Branch connections
Nipo Flanges
A Nipo flange is a flanged branch-outlet form with a nipple-like extended neck. Projection and the run-pipe attachment must be defined as part of the complete branch.
Branch connections
Weldo Flanges
A Weldo flange combines a flanged branch connection with a weld-on outlet form at the run pipe. The branch-to-run interface is a defining part of the requirement.
Specify the run pipe and branch independently, together with the outlet contour, reinforcement and branch projection. The flanged end and the attachment to the run pipe have different design checks. A flange-standard designation alone does not qualify the complete branch connection.
Compare flange typesRun-pipe fit and reinforcement
Provide run outside diameter, wall thickness and branch orientation. The outlet contour, reinforcement and attachment weld must be reviewed under the applicable piping design requirements.
Distinguish Weldo from Nipo
Commercial naming can vary between suppliers. This enquiry uses Weldo for the compact outlet-style form; specify a controlled profile drawing rather than relying on the name to establish the offered geometry.
Dimensions and connection data
Define Weldo Flanges 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 Weldo Flanges with the related forms or references below. A related product is not necessarily a permissible substitute.
| Related product / reference | Distinction | Check before selection |
|---|---|---|
| Nipo Flanges | A Nipo flange is a flanged branch-outlet form with a nipple-like extended neck. Projection and the run-pipe attachment must be defined as part of the complete branch. | Pipe outside diameter, wall and attachment contour |
| Long Weld Neck Flanges | An extended neck combines a flanged connection with a longer nozzle section. Neck length, bore and end preparation must be specified for the intended equipment connection. | Provide required projection, wall and bore |
| Weld Neck Flanges | A tapered hub carries the connection from the flange body to a butt-welded pipe end. The pipe bore and wall thickness are important parts of the flange specification. | Butt-weld end; specify pipe schedule and bore |
Inspection, documents and delivery
Define acceptance requirements for Weldo Flanges 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. |
Specification checklist
Define your weldo flanges
Availability, dimensions and pressure-temperature suitability are confirmed against your complete enquiry.
| Item | Requirement |
|---|---|
| Run pipe | Outside diameter, schedule, material and orientation |
| Branch | Nominal size, bore, projection and flange interface |
| Attachment | Outlet contour, weld preparation and reinforcement basis |
| Inspection | Required weld examination, material records and acceptance criteria |
| Material & quantity | Exact material designation, quantity and required certification or inspection documents |
Application context
Where this form is considered
- Flanged instrument or process branches
- Compact weld-on run-pipe outlets
- Branch assemblies defined by piping drawings
Related connections
Compare other flange forms
Welded connections
Long Weld Neck Flanges
An extended neck combines a flanged connection with a longer nozzle section. Neck length, bore and end preparation must be specified for the intended equipment connection.
Welded connections
Weld Neck Flanges
A tapered hub carries the connection from the flange body to a butt-welded pipe end. The pipe bore and wall thickness are important parts of the flange specification.