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Seismic air cannon article link

A place to ask general spud cannon related questions.
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Seismic air cannon article link

Unread postAuthor: Solar » Sun Sep 30, 2012 4:43 pm

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Towed Sisemic array

Unread postAuthor: Technician1002 » Sun Sep 30, 2012 11:26 pm

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Re: Towed Sisemic array

Unread postAuthor: jackssmirkingrevenge » Sun Sep 30, 2012 11:36 pm



No mention of air cannons though...

http://woodshole.er.usgs.gov/operations ... airgun.htm

Turns out its a piston valve :D

Image

Image

Wikipedia suggests 2,000-3,000 psi :shock:
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Unread postAuthor: ramses » Mon Oct 01, 2012 11:37 am

Looks like they could do with a bigger pilot valve...


Although, they probably use the pilot as an air spring bumper.
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Unread postAuthor: jackssmirkingrevenge » Mon Oct 01, 2012 11:53 pm

If you look at the way the rear of the piston is shaped and how it fits into the housing there definitely is an air bumper element.

However interestingly it does not appear to be an exhaust valve though, rather the pressure differential is created by the solenoid increasing the pressure on the front side of the piston face, as opposed to reducing the pressure behind it - so it's more of a pop-off valve if you think about it.
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Unread postAuthor: ramses » Tue Oct 02, 2012 12:15 am

jackssmirkingrevenge wrote:so it's more of a pop-off valve if you think about it.


Very true. I completely missed that itty bitty air channel over on the right. It seems the leakage on the sides of the "triggering piston" even dissipate some of the KE through an air dash-pot type mechanism.
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Unread postAuthor: MrCrowley » Tue Oct 02, 2012 12:19 am

Now that's pretty cool. Didn't pick up either of those two things mentioned by you two (JSR & ramses) the first time I looked at it.
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Unread postAuthor: POLAND_SPUD » Tue Oct 02, 2012 12:33 am

However interestingly it does not appear to be an exhaust valve though, rather the pressure differential is created by the solenoid increasing the pressure on the front side of the piston face, as opposed to reducing the pressure behind it - so it's more of a pop-off valve if you think about it.

WTF?
it's just a positive pressure piloted piston valve
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Unread postAuthor: jackssmirkingrevenge » Tue Oct 02, 2012 1:05 am

POLAND_SPUD wrote:it's just a positive pressure piloted piston valve


Isn't that what I said.

Image PLS

:D
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Unread postAuthor: POLAND_SPUD » Tue Oct 02, 2012 7:50 am

so it's more of a pop-off valve if you think about it
how is that more of a pop-off? it would be more of a pop off valve if it opened at X pressure but it has a control valve

comparison fail
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Unread postAuthor: jackssmirkingrevenge » Tue Oct 02, 2012 7:52 am

POLAND_SPUD wrote:how is that more of a pop-off? it would be more of a pop off valve if it opened at X pressure but it has a control valve

comparison fail


The flow from the solenoid increases the pressure on the front face of the piston, which causes it to "pop", or rather in this case, "WHOOOOOOMPH!!!".

Ok, it's a Whooooomph-off valve :D
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