化工装备演习题(国外英文资料).docVIP

化工设备练习题(国外英文资料) Mechanical fundamentals of chemical equipment A, true or false 1, in all heads, the pressure capacity of the head of the plate is the worst, and the bearing capacity of the ball head is the best. (a) The modulus of elasticity and the ratio of the moorings are the mechanical properties of the material, neither of which varies with the temperature. (a) 3, internal pressure cylinder is inversely proportional to the stress and the wall thickness of thin film, when the container material and internal pressure of the medium is constant, the thickness of internal stress of vessel wall is always less than the wall thickness of small containers. (a) According to the theory of elastic failure, the vessel is invalidated when the maximum stress of a certain part of the container wall reaches the limit of yield under the material design temperature. (a) 5, the safety factor is a data that continuously develops and changes, as science and technology develops, its value will gradually decrease. (a) From the point of view of pressure, the semi-spherical seal head is the ideal, and it is the most important to use, which should be given priority when choosing the sealing head. (a) According to the stress of the non-moment theory, the stress of the film is called the membrane stress, and the membrane stress is distributed evenly along the wall. (a) The material of the metal gasket is generally not demanding, but it is flexible. (a) When a seamless tube is used as a container, its nominal diameter is the outer diameter. () If there is only a concentrated force on the beam, the inner force of the cross section has no shear force. (a) The nominal diameter of the cylinder and forming head of the steel plate is the diameter of the cylinder. (a) To open elliptical holes in cylindrical vessels that are under pressure, the long axis of the oval hole should be parallel to the cylinder axis. (a) In the flange seal, the strength and stiffness of the flanges are equally important