What modification is typically applied to pipe threads to ensure they seal properly?

When it comes to ensuring a proper seal in pipe threads, tapering is the most effective modification. Tapered threads are designed to create a tighter fit as the threads engage, allowing for a more secure connection that helps prevent leaks. The tapering allows the threads to tighten as they are screwed together, compressing the material and filling any small gaps that might exist, which is crucial in maintaining a watertight or airtight seal.

Tapered threads are commonly found in applications involving different types of piping systems, where the pressure and fluid dynamics are significant considerations. The design of these threads is intentional, as they provide a mechanical advantage that enhances the integrity of the joint under varying pressure conditions. This is particularly important in plumbing and gas line installations, where leaks can pose safety hazards.

Other options, such as straight threads or oversized threads, do not inherently provide the same kind of seal that tapered threads do. Straight threads can lead to inadequate sealing without the proper use of additional sealing methods, such as O-rings or thread sealant. Similarly, oversized threads may not fit properly in standard pipe fittings, leading to potential leaks or joint failure. Coating threads might provide some level of sealing but is not the primary method for ensuring a proper mechanical seal