ASME B16.5
An ASME B16.5 enquiry identifies the flange type, nominal size, class, material and facing under the specified edition. The standard name alone does not define a complete joint.
Dimensional reference guide
Flange Standards & Dimensions
Identify the full standard, edition, flange type and rating. Similar nominal sizes do not guarantee a matching connection.
These references help define an enquiry; they are not a declaration of stock, certification or suitability for a particular service.
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ASME B16.47
ASME B16.47 covers large-diameter steel flange requirements within its defined scope. Every enquiry must distinguish Series A from Series B.
ASME B16.47 Series A
Specify Series A explicitly when ordering a large-diameter flange to ASME B16.47. A matching nominal size does not make a Series B flange interchangeable.
ASME B16.47 Series B
Series B is a separate large-diameter flange series within ASME B16.47. Confirm its complete interface before ordering replacements or mating equipment.
ASME B16.36
ASME B16.36 is the flange reference for orifice-flange arrangements within its scope. It does not replace the design of the differential-pressure metering system.
ASME B16.48
ASME B16.48 addresses operational line blanks within its scope. Distinguish a spectacle blind, a separate spade and a ring spacer from a bolted blind flange.
MSS SP-44
MSS SP-44 is a steel pipeline flange reference. Specify the edition and project design requirements rather than treating it as a universal synonym for another flange standard.
EN 1092-1
EN 1092-1 flange enquiries use a steel flange type, DN and PN designation together with the exact material and facing requirements.
DIN
DIN describes a standards system, not one flange specification. A DIN flange enquiry needs the full standard number, edition and dimensional designation.
BS 4504
BS 4504 is a legacy flange reference that needs its full designation and contractual context. Confirm whether the project requires the original dimensions or a specified successor standard.
BS 10
BS 10 flange enquiries must state the applicable table as well as the nominal size. A table designation is not interchangeable with an ASME class or a PN label.
AWWA C207
AWWA C207 flange enquiries concern steel pipe flanges for waterworks service within the standard scope. Its class designations should not be treated as ASME classes.
API 6A
API 6A flange connections belong to wellhead and tree equipment requirements. They are not general pipe flanges or a modern name for historical API 605 flanges.
JIS
A JIS flange enquiry needs the complete standard number and edition, not only a nominal size and a K designation.
SANS 1123 / SABS 1123
State the required SANS 1123 designation and edition, or the exact historical SABS reference where specified. Current and legacy names should be reconciled in the enquiry.
GOST
GOST is a standards family. A flange enquiry requires the exact GOST number, edition and designation to identify the intended connection.
AS 2129
AS 2129 flange enquiries must specify the applicable table, material and connection form. Table designations cannot be replaced with an assumed PN or ASME class.
UNI
UNI identifies a standards system, not one universal flange design. State the full UNI number, edition and flange designation for a useful enquiry.
From specification to enquiry
A connection starts with the right details.
Send your material, size, rating, facing and quantity. Include a drawing reference for non-standard requirements.
Dimensions and connection data
Define Flange Standards & Dimensions as part of the complete joint. These fields identify required engineering data; they are not universal dimensions or a declaration of available sizes.
| Parameter / designation | Technical information | Selection requirement |
|---|---|---|
| Nominal size and bore | State the nominal connection size separately from the actual bore or pipe outside diameter. | A matching size label does not establish matching internal geometry. |
| Outside diameter and thickness | Identify the finished flange diameter, minimum thickness and any hub or collar projection. | Include the drawing datum and units for replacement measurements. |
| Bolt circle and holes | Record pitch-circle diameter, hole quantity, hole diameter and any special orientation. | Check against the mating flange; do not infer a bolt pattern from pressure class alone. |
| Gasket-contact surfaces | Specify face form, seating dimensions and surface finish on the assembled joint. | Include gasket designation; a visually similar surface is not evidence of compatibility. |
| Pipe-side interface | Identify weld preparation, socket, thread, collar or other attachment geometry as applicable. | Provide pipe schedule/wall thickness and the connection-specific standard. |
| Design conditions | State design pressure, minimum/maximum temperature, fluid and mechanical loads. | Pressure class is not a pressure value in bar or psi. Use the material-specific rating basis. |
Compare related options
Compare Flange Standards & Dimensions with the related forms or references below. A related product is not necessarily a permissible substitute.
| Related product / reference | Distinction | Check before selection |
|---|---|---|
| ASME B16.5 Flanges | An ASME B16.5 enquiry identifies the flange type, nominal size, class, material and facing under the specified edition. The standard name alone does not define a complete joint. | ASME B16.5 edition, flange type, NPS and class |
| ASME B16.47 Flanges | ASME B16.47 covers large-diameter steel flange requirements within its defined scope. Every enquiry must distinguish Series A from Series B. | Explicit Series A or Series B designation |
| ASME B16.47 Series A Flanges | Specify Series A explicitly when ordering a large-diameter flange to ASME B16.47. A matching nominal size does not make a Series B flange interchangeable. | ASME B16.47 edition with Series A stated |
| ASME B16.47 Series B Flanges | Series B is a separate large-diameter flange series within ASME B16.47. Confirm its complete interface before ordering replacements or mating equipment. | ASME B16.47 edition and Series B |
| ASME B16.36 Flanges | ASME B16.36 is the flange reference for orifice-flange arrangements within its scope. It does not replace the design of the differential-pressure metering system. | B16.36 edition, configuration, size, class and material |
| ASME B16.48 Line Blanks | ASME B16.48 addresses operational line blanks within its scope. Distinguish a spectacle blind, a separate spade and a ring spacer from a bolted blind flange. | Spectacle blind, spade or ring spacer |
Inspection, documents and delivery
Define acceptance requirements for Flange Standards & Dimensions in the purchase order. Required examinations and documents depend on the material, design and project specification.
| Review stage | Information to confirm | Order requirement |
|---|---|---|
| Material identity and traceability | Specification, grade, heat/lot identification and the required material certificate. | Agree documentation and marking before manufacture; visual appearance cannot verify alloy identity. |
| Dimensional verification | Critical dimensions from the selected standard or controlled drawing. | Identify inspection points, tolerances, units and drawing revision. |
| Surface and end condition | Gasket-contact surface, attachment end, edges and any coating exclusions. | State finish and visual acceptance criteria; agree protection of machined surfaces. |
| Supplementary examinations | Any specified PMI, NDE, hardness, impact, corrosion or other tests. | Define the method, sampling and acceptance criteria; tests are not automatically included. |
| Assembly compatibility | Adjoining components, weld or mechanical interface and project service conditions. | Design approval and correct assembly remain separate from a dimensional inspection report. |
| Packing and order release | Quantity, identification, surface protection, documents and delivery destination. | Agree preservation, packaging and release requirements with the order. |