What would you like to do?

What is a Faulty O Ring?

already exists.

Would you like to merge this question into it?

already exists as an alternate of this question.

Would you like to make it the primary and merge this question into it?

exists and is an alternate of .

An O-Ring is a simple rubber seal used in hundreds of thousands of applications ranging from water-tight flashlights to automotive fuel injectors to kitchen faucets. Perhaps the most widely recognized O-ring application is the solid rocket booster on the Space Shuttle.

A Faulty (defective) O-Ring is one that fails to meet design criteria. These design criteria include visual imperfections including cracks or pits in the surface, excessive mold flash, and dimensions, high temperature stability, low temperature resiliency, compatibility with various chemicals, and resistance to flattening out (called compression set or compressive stress relaxation) and similar criteria. Visual imperfections are defined in documents like MIL-STD-413, AS871, AS708, and ISO 3601/3. Criteria for thermal, chemical, and mechanical properties are defined in individual specifications for each type of material.

Contrary to popular conception, the Space Shuttle Challenger disaster in 1986 was NOT caused by a fauty (defective) O-ring. The error in this tragedy was that the design criteria -- notably the low temperature functional requirement -- was not sufficient for the application. The O-ring was made from a fluorocarbon rubber material that doesn't bounce back to its original shape quickly when it is cold (in other words, it has poor low temperature resilience). Sadly, this was well known on several levels prior to launch, yet the decision to launch at a much lower temperature than had been previously attempted was made nonetheless.

In addition, the groove into which the O-ring was placed experienced unusual movement due to the pressure of the burning solid rocket fuel. At least two different seal manufacturers notified NASA before the FIRST Shuttle launch that the motion was too much to expect an O-ring to seal reliably. However, NASA did not make the recommended design changes. As a result, the movement of the joint coupled with the lack of low temperature resiliency of the seal allowed exhaust gases to escape past the O-ring. This caused hot gas to heat up the central fuel tank, causing it to fail and causing the rear mount of the solid rocket booster to separate from the vehicle.

While he did not "discover" the poor low temperature resiliency of this type of rubber material, Richard Feynman explains this phenomenon well at http://www.youtube.com/watch?v=nkNoeJ47a_A
Thanks for the feedback!

What is faulty construction?

As far as I known, faulty construction is some kind of project that  is made of poor quality construction material. But if you've ever  seen HPL material, which can be used

What are the application of o ring?

The o rings are made from shoft material like neoprin, silicon etc. in general use of o ring for sealing whenever is required. even it can use in vacuum and at high temperatur

How do you replace an o-ring on a gijoe figure?

you have to have a small screw driver to unscrew the back of the figure. Then you open the figure up. Take off the old o ring (usually done by pulling the legs out from the pe

Which is a faulty syllogism?

Jane is a student and students like to party, so Jane must like to  party

What is faulty reasoning?

Faulty reasoning means improper or mistakes in reasoning. It can also be a propaganda technique used to manipulate how you feel about someone or something. It gives some mai

What a faulty coordination?

Faulty coordination occurs when structures that do not match in form are treated as if they did match in form. Consider this example: Buying a new car, because thefts are freq

What is faulty opinion?

the opinion that is not based on facts

What is a faulty diction?

an imperfect speech/sound quality not in accordance with prevailing standards of acceptability

What is the purpose of o rings?

They are used to seal motors or machines and rotatin pump shaft or hydraulic cylinder pistons.

What is faulty predication?

faulty predication occurs when the subject of a sentence can't "do" the verb. Here is an example: The temperature of water boils at 212 degrees. Water boild at 212 but the tem

What is faulty coordination?

Faulty coordination occurs when structures that do not match in form are treated as if they did match in form. Consider this example:Buying a new car, because thefts are frequ

What is a faulty generalization?

Faulty generalization is a mode of thinking that takes knowledge  from one group's or person's experiences and incorrectly extends it  to another.

What is faulty networking?

Tcp/ip it is a set of communication protocol, used for the internet and other similar networks it is named from two of the most imp protocol transmission control protocol