Is it necessary to install a downhole safety valve in a subsea ... - NTNU
Is it necessary to install a downhole safety valve in a subsea ... - NTNU
Is it necessary to install a downhole safety valve in a subsea ... - NTNU
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DHSV and a low-pressure at 5.000psi activates the x-mas tree <strong>valve</strong>s. Figure A-2 gives an<br />
overview of the actuation process.<br />
Platform<br />
control system<br />
Umbilical<br />
Hydraulic<br />
pressure<br />
system<br />
SEABED<br />
LOW<br />
HIGH<br />
Hydraulic<br />
signal<br />
X-mas tree<br />
gate <strong>valve</strong>s<br />
Pilot<br />
<strong>valve</strong>s<br />
Pilot<br />
<strong>valve</strong><br />
DHSV<br />
Figure A-2 An overview of a <strong>subsea</strong> control system provided w<strong>it</strong>h a pilot hydraulic system.<br />
A1.8 Umbilicals<br />
Electric and hydraulic umbilicals are needed for communication purposes. Depend<strong>in</strong>g upon<br />
the control system configuration umbilicals are made for the specific need of the control<br />
system.<br />
A-6
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