Reducing elbow

In long radius elbow, centreline radius is 1.5 times the nominal size of the pipe or you can say 1.5 times the diameter of the pipe.

Reducing elbow

When the two ends differ in size, the fitting is called a reducing elbow or reducer elbow.

Normally long radius elbows are used in piping as pressure loss is less as compared to short radius elbow. It required more space than short radius elbow.

An elbow is a pipe fitting installed between two lengths of pipe or tubing to allow a change of direction, usually a 180° or 90° angle, though 45° elbows are also made. The ends may be machined for butt welding (SW) or socketed welding(SW) etc.

Types of reducing elbow:
The reducing elbows are available in various types like:

  • 90° reducing elbow
  • 45° reducing elbow
  • 135° reducing elbow
  • 180° reducing elbow etc

Features of reducing elbows:
Some features that are available in reducing elbows are as follows:

long radius 90degree reducing
  • Usually healthy and non-toxic, free of stain and scale
  • High temperature resistance
  • High pressure resistance
  • Hot welding connection adopted
  • Leakage effectively prevented
  • Excellent heat insulation property
  • Light weight, easy to handle and transport
  • Smooth inner wall which reduces the pressure loss and increases the flow speed
  • Low noise
  • Excellent design, suitable for installation either exposed or hidden
  • Wonderful ability in chemical corrosion resistance
  • Easy and fast installation

Applications of reducing elbow:
Reducing elbows are used in a variety of applications like as follows:

  • Hot and cold water supply facilities for public buildings
  • Chemical, food, electronic industrial pipeline networks like pipeline networks for transporting all kinds of corrosive liquid
  • Pipeline networks for drinking water production system such as pure water and mineral water
  • Pipeline for air conditioning networks
  • Compressed gas pipeline facility for industry
  • Pipeline network for swimming pool
  • Pipeline network for solar energy facility
  • Agriculture production transporting system

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.

Stainless Steel 90 Degree Reducing Elbow

A324 WP elbow is the manufacturing process of ASTM A234 WPB.

Chemical Composition (%) of ASTM A234 WP11

Grade C Mn P S Si Cr Mo Ni Cu V Nb
WP11 CL1 0.05-0.15 0.30-0.60 0.03 0.03 0.50-1.00 1.00-1.50 0.44-0.65 - - - -
WP11 CL2/3 0.05-0.20 0.30-0.80 0.04 0.04 0.50-1.00 1.00-1.50 0.44-0.65 - - - -

Notes:

Mechanical properties of ASTM A234

Tensile Requirements WPB WP11CL1  WP11CL3
Tensile Strength, min, ksi[MPa] 60-85 60-85  75-100
(0.2% offset or 0.5% extension-under-load) [415-585] [415-585]  [520-690]
Yield Strength, min, ksi[MPa] 32 30 45
[240] [205] [310]

Process

Killed steel, with forgings, bars, plates, sheet, and seamless or fusion-welded tubular products with filler metal added. Forging or shaping operations performed by hammering, pressing, piercing, extruding, upsetting, rolling, bending, fusion welding, machining, or by a combination of two or more of these operations.

Heat Treatment

After forming at an elevated temperature, fittings are cooled to a temperature below the critical range under suitable conditions to prevent injurious defects caused by too rapid cooling, but in no case more rapidly than the cooling rate in still air. Heat treatment temperatures specified are metal (part) temperatures. Heat-treated fittings are to be treated according to paragraph 7 in Specification A960/A960M.

Reference Documents



An elbow is a pipe fitting installed between two lengths of pipe or tubing to allow a change of direction, usually a 180° or 90° angle, though 45° elbows are also made. The ends may be machined for butt welding (SW) or socketed welding(SW) etc.

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:

Size range:

Elbow Size

Recommended type of pipe elbows:

Materials

  • Carbon steel: ASTM/ASME A234 WPB-WPC
  • Alloy steel: --WP 22-WP 5-WP 91-WP 911
  • Low temperature steel: ASTM/ASME A402 WPL 3-WPL 6
  • High performance steel: ASTM/ASME A860 WPHY 42-46-52-60-65-70
  • Stainless steel: ASTM/ASME A403 WP 304-304L-304H-304LN-304N
    • ASTM/ASME A403 WP 316-316L-316H-316LN-316N-316Ti
    • ASTM/ASME A403 WP 321-321H ASTM/ASME A403 WP 347-347H

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Pipe elbows

Butt Weld Pipe Fitting Bevel

  • All welded pipe fittings have bevelled end to allow for ease of welding.
  • This bevel allows for full penetration weld in most cases.
  • There are two types of bevels;
    Plain Bevel and Compound Bevel: according to the bevel of welding pipe fittings construction .
  • ASME B16.28, Buttwelding Short Radius Elbows and Returns
Industrial Processes: Bending, squeezing, pressing, forging, machining and more ANSI/ASME B16.25, Buttwelding Ends
ANSI/ASME B16.25 Standard covers the preparation of butt welding ends of piping components to be joined into a piping system by welding.

Application of pipe elbows:

Petroleum, chemical, power, gas, metallurgy, shipbuilding, construction, etc.

ELL & ELLS

  • A wing of a building at right angles to the main structure.
  • A right-angled bend in a pipe or conduit; an elbow.

Pipe elbows by radius and degree

We offer multiple bend pipes, all with different specs and operative requirements.

Short radius

SR Elbows have a Center-to-Face dimension of 1.0 X diameter usually includes three angles degree ( 45°,90°,180°).

Butt weld 5D pipe bend
Long radius

The radius of LR elbow curvature of is 1.5 times the diameter of the pipe, usally includes three degrees (45° ,90°,180°)

Reducing elbow

The reducing elbow eliminates one pipe fitting and reduces the welding by more than one-third.



Fitting specification, Standard and identification

There are different varieties of pipe fittings made of various materials and available in various shapes and sizes.



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