equivalent pipe diameter

Good morning Guest, very good answer. How do you input those superscripts? Also, do you happen to know of a website that has a chart for large diameter steel pipe? Thx. The one I have only goes up to 8", sch 10, 40, 80, & 160.

Here are a couple web pages with larger dimensions (and if you search around Google there are many more)

http://www.pipingdesigners.com/downloads/pipechart.htm

http://www.allsteelpipe.com/Pipe-Dimensions-Weights-Chart.pdf

http://www.magellanmetals.com/pipechart.html

The super/subscripts are done with the buttons x₂ / x² beside the emoticon button. They are hidden until you highlight the text you want to alter.

How is stated before the area of tie in header should be at least 4 times more than area of 4 inch pipe. In this way you get same down pressure drop.

Generally, you use the square of each pipe's inside diameter. A 4" pipe is 16 when squared. That times 4 pipes gives you 64. The square of an 8" inside diameter pipe is 64, so that is the minimum size you would need. As stated earlier, if your velocity is greater and you have many turns in your system, then you need a larger diameter inside. The next larger size is 10".

Schedule 40 pipe of minimum 8 inch. dia will cause some pressure rise so to be on the safrer side as the fluid velocity seems a bit high. So selecting a 10 inch. 40 schedule pipe seems to be an ideal pick.

I am connecting four 4" pipes coming out from four different heat exchangers into a single . what will be the safe header size? flow rate from each pipe will be 140 cmh. All connections are of MS pipe.

firt compute area of four 4" pipe:

A= 4 x .785 x 4 x 4 = 50.24 sq. in.

next compute diameter of header:

A = .785 x D x D

diameter of header = 8 in.