• LinkedIn
  • Facebook
  • Twitter
  •   office@oilandgascorrosion.com        +44 (0) 114 4000850

Oil & Gas Corrosion

  • Home
  • About Us
  • Services
  • Case Studies
  • NACE MR0175
  • FAQs
  • Contact Us
  • alloyselect

What are the NACE MR0175 limits for alloy 718 (UNS N07718)?

6th April 2016

Viewed 2212 Times

Question

Our question relates to ISO 15156-3, Table A.32: How should the table be interpreted in terms of the maximum allowable temperature for applications with less than 30 psi partial pressure of H2S? For example, in its current layout the table prohibits the use of UNS N07718 at temperatures higher than 450°F at any H2S pressure below 30 psi.

Answer:

ISO 15156-3, Table A.32 does not qualify UNS N07718 for use at higher temperatures than 450°F.
The limits on temperature, H2S, Cl-, pH, and sulfur defined in some of the tables of ISO 15156-3, Annex A apply collectively and reflect the knowledge available, usually from laboratory tests, at the time the standard was published. There were no data available related to the use of UNS N07718 at any temperature higher than 450°F.

ISO 15156 allows the qualification and use of materials, to an equipment user’s requirements, outside the limits stated in the tables. (See ISO 15156-3, Figure B.1, Column 2.)

A qualification to define an alternative temperature limit for UNS N07718 for a partial pressure of H2S less than 30 psi must be carried out in accordance with ISO 15156-3, Annex B.

This question is in relation to NACE MR0175/ISO 15156-3 A.9.2, Table A.32

Reference: ISO 15156 Maintenance Panel Inquiry #2005-20

Our corrosion consultants and oilfield metallurgists can help you evaluate the production environment and validate your alloy 718 selection.

UPDATE 2018-06-04: A recent Technical Circular brings relevant updates on NACE MR0175 including Inconel 718: https://oilandgascorrosion.com/nace-mr0175-iso-15156-technical-circulars-for-part-2-and-3-published-2018-06-01/

We are here to help you, talk to our team today!

  Email Us

USA toll-free

Live Chat

Contact us to find out more. In the US call our toll-free number 877.399.1010 and in the UK call 0114 4000850; or use our webchat for online materials and corrosion support.

Oil and Gas Corrosion Ltd is an independent materials and corrosion consultancy for the Oil and Gas industry. Oil and Gas Corrosion Ltd is under the guidance of Ivan Gutierrez. Ivan has more than 20 years’ experience in materials and corrosion and is a member of the National Association of Corrosion Engineers (NACE), a professional member of the Institute of Corrosion (MICorr) and the Society of Petroleum Engineers (SPE). He is a recognised materials and corrosion authority recognised as a Great Britain national expert member of the British Standard Institution committee PSE/17/67/7 “Corrosion Resistant Materials” and internationally as a member of Task Group 299 on the Oversight of Maintenance Panel for NACE MR0175 / ISO 15156. “Materials for use in H2S-containing environments in oil and gas production”, IOGP 15156 Committe (ISO/TC 67/WG 7 “Corrosion Resistant Materials”. Ivan is also a member of ISO/TC 67/WG 8 Materials, corrosion control, welding and jointing, and non-destructive examination (NDE) which is responsible for standards such as ISO 21457 “Materials selection and corrosion control for oil and gas production systems”. Oil & Gas Corrosion has headquarters in the United Kingdom providing services to clients across the globe.

 

Was this answer helpful ? Yes / No

Blog

Consultoría Técnica para la norma NACE MR0175 en español

3rd February 2019

...
READ

What is the difference between NACE MR0175 and NACE MR0103?

1st February 2019

...
READ

Users of BP Cassandra excel file have migrated to cloud solutions.

23rd January 2019

...
READ

How to use NORSOK M-506 Edition 3: 2017 to calculate corrosion rate?

4th January 2019

...
READ

Environmentally Assisted Cracking in Upstream Oilfield

1st August 2018

...
READ

Artificial Intelligence in materials selection of oil and gas assets.

31st July 2018

...
READ

View BLOG ➤

Tweets

  • What is the NACE MR0175 heat treatment? Ask our team of expert metallurgists https://t.co/4EhAAREMwJ, 9 hours ago
  • NACE MR0175 and the requirements for HSC, GHSC and SSC - We have the Technical Authority in Materials a... https://t.co/9F7IFUWjeY, 20 hours ago
  • NACE MR0175 and surface treatments to prevent SSC - Ask our corrosion consultants and metallurgists https://t.co/tzwxFYMQkD, Feb 16
Follow @oilgascorrosion ➤

Oil Prices



Oil and Gas Corrosion Ltd.
5 Smithfield
Sheffield
S3 7AR
United Kingdom
+44 (0) 114 4000850
US toll-free 877-399-1010

Privacy Policy   |   Website Terms & Conditions


© 2019 Oil & Gas Corrosion. Designed by Hunter Bevan..,.

try the online software for materials selection
  • try the online software for materials selection

  • alloyselect helps you select materials for sour service

By continuing to use the site, you agree to the use of cookies. more info

The cookie settings on this website are set to "allow cookies" to give you the best browsing experience possible. If you continue to use this website without changing your cookie settings or you click "Accept" below then you are consenting to this.

Close