Flow velocity
Flow velocity
(OP)
I'm asking about the eligibles values of the velocity in water pipeline (drinking water) (discharge pipes and aspiration pipes). I need references of these information.
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RE: Flow velocity
Example:
http://www.engineeringtoolbox.com/flow-velocity-wa...
Google: "flow-velocity-water-pipes"
Sometimes its possible to do all the right things and still get bad results
RE: Flow velocity
RE: Flow velocity
Remember that velocity rules of thumb for line sizing are all based on an economic optimization between two competing factors: pumping energy and the cost of purchasing and installing pipe. If the water is clean rather than being an aqueous slurry or sulphuric acid, erosion is seldom a consideration unless you're designing infrastructure with a 50+ yr design life.
RE: Flow velocity
For potable water sytems it is actually a major concern, especially in copper pipe. That is why cold water is kept to a velocity of 5-8 fps while hot water is kept to 4-5 fps. A well designed plumbing system will easily last more than 50 years.
RE: Flow velocity
Can you provide a bit more guidance on what you're trying to do.
As you've probably discovered, there are no fixed velocity limits in any document , AFAIK, which can be referenced for clean potable water, only guidelines in various documents / websites / forums.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Flow velocity
i'm not asking about turbulence , thx
littleInch,
i want to evaluate the velocity of the flow in pump station, so i ask if there is limits for the velocity (to not damage the pipes for example ...), i hope you get my point
thx for all replies
RE: Flow velocity
Practical / good practice is somewhere between 1.3 to 3 m/sec, but in particular locations could be higher or lower. As MM says, the issue is a balance between pressure drop and cost of the pipe.
Velocity inside piping / pump stations is usually a lot higher than in a long pipeline due to much smaller lengths.
Rather vague question so rather vague answer.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Flow velocity
RE: Flow velocity
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Flow velocity
Reasonable pipe velocities depend on the application. There is no correct velocity for all applications. Here is a general guideline.
Reasonable Velocities for the Flow of Water through Pipe (from Cranes Technical Paper 410):
Boiler Feed.............8 to 15 ft/sec
Pump Suction ............4 to 7 ft/sec
General Service.........4 to 10 ft/sec
City.......................to 7 ft/sec
Transmission Pipelines...3 to 5 ft/sec
Go to a basic hydraulics book. Try Cranes Technical Paper 410 as a reference for the above velocities.
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