【Daily Question: Pump Equipment】True or False Question, December 20, 2018

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This post was last edited by 3983596_FPPZ on 2018-12-20 09:15. Rules for the bg4.png quiz: 1. Those who get both questions wrong receive a reward of 2 Wealth as an incentive for their active participation; those who get one question right and one wrong receive a reward of 4 Wealth; those who get both questions right receive a reward of 6 Wealth ； 2. Rewards for answers are available once per person only ； 3. Each reply allows for one management rating only ； 4. The answer and its explanation will be visible after responding ； 5. The reward is valid for 48 hours. Studying* and winning awards again; come by here every day. 1. The main difference in the chemical composition of 304 and 316L metals is that, at the same carbon content, their levels of other chemical elements such as Cr and Ni vary. ( ) 2. For large-diameter impellers used for export, it is necessary to cut them at an angle along their outer diameter; this is done so that the impeller can maintain axial force balance and good dynamic balance even after cutting. ( ) Answer: Wrong, Wrong. 1. The carbon content in 304 (equal to or less than 0.08%) is higher than that in 316L (equal to or less than 0.03%). 2. Keep the lengths of the flow channels (streamlines) in the front and rear cover plates of the impeller after cutting as equal as possible, in order to reduce the backflow and vortex losses caused by differences in flow velocity at those cover plates