How to Cap a Steel Pipe


When you are installing steel pipe, you often have a termination point in the steel pipe closed off by a steel cap. Steel caps are either weld-on or threaded and the type you use will vary depending on the application. For the majority of home piping, you will use a threaded steel cap. A threaded steel cap has internal female threads that match the common male threads found on the steel pipe. Metal steel threads do not seal properly dry and you will need to coat the threads of the steel cap to achieve a proper seal.

Things You'll Need

  • Steel pipe with male threads
  • Wire brush
  • Plumber's round wire brush
  • Threaded steel cap
  • Pipe dope
  • Pipe wrench
  • Clean rags
  • Clean the male threads of the steel pipe by running around the threads with the wire brush. You need to make sure that the threads are clear of all dirt and debris.

  • Insert the plumber's round wire brush into the female threads of the steel cap and twist the handle of the wire brush to clean the threads of the steel cap.

  • Apply an even coat of pipe dope to the male threads of the steel pipe.

  • Thread the steel cap onto the pipe dope-coated male threads of the steel pipe and turn the cap by hand until it is tight.

  • Place the pipe wrench on the threaded steel cap and turn the pipe wrench clockwise to tighten the steel cap onto the steel pipe.

  • Wipe the pipe dope from the steel pipe with a clean rag to complete the capping of the steel pipe.

Related Searches


  • Photo Credit Hemera Technologies/ Images
Promoted By Zergnet


You May Also Like

  • How to Seal Stainless Steel Pipe Threads

    Stainless steel pipe threads are protected by sealant in order to prevent leakage, contamination and weathering. Sealing stainless steel threads also provides...

  • How to Cap a PVC Pipe

    When installing or remodeling the PVC plumbing of your home, you may wish to leave a section of PVC extending from your...

  • How to Cap a Pipe

    Pipes come in many forms and sizes and can be interconnected using various types of fittings. Copper pipes are among the most...

Related Searches

Check It Out

22 DIY Ways to Update Your Home on a Small Budget

Is DIY in your DNA? Become part of our maker community.
Submit Your Work!