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| Difference in Flow rate if diameter of transmission Line reduces from 900mm to 300mm? | |||
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| Posted by: wired99 ® 11/23/2009, 13:36:21 Author Profile eMail author Edit |
Kindly update me about the below: Our city gets water by means of a 900mm transmission line from a pumping station say A about 25 kms far.But the line reduces from 900mm to 300 when it enters our sity till our reservoir (B). The discharge flow rate at station A is 2MGD but our reservoir inlet flowmeter only shows 1.6MGD. What could be the reason?The pipeline is solely for our city and no other community is connected to it. |
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| : Difference in Flow rate if diameter of transmission Line reduces from 900mm to 300mm? | |||
| : Difference in Flow rate if diameter of transmission Line reduces from 900mm to 300mm? -- wired99 | Post Reply | Top of thread | Engineering Forum |
| Posted by: Marky ® 11/23/2009, 14:33:44 Author Profile eMail author Edit |
Hi and welcome to the forum....You have a restriction RESTRICTION vs PERFORMANCE
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| : : Difference in Flow rate if diameter of transmission Line reduces from 900mm to 300mm? | |||
| : : Difference in Flow rate if diameter of transmission Line reduces from 900mm to 300mm? -- Marky | Post Reply | Top of thread | Engineering Forum |
| Posted by: jboggs ® 11/23/2009, 15:50:28 Author Profile eMail author Edit |
Something doesn't make sense here. He says his flow rate at one point is 2MGD. I don't know what "MGD" means but he says it is a flow rate. To me, that's like gallons per minute. Not velocity or pressure. The flow rate will be the same at all points in a closed system unless there is a leak. Right? The flow has to go somewhere. The pressure and the velocity will vary, but not the flow rate. If you have 20 GPM upstream and something less than that downstream, you have a leak somewhere. Right? It would help if I knew what "MGD" means. Million gallons per day, maybe? |
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| : : : Difference in Flow rate if diameter of transmission Line reduces from 900mm to 300mm? | |||
| : : : Difference in Flow rate if diameter of transmission Line reduces from 900mm to 300mm? -- jboggs | Post Reply | Top of thread | Engineering Forum |
| Posted by: wired99 ® 11/23/2009, 22:18:31 Author Profile eMail author Edit |
Srry for the confusion Its million gallons per day
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| : : : Difference in Flow rate if diameter of transmission Line reduces from 900mm to 300mm? | |||
| : : : Difference in Flow rate if diameter of transmission Line reduces from 900mm to 300mm? -- jboggs | Post Reply | Top of thread | Engineering Forum |
| Posted by: Marky ® 11/23/2009, 16:06:09 Author Profile eMail author Edit |
J....I assumed 2 Million Gallons Per Day....or Miller Genuine Draft. Modified by Marky at Mon, Nov 23, 2009, 16:08:11 |
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| : : : : Difference in Flow rate if diameter of transmission Line reduces from 900mm to 300mm? | |||
| : : : : Difference in Flow rate if diameter of transmission Line reduces from 900mm to 300mm? -- Marky | Post Reply | Top of thread | Engineering Forum |
| Posted by: mochocer ® 11/24/2009, 02:44:21 Author Profile eMail author Edit |
Actually , "the flow rate will be the same at all points in a closed system unless there is a leak" this is right as long as friction losses are omitted.It's mean when fluid flows in a pipe line, the pressure decreases because of pipes and fitttings friction (these are on pipe line). The preasure losses are very important for plumping. There are some calculating methods and tables to calculate the true pipe diameter.
Modified by mochocer at Tue, Nov 24, 2009, 03:21:38 |
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| : : : : : Difference in Flow rate if diameter of transmission Line reduces from 900mm to 300mm? | |||
| : : : : : Difference in Flow rate if diameter of transmission Line reduces from 900mm to 300mm? -- mochocer | Post Reply | Top of thread | Engineering Forum |
| Posted by: jboggs ® 11/24/2009, 08:48:41 Author Profile eMail author Edit |
Yes, the pressure will decrease as it overcomes friction in the system. But if there are no leaks, the flow rate (gallons per minute or million gallons per day) cannot decrease. The flow must go somewhere. The only way the flow rate can decrease is if there are leaks. I would also suggest that you check on the reliability and accuracy of your meters. Make sure you have the right information. |
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| : : : : : Difference in Flow rate if diameter of transmission Line reduces from 900mm to 300mm? | |||
| : : : : : Difference in Flow rate if diameter of transmission Line reduces from 900mm to 300mm? -- mochocer | Post Reply | Top of thread | Engineering Forum |
| Posted by: Marky ® 11/24/2009, 07:27:33 Author Profile eMail author Edit |
So it looks more like what you and Jboggs are hinting towards a leak in his system...of almost a 1/2 million gallons per day. Yikes!!!
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