NPT 90 degree elbow is a pipe fitting for changing the direction of medium. It is used to connect pipes and fittings with different pressure. Size is below 4 Inch. The customers mostly buy 1⁄8, 1⁄4, 3⁄8,1⁄2, 3⁄4, 1, 1 1⁄4, 1 1⁄2, and 2 inch. Elbow prevails in piping system and only Pipe Bend has the same function as it. Furthermore, Pipe Bends are very similar to Pipe Elbow, except their radius.
There are many ways to classify threaded elbows, such as:
Pressure rating. Class 2000 Elbow, Class 3000 Elbow or Class 6000 Elbow.
NPT 45 degree elbow, NPT 90 degree elbow.
Forged threaded elbow can be carbon steel elbow, stainless steel elbow or alloy steel elbow. ASTM A105 carbon steel threaded fittings are very common.
LR (1.5D) or SR (1D).
Thread type. The most common thread type are NPT and BSP. The thread has internal type and external type. Among common pipe fittings, Threaded Nipples are external thread, while threaded elbow, threaded tee, threaded cap and threaded coupling are internal more often.
Thread connection is the ideal way for the situations that cannot be welded or dismantle is needed, such as flammable gas pipeline.
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