The ASME B16.5 standard governs the specifications for pipe flanges and flanged fittings used in various piping applications. This standard is widely recognized in industries such as oil and gas, petrochemicals, power generation, and water treatment, ensuring safe and reliable connections in piping systems.

ASME B16.5 Standard Pipe Flanges Dimensions:

ASME B16.5 Weld Neck Flange Dimensions (150lb-2500lb)
ASME B16.5 Slip On Flange Dimensions (150lb-1500lb)
ASME B16.5 Blind Flange Dimensions (150lb-2500lb)
ASME B16.5 Socket Weld Flange Dimensions (150lb-1500lb)
ASME B16.5 Lap Joint Flange Dimensions (150lb-2500lb)
ASME B16.5 Threaded Flange Dimensions (150lb-2500lb)

Haihao Group forged flanges engineering department,design,produce,inspect and supply our forged flanges according to the ASME B16.5 standard.The following is a detailed description of ASME B16.5 standard:

• • 1. SCOPE
  • 2. PRESSURE-TEMPERATURE RATINGS
  • 3. COMPONENT SIZE
  • 4. MARKING
  • 5. MATERIALS
  • 6. DIMENSIONS
  • 7. TOLERANCES
  • 8. PRESSURE TESTING

Forged Flanges

1 SCOPE

1.1 General

(a) ASME B16.5 standard covers pressure–temperature ratings, materials, dimensions, tolerances, marking, testing, and methods of designating openings for pipe flanges and flanged fittings. Included are:

• (1) flanges with rating class designations 150, 300, 400, 600, 900, 1500, and 2500 in sizes NPS 1⁄2 through NPS 24 and flange with rating class designation 2500 in sizes NPS 1⁄2 through NPS 12, with requirements given in both metric and U.S. Customary units with diameter of bolts and flange bolt holes expressed in inch units
• (2) flanged fittings with rating class designation 150 and 300 in sizes NPS 1⁄2 through NPS 24, with requirements given in both metric and U.S. Customary units with diameter of bolts and flange bolt holes expressed in inch units
• (3) flanged fittings with rating class designation 400, 600, 900,  and 1500 in sizes NPS 1⁄2 through NPS 24 and flanged fittings with rating class designation 2500 in sizes 1⁄2 through NPS 12  that are acknowledged in Nonmandatory Appendix E in which only U.S. Customary units are provided

(b) ASME B16.5 Standard is limited to

• (1) flanges and flanged fittings made from cast or forged materials
• (2) blind flanges and certain reducing flanges made from cast, forged, or plate materials(see table 1.1-1 through 1.1-3)
  Also included in this Standard are requirements and recommendations regarding flange bolting, flange gaskets,and flange joints.

ASME B16.5 RF CL300 ASTM A105N weld neck flanges

1.2 References

Codes, standards, and specifications, containing provisions to the extent referenced herein, constitute requirements of ASME B16.5 standard. These reference documents are listed in Mandatory Appendix Ⅱ.

1.3 Time of Purchase,Manufacture,or Installation

The pressure-temperature ratings in this Standard are applicable upon its publication to all flanges and flanged fittings within its scope,which otherwise meet its requirements.For unused flanges or flanged fittings maintained in inventory,the manufacturer of the flange or flanged fittings may certify conformance to this edition,provided that it can be demonstrated that all requirements of this edition have been met.Where such components were installed in accordance with the pressure-temperature ratings of an earlier edition of this Standard,those ratings are applicable except as may be governed by
the applicable code or regulation.

1.4 User Accountability

This Standard cites duties and responsibilities that are to be assumed by the flange or flanged fitting user in the areas of,for example,application,installation,system
hydrostatic testing,operation,and material selection.

1.5 Quality Systems

Requirements relating to the product manufacturer’s Quality System Program are described in Nonmandatory Appendix D.

1.6 Relevant Units

This Standard states values in both SI (Metric)and U.S. Customary units.As an exception,diameter of bolts and flange bolt holes are expressed in inch units only.These
systems of units are to be regarded separately as standard. Within the text,the U.S.Customary units are shown in parentheses or in separate tables following the SI
tables.The values stated in each system are not exact equivalents;therefore,it is required that each system of units be used independently of the other.Except for diameter of bolts and flange bolt holes,combining values from the two systems constitutes nonconformance
with the Standard.Nonmandatory Appendix F describes how the values expressed in SI units were established.

1.7 Selection of Materials

Criteria for selection of materials suitable for particular fluid service are not within the scope of this Standard.

1.8 Convention

For determining conformance with this Standard,the convention for fixing significant digits where limits (maximum and minimum values)are specified shall be as defined in ASTM E29.This requires that an observed or calculated value be rounded off to the nearest unit in the last right-hand digit used for expressing the limit.Decimal values and tolerances do not imply a particular method of measurement.

1.9 Denotation

1.9.1 Pressure Rating Designation.

Class, followed by a dimensionless number, is the designation for pressure–temperature ratings as follows:

Class 150  300  400  600  900  1500  2500

1.9.2 Size.

NPS, followed by a dimensionless number, is the designation for nominal flange or flange fitting size. NPS is related to the reference nominal diameter, DN, used in international standards.The relationship is ,typically,as follows:

1.10 Cases

ASME issues Cases that are applicable to this Standard by,e.g.,adding new materials or alternative construction requirements.The Cases
(a)modify the requirements of this Standard.
(b)are applicable from their issue dates until the Cases are annulled.
(c)may be used only when agreed to by the purchaser and the manufacturer,and when a Case has been so agreed to,the marking on the flange shall include the Case number.

At Haihao Group, we specialize in providing a full range of ASME B16.5 pipe flanges and flanged fittings. Whether you’re looking for weld neck flanges, slip-on flanges, blind flanges, or any other type, we have the expertise and products to meet your specific needs.

If you want to learn more about our product offerings or have any inquiries, please feel free to contact us. We look forward to partnering with you for all your piping needs.