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#1




Pipe diameter volume
area= 3.14 x radius x radius. so the 6 inch pipe has cross section
of 100 sq inches and the two 4 inch pipe have 25 sq inches On Mon, 04 Jul 2005 06:21:31 0500, wrote: I want to put a drain pipe under a sidewalk for rain drainage. I am trying to determine the volume of a 6 inch pipe and a 4 inch. I know that one 4 inch wont be enough, but am wondering if TWO 4 inchers carry as much or more water than a 6 inch pipe. I have never been any good at mathematics. I think I have to multiply 4 or 6 by 3.14, but I am not sure. I will either use a 6 inch or two 4 inchers, which ever holds more water. Or I may even go to an 8 incher. Alot of water runs down the hill and keeps putting mud over the sidewalk. I need lots of drainage volume. Can anyone help. 
#2




bill wrote:
area= 3.14 x radius x radius. so the 6 inch pipe has cross section of 100 sq inches... We learn something new every day here... Nick 
#4




wrote in message Can anyone help. Pi r2 That does not show up properly but it is Pi (3.1416) x the radius squared. 
#6




wrote in message
... I want to put a drain pipe under a sidewalk for rain drainage. I am trying to determine the volume of a 6 inch pipe and a 4 inch. I know that one 4 inch wont be enough, but am wondering if TWO 4 inchers carry as much or more water than a 6 inch pipe. I have never been any good at mathematics. I think I have to multiply 4 or 6 by 3.14, but I am not sure. I will either use a 6 inch or two 4 inchers, which ever holds more water. Or I may even go to an 8 incher. Alot of water runs down the hill and keeps putting mud over the sidewalk. I need lots of drainage volume. Can anyone help. Assume similar pipe types such as tile or concrete and a slope that is the same for both the 4inch and the 6inch pipes. The maximum (pipe full) flow for the 6inch pipe will be about 15 percent greater than for the pair of 4inch pipes. I computed on the basis of Manning's Formula. I'll spare you the details but you can Google it if you're curious. Been a long time since I did a lot of that as a young engineer so I checked a nomogram in one of my old handbooks and got verification. Interesting exercise but I had to scrape through a lot of mental rust. SJF 
#7




On Mon, 04 Jul 2005 19:01:32 GMT, in alt.home.repair Pipe
diameter volume "George E. Cawthon" wrote: Actually it is the 4" pipe is 2x2x3.14= 12.6 and 6" pipe is 3x3x3.14= 28.3 The answer is that a single 6" pipe has a larger area than two 4" pipes. And the 6" pipe will be less likely to clog than the two 4" pipes.  To reply to me directly, remove the CLUTTER from my email address. 
#8




Yes the single 6" pipe has slightly more area than two 4" pipes
but................ how much water shed area (roof and / or ground) are you draining with this pipe? I drain ~800 ft^2 of roof & another 800ft^2 of yard with a single 4" line. The line drops about 20" over ~130 ft. This setup handles almost all the various levels of rainfall I get in SoCal. This year we had nearly 36" of total rainfall with some REALLY heavy , in the 2" per hour range. With the soil at or close to saturation, all this needed to be drained. I did experience some flooding (temporary pooling) due to poor local soil slope but the water would generally drain off in a few minutes (10 min) after the downpour let up. How water your pipe(s) can handle is a function of the size, type & drop of the pipe. IMO for most common residential applications a single 4" line should work............but it depends on how much water your need to drain & how quickly. cheers Bob IMO simplest circular section area formula...............area = D * D *.7854 ..7854 = Pi/4 because we tend to measure & think about diameters 
#9




"SJF" wrote in message news:xljye.3475$HV1.1917@fed1read07... wrote in message ... I want to put a drain pipe under a sidewalk for rain drainage. I am trying to determine the volume of a 6 inch pipe and a 4 inch. I know that one 4 inch wont be enough, but am wondering if TWO 4 inchers carry as much or more water than a 6 inch pipe. I have never been any good at mathematics. I think I have to multiply 4 or 6 by 3.14, but I am not sure. I will either use a 6 inch or two 4 inchers, which ever holds more water. Or I may even go to an 8 incher. Alot of water runs down the hill and keeps putting mud over the sidewalk. I need lots of drainage volume. Can anyone help. Assume similar pipe types such as tile or concrete and a slope that is the same for both the 4inch and the 6inch pipes. The maximum (pipe full) flow for the 6inch pipe will be about 15 percent greater than for the pair of 4inch pipes. I computed on the basis of Manning's Formula. I'll spare you the details but you can Google it if you're curious. Been a long time since I did a lot of that as a young engineer so I checked a nomogram in one of my old handbooks and got verification. Interesting exercise but I had to scrape through a lot of mental rust. SJF Quick calculation pi/4 washes out: Area of a 6" pipe6^2=36. Area of two 4" pipes is 2*4^2=32. 36/32=1.125so 6' pipe has about 12.5% more flow area than two 4' pipes. Just agreeing with your numbersmental exercise for me too g MLD 
#10




And, now it falls to me to give you pi in the face.
===================== Has anyone had time to calculate pi beyond the first 4 BILLION places? They did it with the aid of a computer in the eighties, but after that, I don't know. Because everybody needs an accurate pi: 3.141592653589793238462643383279502884197169399375 10582097494459230781640628 620899862803482534211706 79821480865132823066470938446095505822317253594081 28481117450284102701938521 105559644622948954930381 96442881097566593344612847564823378678316527120190 91456485669234603486104543 266482133936072602491412 73724587006606315588174881520920962829254091715364 36789259036001133053054882 046652138414695194151160 94330572703657595919530921861173819326117931051185 48074462379962749567351885 752724891227938183011949 12983367336244065664308602139494639522473719070217 98609437027705392171762931 767523846748184676694051 32000568127145263560827785771342757789609173637178 72146844090122495343014654 958537105079227968925892 35420199561121290219608640344181598136297747713099 60518707211349999998372978 049951059731732816096318 59502445945534690830264252230825334468503526193118 81710100031378387528865875 332083814206171776691473 03598253490428755468731159562863882353787593751 95778185778053217122680661300192787661119590921642 01989380952572010654858632 788659361533818279682303 01952035301852968995773622599413891249721775283479 13151557485724245415069595 082953311686172785588907 50983817546374649393192550604009277016711390098488 24012858361603563707660104 710181942955596198946767 83744944825537977472684710404753464620804668425906 94912933136770289891521047 521620569660240580381501 93511253382430035587640247496473263914199272604269 92279678235478163600934172 164121992458631503028618 29745557067498385054945885869269956909272107975093 02955321165344987202755960 236480665499119881834797 75356636980742654252786255181841757467289097777279 38000816470600161452491921 732172147723501414419735 68548161361157352552133475741849468438523323907394 14333454776241686251898356 948556209921922218427255 02542568876717904946016534668049886272327917860857 84383827967976681454100953 883786360950680064225125 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057007334924369311383504 93163128404251219256517980694113528013147013047816 43788518529092854520116583 934196562134914341595625 86586557055269049652098580338507224264829397285847 83163057777560688876446248 24685792603953 5277348030480290058760758251 For those morbidly curious, assuming this number is correct, that's pi to 6000 decimal places. Note that pi to 50 places allows you to calculate the circumference of the universe (assuming you have accurate measurements) in electron diameters, with several decimal place accuracy. ====================  Christopher A. Young Learn more about Jesus www.lds.org www.mormons.com wrote in message ... bill wrote: area= 3.14 x radius x radius. so the 6 inch pipe has cross section of 100 sq inches... We learn something new every day here... Nick 
#11




The inside diameter of a pipe should not exceed the outside diameter,
otherwise the hole will be on the outside of the pipe. Seriously though, another way of figuring the area of a circle is that it will be about 78.5% of that of a square the same size as the circle's diameter,regardless of whether it is an inch or a mile. Larry 
#12
Posted to alt.home.repair




Pipe diameter volume
replying to MLD, Rick Rayfield wrote:
lot Quick calculation pi/4 washes out: Area of a 6" pipe6^26. Area of two 4" pipes is 2*4^22. 36/32=1.125so 6' pipe has about 12.5% more flow area than two 4' pipes. Just agreeing with your numbersmental exercise for me too g MLD Most of the answers address the problem presented. But the question asked was about the "volume"of the four and six inch diameter pipes. Roughly, with a cross section of 12 square inches, a foot of four inch diameter pipe has 144 cubic inches, or 1/12 cubic foot.The six pipe has a rough cross section of about 27 square inches, or about 1/5 cubic foot per foot of pipe. Or simply, the six inch pipe for the same length has a volume of a bit more than twice the volume of the four inch pipe. Last time I looked, four inch pipe is a lot less than half the price of six inch pipe. So if cost or distributing the flow are factors, the smaller pipe(s) may be the better answer.  posted from http://www.homeownershub.com/mainten...ume65969.htm 
#13
Posted to alt.home.repair




Pipe diameter volume
On 05/18/2016 3:44 PM, Rick Rayfield wrote:
replying to MLD, Rick Rayfield wrote: lot Quick calculation pi/4 washes out: Area of a 6" pipe6^26. Area of two 4" pipes is 2*4^22. 36/32=1.125so 6' pipe has about 12.5% more flow area than two 4" pipes.... .... Most of the answers address the problem presented. But the question asked was about the "volume"of the four and six inch diameter pipes. Roughly, with a cross section of 12 square inches, a foot of four inch diameter pipe has 144 cubic inches,...[rest elided for brevity] But the volume is simply Area * Length so the length also cancels out if ratio so the volume ratio is identically the crosssectional area. Precise numbers are easily available from pipe tables online... http://www.engineeringtoolbox.com/ansisteelpipesd_305.html  
#14
Posted to alt.home.repair




Pipe diameter volume
On Wednesday, May 18, 2016 at 5:28:33 PM UTC4, dpb wrote:
On 05/18/2016 3:44 PM, Rick Rayfield wrote: replying to MLD, Rick Rayfield wrote: lot Quick calculation pi/4 washes out: Area of a 6" pipe6^26. Area of two 4" pipes is 2*4^22. 36/32=1.125so 6' pipe has about 12.5% more flow area than two 4" pipes.... ... Most of the answers address the problem presented. But the question asked was about the "volume"of the four and six inch diameter pipes. Roughly, with a cross section of 12 square inches, a foot of four inch diameter pipe has 144 cubic inches,...[rest elided for brevity] But the volume is simply Area * Length so the length also cancels out if ratio so the volume ratio is identically the crosssectional area. Plus the math test ended 10 years ago. 
#15
Posted to alt.home.repair




Pipe diameter volume
On 05/18/2016 5:18 PM, trader_4 wrote:
.... Plus the math test ended 10 years ago. Sure (albeit I didn't look figured probably was old given it showed up w/o a initial subject), but the illadvised comment wasn't.  
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