# 90° long radius elbow

> Butt-weld 90 degree long radius elbows to ASME B16.9 in ASTM A234 WPB and A403, and what a fittings request needs to be quoted, by NPS and schedule.

URL: https://jjprojectsok.com/products/steel-structural/elbow-90-lr  
Español: https://jjprojectsok.com/es/products/steel-structural/elbow-90-lr  
Updated: 2026-10-16

Butt-weld elbow with a centerline radius of 1.5 times the NPS, for gentle direction changes.

**In short:** Butt-weld elbow with a centerline radius of 1.5 times the NPS, for gentle direction changes. JJ Projects sources it to the specification the buyer names. Typical reference, standards: ASME B16.9; weld ends per ASME B16.25.

## Specification references

- Standards: ASME B16.9; weld ends per ASME B16.25
- Materials: ASTM A234 WPB (carbon), A403 (stainless)
- End connections: Beveled ends for butt welding
- Size: NPS and wall schedule to match the pipe

> Typical references only. The governing specification is the one on your purchase order or datasheet.

## Typical uses

- Direction changes in process, utility and pipeline piping
- Pump suction and discharge runs and pipe rack turns
- Lines where low pressure drop matters, since a long radius turn is gentler than a short radius one
- Stainless and alloy piping in corrosive service

## What to include in a request

A request with these details can be quoted without a round of questions. Send what you have and we will ask for the rest.

1. NPS and wall thickness or schedule, matched to the pipe it joins
2. Angle and radius: 90 degrees, long radius (1.5 x NPS), or other angle or radius if different
3. Material and grade, for example ASTM A234 WPB for carbon steel or A403 WP316L for stainless
4. Seamless or welded construction, if the specification allows both
5. End preparation: bevel to ASME B16.25 unless stated otherwise
6. Quantity
7. Documents: material test report and any examination or marking requirement

[Request this item](https://jjprojectsok.com/request-a-quote?item=elbow-90-lr)

## Questions

### What is the difference between a long radius and a short radius elbow?

A long radius elbow turns on a centerline radius of 1.5 times the NPS. A short radius elbow turns on a radius equal to the NPS. Long radius is the common choice because it causes less pressure drop; short radius is used where space is tight.

### Why must the elbow wall match the pipe?

The ends are beveled for butt welding to the pipe. If the wall thickness of the fitting and the pipe differ much, the weld joint has a step that needs transition rules under the piping code. Stating the schedule avoids that.

### What does WPB mean?

WPB is a grade designation in ASTM A234 for carbon steel butt-weld fittings, used with carbon steel pipe such as A106 Grade B. The grade must be compatible with the pipe material.

## Related items

- [Equal tee](https://jjprojectsok.com/products/steel-structural/equal-tee): Butt-weld equal tees to ASME B16.9 in ASTM A234 WPB and A403, sized by NPS and schedule, and what to include in a request for equal tees so it can be quoted.
- [Concentric reducer](https://jjprojectsok.com/products/steel-structural/concentric-reducer): Butt-weld concentric reducers to ASME B16.9 in ASTM A234 WPB and A403, joining two pipe sizes on one centerline, with the request details needed to quote them.
- [Seamless pipe](https://jjprojectsok.com/products/steel-structural/seamless-pipe): Seamless carbon and stainless pipe by NPS and schedule, sourced to ASTM A106, A312 and API 5L, with the details a pipe request should carry.
- [Weld neck flange](https://jjprojectsok.com/products/steel-structural/flange-weld-neck): Forged weld neck flanges to ASME B16.5 and B16.47 in A105, A350 LF2 and A182 grades, and what a flange request needs to state to be quoted properly.

## Guides

- [Pipe schedules: NPS, OD and wall thickness](https://jjprojectsok.com/knowledge/pipe-schedules-explained): NPS is a label, not a measurement. Learn how pipe schedule sets wall thickness under ASME B36.10M and B36.19M, with OD and wall tables for NPS 2, 4, 6 and 8.
- [Material test reports (MTRs) and EN 10204](https://jjprojectsok.com/knowledge/material-test-reports): What a material test report contains, how EN 10204 types 2.1, 2.2, 3.1 and 3.2 differ, what heat numbers mean, and what to check against the purchase order.

[All steel and structural](https://jjprojectsok.com/products/steel-structural)