What to use to seal tapered pipe threads?

TAPERED PIPE THREADS Tapered pipe threads (NPT) seal by contact of threads. A paste type anti-seize compound such as Parker Thread-Mate™ along with pipe thread sealing tape works most effectively with NPT threads. • 3/4 NPTUse anti-seize compound on male thread, then 2–3 wraps of Teflon®tape (if larger than 3/4 NPT, use 3–4 wraps).

How to determine the thread and end connection?

Step 1:Determine if the thread is tapered or straight (parallel) . Step 2:Measure the thread diameter . Step 3:Determine the thread pitch . Step 4:Determine the thread standard . Step 5:Identify the end connection .

What are the dimensions of taper pipe threads?

The dimensional standards for taper pipe threads are given in ASME B1.20.1. That document gives all required dimensions including number of threads per inch, pitch diameter, and normal engagement lengths for all pipe diameters.

How do you apply Teflon tape to pipe dope?

Before using pipe dope, apply Teflon tape just as you would if tape was all that you were using to make your seal. First, wash both the male and female threads to remove dirt. Then tape the male threads, beginning with a double layer around its outer edge before moving inward, following the threads’ direction as you go.

What do you need to know about tapered pipe threads?

NPS threaded connections need gaskets or O-rings to seal them. Tapered pipe threads need a sealant for leak-free connections. It fills any voids between the two threads that could cause a spiral leak. They also function as lubricants between the male and female threads. Assembling parts and pipe made of dissimilar materials need special care.

Where do you find thread on pipe fittings?

Tapered Pipe Thread is commonly found on ends of pipe, nipples and fittings (ex: couplings, elbows, tees, etc.). Sharply angled threads are very critical to joint being tight with no leaks. Thread sealant or tape is typically required to complete the seal.

What do you use to seal tapered pipe fittings?

Tapered pipe threads like NPT require the use of pipe joint compounds or tape. This sealing material seals threaded pipe fittings by blocking the spiral leak paths that runs along the pipe threads.

Which is the first step in thread identification?

The first step in thread identification is to determine whether the thread is tapered or parallel. Tapered means the thread walls, if continued lengthwise, would eventually meet. Parallel means the thread walls are straight. A seal must be used for parallel fittings in PORT applications.