Who knows the inside diameter of PVC pipes?

[nonamesright]

who knows what the inside diameter on pvc pipes is, or where I could find out? According to the overflow calculator I need 4 square inches of return (including 1.5x safety factor). I need to figure out what the square" on the inside of pvc is, and what outer size to meet the 4 square inch min. Would 2 x 1" returns be enough? Or 1 x 1.25", or 1 x 1.5" be enough? please let me know as I have no computer access for 48 hours and would like to plan during that time.

P.S. what drill bits are used to drill glass? Masonry? Should I pour water over the glass as I drill? What are standard precautions taken as to not crack the glass? And finally, can I drill the short side of a tank? (I'm planning on having the 2 long sides and 1 short side of a 40 breeder visible)

Thanks for the help, I don't know what id do without this forum.

[Douglas LEHMAN]

Hello
Maybe this will be close enough, dia x dia x 80% = area in square inches. 2"x2"=4"x80%=3.2 square inches. As for drilling glass you'll want to look into getting some diamond coated hole saws.

[fppf]

The ID of the pipe is its pipe size, so a 3/4" PVC pipe has an ID of 3/4". The OD of 3/4" PVC is 1.050.

The area of a circle is (pi)(r^2), so for 1" its .5"^2 x 3.14 = .785 square inches.

[BeanAnimal]

Would that I.D. measurement be schedule 10, 20, 40, 80 or 120 :)

Bean

[EnglishRebel]

Originally posted by BeanAnimal
Would that I.D. measurement be schedule 10, 20, 40, 80 or 120 :)

Bean
Doesn't make any difference. The higher the schedule the thicker the wall. Thus the OD changes.

[BeanAnimal]

Think you need to check your PVC pipe specs....

PVC pipe is all the same O.D. from schedule to schedule.

The I.D. changes.... schedule 10 pipe has a much greater area than schedule 120.

20 is commonly called "thin wall" and low pressure apps.
40 is common for drain plumbing
80 is pressure rated
120 is not very common.. .but is heavy duty.

[fppf]

Yes, thats why they call the ID "Nominal".
But even with 80 the ID is still a little larger than the nominal size.
Spears Mnfging has a good wed site, they have PDF's for the specs on there 40 and 80 parts will all dimensions on them.

[schristi69]

Originally posted by EnglishRebel
Doesn't make any difference. The higher the schedule the thicker the wall. Thus the OD changes.

If that were the case then you would need fittings for each schedule of pipe. :) Go check your plumbing department. a 3/4 PVC elbow will fit any of the schedules of 3/4 pipe. The size is the OD of the pipe, not the ID. The schedule determines the pressure handling capabilities of the pipe, which means a thicker wall, which means a smaller ID. Now for the guy that wants to know the ID of the pipe....determine what schedule you want and take your butt to the hardware store and MEASURE it. :)

[EnglishRebel]

I stand corrected - I don't know where my head was (boy is it dark in here :lol: ) must have been in the conversion from UK to US :rolleye1:. However I think we're both wrong as the OD for 4" schedule 40, 80, & 120 is 4.5" and the ID for schedule 40 is 3.998", for Schedule 80 it's 3.786" and schedule 120 is 3.574". Only for 14" diameter and above does the OD relate to the pipe size. SDR series are thin wall pipes but still have the same OD. So yes the fittings will fit all schedules but because it says 4" doesn't mean it's 4" OD or ID as fppf says "it's nominal".
Check this chart (as I should have):
http://www.harvel.com/pipepvc-sch40-80-dim.asp

[MarkS]

Originally posted by schristi69
The size is the OD of the pipe, not the ID.

No no no no no! Wrong!

The size listed is the nominal ID of the pipe. The OD of 3/4" PVC pipe is 1.050", regardless of the Schedule. 1.5" PVC has an OD of 1.88" and an ID of approx 1.5", 2" PVC is 2.38" and an ID of approx 2", 3" is 3.5" with an ID of approx 3", and 4" is 4.5" with an ID of approx 4". When you buy x" PVC pipe, you are pipe that has an ID of approx. x".

[sjm817]

Here is the diff between Sched 20 and 40 1" pipe

http://reefcentral.com/gallery/data/500/71647PICT1602.jpg

[EnglishRebel]

Apparently there's a problem with inserting URLs and mine did not take properly. So here is the table I tried to link to.




SJM817
These sizes appear to differ from the ones you quoted. Where did you get your data?

[ToeCutter]

If only the U.S. went metric when they warned us back in the Ford presidency. I was ready!

The nominal dimension of PVC pipe is fairly far from its actual ID. PVC sizes descended from other materials, like Iron Pipe.

Supposedly, the ID of some pipe material, somewhere, someday was actually 1/2" or 3/4", etc. But, wall thicknesses changed, and it wouldn't make sense to change the OD, since that would mean changing all of the fittings, too.

This page has more info and a chart that shows actual IDs of sch40, 80, etc.

http://www.gizmology.net/pipe.htm

[BeanAnimal]

Yes, the numbers have descended from iron pipe. Actually I think it is galvanized pipe that USED TO relate directly.

Bean

[sjm817]

Originally posted by EnglishRebel


SJM817
These sizes appear to differ from the ones you quoted. Where did you get your data?
Those are scraps of pipe I had from a project