Drilling spool is designed to connect the BOP and wellhead, both side outlets of spool can be connected with valves or manifold to prevent blowout. All drilling spools are designed and manufactured as per API Spec 16A, conforming to NACE MR 0175 standard for anti- H2S. As per connection method, both Flanged spool and studded spool are available.
| Drill Spool Model | FS18-35 | FS18-70 | FS18-105 | FS28-35 | FS28-70 | FS28-105 | FS35-21 | FS35-35 | FS35-70 | FS35-105 | FS53-21 | FS53-21 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nominal Diameter (mm) | Φ185 | Φ185 | 180 | 280 | Φ280 | 280 | Φ346 | Φ346 | Φ346 | Φ346 | Φ530 | Φ540 |
| Working Pressure (MPa) | 35 | 70 | 105 | 35 | 70 | 105 | 21 | 35 | 70 | 105 | 21 | 14 |
| Intensive Pressure (MPa) | 70 | 105 | 105 | 70 | 105 | 105 | / | 70 | 105 | 105 | / | / |
| By-pass Diameter（mm | Φ103 | Φ103/Φ78 | Φ103/Φ78 | Φ103 | Φ103/Φ78 | Φ103/Φ78 | / | Φ103 | Φ103 Φ78 | Φ103 Φ78 | / | / |
| Top and Bottom Connection Flange | API, 6B 1835 R46 | API 6BX 1870 BX156 | API 6BX 18105 BX156 | API, 6B 1835 R46 | API 6BX18105 BX156 | API 6BX18－105 BX156 | / | API, 6B1835 R46 | API 6BX 18－105 BX156 | API 6BX 18105 BX156 | / | / |
