Long Radius Pipe Bend technical overview.
Long Radius Pipe Bend from JINYI is presented in the NPS 4 · 90° · 3D bend configuration. Use the dimension schedule, connection details and inspection requirements below when comparing this product with your pipework or equipment drawing.
On this page
What is a long radius pipe bend?
A long radius pipe bend changes the pipe direction over a specified curved length and may include straight tangent sections. The bend is defined by its radius, angle and end geometry.
Key dimensions and installation fit
Bend angle, centreline radius and end orientation determine the route and installation envelope. Radius is measured to the pipe centreline, while the outside diameter describes the tube or pipe section. For a return bend, compare the parallel-leg spacing as well as the back-to-face dimension; for a coil, also state turn count, pitch and end positions. For a return with defined straight legs, compare the U-shaped pipe bend and check the required connection spacing.
How to specify the long radius pipe bend
Select the pipe material and wall thickness for the service before agreeing the formed geometry. Bending or segmented fabrication can change the wall distribution and cross-sectional shape. A longer radius changes the envelope and bend geometry; it does not by itself establish a pressure rating or a finished-wall acceptance limit.
Technical data for the long radius pipe bend
| Nominal size | 4 in / DN100 |
|---|---|
| Pipe outside diameter | 114.3 mm |
| Bend angle | 90° |
| Radius ratio | 3D |
| Centreline radius | 304.8 mm |
| Centreline arc length | 478.8 mm |
Sizes and dimensional requirements
The dimensional schedule identifies the illustrated configuration. Compare each value with the mating pipe, equipment or support drawing. A nominal designation does not replace the actual connection diameter, installation envelope or mounting detail. The choices above let you include a different configuration with your quotation request.
Dimensions and tolerance schedule
| Off-angle Q | 0.8 mm maximum |
|---|---|
| Off-plane P | 1.5 mm maximum |
Inspection, standards and documentation
Inspect the completed radius, bend plane, end orientation and relevant centre dimensions. State permissible ovality and finished-wall requirements on the controlled drawing. For segmented elbows, include segment layout and weld inspection; for coiled tube, include the required coil diameter, pitch and tangent lengths.
State the required product standard and edition, material records and inspection acceptance criteria before ordering. Where pressure, temperature, movement or load are relevant, provide the operating and test conditions together. Document requirements should identify the actual component and drawing revision; a general certificate does not replace a dimensional or material record for the ordered item. For production steps and inspection considerations, see flanges and fittings manufacturing.
Where the long radius pipe bend is used
- Pipe routing. Use the angle, centreline radius and end orientation to establish the route.
- Equipment connections. Check tangent lengths and clearance around the installation envelope.
- Custom fabrication. Provide a drawing showing the bend plane, wall specification and any coil or return geometry.
How to order a long radius pipe bend
Select the required options and send the quantity, destination, material and controlled drawing to JINYI. Include changed dimensions, mating details, finish, marking and packing requirements. The quotation defines the final configuration, inspection scope and delivery terms so the component can be checked against the intended installation.
Quantity prices and order preparation
| 1–49 pcs | US$0.90 per piece |
|---|---|
| 50–199 pcs | US$0.86 per piece |
| 200 pcs and above | US$0.81 per piece |
Freight and taxes are quoted separately. A different material, size or drawing can change the price and delivery requirements. Confirm the agreed specification before manufacture, and keep the drawing revision, selected options and ordered quantity together in the enquiry.
Other JINYI products worth comparing
Compare 90 degree pipe elbow, 45 degree pipe elbow, or review the pipe fittings and elbows catalog for other connection and configuration choices.
Request a custom long radius pipe bend quotation from JINYI with the drawing and quantity required for your project.
Long Radius Pipe Bend selection and quotation checklist
The longer radius changes the space required for the route. Specify the centreline radius, bend angle and any straight tangents rather than selecting by nominal size alone. Use the photographed product form to identify the arrangement, then use the controlled drawing to define what will be supplied. Similar-looking components can have different end details, load paths or maintenance requirements.
Long Radius Pipe Bend dimensions and tolerances
The first comparison for this long radius pipe bend is bend radius and tangent lengths. Mark the dimensions that control mating, alignment and installation space on the enquiry drawing. Give units for every value and identify the datum from which it is measured. If a dimension is critical, specify its individual tolerance and measurement method rather than relying on a general tolerance note.
The current schedule identifies nominal size: 4 in / DN100; pipe outside diameter: 114.3 mm; bend angle: 90°. Read these entries together with the configuration and tolerance tables above. Reference or example values describe the displayed arrangement; the approved JINYI quotation and drawing define the ordered component. A different interface, material or service condition needs a fresh comparison.
Prepare the material and interface information
For a long radius pipe bend enquiry, identify the required material designation and supplied condition. Describe the mating components, attachment method and environment. Include the operating temperature and any relevant pressure, movement or structural load. These inputs should describe the actual installation, including changes between normal operation, start-up and maintenance where applicable.
Specify coatings, surface finish and marking separately from the base material. If traceability is needed, identify the record required and how it must correspond to the delivered component. Agree whether inspection covers dimensions, material documentation, welds or functional testing; these are different checks with different acceptance criteria.
Custom long radius pipe bend quotation
Attach the latest drawing revision, required quantity and delivery destination when contacting JINYI. Highlight departures from the illustrated arrangement, including changed dimensions, connections, finish and packing. For repeat orders, reference the approved configuration and list changes explicitly so an earlier drawing is not assumed to remain current.
The three price tiers above organise the displayed quantity bands. Compare quotes using the same drawing, material, inspection scope and unit of supply. A piece, a segment and a complete assembly are different units where applicable. Confirm freight, taxes, documentation and delivery terms with the final quotation instead of inferring them from the displayed unit price.
Compare related component arrangements
Evaluate this pipe bend by its actual bend radius and tangent lengths and the required radius bend arrangement. The photographs below show separate JINYI products for comparison. They are linked to their own technical pages and are not additional gallery views of this long radius pipe bend.
| Photo | Related product | Selection detail |
|---|---|---|
 | 90 Degree Pipe Elbow | Centreline radius and wall schedule. Compare this separate product when the drawing requires its particular arrangement. |
 | Segmented Pipe Elbow | Segment layout and weld positions. Compare this separate product when the drawing requires its particular arrangement. |
 | U-Shaped Pipe Bend | Return angle and parallel-leg spacing. Compare this separate product when the drawing requires its particular arrangement. |
Questions to resolve before ordering
Which dimensions need checking first?
Start with bend radius and tangent lengths and the mating or mounting detail. Check nominal designations against measured dimensions, then review the installation envelope. Photographs help identify the form; the drawing provides the dimensional basis for acceptance.
What should the quotation include?
A long radius pipe bend quotation should identify the configuration, drawing revision, material, quantity, price basis and agreed inspection records. Keep these details together with the approved order so receiving inspection can compare the delivered product with the specified component.
Independent terminology reference
ASME butt weld fitting standard scope provides an independent reference for component terminology. Use the specified standard and edition where required by the project. This link does not establish JINYI certification, product approval or interchangeability with another manufacturer.
- 4 in / DN100
- Nominal size
- 114.3 mm
- Pipe outside diameter
- 0.8 mm maximum
- Tolerance
- 3
- Quantity tiers
- Centreline geometry — Radius, bend angle and tangent lengths jointly define the envelope.
- Finished wall — Forming may change wall distribution and cross-sectional shape.
- Assembly control — State end orientation and any out-of-plane rotation.
At a glance
- Product
- Long Radius Pipe Bend
- Configuration
- NPS 4 · 90° · 3D bend
- Nominal size
- 4 in / DN100
- Pipe outside diameter
- 114.3 mm
- Bend angle
- 90°
Dimensions and technical specification
| Parameter | Specification |
|---|---|
| Nominal size | 4 in / DN100 |
| Pipe outside diameter | 114.3 mm |
| Bend angle | 90° |
| Radius ratio | 3D |
| Centreline radius | 304.8 mm |
| Centreline arc length | 478.8 mm |
