Know about pipe threading....cont.

-

The difference between NPT, BSPP and BSPT seals

As I told in my previous post, Now follow a bit of information about different pipe threading and their compatible sealing.

NPT Connections
NPT (National Pipe Thread) seals are the most popular type of seal for pressure calibration systems in the U.S. and Canada. NPT male adapters have a taper thread that wedges into the female NPT adapter. They seal due to the “out of roundness principle” which means that the male stretches the female fitting until there is so much force that the connection can hold pressure. One of the challenges with this design is that if you connect stainless steel to stainless steel then over-tightening or poor lubrication can cause damage to the threads. Thread sealant is needed to seal but only 2 turns of thread sealant is required. Any more than that and the seal can leak around the thread sealant.
BSPT Connections
BSPT (British Standard Pipe Taper) is similar to NPT except for one important difference. The angle across the flanks of threads (if you sliced the fitting in half long-ways and measured the angle from root to crest to root) is 55 degrees and have rounded peaks and valleys instead of 60 degrees as it is for NPT having flattened peaks and valleys. Thus an NPT male will fit into a BSPT fitting or vice versa but they will not seal. This is a popular fitting in China and Japan but is very rarely used in North America unless the equipment to which it is attached was imported. Thread sealant is needed to seal the male and female fitting together.


BSPP Connections
BSPP (British Standard Pipe Parallel) is most popular in the UK, Europe, Asia, Australia, New Zealand and South Africa. It is a parallel thread fitting that uses a bonded seal ring to do the sealing. This bonded ring seal is sandwiched in-between a shoulder on the male fitting and the face of the female fitting and is squeezed in place. BSPP pressure gauges have a longer male thread and use a copper crush washer that is squeezed in between the bottom of the male fitting and the bottom of the female BSPP hole forming a pressure tight seal. No thread sealant is needed to form a seal.

This is end of the pipe threading. If any one wants to know some specific information the feel free to comment in the post. I personally welcome any suggestion or more information regarding the post content.

Comments

Post a Comment

Popular posts from this blog

What do you mean by CryoVolcano?

-
Image
A cryovolcano (colloquially known as an ice volcano ) erupts slurries of volatile compounds such as water or methane instead of lava. These substances are usually liquids and form plumes, but can also be in vapour form. After eruption, cryomagma condenses to a solid form when exposed to the very low surrounding temperature. Cryovolcanoes form on icy moons, and possibly on other low-temperature astronomical objects (e.g., Kuiper belt objects). The energy required to melt ices and produce cryovolcanoes usually comes from tidal friction. It has also been suggested that translucent deposits of frozen materials could create a sub-surface greenhouse effect that would accumulate the required heat. Ice volcanoes were first observed on Neptune's moon Triton during the Voyager 2 flyby in 1989. On November 27, 2005 Cassini photographed geysers on the south pole of Enceladus. Indirect evidence of cryovolcanic activity was later observed on several other icy moons of our Solar Sys
Read more

How to Backup up hardware key

-
Image
If you have a industrial software which uses hardware key to authenticate the license, then it is very difficult to run the software without the key dongle plugged in. Their is a chance that the key might be stolen as it looks just like pen drive. If the key dongle is stolen, then the software will not run and you have to buy another license key dongle if  you are not under service contract. In this article I'll describe you with the method by which you can backup your hardware dongle to enable you to run the software without the key dongle plugged in. Note: All the steps has to be done while the dongle is plugged in and the application is running. Step 1. Download Sentinel key reader Dumper.exe . This is used to dump the key file in the dongle which is otherwise impossible to read. Note: This can only be used with Sentinel SuperPro/UltraPro keys . The best way to find whether your key is Sentinel is that when you run the application dumper.exe, it will not show the mess
Read more

What is atomic clock?

-
Image
 Have you wondered how time works?  What do you mean by 1 sec?  How the duration of 1 sec is decided? All these questions will be answered when you understand the atomic clock. World time is based upon a reference and that reference is the atomic clock.  What is atomic clock An atomic clock is a clock device that uses an electronic transition frequency in the microwave, optical, or ultraviolet region of the electromagnetic spectrum of atoms as a frequency standard for its timekeeping element. i.e. locking an electronic oscillator to the frequency of an atomic transition. The transition is generally between hyperfine level which is a small shifts and splittings in the energy levels of atoms resulted from interaction between the magnetic moments associated with electron spin and the electrons' orbital angular momentum. Elements used for atomic clock 1. Cesium-133 2. Rubidium-87 Cesium atomic clock It employ a beam of cesium atoms. The clock separates cesium at
Read more