---
title: Case Study, SA789 Duplex U-Bend Bundles for a Motiva Chemical Plant Retube | Ameritube
description: "Ameritube supported Metalforms Ltd. with 14 SA789 S31803/S32205 duplex U-bend bundles for a Motiva chemical plant retube: bending, annealing, A923 testing, PMI, hydrostatic and dimensional records, and a complete quality package."
---

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# Fourteen duplex U-bend bundles, one demanding spec.

Metalforms Ltd. needed 14 duplex stainless U-bend bundles for a Motiva chemical plant retube, with difficult testing, bending, and annealing requirements. Ameritube managed raw material traceability, supplier qualification, bending, heat treatment, inspection, third-party testing, and the final quality documentation.

Project

14U-bend bundles

S31803 / S32205SA789 duplex stainless

A923Method A and C, plus ferric chloride corrosion test

5record sets: A923, PMI, dimensional, hydrostatic, heat treatment

## Why this project mattered

The bundle design required tight control over bend geometry, heat treatment, hardness, corrosion resistance, and nondestructive testing. Ameritube managed the commercial and technical supply chain and delivered a completed package ready for customer review and plant installation planning.

## What was managed

| Requirement | Execution and documentation |
| --- | --- |
| Material | SA789 S31803 / S32205 duplex stainless tubing |
| Bending and geometry | U-bend bundles produced to the bend schedule and dimensional requirements |
| Heat treatment | Solution annealing, and electric resistance stress relief of selected U-bends and tangent lengths |
| NDE and pressure testing | Eddy current per SA-789, hydrostatic records |
| Metallurgical testing | ASTM A923 Method A and C, ferric chloride corrosion test, tensile, flaring, flattening, and hardness checks |
| Documentation | Raw and final MTRs, PMI, dimensional inspection, heat treatment records, and the assembled quality package |

## The result

Fourteen bundles delivered with a complete quality package: A923 and corrosion results, PMI, dimensional, hydrostatic, and heat treatment records, ready for the customer's review and the plant's installation planning.

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### Downloads

- [SA789 duplex U-bend case study](https://ameritube.net/hubfs/new-site/case-studies/sa789-duplex-u-bends-motiva.pdf?hsLang=en)PDF

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