, in the above two standards, the term \"container with a nominal thickness of 50 mm or more\" refers to the welded joints of the entire equipment, or only to that one tank section 【Equipment medium: hydrocarbons (91.5% benzene); medium properties: explosive medium, extremely hazardous; operating pressure: 0.4 MPa】
This is how I understand it: it refers to the weld joints. If there is only one section with a thickness greater than 50 mm, and the weld joints on either side have a thickness of less than 50 mm after trimming, then that requirement does not need to be met; however, ring welds or longitudinal welds within the structure itself that have a thickness greater than 50 mm still need to comply with this requirement.
Where did the poster get the requirement for these two sentences?
May I ask where the requirements for these two sentences from the original poster come from?
Sinopec Luoyang Engineering Co., Ltd. 70BJ021-2018, Sections 7.9.d and 7.11
The thickness shown on the design drawings is generally the nominal thickness
I think it means that the part equal to or greater than a certain value needs to meet the requirements, while the part less than 50 does not need to
Thank you all for your replies; it was later decided to focus only on the section on the water-in-tube shell that is larger than 50 mm.