Positive and Adjustable Choke Devices
The choke device adjusts the fluid flow rate through orifices or seals.
The adjustable choke device is provided with an orifice whose diameter is variable and the fluid flow rate can thus be controlled permanently.
The most important component is the rod apex, which adjusts the fluid flow rate passing through the adjustable choke device along with a positive choke. The rod apex consists of an assembly of taper surfaces and it modifies the fluid cross-section section surface by its displacement upward and downward the positive choke.
The adjustable choke device is provided with a graduated bushing, which permits the diameter of the cross-section surface to be read whenever requested.
The most important component of the positive choke device is the positive choke having a passage orifice whose size depends on the desired flow rate.
The positive choke device is delivered with a positive choke set whose diameters are those requested by the customer. If the customer does not require the positive choke set through the contract, the device will be delivered with a positive choke of 5 mm diameter.
The materials meet the requirements imposed by the service conditions of the chokes.
The materials afferent to the corrosive service conditions meet the requirements imposed by NACE MR0175.
The technical conditions, materials, checks, tests and marking shall be in accordance with the API 6A requirements.
Minimum informative data to be specified in case of inquiry for choke devices:
- choke type
- max. choke orifice
- sizes and rated pressure
- end connection type and sizes
- temperature and service conditions
- PSLs and PRs
For more information, please consult the wellhead equipment brochure here.