Yancheng Cyber’s lockdown screws, (LDS) utilize an external thread (ET) design that moves the threads outside the pressurized or wetted surface of the wellhead equipment. They utilize a robust Unified National Coarse (UNC) thread for the lockdown screw itself and the packing gland nut to minimize any galling. Additionally a one piece HBNR compression packing element with molded metal end caps to provide a dependable seal in multiple pressure ranges and service environments.
- They mechanically retain items installed in the bowl of a head that are under pressure
- They can be utilized to energize a compression seal or seals installed in the bowl of a head
- They can be used to prevent an item installed in the head from rotating during the drilling phase of a well
- They retain pressure in the flange of a wellhead assembly
- The lockdown screw itself and the packing gland nut aredesigned with a robust bolt type thread to prevent galling
- They utilize HBNR compression packing with molded metal end caps to provide a dependable seal in multiple pressure ranges and service environments
Lockdown Screw Components
Lockdown Screw Positions
Lock Down Screws have the following procedural requirements:
- Areeither fully engaged or fully disengaged.
- The lockdown screw gland nut cannot be rotated under pressure
- Must only be operated by fully trained and authorized SWS Field ServiceTechnicians