Quote from : Wikipedia : Caisson
In geotechnical engineering, a caisson is a retaining, watertight structure used, for example, to work on the foundations of a bridge pier, for the construction of a concrete dam, or for the repair of ships.
These are constructed such that the water can be pumped out, keeping the working environment dry.
When piers are to be built using an open caisson and it is not practical to reach suitable soil, friction pilings may be driven to form a suitable sub-foundation.
These piles are connected by a foundation pad upon which the column pier is erected.
Schematic cross section of a pressurized caisson
Shallow caissons may be open to the air, whereas pneumatic caissons, which penetrate soft mud, are sealed at the top and filled with compressed air to keep water and mud out at depth.
An airlock allows access to the chamber.
Workers move mud and rock debris (called muck) from the edge of the workspace to a water filled pit, connected by a tube (called the muck tube) to the surface.
A crane at the surface removes the soil with a clamshell bucket.
The water pressure in the tube balances the air pressure, with excess air escaping up the muck tube.
The pressurized air flow must be constant to ensure regular air changes for the workers and the height of the water in the muck tube must be carefully regulated to prevent unnecessary overpressure or low pressure which could allow excessive inflow of mud or water at the base of the caisson.
The caisson will be brought down through soft mud until a suitable foundation material is encountered. While bedrock is preferred, a stable, hard mud is sometimes used when bedrock is too deep.
Caisson disease is so named since it appeared in construction workers when they left the compressed atmosphere of the caisson and rapidly reentered normal (decompressed) atmospheric conditions. It is caused by the same processes as decompression sickness in divers.
Construction of the Brooklyn Bridge, which was built with the help of caissons, resulted in several workers being either killed or permanently injured by caisson disease during its construction, one of those injured being the designer's son, Washington Roebling.
Caissons have also been used in the installation of hydraulic elevators where a single-stage ram is installed below the ground level.
Caissons, codenamed Phoenix, were an integral part of the Mulberry harbours.
Quote from : Wikipedia : Troubleshooting
Troubleshooting is a form of problem solving, often applied to repair failed products or processes.
It is a logical, systematic search for the source of a problem so that it can be solved, and so the product or process can be made operational again.
Troubleshooting is needed to develop and maintain complex systems where the symptoms of a problem can have many possible causes.
Troubleshooting is used in many fields such as engineering, system administration, electronics, automotive repair, and diagnostic medicine.
Troubleshooting requires identification of the malfunction(s) or symptoms within a system.
Then, experience is commonly used to generate possible causes of the symptoms.
Determining which cause is most likely is often a process of elimination - eliminating potential causes of a problem.
Finally, troubleshooting requires confirmation that the solution restores the product or process to its working state.
In general, troubleshooting is the identification of, or diagnosis of "trouble" in a [system] caused by a failure of some kind.
The problem is initially described as symptoms of malfunction, and troubleshooting is the process of determining the causes of these symptoms.
A system can be described in terms of its expected, desired or intended behavior (usually, for artificial systems, its purpose).
Events or inputs to the system are expected to generate specific results or outputs.
(For example selecting the "print" option from various computer applications is intended to result in a hardcopy emerging from some specific device).
Any unexpected or undesirable behavior is a symptom.
Troubleshooting is the process of isolating the specific cause or causes of the symptom.
Frequently the symptom is a failure of the product or process to produce any results.
(Nothing was printed, for example).
The methods of forensic engineering are especially useful in tracing problems in products or processes, and a wide range of analytical techniques are available to determine the cause or causes of specific failures.
Corrective action can then be taken to prevent further failures of a similar kind.
Preventative action is possible using FMEA and FTA before full scale production, and these methods can also be used for failure analysis.
Originally posted by Robert Reynolds
This is just a big distraction, I bet once they've plugged it we'll get back to other things only to find out that our families are in detention camps run by shape-shifting Freemasons.
Uhm..yes, me. I am watching it unfold live.
Originally posted by ChrisCrikey
reply to post by Just Wondering
That would explain why it looks worse today and why they are no longer showing the BOP. Thanks for posting this info, Just Wondering. Can you give a source for that information?
Originally posted by jackflap
This whole thing has me really ticked off. I posted in another thread a link that will take you to the BP response site. At this site you can ask questions. I suggest we all keep doing that. I personally am still waiting for a response to my questions and will post them when and if I get a reply from them.
Here is the site.
Deepwater Horizon Response Site
The problem with that is, jackflap, the website and response system is just to make the appearances of giving a fuzzy rats behind, which is further from the truth. It is just first level of layered bureaucracy, to confine the damage, something they do know how to do, containing damage, to their paychecks and shareholders. Like I mentioned earlier, BP PLC should be fined by the hour, until they get it cleaned up.
Just wondering if you people ever got my first inquiries. They had to do with the publicity stunt that BP put on for the Obama vist. In which workers were bussed in before his visit, and then bussed out when he left. I also questioned if this was in fact a way to get cap and trade passed more quickly. I also asked if the clean up effort is being taken seriously. In my original submission I left a link to an article where all these concerns were raised. I appreciate your anticipated response.