SpudFiles

does SDR21 Pipe fit into DWV pipe.

In Australia its all I can get

You dont need to sleeve golf ball pipe, It should be fine. I used a 4 and a half foot long peice and it held up fine!

yeah, but at what pressure ?

SDR is'nt maid for pressure, the only reason its sleeved is for support, a long barrel would snap under its own weight.

so does anyone here use DWV, is it the same size as 2" or 1.5"

Atlantis wrote:SDR is'nt maid for pressure, the only reason its sleeved is for support, a long barrel would snap under its own weight.

Hmmm thats funny, SDR21 is rated to 200psi. And I have a gun with a 4 and a half foot unsleeved sdr21 gb barrel, and I shoot that gun whenever I get bored, Theres nothing else to do so I shoot it ALOT!

Bah!

Internal pressure is not a concern in most cases. Hell, as far as ratings go, 4" sch 40 [Common chamber size] has a lower rating then that of 1.5" SDR-21. Rather external loads that the 1.5" SDR-21 experiences is the reason in which the pipe is so commonly sleeved. Such 'external loads' might include dropping, or leaning the gun up against a wall too hard. I recently chipped a end off a barrel on one of my early combustions, in which the barrel was not sleeved.

Atlantis, SDR-21 is both made for pressure, and will not fail under its own load. [Standout load to be specific] Working in construction the bit I have, Ive learned quickly that most plumbers dislike the use of sch 80 plastic piping. While if used in a environment in which it is uneffected by external loads it will withstand a great bit more of pressure, although since external loads are hard to avoid in exposed above-ground environments, sch 40 is preferred. Sch 80 piping while being stronger, is less resistant to being 'bent'. In which case it will 'snap' easier then that of sch 40. Sorry to venture...

While as far as I understand and have experienced, DWV has a similar ID to that of sch 40 piping. In which the 1.5" SDR-21 will sleeve inside of the 2" pipe, although with a very loose fit at ~.147" of difference. [Slightly greater then that of 1/8"] Presented with this circumstance you could possibly sleeve the 1.5" SDR-21 in something to bring it closer to ~<2.047", or leave it unsleeved.

brumby wrote:does SDR21 Pipe fit into DWV pipe.

In Australia its all I can get

Lol I found out it's almost impossible to get sdr21 in australia. And I only just found out mine is just a pn12 40mm pvc pipe. Fits golfballs well. Check if yours sais " PN " and then a number (ie. 7,9,12,16,18,20) 'caus that means It doesent need to be sleeved.

yeah thats what i used on my golfball gun, 40mm PN12.
if it has PN its pressure rated to that pressure e.g PN12=12bar(170psi)

Yeh same goes here 40mm Pressure Number class 12 pvc piping works great for golfballs its a near perfect fit.Hence the golfball gun i made.

And no DWV and PN 12 pipe does not fit in any pipi i no of,without alot of space on either side.