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bill b
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Calculating the Volume of a "Pair of Pants"

12/04/2007 11:40 AM

Need to calculate the duct volume of a "pair of pants " for a duct pressure decay test
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bhankiii
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#1

Re: How to calculate the volume of a "pair of pants"

12/04/2007 11:52 AM

Sounds like something more suited to measurement than calculation.

Fill a tub with water. Stand naked in tub up to your waist. Record increase in water volume. Subtract out a bit for your feet. Add in a bit if you wear your jeans loose.
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Hendrik
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#5
In reply to #1

Re: How to calculate the volume of a "pair of pants"

12/04/2007 1:03 PM

With or without temperature control?

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CrowdedMill
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#2

Re: How to calculate the volume of a "pair of pants"

12/04/2007 12:07 PM

Inflate balloons inside of the pants to hold the pants in an expanded position.

Fill a measured container to the very top.

Submerge the pants to displace the water over the top of the container.

Remove the pants, and measure displacement.

NOTE: You may want to submerge the pants relatively quickly if the balloons don't occupy all of the volume of the pants.

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#3

Re: How to calculate the volume of a "pair of pants"

12/04/2007 12:23 PM

Do you have a sketch?

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All About M.E.
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#4

Re: How to calculate the volume of a "pair of pants"

12/04/2007 12:58 PM

Can't we just break the pair of pants into cylinders and get close?

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Ried
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#21
In reply to #4

Re: How to calculate the volume of a "pair of pants"

12/10/2007 9:23 AM

BTW, I cannot view these images. Any way to get a look at this?

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#24
In reply to #21

Re: How to calculate the volume of a "pair of pants"

12/10/2007 3:06 PM

I don't know what happened to the pics, I would have to regenerate them. Basically I sketched two long cylinders for legs and one short, wide cylinder for the trunk portion. My question was along the lies of braking the "Pair of Pants" into a set of cylinders, which we know the volume calulation for.

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#6

Re: How to calculate the volume of a "pair of pants"

12/04/2007 1:03 PM

Some guys just get the coolest jobs. Sigh.
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Mr. Truman Brain
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#7

Re: How to calculate the volume of a "pair of pants"

12/04/2007 1:27 PM

Can you break it down into easy calculable pieces! Like the two legs, and the center section?

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nam70
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#8

Re: Calculating the Volume of a "Pair of Pants"

12/05/2007 3:09 AM

Please tell more about "Pair of Pants"!!!

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#9

Re: Calculating the Volume of a "Pair of Pants"

12/05/2007 11:56 AM

Regarding the phrase 'pair of pants', Who can tell me what a single pant looks like??

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#10
In reply to #9

Re: Calculating the Volume of a "Pair of Pants"

12/05/2007 11:59 AM

And why is "brassier" singular but "panties" plural?

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#11
In reply to #10

Re: Calculating the Volume of a "Pair of Pants"

12/05/2007 12:00 PM

The plot thickens!! Yeh! And who thought of a pair of trousers? What is a trouser?

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#14
In reply to #10

Re: Calculating the Volume of a "Pair of Pants"

12/05/2007 10:35 PM

Shall we start another thread on this one?

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#12

Re: Calculating the Volume of a "Pair of Pants"

12/05/2007 2:51 PM

A 'pair of pants" or "pants leg" is a duct transition from a single trunk to two parallel trunks that looks like(surprise) a pair of trousers.

Break the transition into three or more shapes, calculate the volume of each shape, and sum the numbers.

Or seal the ends, fill with water, and measure the gallons required to fill it up.

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#13
In reply to #12

Re: Calculating the Volume of a "Pair of Pants"

12/05/2007 8:06 PM

We call 'em bionic pantyhose

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Anonymous Poster
#15

Re: Calculating the Volume of a "Pair of Pants"

12/06/2007 8:59 AM

With or without you in them?

Fill them with plaster then do a water tank test. Portland cement will work too.
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billblack
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#16

Re: Calculating the Volume of a "Pair of Pants"

12/07/2007 9:11 AM

Got a CAD file?

Most 3d CAD programs will give you the volume of any shape you can model or scan.

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shogun7
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#17

Re: Calculating the Volume of a "Pair of Pants"

12/07/2007 7:36 PM

pAIR OF PANTS( DUCT WORK) GO FIGURE
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#18
In reply to #17

Re: Calculating the Volume of a "Pair of Pants"

12/08/2007 8:31 AM

Is that an American pants or an English trousers?

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#19
In reply to #18

Re: Calculating the Volume of a "Pair of Pants"

12/09/2007 11:09 PM

Great overlay. I like the patch on the knee...

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#20
In reply to #18

Re: Calculating the Volume of a "Pair of Pants"

12/10/2007 9:21 AM

I think you've got the picture. To answer the question, I believe pants and trousers are similar with different terminology used depending on which side of the pond you are on. With ventilation ductwork, the trunk and legs are usually square transitions. Therefore, to compute the volume, split the shape into sections that are simpler to calculate and sum the volumes of the pieces.

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#22
In reply to #20

Re: Calculating the Volume of a "Pair of Pants"

12/10/2007 2:26 PM

Just having a bit of fun! If you check out post #7, you see my views on the problem, only you got the good answer thumbs up and I got another cider out of my own fridge!

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#23
In reply to #22

Re: Calculating the Volume of a "Pair of Pants"

12/10/2007 2:34 PM

Obvisously my tongue is too far in my check for you to spot my sarcasm. Have a cider for me also, glad to have other folks that aren't overly serious about life.

Yes, your answer is also correct, but with the other posts I thought is needed to be repeated a bit more s-l-o-w-l-y.

I always seem to do better with the simpler questions.

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Users who posted comments:

All About M.E. (3); Anonymous Hero (1); Anonymous Poster (1); bhankiii (1); billblack (1); CrowdedMill (1); CSM Engineer (2); FKIA (1); Hendrik (1); Mr. Truman Brain (5); nam70 (1); PetroPower (1); Ried (4); shogun7 (1)

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