What is the primary purpose of the taper on a pipe thread?

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The primary purpose of the taper on a pipe thread is to ensure a progressively tighter fit. This design feature allows the threads to tighten as they are screwed together, which helps create a secure seal between the pipe and the fitting. The tapered shape increases the surface contact area between the mating threads, providing a mechanical lock that becomes tighter as pressure is applied.

This tightening action is crucial in preventing leaks in fluid systems, as it enables the connection to withstand pressure without compromising integrity. The taper allows for the natural progression of engagement between the threads, making it easier to achieve a proper seal without excessive force, which could damage the threads or the pipe itself.

In contrast, while the other options may seem relevant, they do not fully capture the essential function of the taper. Couplings are not eliminated by the taper; instead, they serve different purposes in joining pipes. Length tolerances are accounted for through other methods, not specifically by the taper itself. Lastly, while a tapered thread can simplify assembly to some extent, its primary role is in creating that critical tight fit to prevent leaks.

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