Understanding the Separation of Tubing and Subsurface Equipment in NACE MR0175/ISO 15156-3

Introduction

This page provides an answer to an inquiry seeking clarification on the separation of tubing and subsurface equipment in Tables A.19 and A.20 of NACE MR0175/ISO 15156-3, and the recommendation of certain materials for subsurface equipment under certain conditions.

The Role of Industry Experts in Material Selection

The answer provided acknowledges the experience of the oil industry and its experts in the use of materials in sour service over many years, which informs the separation of materials into Tables A.19, A.20, and A.21. The differences in the acceptability of different materials for tubing and subsurface equipment may reflect differences in the availability of product forms manufactured from these materials.

Recommendation of Materials for Subsurface Equipment

Regarding the recommendation of certain materials for subsurface equipment under certain conditions, the answer notes that ISO 11960 L80 type 13Cr is acceptable for other subsurface equipment (other than tubing) if it fully meets the applicable material requirements. Successful laboratory testing or field experience informs the data presented in these tables.

Conclusion

In conclusion, this answer clarifies the separation of tubing and subsurface equipment in NACE MR0175/ISO 15156-3 and the recommendation of certain materials for subsurface equipment. The reference cited is ISO 15156 Maintenance Panel Inquiry #2005-22.