![]() ![]() The reliability of the tube grip is related to how well the gripping ferrule performs this function. As a result of this compression, the ferrule effectively bites into the tube, thus creating a strong grip and a tight seal. When the fitting’s nut is tightened, the ferrule is compressed between the nut and the receiving fitting. In contrast to threaded fittings, compression tube fittings commonly utilize ferrules to create a leak-tight seal. ![]() It can be beneficial, though, to standardize the use of one type versus the other throughout a facility to reduce potential confusion or misapplication. Generally, available threaded fittings adhere to common standards British Standard Pipe (BSP) and the National Pipe Thread (NPT) are two of the most common. Tapered threads are effective for system pressures up to 15000 psi.Īside from the noted system pressure limits, the choice between straight or tapered threaded connections is often guided by user preference. Straight threads are typically used when system pressure will not exceed 5000 psi. Tapered threads will be effective for system pressures up to 15000 psi. A good sealant will also help prevent galling (a phenomenon where two surfaces in contact seize up as a result of cold welding) during installation. A thread sealant or thread tape is required to fill in the gaps between the crests and the roots to prevent system fluids from leaking at the connection. They are constructed at an angle in relation to the centerline, whereas straight threads are parallel to the centerline. Tapered threads, meanwhile, are designed to seal as the male and female threads are drawn together. For this reason, straight threads are typically used in applications where system pressure will not exceed 5000 psi. ![]() Straight threads are designed to hold a nut onto the body of a tube fitting and rely on supplemental items, including gaskets, O-rings, or metal-to-metal contact to create a leak-tight seal. Threaded fittings come in two distinct varieties: those with straight or parallel threads, and those with tapered threads. Male threads are inserted into female threads. Threaded fittings make a connection by attaching two threaded pieces, one male (where threads project on the outside of the fitting) and the other female (where threads are found inside the fitting). How should you choose the right fitting for your needs? Let’s investigate several common fitting types along with their specific characteristics and advantages: Threaded Fittings There are a variety of types of fittings to choose from, however, and it may not always be clear which is the best choice when you’re performing maintenance on an existing system or building a new one. Used at critical connection points, fittings should provide leak-tight performance to help you maintain plant safety and operational efficiency. Reliable small-bore fluid systems should be designed and constructed with high-quality components-and one of the most important is the small-bore fitting. Your Guide to Choosing the Right Small-Bore Fittings Capital Projects Product Selection Guide.Sampling System Problem Solving and Maintenance (SSM).Process Analyzer Sampling System (PASS) Subsystem.Process Analyzer Sampling System (PASS).Sampling System Evaluation and Advisory Services.Fluid System Evaluation and Advisory Services.
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