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Evaluation of the Effects of Natural Gas Contaminants on Corrosion in Compressed Natural Gas Storage Systems Phase II - January 1989

Fred F. Lyle, Jr.

In the pdf format this document has 78 pages and is 2.21MB.

Table of Contents

ABSTRACT

i
EXECUTIVE SUMMARY ii
LIST OF FIGURES ix
LIST OF TABLES x
 
SECTION 1: INTRODUCTION
  Background 1
Objectives 2
Scope of Work 2
  Task 1 - Industry Contacts and Literature Review 3
Task Z - Experimental Program 3
Task 3 - Metallurgical Evaluation of Used CNG Cylinders 4
Task 4 - Analyses 4
 
SECTION 2: SUMMARY OF PHASE 1 PROGRAM
  Task 1 - Industry Contacts and Literature Review 6
Task e - Experimental Program 8
  Materials and Procedures 8
  Gases 8
Alloys 9
Test Methods 9
Test Conditions 10
Test Results 11
  Stress Corrosion Cracking 12
General Corrosion 12
Task 3 - Evaluation of Used CNG Cylinders 16
Findings of the Phase I Program 19
 
SECTION 3: PHASE II PROGRAM
  Objectives 21
Corrosion Test Program 22
  Background 22
Test Materials, Conditions, and Procedures 23
Stress Corrosion Cracking Test results 29
  4130X Steel 29
  Baseline Test 29
H2S Effects 32
CO2 Effects 36
Combined H2S and CO2 Effects 37
15830 Steel 38
  H2S Effects 38
CO2 Effects 38
Combined H2S and CO2 Effects 42
General Corrosion Tests 42
  4130X Steel 45
15B30 Steel 45
Findings of Phase II Corrosion Test Reults 46
  Stress Corrosion Cracking Tests 46
  4130X Steel 46
15B30 Steel 47
General Corrosion 47
 
SECTION 4: CONCLUSIONS AND RECOMMENDATIONS 48
  Conclusions 48
Recommendations 48
  Gas-Quality Standard 50
Other Recommendations 53
  Use of Normalized Steels in CNG Cylinders 53
Additional Research 54
  Corrosion Fatigue 54
Corrosion and Stress Corrosion Cracking 54
 
SECTION 5: REFERENCES 55