Shell and Seat test for ball valves are carried out as per the following sequence for ball valves in accordance with API 6D.
| TEST | DURATION | PRESSURE APPLIED | PART | DESCRIPTION |
|---|---|---|---|---|
| HYDRAULIC | DN 0.25"-4"- 2 min DN 6"-10"- 5 min DN12"-18"- 15 min DN 20"-60"- 30 min |
A. 150% of the max pressure rating B. 150% of the max pressure rating C. 150% of the max pressure rating |
 |
Shell hydrostatic test is carried out with half-opened valve |
| HYDRAULIC | 5 min | A. Atmospheric B. Atmospheric C. 110% of the max pressure rating |
 |
Seat seal test at"C"side towards body cavity "B" |
| HYDRAULIC | 5 min | A. 110% of the max pressure rating B. Atmospheric C. Atmospheric |
 |
Seat seal test at "A" side towards body cavity"B" |
| AIR | 5 min | A. Atmospheric B. Atmospheric C. 80 psig (5.5bars) |
 |
Seat air seal test at "C" side towards body cavity "B" |
| AIR | 5 min | A. 80 psig (5.5bars) B. Atmospheric C. Atmospheric |
 |
Seat air seal test at "A" side towards body cavity"B" |