To make a change in the flowing direction of any material, we use Piping Elbow. Elbow helps in losing pressure to the plant system due to friction, re-acceleration, and impacts. When any products enter inside the elbow, it starts moving straight towards the outlet of the elbow. Various categories such as elbow design, products characteristics, conveying velocity and specific load or the product-to-gas ratio helps determine deflection angle by elbow design. Furthermore, the products usually hit one or more subordinate force areas before it exits the elbow.
Usually, of 90 degrees or 45-degree angle, piping elbow is a joint in two lengths of pipes leading to change in direction. On other hand, Fittingcart makes 22.5-degree piping elbows with machined ends for usage in butt welding, threaded (generally female), etc. “Piping” denotes its use in high-pressure areas, high temperature, flow or unpredictable materials.
To define distance upon which they change direction, Piping elbows are of two types as Long Radius and Short Radius. The center line of one end to opposite face is “center of face” distance and ironically, is equal to radius through which elbow is bent. The LR (long radius) has a center to face distance at 1½ x Nominal Pipe Size (NPS) (1½D)”, whereas “short radius” is even to nominal pipe size.
NPS 1/2″~48″ (DN15-1200)
ASME B 16.9 / B16.28 JIS B2311 SGP / LG DIN 2605 /2615 /2616 /2617
Carbon & Alloy Steel ASTM A234/A234M WPB/ WPC /WP11 ASTM A420 / A420M WPL6 / WPL9 JIS SGP / PY400 DIN ST37.0 / ST35.8, Stainless Steel ASTM A403 WP 304/304L 316/316L.
defines the dimensional tolerances etc. for long and short radius elbows
The inside of a radius is the weakest point of an elbow. Only the center to face dimensions and “squareness” dimensional patience match the standards by ASME B16.9. The wall thickness is up to the standard at just the weld line location and not to rest of elbow. According to the standards, the minimum tolerance or patience should lie in 12.5% of the minimum wall thickness. Only the ends of end fittings have maximum thickness.
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