Premium Connection with DL-JF1(FOX Equivalent)
Dynoland is an advanced premium threaded connection which has
several years experience in steel production, and provides
proprietary DL-J series OCTG for sour service, low temperature
service and hi-collapse service, in addition to API grades. And, we
have designed a connection which uses innovative design concepts to
overcome problems found in conventional premium connections.
Advanced thread geometry, a unique seal design and innovative
gauging techniques combine to reduce thread galling and enhance
sealing performance. Dynoland has been field-proven around the
DOUBLE PITCH CHANGE
The pin member retains a standard pitch over its entire length. The
box member features three sections, each having a different pitch:
increased pitch (in relation to the pin) in the outer part of the
box, standard pitch in the center section, and reduced pitch in the
inner section. This produces gaps at the load-bearing flanks of the
threads in the inner and outer regions of the thread prior to
make-up and running.
The gaps between the load-bearing flanks of the threads are closed
by make-up torque and by the axial load imposed by pipe weight.
Threads are preferentially loaded in the center of the connection,
with reduced loads in the inner and outer sections. The risk of
thread galling is reduced by the lower level of radial thread
interference in the DL-JF1 connection in comparison to other