Built Intuition
Region: US
Thursday 10 September 2026 02:00:31 GMT
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Tyson Krish :
A because the higher rpm’s of b creates cavitation due to the increased suction and viscosity of the fluid.
2026-09-24 03:59:38
1
Heath :
This is a stupid answer because it’s sort of an edge case as there are hidden parameters that aren’t given. I could just as easily assume that bottom of the tank is 20 ft above the pump and then cavitation is essentially a non-issue or I could assume the water is 210 degrees F and then both pumps are going to cavitate and not move optimal amounts of water.
2026-09-10 03:19:13
291
Bborda :
If all paramaters are even and fluid supply at suction is not restricted and the discharge is open flow then the higher revs will produce greater flow.
2026-09-24 10:56:18
0
D☆I☆C☆K☆Y :
non of them as they turning the wrong direction
2026-09-23 20:19:53
1
Merbitch :
still a good rule or thumb to have 1mtr higher NPSHR than NPSHA. however there is still not enough information here to give an accurate answer.
2026-09-24 08:31:08
0
user5991029379096 :
increase suction pipe size
2026-09-24 02:30:40
0
InfiniteVoid :
That’s why impeller trim, rpm, minimum head pressure calculations, and fluid density are important when determining the total mass flow rate of a pump in a system. Fluid dynamics are cool
2026-09-10 06:30:37
44
Keanen Naidoo :
Cavitation
2026-09-24 15:11:52
1
Doubleover :
Neither, them impellers spinning the wrong way
2026-09-11 00:10:44
1
Semiprospark433 :
Does this math work for satisfactory
2026-09-10 06:27:25
5
DinoCharlie :
There's nowhere near enough information. What fluid? Is it pressurized beyond atmosphere? What's the blade shape?
2026-09-10 12:14:48
25
Star_Industries :
the only acceptable answer is there's not enough information.
2026-09-10 15:47:39
13
spencer :
you're supposed to give the assumptions otherwise the answer is always gonna depend...
2026-09-14 19:43:12
0
tomfares909 :
Too much missing info.
2026-09-10 13:59:32
9
Starkasm05 :
Head pressure, pump curve and cavitation are the more widely known terms.
2026-09-15 21:01:32
2
MrHundo :
It’s cavatating. Will never regain its power unless it slows down
2026-09-16 15:55:14
1
Katman :
Too much turbulence sometimes slower and smoother. It’s just what the doctor ordered.
2026-09-10 21:20:42
0
rexerter :
How could you answer the question without all the information given? Based on the simple question of which one would move more water just based on speed it would be B.
2026-09-10 20:05:59
3
paul :
3000 rpm more water 4500rpm more pressure.
2026-09-13 02:35:46
1
Karma :
higher head pressure may have helped too
2026-09-10 15:41:09
2
timjennings987 :
In short. It’s cavitation
2026-09-10 15:44:56
2
mikenugentma :
Cavitation
2026-09-10 15:17:39
3
Ninja :
that makes logical sense. and couldn't the impeller design change to move the "liquid" differently
2026-09-10 02:30:23
0
Alfred frombatman :
Spacex wouldn't ask this question, they'd give more information about the pumps at the very least instead of just "which pump moves more water" especially since I've ran 12,000 rpm pumps that didn't cavitate unless the tank ran dry, there's so much more that goes into a pump than just too fast=problem
2026-09-10 10:26:14
2
Travelfortwo :
I don’t believe this is a space X question and answer and the answer is more complex than this simplification. Bottom line is that you never put two pumps on a common inlet.
2026-09-10 08:12:22
2
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