What is the difference between BSPP, BSPT and NPT? Have you eve confused on these questions? Searching all these information from internet? As i am engaged in the marine hardware , there will always some questions from my clients: what is the difference between BSPP,BSPT? There are some easy definition on them. Pressure systems in the process industry use different ways of sealing depending on the geographical region, size of the pressure system and the environment. There are regional differences in sealing types as well as industry preferences. For example, many pressure systems onboard ships use BSPP adapters while many applications in the oil and gas industry use NPT fittings. While one sealing style is not inherently better than another each style has its application. 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 ad...