Pipe reducers

Pipe Reducers are the component in a pipeline that reduces the pipe size from a larger to a smaller bore (inner diameter).

A steel pipe reducer is a component used in the pipelines to reduce its size from large to small bore in accordance to the inner diameter.

Pipe reducers

Key Specifications/Special Features of pipe reducer

Standard: ANSI B16.9 / 16.28, ASTM A53/A106, API 5L, ASME B36.10M---1996, DIN2605 / 2615 / 2616, JIS P2311/2312

Surface treatment: Transparent oil, rust-proof black oil or hot galvanized.

Horizontal liquid reducers are usually eccentric, with a flat top that avoids the accumulation of air bubbles in the system. Eccentric reducers are used on the suction side of pumps to stop air trapping in the tubing. The gradual accumulation of air in a concentric reducer can result in a large bubble, causing the pump to stall or cavitation when drawn into the pump. Horizontal gas reducers are often eccentric with smooth bottoms, allowing condensed water or oil to drain at low stages.

Concentric Reducer vs Eccentric Reducer Differences

Concentric reducers are widely used while eccentric reducers are applied to maintain the top and bottom pipe level. Eccentric Reducers also avoids trapping of air inside the pipe, and Concentric Reducer removes noise pollution.

Manufacturing Process of Steel Pipe Reducer

There are versatile manufacturing processes for the reducers. These are made of welded pipes with the required filling material. However, EFW and ERW pipes cannot use the reducer. To manufacture forged parts, different kinds of methods are used including cold and hot forming processes. It includes the ‘Outer Die Method.’

Outer Dia Method

It is the most common method for manufacturing the steel pipe reducer. The pipe is cut and pressed in the outer die whereas, one end of the pipe is compressed into the smaller size. This method is fit for manufacturing small and medium-size reducers.

Connection Types of Pipe Reducer

Ranges from different connection types, pipe reducer could be classified with socket weld reducer and butt weld reducer.

Socket Weld Reducer vs Butt Weld Reducer

Socket weld reducer also called socket weld insert, it has three types 1, 2 and 3. Manufacturing standards comply to ASME B16.11.

The Socket Weld resists ½ of the strength of butt welding, so it is used for small-diameter pipes possessing a diameter of NPS 2 or less. Butt Weld has good strength, as it is suitable for high pressure and temperature pipelines.

Butt weld reducer ends in plan or beveled, manufactured in accordance with ASME B16.9 and welding process according ASME B16.25.

Pipe Reducer Material Types

Welded Pipe Reducers

Butt weld fittings are available in concentric reducers and eccentric reducers to reduce the flow from one size of pipe to another.

We supply steel pipe reducer with below ranges

Feature

The pipe reducer is one of the pipe fittings, which is used for connecting two pipes with varying diameters. A pipe reducer is used to change rate of fluids the flow through. Reducers are usually made by reducing pressing processes, or by expanding pressing processes or by both reducing and expanding pressing processes together, and we can also adopt stamping processes for reducers with some specifications. Reducers are categorized into types, Eccentric and Concentric Reducer. The pipe reducers are widely available in a various materials as per the demands of its applications and industries and also available in different dimensions too.

Size

Nominal pipe Outside Diameter at Bevel Center to End
DN size D1 D2 End to End
Series A Series B Series A Series B  L
20×15 26.9 25 21.3 18 38
25×20 33.7 32 26.9 25 51
25×15 33.7 32 21.3 18 51
32×25 42.4 38 33.7 32 51
32×20 42.4 38 26.9 25 51
32×15 42.4 38 21.3 18 51
40×32 48.3 45 42.4 38 64
40×25 48.3 45 33.7 32 64
40×20 48.3 45 26.7 25 64
40×15 48.3 45 21.3 18 64
50×40 60.3 57 48.3 45 76
50×32 60.3 57 42.4 38 76
50×25 60.3 57 33.7 32 76
50×20 60.3 57 26.9 25 76
65×50 76.1(73) 76 60.3 57 89
65×40 76.1(73) 76 48.3 45 89
65×32 76.1(73) 76 42.4 38 89
65×25 76.1(73) 76 33.7 32 89
80×65 88.9 89 76.1(73) 76 89
80×50 88.9 89 60.3 57 89
80×40 88.9 89 48.3 45 89
80×32 88.9 89 42.4 38 89
90×80 101.6 - 88.9 - 102
90×65 101.6 - 76.1(73) - 102
90×50 101.6 - 60.3 - 102
90×40 101.6 - 48.3 - 102
90×32 101.6 - 42.4 - 102
100×90 114.3 108 101.6 - 102
100×80 114.3 108 88.9 89 102
100×65 114.3 108 76.1(73) 76 102
100×50 114.3 108 60.3 57 102
100×40 114.3 108 48.3 45 102
125×100 139.7 133 114.3 108 127
125×90 139.7 - 101.6 - 127
125×80 139.7 133 88.9 89 127
125×65 139.7 133 76.1(73) 76 127
125×50 139.7 133 60.3 57 127
150×125 168.3 159 139.7 133 140
150×100 168.3 159 114.3 108 140
150×90 168.3 - 101.6 - 140
150×80 168.3 159 88.9 89 140
150×65 168.3 159 76.1(73) 76 140
200×150 219.1 219 163.8 159 152
200×125 219.1 219 139.7 133 152
200×100 219.1 219 114.3 108 152
200×90 219.1 - 101.6 - 152
250×200 273 273 219.1 219 178
250×150 273 273 168.3 159 178
250×125 273 273 139.7 133 178
250×100 273 273 114.3 108 178
300×250 323.9 325 273 273 203
300×200 323.9 325 219.1 219 203
300×150 323.9 325 168.3 159 203
300×125 323.9 325 139.7 133 203
350×300 355.6 377 323.9 325 330
350×250 355.6 377 273 273 330
350×200 355.6 377 219.1 219 330
350×150 355.6 377 168.3 159 330
400×350 406.4 426 355.6 377 356
400×300 406.4 426 323.9 325 356
400×250 406.4 426 273 273 356
400×200 406.4 426 219.1 219 356
450×400 457.2 478 406.4 426 381
450×350 457.2 478 355.6 377 381
450×300 457.2 478 323.9 325 381
450×250 457.2 478 273 273 381
500×450 508 529 457.2 478 508
500×400 508 529 406.4 426 508
500×350 508 529 355.6 377 508
500×300 508 529 323.9 325 508
550×500 559 - 508 - 508
550×450 559 - 457 - 508
550×400 559 - 406 - 508
550×350 559 - 356 - 508
600×550 610 - 559 - 508
600×500 610 630 508 530 508
600×450 610 630 457 480 508
600×400 610 630 406 426 508
650×600 660 - 610 - 610
650×550 660 - 559 630 610
650×500 660 - 508 - 610
650×450 660 - 457 630 610
700×650 711 - 660 - 610
700×600 711 720 310 720 610
700×550 711 - 559 - 610
700×500 711 720 508 630 610
750×700 762 - 711 - 610
750×650 762 - 660 - 610
750×600 762 - 610 - 610
750×550 762 - 559 - 610
800×750 813 - 762 - 610
800×700 813 820 711 720 610
800×650 813 - 660 - 610
800×600 813 820 610 630 610
850×800 864 - 813 - 610
850×750 864 - 762 - 610
850×700 864 - 711 - 610
850×650 864 - 660 - 610
900×850 914 - 864 - 610
900×800 914 920 813 820 610
900×750 914 - 762 - 610
900×700 914 920 711 820 610
950×900 965 - 914 - 610
950×850 965 - 864 - 610
950×800 965 - 813 - 610
950×750 965 - 762 - 610
1000×950 1016 - 965 - 610
1000×900 1016 1020 914 920 610
1000×850 1016 - 864 - 610
1000×800 1016 1020 813 920 610
1050×1000 1067 - 1016 - 610
1050×950 1067 - 965 - 610
1050×900 1067 - 914 - 610
1050×850 1067 - 864 - 610
1100×1050 1118 - 1067 - 610
1100×1000 1118 1120 1016 1020 610
1100×950 1118 - 965 - 610
1100×900 1118 1120 914 1020 610
1150×1100 1168 - 1118 - 711
1150×1050 1168 - 1067 - 711
1150×1000 1168 - 1016 - 711
1150×950 1168 - 965 - 711
1200×1150 1220 - 1168 - 711
1200×1100 1220 1220 1118 1120 711
1200×1050 1220 - 1067 - 711
1200×1000 1220 1220 1016 1120 711

Length of reducers

The length of a Reducer is very short in relation to the diameter, so in some dimensions the transition from one to another diameter is very abruptly. For example, a reducer 6″ x 2½” has a length of 140 mm. On this short distance a pipeline will be reduced from 168.3 mm O.D. to 73 mm O.D. During the design phase of a new pipe system, a piping designer certainly must think about it.

Reducers dimen

ASME B16.9

ASME B16.9 Standard covers overall dimensions, tolerances,ratings, testing, and markings for factory-made wrought buttwelding fittings in sizes NPS 1⁄2 through NPS 48 (DN 15 through DN 1200).

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ASME / ANSI B16.9 dimension

Nominal Outside Diameter 90° Elbows 45° Elbows 180° Returns
Pipe Size
Long Radius Short Radius Long Radius Long Radius
(inches) (mm) (inches) Center to Face Center to Face Center to Face Radius Center to Center Back to face
(inches) (inches) (inches) (inches) (inches) (inches)
1/2 21.3 0.84 1.5 5/8 2 1.875
3/4 26.7 1.05 1.125 7/16 2.25 1.6875
1 33.4 1.315 1.5 1 7/8 3 2.1875
1.25 42.2 1.66 1.875 1.25 1 3.75 2.75
1.5 48.3 1.9 2.25 1.5 1.125 3 4.5 3.25
2 60.3 2.375 3 2 1.375 4 6 4.1875
2.5 73 2.875 3.75 2.5 1.75 5 7.5 5.1875
3 88.9 3.5 4.5 3 2 6 9 6.25
3.5 101.6 4 5.25 3.5 2.25 7 10.5 7.25
4 114.3 4.5 6 4 2.5 8 12 8.25
5 141.3 5.563 7.5 5 3.125 10 15 10.3125
6 168.3 6.625 9 6 3.75 12 18 12.3125
8 219.1 8.625 12 8 5 12 24 16.3125
10 273.1 10.75 15 10 6.25 15 30 20.375
12 323.9 12.75 18 12 7.5 18 36 24.375

Tolerances of Welded Fittings

NOMINAL PIPE SIZE NPS ANGULARITY TOLERANCES ANGULARITY TOLERANCES
Size Off Angle Q Off Plane P
½ to 4 0.03 0.06
5 to 8 0.06 0.12
10 to 12 0.09 0.19
14 to 16 0.09 0.25
18 to 24 0.12 0.38
26 to 30 0.19 0.38
32 to 42 0.19 0.5
44 to 48 0.18 0.75

All dimensions are given in inches. Tolerances are equal plus and minus except as noted.

  1. Out-of-round is the sum of absolute values of plus and minus tolerance.
  2. This tolerance may not apply in localized areas of formed fittings where increased wall thickness is required to meet design requirements of ASME B16.9.
  3. The inside diameter and the nominal wall thicknesses at ends are to be specified by the purchaser.
  4. Unless otherwise specified by the purchaser, these tolerances apply to the nominal inside diameter, which equals the difference between the nominal outside diameter and twice the nominal wall thickness.

Applications

A steel pipe reducer is a component used in the pipelines to reduce its size from large to small bore in accordance to the inner diameter.

The length of the reduction here is equal to an average of the smaller and larger pipe diameters. Here, the reducer can be used as a diffuser or a nozzle. The reducer helps in meeting the existing piping of varied sizes or hydraulic flow of the piping systems. The usage of a steel reducer is carried out in the chemical factories and power plants. It makes the piping system reliable and compact. It safeguards the piping system from any kind of adverse impact or thermal deformation. When it is on the pressure circle, it prevents from any type of leakage and is easy to install. The nickel or chrome coated reducers extends the product life, useful for high vapor lines, and prevents corrosion.

  • Pipe Reducer
  • Hydraulic system
  • Pneumatic system
  • Pharmaceutical fittings
  • Air brake fittings
  • Gas fittings
  • Refrigerant fittings
  • Changing the piping diameter
  • Handling the expansion, misalignment or vibration problem
Reducer applications

Standard

Pipe fitting dimensions are in either metric or Standard English.

Because pipe fitting covers Pipe Fitting Dimensions several aspects, only the most common pipe fitting sizes can be given here. 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.

Some of the standards that apply to buttwelded fittings are listed below. Many organizations such as ASME, ASTM, ISO, MSS, etc. have very well developed standards and specifications for buttwelded fittings. It is always up to the designer to ensure that they are following the applicable standard and company specification, if available, during the design process.

Some widely used pipe fitting standards are as follows:

ASME: American Society for Mechanical Engineers
This is one of the reputed organizations in the world developing codes and standards.
The schedule number for pipe fitting starts from ASME/ANSI B16. The various classifications of ASME/ANSI B16 standards for different pipe fittings are as follows:

ASTM International: American Society for Testing and Materials
This is one of the largest voluntary standards development organizations in the world. It was originally known as the American Society for Testing and Materials (ASTM).

AWWA: American Water Works Association

AWWA About – Established in 1881, the American Water Works Association is the largest nonprofit, scientific and educational association dedicated to managing and treating water, the world’s most important resource.

ANSI: The American National Standards Institute

ANSI is a private, non-profit organization. Its main function is to administer and coordinate the U.S. voluntary standardization and conformity assessment system. It provides a forum for development of American national standards. ANSI assigns “schedule numbers”. These numbers classify wall thicknesses for different pressure uses.

MSS STANDARDS: Manufacturers Standardization Society
The Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry is a non-profit technical association organized for development and improvement of industry, national and international codes and standards for: Valves, Valve Actuators, Valve Modification, Pipe Fittings, Pipe Hangers, Pipe Supports, Flanges and Associated Seals

Difference between “Standard” and “Codes”:

Piping codes imply the requirements of design, fabrication, use of materials, tests and inspection of various pipe and piping system. It has a limited jurisdiction defined by the code. On the other hand, piping standards imply application design and construction rules and requirements for pipe fittings like adapters, flanges, sleeves, elbows, union, tees, valves etc. Like a code, it also has a limited scope defined by the standard.

Factors affecting standards: “Standards” on pipe fittings are based on certain factors like as follows:

BSP: British Standard Pipe

BSP is the U.K. standard for pipe fittings. This refers to a family of standard screw thread types for interconnecting and sealing pipe ends by mating an external (male) with an internal (female) thread. This has been adopted internationally. It is also known as British Standard Pipe Taper threads (BSPT )or British Standard Pipe Parallel (Straight) threads (BSPP ). While the BSPT achieves pressure tight joints by the threads alone, the BSPP requires a sealing ring.

JIS: Japanese Industrial Standards

This is the Japanese industrial standards or the standards used for industrial activities in Japan for pipe, tube and fittings and published through Japanese Standards Associations.

NPT: National Pipe Thread

National Pipe Thread is a U.S. standard straight (NPS) threads or for tapered (NPT) threads. This is the most popular US standard for pipe fittings. NPT fittings are based on the internal diameter (ID) of the pipe fitting.

BOLTS & NUTS

We are manufacturer of Flange bolts & Nuts and supply high quality

AN: Here, “A” stands for Army and “N” stands for Navy

The AN standard was originally designed for the U.S. Military. Whenever, a pipe fitting is AN fittings, it means that the fittings are measured on the outside diameter of the fittings, that is, in 1/16 inch increments.

For example, an AN 4 fitting means a fitting with an external diameter of approximately 4/16″ or ¼”. It is to be noted that approximation is important because AN external diameter is not a direct fit with an equivalent NPT thread.

Dash (-) size

Dash size is the standard used to refer to the inside diameter of a hose. This indicates the size by a two digit number which represents the relative ID in sixteenths of an inch. This is also used interchangeably with AN fittings. For example, a Dash “8” fitting means an AN 8 fitting.

ISO: International Organization for Standardization

ISO is the industrial pipe, tube and fittings standards and specifications from the International Organization for Standardization. ISO standards are numbered. They have format as follows:

“ISO[/IEC] [IS] nnnnn[:yyyy] Title” where

General standard

Standard Specification
ASTM A234 Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service
ASTM A420 Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Low-Temperature Service
ASTM A234 WPB ASTM A234 is Standard Specification for steel pipe fittings includes carbon and alloy steel material for moderate and high temperature services. WPB is one of the steel grade in this standard
ASME B16.9 ASME B16.9 Standard covers overall dimensions, tolerances,ratings, testing, and markings for factory-made wrought buttwelding fittings in sizes NPS 1⁄2 through NPS 48 (DN 15 through DN 1200).
ASME B16.28 ASME B16.28 Standard covers ratings, overall dimensions, testing, tolerances, and markings for wrought carbon and alloy steel buttwelding short radius elbows and returns.
MSS SP-97 MSS SP-97 Standard Practice covers essential dimensions, finish, tolerances, testing, marking, material, and minimum strength requirements for 90 degree integrally reinforced forged branch outlet fittings of buttwelding, socket welding, and threaded types.
ASTM A403 Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings.

Wide variety for all areas of application

DIN EN ASME
St 35.8 I
St 35.8 III
15 Mo 3
13 CrMo 4 4
10 CrMo 9 10
St 35 N
St 52.0
St 52.4
P235GH-TC1
P235GH-TC2
16Mo3
13CrMo4-5
10CrMo9-10
X10CrMoVNb9-1
P215NL
P265NL
L360NB
L360NE
P355N
P355NL1
P355NH
WPB
WPL6
WPL3
WPHY 52
WP11
WP22
WP5
WP9
WP91
WP92

Delivery

Inspection

ASTM A234 WPB eccentric reducers
ASTM A234 WPB eccentric reducers
ASTM A234 WPB eccentric reducers
ASTM A234 WPB eccentric reducers
ASTM A234 WPB eccentric reducers
ASTM A234 WPB eccentric reducers
ASTM A234 WPB eccentric reducers
ASTM A234 WPB eccentric reducers
ASTM A234 WPB eccentric reducers

Packing

For packing of carbon steel flanges with painting,we would use the bubble wrap to protect the painting.For flanges without painting or oiled with long-term shipment,we would suggest client to use the anti-tarnish paper and plastic bag to prevent the rust.

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