What is the difference between flare and npt

Note: appearance of your Comment below may be delayed: if your comment contains an image, web link, or text that looks to the software as if it might be a web link, your posting will appear after it has been approved by a moderator. Apologies for the delay. Just ask us! Search the InspectApedia website. Comment Form is loading comments Tel: Email: info carsondunlop. As the nut is tightened against the fitting the brass ring is deformed against the pipe itself, creating a strong seal.

For most purposes they'll provide a strong seal, but there can be some concern in cases where the pipe may be pulled away from the connection that the ring may give a little, allowing the pipe to pull out of the fitting and cause a leak. This type of connection is very common because it can be used with a wider range of pipe types and is very easy to complete. It also takes less time and care than creating a flared outlet.

A flared outlet also uses a nut and the fitting, but in this case, it's the end of the pipe itself that creates the seal.

Once the nut is placed on the pipe, a special tool called a flaring tool is used. It's placed around the diameter of the pipe near the end in a hole appropriate to that size of pipe, with a flared shape that will form the flare. Once it's secured, another tool is put into position that, when screwed down, will deform the pipe, creating a flare or cone at the end.

Once the nut is tightened down, the flared end of the pipe is mechanically trapped between the fitting and the nut, making an extremely strong connection that will require the pipe to be torn or broken to let go unless the nut is loosened.

May 7, 1. Messages: 2 Likes Received: 0. Joined: Apr 22, I need to replace a lp hose that runs from my tank to my regulator. Here is the current one:. To my Knowledge the flare d is not a compatible thread with NPT. In this video, Jamie shows you how to i The difference s come in the major and minor diameters, the root and crest of the threads. Education When used with soft copper, a special tool called a flaring tool is used to flare the tubing, modifying its shape to facilitate a tight seal with the cone-shaped flare piece.

Education NPT is a U. They are used to effectively seal pipes for fluid and gas transfer. It may be possible to simply replace these fittings to make them compatible with a PT threaded product.

For dire situations, use PFTE thread seal tape. We recommend this as a last resort though. Education However, there is a subtle difference in the thread form that differentiates the two. The major and minor diameters of both threads differ slightly. With NPT threads, after a wrench is applied, slight spaces at the major and minor diameters may exist that would allow the assembly to leak and therefore a sealing compound is used to fill any gaps.

Education Once it's secured, another tool is put into position that, when screwed down, will deform the pipe, creating a flare or cone at the end. Once the nut is tightened down, the flare d end of the pipe is mechanically trapped between the fitting and the nut, making an extremely strong connection that will require the pipe to be torn or broken to let Forget the inverted flare , the stainless might be hard for you to get a good flare on. No problem with the bending, etc.

Question is the hookup from flared fittings to what appears to be NPT female national pipe thread on the filter.

BUT there is nothing in the filter to "block off" the fuel line. Hope this is making sense. Is there a difference 'thread pitch wise' between NPT and flare fittings? Thought flare fittings were pipe thread Anyway, might I need an adapter from pipe to flare to enable the flare fitting to seat and seal off? You will need an adapter to change from flare to npt.

The flare thread is not tapered and will not seal to anything except a flare fitting. Hope this helps.