Can UNS S17400 Material be Used for Hangers in Sour Service?

Introduction

This page provides an answer to an inquiry regarding the use of UNS S17400 material for hangers in a sour environment in accordance with NACE MR0175/ISO 15156-3 Table A.27.

Definition of Hangers

The inquiry raises questions about the definition of hangers and their categorization as subsurface equipment within the context of Table A.27, and whether the use of UNS S17400 material is prohibited for hangers in sour service.

Hangers as Wellhead and Christmas Tree Components

The answers provided state that hangers are commonly included in the term “”wellhead and christmas tree components”” within the context of Table A.27. The exclusion of “”bodies and bonnets”” in Table A.27 does not automatically exclude hangers.

Use of UNS S17400 Material for Hangers

The use of UNS S17400 material is acceptable for hangers in sour service, provided the environmental limits and metallurgical requirements outlined in Table A.27 are met.

Reference

This question pertains to NACE MR0175/ISO 15156-3 A.8.2, Table A.27, and the reference cited is ISO 15156 Maintenance Panel Inquiry #2005-12.

Update

The page also provides an update from April 2016 regarding NACE MR0175 2015 – Technical Circular 1 and its implications for the use.