The bend is used to change the direction of run of pipe.it advantage is can matach long distance transition requirements,so it is commonly that bends dimension according to customer design.
usually,the bends consist of 3D,5D,7D even 12D series.carbon steel bend
CONSTANTS FOR PIPE BENDS:
Formula: L = R x B (L = Length of pipe required, R = Radius of bend, B = Constant from table used to find “L”, L =30 x 1.5705 =47.115 in.or 47-1/8″) Example: Find the length of pipe required to make a 90 bend with a radius of 30″
A pipe bend means a piece of pipe which are bent to some angle to join two pipings. they can be nearly any bending radius and angles . Pipe bends are commonly produced on site to meet a specific need by hot induction bending or cold bending. A elbow means a specific pipe bend as per the standard ANSI/ASME B16.9 (or EN 10253, or other pipe fittings standards). Commonly the elbows have a bending radius of 1.5D or 1D (Here the D means nominal diameter of this bend) ,which are called “Long Radius elbow (LR elbow)” or “Short Radius elbow(SR elbow)” . and the angle of an elbow is 45 degree or 90 degree usually, some times there are also custom-designed elbows which are 30 degree,60 degree ,180 degree or other angles.
The pipe bends should be as per the standard of ANSI/ASME B16.49 which did not specific the bending radius and angle , the regular pipe bend radius are 2.5D, 3D ,5D ,7D or 8D , but it can be any other bending radius according to the design need, and bending angle can be in any degree, 5 ,10 ,15, 90 degree or any other. People said “All bends are elbows but all elbows are not bend”, it is not true . Actually “All elbows are pipe bends but not all bends are elbows” is more reasonable.
3D pipe bend : A 3D pipe bend is a pipe bend that the bend radius is 3 times the pipe outside diameter.
5D pipe bend : The RADIUS of a 5D pipe bend is actually what is 5 times the nominal diameter. So if you had a 10″ diameter pipe, the radius of the centerline of the bend would be 50 inches.
7D pipe bend
12D pipe bend
180 Degree pipe bend
Small size pipe bend: Small size pipe bending is a pipe bend that the bend radius is 3 times the pipe outside diameter.
Large size pipe bend: The large size pipe bending is used to change the direction of run of pipe.
Butt-welded pipe bend
Seamless pipe bend
High pressure pipe bend: A High pressure pipe bending is a pipe bend that used in high pressure application.
Pipe bend, Bend pipe, Pipe bending, ANSI, ISO, JIS and DIN Standards, Measures 1/2 to 48 Inches.
3, 4, 5, 6, 7, 8, 10, 45, 90 and 180D
The 90° 3d bend is used to change the direction of run of pipe.it advantage is can matach long distance transition requirements, so it is commonly that bends dimension according to customer design. usually, the bends consist of 3D, 5D, 7D even 12D series.
Pipe Bend is a generic term for any offset or change of direction in the piping. It is a vague term that also includes elbows. An elbow is an engineering term and they are classified as 90 deg or 45 deg, short or long radius. Pipe elbows have industrial standards and have limitations to size, bend radius and angle. The angles are usually 45 deg or 90 degrees. All others offsets are classified as pipe bends. Bends are generally made or fabricated as per the need of the piping; however elbows are pre fabricated and standard, and are available off the shelf. Bends are never sharp corners but elbows are. Pipe bending techniques have constraint as to how much material thinning can be allowed to safely contain the pressure of the fluid to be contained. As elbows are pre fabricated, cast or butt welded, they can be sharp like right angles and return elbows which are 180 degrees. Elbow is a standard fitting but bends are custom fabricated. In bends as the pipe is bent and there is no welding involved, there is less pipe friction and flow is smoother. In elbows, the welding can create some friction. All elbows are bends but all bends are not elbows. Bend has a larger radius then elbows. Generally the most basic difference is the radius of curvature. Elbows generally have radius of curvature between one to twice the diameter of the pipe. Bends have a radius of curvature more than twice the diameter.
How to Guarantee the Quality of Titanium Pipe Bend?
We will do strictly inspection as below step:
Visual the surface of 90 & 45 degree titanium elbow body.
Check the marking: “ANSI B16.9 ASTM B363 GR.WPT2 SMLS 90 Deg 3D Bend 6 Inch Sch40S″.
Measure the dimensions. Such as diameter, thickness, height from center to end.
Test material chemical composition of titanium bend.
According to the different manufacturing methods, thepipe bendcan be divided into three types, namely, the bending pipe, the punching pipe and the welded pipe. Which can be divided into two types of bending bending and bending. When the stainless steel tube for bending the pipe along the longitudinal direction under pressure, leading to pipe wall thickness of the pipe is shortened, the lateral pipe subjected to tensile, elongation, wall thinning and tube; center without force, deformation will not occur. The cross section of stainless steel tube is changed from round to oval. Bend in the production of the need to pay attention to, when the piping system, when the bending radius design does not require the minimum bending radius of the bend to meet certain standards.
Cold bending of pipe bend. Bending pipe in the heating process, the heating process should be slow and uniform, so as to ensure the thermal conductivity of the pipe, we should pay attention to avoid overheating and carburizing. Bending technology is widely used in the field of boilers and pressure vessels. In many industries, such as aerospace, shipbuilding and other industries, the quality of the pipe bend has a direct impact on the structural rationality, safety and reliability of the product. Therefore, bending the quality of the pipe is the most critical, and grasp the technical conditions of the pipe is the most important. In the cold bending of the pipe bend, the need to choose a reasonable mandrel formation and master the correct method of use. Because the inner side of the bending tube in bending when wrinkling, core tube is when they bend the tube relative bending radius is small, in order to obtain high quality pipe fittings, pipe is in the bending process, in which are inserted into a suitable mandrel, thereby avoiding method of flattening and wrinkling phenomenon pipe bending appears when arc. Because the tube has a certain elasticity, so when bending force is removed, a rebound angle of pipe bend. In the bending angle, should consider increasing the angle.
What is the Weight Calculation Formula for Pipe Bends?
Whether you are bending pipe for running electrical conduit or a metal project, calculating the bend for the start and end point can be an important factor. While there are different types of pipe benders on the market, they all share a common identification for the operation. Identified on all pipe benders is the size of pipe the unit will bend along with a number called the “take up.” The take up measurement is used for adding or deducting an allowance in the overall length of the bend. By following a basic process, you can calculate pipe bends regardless of the type of bender or the diameter of pipe.
Identify the take up measurement that is located on the pipe-bending shoe itself. This is the addition or deduction of measurement to the length of pipe from the front mark on the bending shoe. Also be aware that there is a second center-of-bend mark located approximately in the center of the bending shoe. Also located along the running length of the shoe are angle markings with lines. These numbers and lines correspond to actual angles that can be bent into the pipe by aligning the pipe with the angled line marked on the outside of the shoe. Bend a 90-degree angle on a ½-diameter pipe with a ½-inch bender. The process will remain the same for different sized pipes and benders, but only the take up measurement will be different. Identified on the shoe for the ½-inch pipe may be the wording “stub take up 5 inches from arrow or line.” The 5 inches is the amount you will deduct from the overall length of the 90-degree bend measurement. Use the measuring tape and pencil and place a mark at 12 inches from the end of the pipe. This will be the distance from the bend to the end of the pipe. By using the deduction measurement on the shoe, measure back 5 inches from the 12-inch mark and make a solid pencil line. Lay the pipe on a level surface and insert the pipe into the bender. The solid pencil mark should be placed 5 inches back from the 12-inch mark and should be aligned with the front mark or arrow on the bending shoe. Pull back on the handle in a smooth motion until the pipe sits at a 90-degree position to the level surface. Place the small level against the upright portion of the pipe and check for level. This will give you a perfect 90-degree bend. Check the height of the overall bend by placing the end of the tape measure on the level base and measure the end of the pipe. It should read 12 inches exactly. Practice with other angled bends by using the deduction measurement and the center of the bend mark on the shoe. All pipe benders may have their own quirks and slight measurement adjustments that will have to be done. The actual end result also depends on how well and secure you hold the pipe in the bender, prior to the first bend you place on the pipe.