Dumb Question 1

[dhot]

I am in a heated discussion with my brother. HE installs piping and I design pipe lines. How much does a 100 foot section of pipe fall at 2% slope 12" pipe. I am not going to say our answers as i don't want to pursuade anyone.

 

[Unotec]

Haha, I think I know what the argument is about. In any event, in my world, regardless of pipe diameter, a 2% slope in a 100' section means would fall 2'

 

[dhot]

Sorry I missed a decimal point it is 0.2% per 100 ft.

0.2%=0.002
.002*100=.2 (Tenths)
0.2*12=2.4 (inches)

I was right if my calculations are correct. He said it was 2 inches and I said it was more than 2.

 

[zdas04]

And a 0.2% drop would fall 0.2 ft in 100 ft. Regardless of pipe diameter (how could that possibly be a factor?).

David

 

[jgailla]

I have noticed a lot of contractors call 0.2%, 0.4% just 2%, 4%. We had a sanitary sewer at 0.4% and the contractor said "we put it in at 4%, just like on the plans." It was constructed at the right slope (0.4%).

 

[TGS4]

Slightly off-topic, but this reminds me of an audio clip I heard last year about Verizon and their customer service people (including a Manager), not knowing the difference between 0.02 cents/KB and 0.02 dollars/KB.

Here's one clip -

http://media.putfile.com/Verizon-Bad-Math

 

[DSB123]

dhot,
Maybe your brother was using metric feet. (10 inches to the foot)

 

[dhot]

He was using tenths but saying inches. "the pipe falls two inches" he should have said "the pipe falls two tenths".

That Verizon thing is funny. I wonder if it actually happens. I have to look at my bill.