carbon steel long (short) radius return (WPL3, WPL6, WPL9)

Bangdong Supply A234 WP11 Buttweld Fittings,A234 WP5 Buttweld Fittings,A420 WPL6/WPHY52 Buttweld Fittings.Pipe comes in a very wide range of sizes in which with Power and Process piping, designers utilize standards controlled by organizations such as ASTM and ASME.The most common industry pipe sizes includes ¼" through to 12″ NPS and larger sizes typically increase in 2″ increments thereafter. The Nominal pipe size (NPS) pertains to the pipe size by name only, as the actual outside diameter or O. D. is different for the 12″ and under size range.

Most elbows are available in short radius or long radius variants. When the two ends differ in size, the fitting is called a Reducing Elbow or reducer elbow.

Elbows are categorized based on various design features as below:

Long Radius (LR) Elbow is also called   LR Elbow – means the radius is 1.5 times the pipe diameter

L/R 45°Elbow: Long radius 45 degree elbow changes the direction by 45 degrees.

L/R 90°Elbow: Long radius 90 degree elbow changes the direction by 90 degrees.

L/R 180°Elbow: Long Radius 180 degree return bend allows complete reversal of flow.

Short Radius (SR) Elbow is also called Sr Elbow , – means the radius is 1.0 times the pipe diameter

Short radiu 45°Elbow: Short radius 45° elbow changes the direction by 45 degrees.

Short radius 90°Elbow: Short Radius 90° elbow is same as LR90 except for the measurement between end of elbow to center line is 1 x NPS.

Short radius 180° Elbow: Short Radius 180° return bend allows complete reversal of flow

Following are the specifications of this range:

Size: 1/2"NB TO 48"NB IN

Schedule: SCH 10, SCH 20, SCH 30, SCH 40, STD, SCH 80, SCH XS, SCH 60, SCH 80, SCH 120, SCH 140, SCH 160, SCH XXS

Type: Seamless / ERW / Welded / Fabricated

Form: 15 Deg Elbow, 30Deg Elbow, 45 Deg Elbow, 90 Deg Elbow, 180 Deg Elbow, Short Radius, Long Radius, 3D, 5D, 6D, 8D, 10D & 2

Use of induction bending is especially beneficial where laminar flow is desired. This technology can replace most elbows and fittings used in traditional 

designs.

Elbow Reduced

90 Reducing Elbow

Elbow In Different OD

A403 304/304L Elbow

Special Elbow

Reduced Elbow

Reducing Elbow

 Elbow 45° - 90° - 180° LR/SR

The function of a elbow is to change direction or flow in a piping system. By default, there are 5 opportunities, the 45°, 90° and 180° elbows, all three in the "long radius" version, and in addition the 90° and 180° elbows both in the "short radius" version.

Long and Short Radius

Elbows are split into two groups which define the distance over which they change direction; the center line of one end to the opposite face. This is known as the "center to face" distance and is equivalent to the radius through which the elbow is bent.
The center to face distance for a "long" radius elbow, abbreviated LR always is "1½ x Nominal Pipe Size (NPS) (1½D)", while the center to face distance for a "short" radius elbow, abbreviated SR even is to nominal pipe size.

Here below, for example, you will find the
center to face distance of NPS 2 elbows
(the A distance on the image)

1. 90°-LR : = 1½ x 2(NPS) x 25.4 A=76.2 mm

2. 180°-LR : = 2 times the 90° LR elbow A=152.4 mm

3. 90°-SR : = 2(NPS) x 25.4 A=50.8 mm

4. 180°-SR : = 2 times the 90° SR elbow A=101.6 mm

3D elbows as an example, are calculated with:
3(D) x 2(NPS) x 25.4

45° Elbow

The function of a 45° elbow is the same as a 90° elbow, but the measurement of dimensions is different to that of the 90° elbow.

The radius of a 45° elbow is the same as the radius of the 90° LR (1½D). However, the center to face dimension is not equivalent to the radius as in 90° LR elbows. This is measured from each face to the point of intersection of the center lines perpendicular to each other, distances B on the image. This is due to the smaller degree of bend. Short radius 45° elbows are not available.

Standards

The most applied version is the 90° long radius and the 45° elbow, while the 90° short radius elbow is applied if there is too little space. The function of a 180° elbow is to change direction of flow through 180°. Both, the LR and the SR types have a center to center dimension double the matching 90° elbows. These fittings will generally be used in furnesses or other heating or cooling units.
Dimensions, dimensional tolerances and more images, can be found in the main Menu "Fittings".

In addition to the defined elbows, there is the Reducing Elbow, which is a elbow with various diameters on the ends. Because this elbow, for many suppliers it is not a standard item, and thus probably a high price with a long delivery time, the use of a "normal" elbow with a separate reducer is an option if the situation allows.

Other degrees elbows can be machined from a standard elbow. Longer radius type, the center to face dimension e.g. is three times the nominal size (3D), even is available.

Dimensions, dimensional tolerances etc. for long and short radius elbows are defined in Asme B16.9.

Wall Thickness of Elbows

The weakest point on an elbow is the inside radius. ASME B16.9 only standardizes the center to face dimensions and some "squareness" dimensional tolerances. The wall thickness at the weld line location even is standardized, but not through the rest of an elbow. The standard states that the minimum tolerance will be within 12.5% of the minimum ordered wall thickness of the pipe. A maximum tolerance is specified only at the ends of the fitting.

Many providers of buttweld elbows (and tees) provide one schedule greater thickness so that sufficient wall thickness, after forming, remains.

Product Categories : Butt Weld Pipe Fitting > Pipe Elbow/Bend