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Sizing maindistribution line and transmisionline pipe 2
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a little more information would be useful
what country is your project in?
do you need to satisfy a fire marshal?
what about insurance companies?
your figure does not show a water source, what about that?
not sure why you have two lines on each street
line size must be based on hydraulics, you can't just pick a size. pressure requirements and topography have a large impact on the design
service lines are based on desired flow rates, again you can't just pick a size
for 1400 people, I am sure you will need some lines larger than 8 inch
Suggest you define your design criteria and thenset up a water network model to design this.
what country is your project in?
do you need to satisfy a fire marshal?
what about insurance companies?
your figure does not show a water source, what about that?
not sure why you have two lines on each street
line size must be based on hydraulics, you can't just pick a size. pressure requirements and topography have a large impact on the design
service lines are based on desired flow rates, again you can't just pick a size
for 1400 people, I am sure you will need some lines larger than 8 inch
Suggest you define your design criteria and thenset up a water network model to design this.
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- #8
im from the philippines.. i consider this design that have two pipes per street because it is one of the existing design here, but this is an old design with no consideration of fire flow. I thought i can use this also in insisting a fire hydrant.
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- #9
no reason to have two mains in each street, just doubles the length of pipe that needs to be maintained and reduces the amount of usable space in the right of way for other things like sewers, storm drain, gas line, telephone, electric, cable tv
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- #11
Where are you in the Philippines? You can probably get by with less than 8-inch water mains because your residences are of concrete construction.
You should check with the local fire brigade to determine the water needs for fire fighting.
You should check with the local fire brigade to determine the water needs for fire fighting.
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- #14
Residential construction here is mostly of wood construction and you would expect higher water flows are required by the insurance services who determine these water requirememts. Of course, this is offset somewhat because the residences are usually farther apart.
That is why you should check with the local fire brigade. The water mains are sized to transport the fire water, not for daily usage.
That is why you should check with the local fire brigade. The water mains are sized to transport the fire water, not for daily usage.
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sir bimr, sad to say that in our city there is no fire hydrant been installed i cant check that out.. thats why i cant use this old existing designs because i consider a firehydrant..Old designs, sizing of the pipe was based in daily usage considering peak demand.
trying to save money on watermains by going to a slightly smaller size could be foolhardy. The primary cost of your water system is to install and maintain the lines, not in procurement costs for the pipe. The incremental cost to upgrade from 6 inch to 8 inch pipe or 8 inch to 12 inch pipe is small. The corresponding increase in capacity is large. Or to put it another way, it is very expensive to dig up and replace a line later on because it is too small to deliver adequate flow or pressure.
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