【Daily Question: Pump Equipment】True or False Question, 2018.12.26

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This post was last edited by 3983596_FPPZ on 2018-12-26 08:21. Rules for the true/false questions: 1. Those who get both questions wrong receive a reward of 2 Wealth points as an incentive for their active participation; 2. Those who get one question right and one wrong receive a reward of 4 Wealth points; 3. Those who get both questions right receive a reward of 6 Wealth points ； 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. Again, an award for academic achievement – come by here every day! 1. API610 requires that there 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. ( ) 2. The only purpose of quenching and tempering carbon steel shafts is to increase their surface hardness. ( ) Answer: Incorrect, incorrect. 1. API610 specifies a difference of HB50 ； 2. Hardness is merely one goal of shaft quenching and tempering; improving overall mechanical properties is its primary function