SUB


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sub

[səb]
(petroleum engineering)
A short, threaded section of pipe used to adapt portions of the drilling string that otherwise cannot be screwed together because of variations in thread or design.

SUB

On drawings, abbr. for “substitute.”

SUB

References in periodicals archive ?
Requesting feedback after sub training is the norm, as districts with these programs strive to make them better.
Richland One, which is located in an area with many military families, has still managed to reach a sub retention rate of at least 50 percent, says Sullivan.
The words of Colinthia Gosa are those that every administrator should lung to hear: I have never, the whole time I've been here in Fulton County, felt like I was just a sub.
i]/i [member of] I} will have a countable sub cover which in turn becomes countable open cover for (X, [[tau].
i]/i [member of] I} will have a finite sub cover which in turn becomes finite open cover for (X, [[tau].
Thus U is a countable sub collection of U; V' is a countable sub collection of V, which covers X with respect to [[tau].