Friday, December 18, 2009

What is galled thread in oil field?

I am assuming your talking about a galled thread in an oil field? A galled mechanical thread in an oil field or any other type of application is known as: a condition where the threads %26amp; or mating threads gall, seize, or form a burr due to misalignment, fatigue, or failure...etc. Typically different materials for the mating components are used to prevent this galling. A typical use for the word is: the threads are galled up meaning they dont fit properly or are very hard or unable to loosen.What is galled thread in oil field?
Thread that has been galled is typically on the bolt. The thread will no longer be ';sharp'; as a new thread. The tip of the thread will appear to be worn down or laid over. It will make the match to the nuts much harder to make up and may be bad enough to cause the nut to slip on the bolt under load.What is galled thread in oil field?
Galled threads are threads that are messed up. This can be caused by several things. Misalignment while making up, making up to fast, improper application of thread compound, the wrong type of thread compound, or over-torqueing. Or also from just being made up too many times. Some threads can be field repaired, it just depends on the type of thread and how much load it has to bear. On some connections the threads and thread compound act as a seal, on others they have a metal-to-metal seal and the threads only bear they load. If you have more questions feel free to contact me.

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