Tool Insert Retrievable

The HRV choke, which is our third generation of insert-retrievable chokes, is qualified for water depths up to 18000 feet (5500 m). It consists of a right-angle body with an insert module that can be installed or retrieved by a cable-deployed running tool with the assistance of a remotely operated vehicle (ROV). The choke insert module (CIM) includes all of the valve internals, the actuator, and an ROV-operated clamp connector, which secures the insert to the valve body. Metal-to-metal seals are used at all critical sealing areas including a double-tapered metal bonnet seal. This product is available in a number of sizes and pressure/temperature ranges.
The insert clamp connector (ICC) is available with either horizontal or vertical ROV access in several positions relative to the valve piping. This clamp system is designed so that, should it fail, the connector stem can be cut by an ROV-mounted tool thereby allowing emergency release of the insert module. Because this clamp connector is part of the insert module, it can then be repaired once retrieved to the surface.

The HRV choke
comes standard with our model SL hydraulic rotary stepping actuator, which features pressure/volume compensation and a piston design that balances the back-pressure due to hydraulic head. This design also ensures that there is no volume change within the actuator housing throughout the stepping cycle. The hydraulic couplers for the actuator are built into the valve body and bonnet and are connected and disconnected automatically during installation and retrieval of the insert module. The actuator comes with a high-visibility local position indicator. As well, an optional linear variable differential transformer (LVDT) is available to directly measure the position of the valve stem for accurate electrical feedback of the choke position. The electrical leads for the LVDT are terminated in a bulkhead-mounted ROV-mateable connector. Finally, an override interface is also supplied to allow ROV operation of the valve.

Choke-Insert Running Tool (CIRT) The Master Flo CIRT is designed to align the choke insert in the correct orientation and to control the final landing speed on docking with the choke valve. It is also designed to protect the choke insert from damage during handling. The CIRT is a simple, reliable mechanical system; it requires assistance from an ROV, but it has no electrical or hydraulic requirements. The running tool latches onto a modified API-17D receptacle on the Choke Insert Module. The latch mechanism is engaged and released by an ROV-operated lever. The lower guide frame interfaces with a guide funnel that surrounds the valve body and ensures that the tool is in correct horizontal and rotational alignment before final landing. Three soft-landing cylinders on the running tool control the final rate of descent during landing. The HRV choke valve is also available configured for use with third-party running tools.

The Master Flo Test and Transport Skid is secures and protects the choke insert module during transport and storage and facilitates testing of the insert before deployment. It consists of a skid frame with two 'dummy' bodies--one for transport and storage, and one for testing- complete with guide funnels for use with the CIRT.
The skid also includes a toolbox that is supplied with the basic tools necessary for testing and maintenance of the insert modules.The transport body is designed to securely hold a choke insert module without contacting any of the seals. The test body, on the other hand, engages the seals so that pressure-integrity tests may be performed; it comes with a test panel that is mounted to the skid frame. Alternately, skids are also available with two transport bodies.