Let’s all answer question 39: Professional examination questions on mechanical equipment – True or False questions

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This post was last edited by zx9527007 on 2009-8-26 00:06. This event is organized to help all Haichuan members review their mechanical theory knowledge; we hope everyone will participate actively! The content of this issue was provided by member dyzdyz12345. 1. The base materials and welding materials used in welding projects should come with factory-issued quality certificates or quality reinspection reports. 2. Pressure vessels that have been out of use for more than 10 years due to production reasons require approval procedures for being taken out of service. 3. Cracks that occur in the weld after the welding process is completed, after a certain period of time, are generally referred to as delayed cracks. The cause of delayed crack formation is the high fluoride content in the high-temperature gases during welding. 4. After being manufactured or overhauled, pressure vessels must undergo pressure testing. The purpose of this testing is to assess the reliability of the sealing structure under conditions of elevated pressure, the integrity of the welds, and the overall strength of the vessel. 5. For the expansion relief of discharging incompressible liquids, a fully open safety valve is preferred; a slightly open safety valve should not be used. 6. Pressure vessels that require a deferred inspection due to production reasons must obtain approval from the relevant authority to have such a deferred inspection, and monitoring measures must be established. 7. The diaphragms of diaphragm couplings come in spoke-type and ring-type varieties. 8. When the pipe is bent, the greater the relative bending radius and relative wall thickness, the greater the deformation. 9. To scrap a pressure vessel, approval procedures must be followed and it must be registered with the supervision department. 10. Conduct a visual inspection of the safety valve, focusing on whether it is still within the warranty period, as well as checking for any leaks or rust. When replying, please choose hidden mode: hiding method. Note that editing is ineffective. Everyone is welcome to continue participating actively; if you have any questions or suggestions, please post them in the feedback thread. Starting from issue 17, those who answer all questions correctly can claim their prizes here. Those who answer all questions correctly will receive their prizes