Other types of thread sealants are liquids, which have their own advantages & disadvantages. Generally speaking, “PTFE” tape is recommended. The tape you choose needs to be compatible with the gases you will be using, otherwise leaks may form. It is important to ensure the tape you use is suitable for your application. Thread sealant is most commonly ‘thread tape,’ sometimes called ‘PTFE tape’ or ‘Teflon tape.’ Secondly, it provides lubrication between the threads to prevent galling (thread damage resulting in seizure). Firstly, the thread tape fills any micro-gaps between the threads which may not be filled when the threads deform, preventing leaks. It is important to use thread sealant when connecting tapered fittings for two reasons. This differs from other types of gas-tight seals where the thread is used only to apply force to a separate sealing method, like a compression fitting or flat face seal. For this reason, tapered threads can only be re-used a finite number of times. The seal occurs on the first few winds of thread, counting from the end of the male fitting. Tapered threads are sealed when the threads of both the male and female fittings deform into each other, as the fitting is tightened. NPT threads are called ‘male’ or ‘female’, sometimes abbreviated NPTM for male (external) threads and NPTF for female (internal) threads. Most commonly ¼” NPT is used but occasionally 1/8” NPT is used for smaller fittings, such as for lecture bottles or miniature regulators. National Pipe Thread standards include specifications for many different sizes between 1/8” and 24”. For most of the world, the commonly used standard for specialty gas applications is National Pipe Thread, or “NPT.” You will find NPT threads on most specialty gas oriented gas control equipment, including pressure regulators, manifolds, outlet points, line regulators, and point of use panels. Depending on where you are in the world, you may find different tapered thread standards being used. Tapered thread fittings are commonly used to connect gas fittings in many different industries and applications. ![]() In this article, we’ll focus on one type of fitting: tapered thread fittings. However your system is designed, there will be many gas-tight connections. This can be as simple as a single cylinder regulator or a complex system involving a manifold, pipelines, line regulators, outlet points, or a long list of many other components. In order to deliver gases from a cylinder to the point of use, a gas delivery system is used. ![]() Regulator & Gas Control Systems Assessment.ISO 17025 Mixtures in Non-Refillable Cylinders.Light Liquid Hydrocarbons & Liquid Reference Materials.
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