TEST AND INSPECTION PER: 01-SAMSS-016 & NACE TM0284-2003.TEST AND INSPECTION PER: 01-SAMSS-016 & NACE TM0284-2003s
HIC Testing: Pressure Vessel Steels and storage tanks
Pre-Fabrication/Production Requirements |
Specification Details / Notes: |
| Documentation Required for Bid Evaluation | 01-SAMSS-016, Appendix “A”. |
| The steel mill HIC test certificate | 01-SAMSS-016, Para.1.2.2, 1.2.3 & 1.2.4 |
| HIC Laboratory Approval | The Chairman of the Materials and Corrosion Control Standards Committee shall approve HIC Test Laboratories (01-SAMSS-016, Section 6). |
In process inspection & test requirement |
Specification Details / Notes: |
| Test Specimen selection | 01-SAMSS-016, Para. 7.1 & Appendix “B”, Section 5. |
| Test Specimen preparation | NACE Para. 5.2, 4.3 & 01-SAMSS-016 Figure 3: Inspector to verify sample and mark for trace ability. |
| Cleaning of Samples | NACE Para. 4.4: Degreasing and rinsing. |
| Test Solution and Reagents | NACE Section 2; 01-SAMSS-016 Paragraphs 5, 6.3 and 6.4,
Appendix “B”, Section 2, Figure 3. |
| Testing Apparatus | NACE Section 3 & Figure 1 and 01-SAMSS-016, Para. 6.3, Figure 3, Appendix “B”; Para. B.2.3. (see the note 3) |
| Control Sample | Control Sample shall be used to validate the test.
01-SAMMS-016, Para 6.2 & Appendix “B”; (see note 4) |
| Specimen Orientation in Test Bath | NACE Section 6 & Figure 10: Placed in test vessel with wide effaces vertical and separated from the other samples by 6 mm on all sides. |
| Ratio of volume of Solution to Surface Area of Specimen | NACE Para. 6.1: Shall be a minimum of 3 ml per cm2. |
| Nitrogen purge and flow rate | NACE Para. 6.2.1 & 6.2.2: Purged for one hour, at a rate of at least 100 ml per minute, per liter of test solution. |
| H2S Purge and flow rate | NACE Para. 6.2.1 & 6.2.3: Bubbled through the test solution entered from the bottom of the bath. (see note 5) |
| Temperature and PH | NACE Para. 6.3 & 6.4: temperature of the test solution shall be 25#3#C. pH as per the requirements associated with solution A. |
| H2S concentration (Iodometric Titration Method) | NACE Para. 6.2.3 Appendix C; 01-SAMSS-016, Para. . 6.4: As a minimum shall be 2,300 ppm. |
| Test Duration | NACE Para. 6.4: Test duration shall be 96 hours. The test time shall begin immediately upon completion of the initial 60-minite H2S introduction period. |
Final inspection & test requirements |
Specification Details / Notes: |
| Evaluation and Acceptance Criteria of Test Specifications | 01-SAMSS-016, Para. 7, & Appendix “B” Section 7, figure 2. |
| Reporting Test Results | 01-SAMSS016, Appendix “B”, Section 8. |
Additional/Supplemental Requirements |
Specification Details / Notes: |
| Safety Requirements | NACE TM0284 Appendix “A”. |
| Safety Procedure and Work Instructions | see note 6 |
Notes:
(1) May only be waived by the responsible Saudi Aramco, ASC, and AOC Inspection Offices.
(2) See form IR000003 for instructions on using this form.
(3) H2S in gas Cylinders is the only acceptable practice for generating H2S (Purity shall be 99.5% minimum). The used nitrogen shall be minimum
industrial grade, 99.5% pure.
(4) The control samples shall be provided by the manufacturer / vendor and demonstrate a CLR of at least 20% in solution “A” for the test parameters
to be considered acceptable, only after this shall the actual specimens be evaluated.
(5) The rate of bubbling shall be at least 200 ml per minute, per liter of test solution for at least 60 minutes; thereafter a positive pressure maintained
for the reminder of the test of H2S gas.
(6)Adequate ventilation, permanent H2S monitors located by the entry door and inside near the test setup (near ground level), alarm system with
flashing light and horn, gas masks with either oxygen or proper cartridges, and safe disposal of spent solutions and chemicals.