Final answer:
The flattening of a bend and its maximum and minimum diameters in relation to internal pressure in Engineering. minimum diameters at any cross section of the bend should not exceed a certain percentage of the nominal outside diameter. This requirement ensures that the bend can withstand the internal pressure.
Step-by-step explanation:
The subject of this question is Engineering. The question is related to the flattening of a bend in a structure under internal pressure. Flattening refers to the deformation or change in shape of the bend, which can occur due to the applied pressure.
The requirement mentioned in the question states that the difference between the maximum and minimum diameters at any cross section of the bend should not exceed a certain percentage of the nominal outside diameter. This requirement ensures that the bend can withstand the internal pressure without excessive deformation or failure.