ASME B16.9 Standard Specification

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 B16.9 Large diameter elbow

ASME B16.9 Large diameter elbow

ASME B16.9 Pipe elbows Interanational mark for delivery

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).

Factory-Made Wrought Buttwelding Fittings
ASME-American Society of Mechanical Engineers

ASME/ANSI B16.9 pipe end caps

36” x 26” STD SMLS/WLD BW ECCENTRIC REDUCER
ASTM A234 WP22 OR WP22W CL. 1

SCOPE

1.1 General
This 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).

1.2 Special Fittings

Fittings may be made to special dimensions, sizes,shapes, and tolerances by agreement between the manufacturer and the purchaser.
1.3 Fabricated Fittings

Fabricated laterals and other fittings employing circumferential or intersection welds are considered pipe fabrication and are not within the scope of this Standard.

Fabricated lap joint stub ends are exempt from the above restrictions, provided they meet all the requirements of the applicable ASTM material specification listed in section 5.

1.4 Standard Units

The values stated in either metric or U.S. Customary units are to be regarded separately as standard. Within the text, the U.S. Customary units are shown in parentheses.The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with this Standard.
The designation for size is NPS for both metric- and customary-dimensioned fittings. Fitting pressure rating is associated with the connecting wall thickness of pipe of equivalent size and material.

1.5 References

1.5.1 Referenced Standards. Standards and specifications adopted by reference in this Standard are shown in Mandatory Appendix II. It is not considered practical to identify the specific edition of each standard and specification in the individual references. Instead, the specific edition reference is identified in Mandatory Appendix II. A product made in conformance with a prior edition of referenced standards and in all other respects conforming to this Standard will be considered to be in conformance.

1.5.2 Codes and Regulations. A fitting used under the jurisdiction of the ASME Boiler and Pressure Vessel Code, the ASME Code for Pressure Piping, or a governmental regulation is subject to any limitation of that code or regulation. This includes any maximum temperature

limitation, or rule governing the use of a material at low temperature.

1.6 Service Conditions
Criteria for selection of fitting types and materials suitable for particular fluid service are not within the scope of this Standard.

1.7 Welding

Installation welding requirements are outside the scope of this Standard.

1.8 Quality Systems

Nonmandatory requirements relating to the fitting manufacturer’s Quality System Program are described in Nonmandatory Appendix A.

1.9 Convention

For the purpose of determining conformance with this Standard, the convention for fixing significant digits where limits (maximum or minimum values) are specified shall be rounded off as defined in ASTM E 29. This requires that an observed or calculated value shall be rounded off to the nearest unit in the last righthand digit used in expressing the limit. Decimal values and tolerances do not imply a particular method of measurement.

1.10 Pressure Rating Designation
Class, followed by a dimensionless number, is the designation for pressure–temperature ratings. Standardized designations for flanges per ASME B16.5 referenced in this Standard are Classes 150, 300, 600, 900, 1500,and 2500.

Measuring the out diameter

Pipe Fittings Dimensions Tolerance as per ASME B16.9:

Sizes 1/2″ – 48″

  • ASME / ANSI B16.9 Butt Weld Elbow – Long Radius
  • ASME / ANSI B16.9 Butt Weld Elbow – Short Radius
  • ASME / ANSI B16.9 Butt Weld Reducing Elbow
  • ASME / ANSI B16.9 Butt Weld 45° Elbow
  • ASME / ANSI B16.9 Butt Weld Fabricated Tee
  • ASME / ANSI B16.9 Butt Weld Reducer
  • ASME / ANSI B16.9 Butt Weld Concentric Reducer
  • ASME / ANSI B16.9 Butt Weld Eccentric Reducer
  • ASME / ANSI B16.9 Butt Weld 3D Elbow
  • ASME / ANSI B16.9 Butt Weld Stub Ends
  • ASME / ANSI B16.9 Butt Weld Cross
  • ASME / ANSI B16.9 Butt Weld Reducing Cross
  • ASME / ANSI B16.9 Butt Weld Tees
  • ASME / ANSI B16.9 Butt Weld End Cap
  • ASME / ANSI B16.9 Butt Weld Coupling
  • ASME / ANSI B16.9 Butt Weld Pipe Nipple
  • ASME / ANSI B16.9 Butt Weld 5D Elbow
  • ASME / ANSI B16.9 Butt Welded Pipe Fittings

ASME / ANSI B16.9 dimension

Nominal
Pipe
Size		 Outside
Diameter		 90° Elbows 45° Elbows 180° Returns
(inches)
Long Radius
Short Radius
Long Radius
Long Radius
(mm)
(inches)
Center to Face
(inches)
Center to Face
(inches)
Center to Face
(inches)
Radius
(inches)
Center to Center
(inches)
Back to face
(inches)
1/2
21.3
0.840
1 1/2
–
5/8
2
1 7/8
3/4
26.7
1.050
1 1/8
–
7/16
2 1/4
1 11/16
1
33.4
1.315
1 1/2
1
7/8
3
2 3/16
1 1/4
42.2
1.660
1 7/8
1 1/4
1
3 3/4
2 3/4
1 1/2
48.3
1.900
2 1/4
1 1/2
1 1/8
3
4 1/2
3 1/4
2
60.3
2.375
3
2
1 3/8
4
6
4 3/16
2 1/2
73.0
2.875
3 3/4
2 1/2
1 3/4
5
7 1/2
5 3/16
3
88.9
3.500
4 1/2
3
2
6
9
6 1/4
3 1/2
101.6
4.000
5 1/4
3 1/2
2 1/4
7
10 1/2
7 1/4
4
114.3
4.500
6
4
2 1/2
8
12
8 1/4
5
141.3
5.563
7 1/2
5
3 1/8
10
15
10 5/16
6
168.3
6.625
9
6
3 3/4
12
18
12 5/16
8
219.1
8.625
12
8
5
12
24
16 5/16
10
273.1
10.750
15
10
6 1/4
15
30
20 3/8
12
323.9
12.750
18
12
7 1/2
18
36
24 3/8

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 0.50
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.

Get in touch

Welcome to Sunny Steel Enterprise Ltd.

Sunny Steel provide a wide range of steel products as Steel pipes, Seamless tube and seamless pipes, Alloy pipes, Pipe fittings, Composite steel pipe used in the industry, construction etc.


Contact Form

Name

Email *

Message *

Popular posts from this blog

Barred Tee

Image
A barred tee is a tee or any fitting with a branch used in pipelines that is pigged and has a restriction bar welded internally preventing the pig from traveling down a branch connection. Barred tee is a pipe fitting that is used in a pig launcher or receiver system in a piping system to ensure the pig could pass the branch safely. Design considerations for barred tee The barred tee will be used when there is a requirement for pigging. Thus, many of its applications can be found in the pipeline or in the subsea field. The bar plates that welded internally at the branch are to avoid the pig from changing direction or getting stuck at the branch outlet. The design of the bar plates must be in sufficient quantity, thickness and adequately spaced to ensure the smoothness for the pig to run through the main pipe, and at the same time not affecting the flow that was meant to flow through the branch. Normal practice is to ensure that the opening in the branch pipeline after gui
Read more

How to Calculate a Pipe Bend?

Image
Pipe fittings are necessary to join together pipes, or to change the direction of an existing pipe. Pipes and pipe fittings are made of a variety of materials, depending on the fluid or gas being transported. Most pipe fittings tend to be either threaded or able to slip over the pipes they connect. Whether you are using steel pipes of PVC pipes, a chemical solvent is required to create a seal between the pipe and the fittings. Measure the required length of the pipe to be installed, keeping in mind the extra length required where the pipe will be inserted into the fitting. Mark this length on the pipe. How to Calculate a Pipe Bend 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 alon
Read more

ANSI Flange Standards

Image
The American National Standard Institute, ANSI, has been overseeing guidelines and standards for products manufactured through several sectors. WHAT IS ANSI? ANSI-approved flanges are used for the industrial market which handles gas, air and steam process systems. Originally formed in 1918, the American National Standards Institute is headquartered in Washington, DC, and is widely recognized as the American organization responsible for overseeing the national standards and conformity assessment system for products, services, processes, systems, and personnel. ANSI works domestically with American government agencies and organizations, as well as with international entities, to make ANSI standards useful around the world. Prior to the creation of ANSI, standards for engineering and equipment such as flanges were developed by the American Institute of Electrical Engineers (AIEE or IEEE), the American Society of Mechanical Engineers (ASME), the American Institute of Mi
Read more