Freeware volume calculator for irregularly shaped pool
in [Freeware]
|
From: Smitty Two on 18 Jul 2010 14:00 In article <i1v7t22q2du002malch(a)news.sonic.net>, malch(a)malch.com (Malcolm Hoar) wrote: > We designed an elaborate > bottle, clicked the button and we had the volume. any 3D cad program will do that these days.
From: Donna Ohl on 18 Jul 2010 14:25 On Sun, 18 Jul 2010 10:58:49 -0700, Smitty Two wrote: > Donna is a troll, krw. She pops in every six months or so. Hi Smitty, May I ask why you assume that anyone who respond politely, provides data, asks questions and follows up on them, snaps pictures, posts them to prove the point, provides all necessary detail, and gives reasonable responses .... is a troll? This always amazes me! I put in an entire water heater, documented every single step, took fifty pictures and posted them, took everyone's advice, and yet, I get called a troll. Why do you think responding politely, providing details, and writing up a summary in the end makes me a troll. I had to change my alias because of that, and, I am just as polite in my other alias, yet there I don't get called a troll. I post at least once a day and only on this alias do I get called a troll. It never ceases to amaze me. (BTW, none of my aliases are my real name or identity; neither is yours.) It hurts that being a good nntp net citizen is so disturbing to others that they can't believe anyone can follow the rules and be polite, responsive, provide details, and summarize (yes, so others can benefit from the results). I'm sorry Smitty Two, but, I am not a troll. I am merely a human being who wishes to find the answer to my questions. I have higher level degrees; and I speak and write properly; I respond to people; I ask questions; I summarize answers; I make phone calls; I download and post manuals; I snap pictures; and I make mistakes. I do tend to run on and I do lean heavily toward details, but if you think anyone who does so is a troll, then I believe you need to re-examine what the etiquette and proper procedure is for USENET nntp posts. I follow the correct rules and for some reason, you think that makes me a troll. May I ask that you search for any of my posts to show why or how it's a troll (well, skip the ones that either bearbottoms or hummingbird or franklin posed as mine ... clearly you can tell from the grammar and sentence structure that those are not mine). None of my other aliases get called a troll; yet this one does. I'm just as polite in every one. Just as detailed. Just as well intentioned. Please edify me, Smitty, as I'll have to just pop up as another alias just to get a question answered properly and to edify the recipients of the summary we all find out together. Sincerely yours, the person behind the alias "Donna Ohl"
From: Donna Ohl on 18 Jul 2010 16:21 On Sun, 18 Jul 2010 20:38:20 -0500, DanG wrote: > 2" Schedule 40 pipe holds .1743 gallons/LF. Hi Dan, All pipe above ground seems to be schedule 40 white plastic painted black. I did the math as I was writing the post (as I am prone to do) so I'll double check the figures and post back. I agree, I used a radius of 1.5 because I first assumed the sphere was 3 feet but then went outside to measure it at two feet and forgot to update that number. :() The figure of 2 gallons per foot inside the two-inch pipe came from krw(a)att.bizzzzzzz (7/18/2010, 8:48:42 am). I didn't question his math but using your figure of 2/10ths of a gallon per linear foot will tremendously change the numbers! Let me first doublecheck how much fluid is in a linear foot of 2-inch OD pool plumbing pipe!
From: krw on 18 Jul 2010 16:22 On Sun, 18 Jul 2010 20:38:20 -0500, "DanG" <dgriff23(a)7cox.net> wrote: >Donna, I sure am not taking sides or even understand what is going >on. I did read your info that just didn't sound right to me, so I >did a bit of checking. > >2" Schedule 40 pipe holds .1743 gallons/LF. This is steel pipe, I >suspect yours is plastic, but won't vary much. My source: >http://www.saginawpipe.com/steel_pipe.htm > >Your figure of 300LF of 2" pipe would hold a hair over 52 gallons, >not your reported 600. Plastic and copper pipe hold less water >per foot. > > >The equation for volume of sphere is > > V= 4/3 Pi r*3 That would be 4/3 Pi* R^3 (cubed, not times three) It's not a sphere, it's a cylinder (which I could have blown completely). V= Pi * r^2 * l > so for your 2' sphere with a radius of 1' Where did the 2' sphere come from?' > V= 1.333 x 3.14 x 1 > V= 4.1888 cf V = (3.14 * 1"^2 * 12")/12^3 (which is where my mistake is - I used 12^2) = .0218 cu. ft. * 8 = .175 gal Your number, above, is right even if your calculation is all wet. ;-) >there are about 8 gallons (actually 7.48) in a cubic foot, so >about 32 gallons in >the ball, less for the filter junk. > >It sounds to me as if you might need to double check some of your >data.
From: Donna Ohl on 18 Jul 2010 16:42
On Sun, 18 Jul 2010 10:48:43 -0500, krw(a)att.bizzzzzzzzzzzz wrote: > A 2" pipe holds about 2 gallons per foot. Trying to verify that as it's one of the most important figures in calculating the residual liquid in pool plumbing systems. Let's calculate the volume of a one foot length of plastic schedule 40 white (painted black) pool pipe. The formula for the volume of a pipe is pi times radius squared, times the length. Pi = 3.14 Length is 1 foot The ID of a 2" OD PVC schedule 40 pipe is apparently 2.067" so let's call that 2.1" which makes the ID half that which (to one significant figure) is 1.0 inches. http://www.snapfour.com/pdf/Table_38-39.pdf The volume of a one-foot length of pipe is: 3.14 x 1.0^2 inches x 12 inches = 38 cubic inches = 0.02 cubic feet If we assume 7.5 gallons of water is one cubic foot, that's about 0.2 gallons per linear foot of pipe, not two gallons! My mistake. I'll re do all the match in a prior post to correct by 1/10th! |