Commercial Gas Questions

[globe trekker]

QUESTION # 1: Should we have a Commercial Gas thread?

Since we do not currently have a Commercial Gas thread, I placed this topic in the

Commercial Plumbing thread.

QUESTION # 2: Regarding Section 406.4.2 in the 2006 IFGC. How many of you

actually perform the ' Commercial Gas ' testing requirements ( i.e. - the 1/2 hr.

of testing time for every 500 cfm of pipe, or portion thereof. ). If you do,

can someone please show me the calculations of how to determine the volume

of the gas piping.

I have a Commercial Gas pipe installation and I will need to provide code

guidance on the testing of the piping install.

Thanks ya'll!!

.

 

[texas transplant]

Globe,

We require the test and witness it.

To figure the volume of the pipe the formula is:

Volume = Pi times Radius squared times length of the pipe

Pi = 3.142

make sure both your pipe radius and length are in the same units (inches or feet)

There are 1728 cubic inches in a cubic foot in case you need to convert.

So 30 foot long, 3 inch ID pipe would have a volume of 1.472 cubic feet

You have to do a seperate calc for each size of pipe (1", 2", 3" etc.)

It takes a lot of gas pipe or really large gas pipe to make 500 cubic feet of volume.

BTW it is 500 cubic feet of volume not CFM

Hope that helps, a blackboard is easier to explain with on this sort of stuff, I can't find things like Pi on my keyboard.

Here's a link to a page that shows how to calculate volume of a cylinder:

http://www.mathsteacher.com.au/year9/ch14_measurement/18_cylinder/cylinder.htm

 

[globe trekker]

Thanks texastransplant!

.

 

[Dr. J]

http://www.torrentee.com/Pipe_Volume_Capacity_Table_Jun-02.pdf

 

[texas transplant]

Dr. J,

You are taking all the fun math out of it. LOL

Thanks for the good link.