Explore this topic

NACE SP0169, Control of External Corrosion on Underground or Submerged Metallic Piping Systems, is a standard published by the National Association of Corrosion Engineers (NACE) in order to give criteria for preventing and maintaining control over corrosion in underground or submerged metallic piping systems or other metallic underground structures. It specifically covers piping systems and other structures made of steel, stainless steel, cast iron, ductile iron, copper, and aluminum; primarily those used in the transportation of oil, gas, water, and other fluids.

At exactly 60 pages long, NACE SP0169 also includes information on several other related topics such as:

  • Why corrosion control is needed in these systems;
  • Proper design of piping systems;
  • The importance of coatings;
  • The proper criteria, design, and installation of cathodic protection systems in underground piping systems;
  • The control of interference currents.

The standard also addresses maintenance of cathodic protection systems and how to keep external corrosion control records. General costs for maintaining service, corrosion control, and corrosion itself are addressed in the Appendixes B through D. On the other hand, this standard does not cover corrosion control methods that involve the injection of chemicals into the environment around the pipe, the use of electrically conductive coatings or of non-adhered polyethylene encasement on the pipe, which are covered under NACE Publication 10A292.

This standard was originally released in January of 1996 as NACE RP0169. It has had two revisions prior to it’s current 2013 revision, one in 2002 and another one in 2007.

Understanding and abiding by this standard is important for those involved in operating and maintaining piping systems, and is vital in keeping up in designing, implementing, and maintaining proper maintenance and care procedures for underground piping systems.

Relevant Links

Topic Tools

Share this Topic

Contribute to Definition

We welcome updates to this Integripedia definition from the Inspectioneering community. Click the link below to submit any recommended changes for Inspectioneering's team of editors to review.

Contribute to Definition
Articles about NACE SP0169
November/December 2007 Inspectioneering Journal

Because of widespread interest in the proposed revision in progress to NACE International standard SP0169 (formerly RP0169), "Control of External Corrosion on Underground or Submerged Metallic Piping Systems," NACE is sponsoring an...

Partner Content

Equity Engineering Practices® (EEPs) are a collection of design and maintenance focused corporate standards that include >850 engineering standards, and >300 piping classes. Enhance your mechanical integrity programs, improve equipment...

    Inspectioneering Journal

    Explore over 20 years of articles written by our team of subject matter experts.

    Company Directory

    Find relevant products, services, and technologies.

    Training Solutions

    Improve your skills in key mechanical integrity subjects.

    Case Studies

    Learn from the experience of others in the industry.


    Inspectioneering's index of mechanical integrity topics – built by you.

    Industry News

    Stay up-to-date with the latest inspection and asset integrity management news.


    Read short articles and insights authored by industry experts.

    Expert Interviews

    Inspectioneering's archive of interviews with industry subject matter experts.

    Event Calendar

    Find upcoming conferences, training sessions, online events, and more.


    Downloadable eBooks, Asset Intelligence Reports, checklists, white papers, and more.

    Videos & Webinars

    Watch educational and informative videos directly related to your profession.


    Commonly used asset integrity management and inspection acronyms.