Why I don’t like to use NPT threads in our hydro carbon systems?

NPT thread is not in my favorite threads due to many reasons. The first reason for disliking NPT thread is that there are too many accidents which are associated with NPT threads. Secondly I have many alternatives available which are safer than using NPT thread. It is very easy to make a mistake when you are using NP thread as it is very similar to ISO 7-1 BSPT which is also known as (tapered thread). Due to difference of angle between NPT and BSPT thread they will going get fit not perfectly sealed due to which high chances of leakage. NPT thread can also be fit with cylindrical thread but yet there will be perfect seal between the thread. To connect NPT male thread with female thread it is important that female thread is also NPT.

There are two kind of thread which are commonly use. One is NPT and the other is NPTF. It’s hard to identify the difference between NPT and NPTF with a naked eye.  For NPT thread to get seal it is important to use tape and paste. Without tape we will face the issue of spiral leak space between the threads when they will be out in the atmosphere.