[Daily Question: Pump Equipment] Weekly Summary 2018.12.30
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This post was last edited by 3983596_FPPZ on 2018-12-31 08:56. Monday (2018.12.24): https://bbs.hcbbs.com/thread-2226803-1-1.html 1. The vaporization pressure of a liquid is an absolute pressure value. (Yes) 2. The pump inlet vacuum is the absolute pressure difference. (Two) Tuesday (2018.12.25) https://bbs.hcbbs.com/thread-2228200-1-1.html 1. For media that are prone to crystallization or polymerization, a filter screen should be installed at the pump inlet (Wrong). 2. From the perspective of ease of maintenance, a check valve should be located upstream of the pump outlet valve (Correct). Wednesday (2018.12.26) https://bbs.hcbbs.com/thread-2229368-1-1.html 1. API610 stipulates that there should be a hardness difference of at least HB100 between the impeller seal ring and the pump body seal ring, in order to prevent them from biting into each other due to similar hardness levels. (Incorrect) 2. The only purpose of quenching and tempering carbon steel shafts is to increase their surface hardness. (Wrong) Thursday (2018.12.27) https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=2230739 1. Is the pump efficiency the ratio of useful power to shaft power? (Yes) 2. The value of the cavitation specific speed is independent of the outlet parameters of the pump; the higher this value, the better the pump’s resistance to cavitation. (Fast) Friday (2018.12.28) https://bbs.hcbbs.com/thread-2232802-1-1.html 1. If the flow condition of the medium in the pipeline is stable, the pressure gauge can be connected to a straight pipe section of any diameter near the pump outlet to measure the actual outlet pressure of the pump. (Wrong) 2. The pressure gauge can function properly as long as the actual operating pressure is below its range. (Wrong) Saturday (2018.12.29) https://bbs.hcbbs.com/thread-2235019-1-1.html 1. Cavitation is a common phenomenon in any equipment used for transporting liquids, including both static and dynamic equipment. (Correct) 2. Common torque wrenches control the upper limit value of the tightening torque (Incorrect)
:Lol, thanks for your effort. I’ll take care of it tomorrow; it’s a good time to do a comprehensive review at the end of the year.
This post was last edited by 3983596_FPPZ on 2018-12-30 at 10:44. Let’s see how many days it will be left; since not much is left and the weather is cold, I just played around by myself in the dormitory
Let’s also prepare two side dishes; sing while drinking wine. Life is short, after all. I’ve indeed come across many posts on Haichuan – it’s good to take some time to go through them and learn something from them
“The only purpose of quenching and tempering carbon steel shafts is to increase their surface hardness – is the answer correct? ~~~~
It was wrong; I made a mistake while organizing it. Thank you for the reminder; I’ve made the correction
The idea of preparing two small dishes means cooking by oneself, as the cafeteria chefs are on vacation