I just learned something new about Pitbull that's pretty cool... - Page 2 - ZX6R Forum
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post #16 of 28 Old 01-08-2017, 08:18 AM
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Well, yeah, the first part of the video is definitely connected and I personally wouldn't have wanted to skip that part. Sorry about your ADD.
LOL.. it's a plus and a curse..

Like many things,, you can complain or make the most of what you have..

One down side, is sometimes I get bored and jump ahead like in this video..
Glad I went back and watched it again, Spent the extra and have two pit bull stands.
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post #17 of 28 Old 01-08-2017, 09:21 AM
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Cool and all but something about knowing my life is in the hands by 2 O rings make my testicles cringe.
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post #18 of 28 Old 01-08-2017, 09:32 AM
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Cool and all but something about knowing my life is in the hands by 2 O rings make my testicles cringe.
Well that's why there are 2 O-rings and not just one!
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post #19 of 28 Old 01-08-2017, 10:42 AM
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Well that's why there are 2 O-rings and not just one!
Not to mention the huge amount of validation testing that would have been done on that, before it was ever allowed to be installed.... just the temperature cycling alone on something that goes into and out of direct sunlight in space many times a day is a huge issue. The pressure that the O rings are facing is pretty low in actuality, just one atmosphere.... the ones in your tires are at about two atmospheres and they hold up for years, right?

But if you are going to have it in place for up to 20 years or so, where you cannot possibly get at it to make any repairs, and it has to be as light as possible, but cost is no object?

The certification process is so long and convoluted on stuff like that, you see parts in use that were designed and qualified 30+ years ago, all the time.
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post #20 of 28 Old 01-08-2017, 10:50 AM
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Cool and all but something about knowing my life is in the hands by 2 O rings make my testicles cringe.
The Space Shuttle Challenger Disaster > ENGINEERING.com

"On January 28, 1986, seven astronauts were killed when the space shuttle they were piloting, the Challenger, exploded at just over a minute into the flight. The failure of the solid rocket booster O-rings to seal properly allowed hot combustion gases to leak from the side of the booster and burn through the external fuel tank. The failure of the O-ring was attributed to several factors, including faulty design of the solid rocket boosters, insufficient low-temperature testing of the O-ring material and of the joints that the O-ring sealed, and lack of proper communication between different levels of NASA management."
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post #21 of 28 Old 01-08-2017, 11:04 AM
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Not to mention the huge amount of validation testing that would have been done on that, before it was ever allowed to be installed.... just the temperature cycling alone on something that goes into and out of direct sunlight in space many times a day is a huge issue. The pressure that the O rings are facing is pretty low in actuality, just one atmosphere.... the ones in your tires are at about two atmospheres and they hold up for years, right?

But if you are going to have it in place for up to 20 years or so, where you cannot possibly get at it to make any repairs, and it has to be as light as possible, but cost is no object?

The certification process is so long and convoluted on stuff like that, you see parts in use that were designed and qualified 30+ years ago, all the time.
Yep, exactly. It's not like one guy came up with this design and they just went with it. Lots of testing went into it. And you're right, pressure would not be an issue here at all. Temperature would (it's pretty cold in space and O-rings don't do well at very cold temperatures, but that depends on the material of the O-ring), and also friction, they said it was a dynamic seal, meaning that shaft with the O-rings on is moving inside the bore so the seals are rubbing against the sealing surface whenever that window is opened or closed. But again...I'm sure they've done lots of testing on this before to ensure it works and it will last for many years.

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The Space Shuttle Challenger Disaster > ENGINEERING.com

"On January 28, 1986, seven astronauts were killed when the space shuttle they were piloting, the Challenger, exploded at just over a minute into the flight. The failure of the solid rocket booster O-rings to seal properly allowed hot combustion gases to leak from the side of the booster and burn through the external fuel tank. The failure of the O-ring was attributed to several factors, including faulty design of the solid rocket boosters, insufficient low-temperature testing of the O-ring material and of the joints that the O-ring sealed, and lack of proper communication between different levels of NASA management."
Yeah....shit happens even on the most basic scale unfortunately. That was a true catastrophe caused by a part that costs less than $1.

Sealing certain fluids in extreme conditions is not easy though. At my job, since I work with pressure vessels, I've had to deal with various sealing applications and different types of O-rings or other fancier seals. Sealing air at low pressure is easy. Sealing hydrogen or helium at a few thousand psi at -320 degrees F is kind of a bitch. No O-ring is capable of doing that.

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post #22 of 28 Old 01-08-2017, 11:41 AM Thread Starter
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My guess is the SRB o-rings cost more than $1. But yeah, the seals on that valve on the ISS would be very low pressure (less than 15 psi). Seals in high pressure hydraulic systems hold back thousands of psi. Heck I wouldn't be surprised the rear shock reaches those pressures when in use. Even if the seal failed on that valve it wouldn't mean instant doom, and in fact the astronaut explained how they likely would fix it. They would seal off that module then possibly repair it with a space walk.

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post #23 of 28 Old 01-08-2017, 11:53 AM
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My guess is the SRB o-rings cost more than $1. But yeah, the seals on that valve on the ISS would be very low pressure (less than 15 psi). Seals in high pressure hydraulic systems hold back thousands of psi. Heck I wouldn't be surprised the rear shock reaches those pressures when in use. Even if the seal failed on that valve it wouldn't mean instant doom, and in fact the astronaut explained how they likely would fix it. They would seal off that module then possibly repair it with a space walk.
If it leaks it just means the air inside will leak outside gradually. Slap some silly putty on there and call it good for a temporary fix

That radiator seal putty stuff that you can buy at most auto parts stores works like a charm! I've even sealed liquid nitrogen with that stuff! lol
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post #24 of 28 Old 01-08-2017, 12:00 PM Thread Starter
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I bet they have a lot of that kind of stuff available for just such an occasion!



Of course that one is for "bikes only". They would have to get the can labeled "space stations only".
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post #25 of 28 Old 01-08-2017, 01:51 PM
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The Space Shuttle Challenger Disaster > ENGINEERING.com

"On January 28, 1986, seven astronauts were killed when the space shuttle they were piloting, the Challenger, exploded at just over a minute into the flight. The failure of the solid rocket booster O-rings to seal properly allowed hot combustion gases to leak from the side of the booster and burn through the external fuel tank. The failure of the O-ring was attributed to several factors, including faulty design of the solid rocket boosters, insufficient low-temperature testing of the O-ring material and of the joints that the O-ring sealed, and lack of proper communication between different levels of NASA management."

There was sufficient testing of the O rings in the boosters..... Morton Thiokol knew they would not hold up in extremely low temps, and made NASA aware of it in 1977. NASA disregarded their warnings.

https://en.wikipedia.org/wiki/Space_...enger_disaster

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post #26 of 28 Old 01-08-2017, 02:45 PM
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This 3,500-Year-Old Greek Tomb Upended What We Thought We Knew About the Roots of Western Civilization | History | Smithsonian
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I hope your fork seals start leaking..........

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post #27 of 28 Old 01-08-2017, 04:13 PM
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Yeah....shit happens even on the most basic scale unfortunately. That was a true catastrophe caused by a part that costs less than $1.
The o-ring that failed on the Space Shuttle booster was a 12 foot diameter o-ring.
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post #28 of 28 Old 01-09-2017, 04:26 PM
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I now have more trust in my Pitbull stand(s) than I ever have before. Thanks Mr. V and thank you TDH for the edu-tainment

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