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Single screw causes $2.2M in damage


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#1 NSwanberg

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Posted 08 May 2021 - 11:00 PM

Single Screw Causes $2.2M in Damage


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#2 MSwiss

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Posted 08 May 2021 - 11:43 PM

When Koford went to 459s and setups with aluminum endbells, we found out the hard way, that Loctite should be used when using an 0-80 screw in an aluminum endbell.


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#3 Phil Hackett

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Posted 09 May 2021 - 12:24 AM

Not quite the same thing but...

 

In liquid fueled rocket engines the level of cleaniness exceeds anything you might think of.

 

Why?

 

Liquid oxygen is highly reactive and is looking for something to combine with even if it's cyrogenically cooled. If there's just a fluid running through the system everything's OK but if there is a chip, small screw, or any other debris bouncing around, that added energy can create a situation known as "hardware rich" (HR). Just a burr on an edge of a part or joint can also create HR badness even if they were not to break off. All the object needs to do is bounce against a tube, wall, blade, valve, or anything else inside the engine (oxygen side) and you get a very expensive Roman candle.

 

In the series premier of Crime Story, Ray Luca is discussing with Phil Bartoli that the world is made of little things that make bigger things and those, the little things, are the important things to control.


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