Circulating Sub
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The circulating sub is designed to circulate the flow of drilling fluid while the drilling rig is running casing or for pumping mud from the rotary hose directly to the casing of the downhole. The connection of the circulating sub can use a casing thread or union thread.
Specifications| connection type | I.D. | overall length | |
| male connection | casing connection | ||
| NC38 | 5" BTC | 57 | 500 |
| 5" LTC | |||
| 5" STC | |||
| NC38 | 5 1/2" BTC | 57 | 580 |
| 5 1/2" LTC | |||
| 5 1/2" STC | |||
| NC50 | 7" BTC | 71 | 600 |
| 7" LTC | |||
| 7" STC | |||
| NC50 | 9 5/8" BTC | 71 | 620 |
| 9 5/8" LTC | |||
| 9 5/8" STC | |||
| NC50 | 10 3/4" BTC | 71 | 670 |
| 10 3/4" LTC | |||
| 10 3/4" STC | |||
| NC50 | 13 3/8" BTC | 71 | 670 |
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