Applicabale Standards 1-ASME B 16.9 for large Bore 2-ASME B 16.11 for small Bore (socket welded) 3-ASME B 16.25 for butt weld ends 4-ASME B 16.28 for small radius elbow
Ductile iron etc.
Ordering Information Certain factors are to be considered for the proper purchase of pipe elbows. These factors are:
Maximum assurance of reliable performance in-
o High pressure o High impulse o High vacuum o High vibration o High Temperature
Elbow Design An elbow provides a change in material-flow direction. This adds pressure losses to the system due to impact, friction and re-acceleration. As product enters the inlet of the elbow, it typically continues moving straight ahead to the first (or primary) impact zone. The product is then deflected at an angle toward the outlet of the elbow. The deflection angle is determined by the elbow design, the product’s characteristics, the conveying velocity, and specific load (also called the product-to-gas ratio). In many designs, the product will hit one or more secondary impact zones before exiting the elbow.
Impact forces can cause severe degradation of fragile or breakage-sensitive products, generating a large amount of fines or dust and creating quality issues. Heat-sensitive products, such as plastic pellets, can overheat on the contact surface this can result in unwanted tails or streamers on the pellet or film build-up on the surface of the elbow, which can eventually lead to product contamination. Abrasive products can cause wear, leading to work-out elbows and system leaks and causing maintenance and safety issues
90 degree elbows, also called “90 bends or 90 ells”, are manufactured as SR (Short Radius) elbows and LR (Long Radius) elbows. SR (Short Radius) elbows have a Center-to-Face dimension of 1.0 X diameter and are typically used in tight areas where clearances are an issue. LR (Long Radius) elbows have a Center-to-Face dimension of 1.5 X diameter and are the more common type and used when space is available and flow is more critical.
45 Degree Elbows 45 degree elbows, also called “45 bends or 45 ells” are typically made as LR (Long Radius) elbows.
Applications of pipe elbows: Various applications of pipe elbows are as follows:
They are manufactured to be used in flow lines for gases, fluids in industrial processes, medical, construction and many other specialized applications.
The elbows are constructed of heavy materials for rigid applications like extreme high/low temperature resistance etc.
The elbows are specifically designed for use on process and control systems, instrumentation, and equipment used in chemical, petroleum, fluid power, electronic and pulp and paper plants.
Types of 90° elbows: 90° elbows are manufactured as SR (Short Radius) elbows and LR (Long Radius) elbows:
SR (Short Radius) Elbows: These elbows have a Center-to-Face dimension of 1.0 X diameter. They are typically used in tight areas where clearance is the main issue. LR (Long Radius) Elbows: These elbows have a Center-to-Face dimension of 1.5 X diameter. They are the most common type of elbow and used when space is available and flow is more critical.
Reducing Elbow A reducing elbow is a type of fitting which is used to join two pieces of pipe of different sizes. The reducing elbow is so called because it looks like a reducing piece and elbow combined into one. Reducing elbows have different sized openings on each end and hence they can connect two different sized pipes. They are available in different materials, sizes, finishes and colors.
45° Pipe Elbow 45° Pipe Elbow is also known as “45 bends or 45 ells”. The 45° pipe elbow is used to connect tubes at a 45° pipe angle. As the name suggests, this is a pipe fitting device which is bent in such a way to produce 45° change in the direction of flow of the fluid/gas in the pipe.
Like a 90° elbow, the 45° pipe elbow also attaches readily to pipes of various materials like plastic, copper, cast iron, steel, lead, rubber etc. They are typically made as LR (Long Radius) elbows. These types of elbows are available in various sizes (in mm or inches). They are available with different male to female BSP thread connections. Providing a wide choice of colors, these 45° elbows can be manufactured to meet different specifications, in terms of size and diameter.
Male Pipe Elbows & Female Pipe Elbows Male pipe elbows and female pipe elbows are popular tube fittings which provide an angled change in the direction of a tubing run. While a male pipe elbow is used to connect fractional tube to female tapered pipe thread, a female elbow is used to connect fractional tube to male NPT thread. These types of tube fittings like male elbows and female elbows have been specifically designed for use on instrumentation, process and control systems and equipment employed in chemical, petroleum, fluid power, electronic and pulp and paper plants.
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