Key Features of Stainless Steel NPT Fittings

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Key Features of Stainless Steel NPT Fittings

When choosing stainless steel insert fittings, there are a few essential characteristics to look for to guarantee that they are easy to install, last longer, and handle more significant pressure.

We will go through the following characteristics and why they’re helpful in this article.

  • Lead Barb 
  • Consistent Wall Thickness 
  • Smooth Internal Surface 
  • Sharp Barbs / Serrations 
  • Corrosion Resistance 
  1. Lead Barb

As a leader, the lead barb is the first barb to enter the poly pipe. This has nothing to do with the substance lead. The lead barb is designed to be smaller than the inside pipe diameter to ensure an easy start when inserting into npt fitting.  Even if the pipe is cold and slightly oval in shape due to being stored on a coil; it is designed to be smaller than the inside pipe diameter to ensure an easy start when inserting into a poly pipe, even if the pipe is cold and slightly oval in shape due to being stored on a coil.

When the npt fitting is heated in hot water in low conditions, it becomes more flexible and easier to stretch over the barbs during fitting installation.

When choosing npt fitting an insert fitting, seek a distinctive lead barb design for quicker and simpler pipe installation. A tapered lead barb vs a blunt start insert fitting is shown in the diagram above. Avoid wasting time and stress installing blunt end fittings because of the problems.

 Sharp Serrations

The barbs or serrations serve a clear purpose: they enable the poly pipe to slip onto the fitting but make it more challenging to remove rapidly. When a pulling force is applied, the degree of barb sharpness affects how effectively they hold. Sharp barbs make pulling the pipe from the fitting almost difficult, providing excellent blow-off protection from system pressure as well as pull-off protection from pulling forces like the weight of a pump column in a submersible pump application. 

Consistent Wall Thickness

Many npt fitting on the market has significant wall thickness discrepancies. Mould shifting during the sand-casting process is a common cause of this. More material exits one side when the mould moves, leaving the other with a thinner, weaker wall. Npt fitting with thicker, uniform walls that are more durable and long-lasting.

Smooth Internal Surface

Like the constant wall thickness point, the internal surface finish is not visible at first sight and is often ignored. The smooth interior surface of a stainless insert fitting produced by swage or investment casting reduces turbulence and friction loss when water flows through the fitting.

Corrosion resistance

Stainless steel, unlike many brass alloys, does not contain zinc and is not impacted by dezincification.

Finally, npt fitting is constant from one source to the next and may be used for various purposes. Some of these characteristics are more visible than others. When all five of these characteristics are combined, you will have an excellent insert fitting that installs faster, lasts longer, and withstands more pressure.