Variable Bore Rams
Tool Description:
Black Gold Rental Tools™ offers Variable Bore Ram Rubbers (“VBR”) which are designed to seal around a variety of pipe sizes. We also provide the “VBR” Ram Block in both 11″ and 13-5/8″ sizes to fit Type U Blowout Preventers and LWS.
Type U: “The Cameron U Type VBR finger inserts are designed to rotates as the hydraulic pressure is applied and the ram blocks begin to close allowing the ram rubber to seal around a variety of pipe sizes and eliminating changing ram rubbers each time you change pipe sizes improving operational efficiency and certainty during drilling and production.” — Cameron
LWS: “On the Shaffer type LWS rams, the locking device is actuated automatically whenever the ram is closed. This is called the ‘Posilock’, system and uses segments that move out radially from the ram piston and lock into a groove in the circumference of the opening cylinder whenever the ram is closed. When hydraulic closing pressure is applied, the complete piston assembly moves inward and pushes the ram toward the wellbore. With the ram closed, the closing pressure then forces a locking piston inside the main piston to move further inwards and force out the segments. A spring holds the locking piston in this position so that the segments are kept locked in the groove even if closing pressure is lost. When hydraulic opening pressure is applied, the locking cone is forced outward, and this allows the locking segments to retract back into the main piston which is then free to move outwards and open the rams.” — Shaffer
Shaffer and Cameron VBRs are manufactured in accordance with the American Petroleum Institute (API) specification 6A (current edition) and the National Association of Corrosion Engineers (NACE) document NACE Standard MR 0175. VBRs can also be manufactured in accordance with the API specification 16A.
Variable Bore Rams
| Diameter | Pressure Rating | Type x VBR | Size | Additional Info |
|---|---|---|---|---|
| 13 ⅝” | 3M | Cameron Type U | 4 1/2″ X 7″ | Set of 2 |
| 13 ⅝” | 5M | Cameron Type U | 4 1/2″ X 7″ | Set of 2 |
| 13 ⅝” | 10M | Cameron Type U | 4 1/2″ X 7″ | Set of 2 |
| 13 ⅝” | 3M | Cameron Type U | 3 1/2″ X 5 1/2″ | Set of 2 |
| 13 ⅝” | 5M | Cameron Type U | 3 1/2″ X 5 1/2″ | Set of 2 |
| 13 ⅝” | 10M | Cameron Type U | 3 1/2″ X 5 1/2″ | Set of 2 |
| 11″ | 10M | Shaffer Type 75 SL | 3 1/2″ X 5 1/2″ | Set of 2 |
| 11″ | 5M | Shaffer Type LWS | 2 7/8″ X 5″ | Set of 2 |
| 11″ | 3M | Cameron Type U | 2 7/8″ X 5″ | Set of 2 |
| 11″ | 5M | Cameron Type U | 2 7/8″ X 5″ | Set of 2 |
| 11″ | 10M | Cameron Type U | 3 1/2″ X 5 1/2″ | Set of 2 |
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Our Locations
South Texas/Corporate Office
West Texas Office
Our Locations
South TX/Corporate Office
West TX Office