What are the types of pipe threads commonly used?

The types of pipe threads commonly used are tape and straight. Tape, or Teflon tape, is used to seal threaded connections by filling the small gaps between the threads, thus preventing leaks. This is particularly important in plumbing and gas applications where a secure seal is crucial for safety and efficiency. Straight threads, on the other hand, refer to the design of the threads themselves that run parallel to the pipe’s axis. Straight threads are typically used in applications that require a mechanical fastening but may not provide as tight a seal without additional sealing methods like tape.

Understanding the characteristics of these thread types is important for proper installation and maintenance in heating systems. The other options listed do not represent types of pipe threads in common usage in the same way. For example, welded joints involve joining pipes through welding rather than threading, and socket and coupler are more about fittings than thread types. End and side are not associated with recognized types of pipe threads either.