lower marine riser - ορισμός. Τι είναι το lower marine riser
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Τι (ποιος) είναι lower marine riser - ορισμός

DEVICE USED ON AN OFFSHORE DRILLING VESSEL
Riser tensioner; Marine Riser; Marine Riser Tensioner

Riser card         
  • 1U 1-slot 32-Bit PCI Riser Card
  • 2U 3-slot 32-Bit PCI Riser Card
  • Phanteks Vertical GPU Bracket
CIRCUIT BOARD ALLOWING ATTACHMENT OF EXPANSION CARDS TO A COMPUTER SYSTEM WITH LOW PROFILE
Bus riser; Riser board
A Riser Card is a printed circuit board that gives a computer motherboard the option for additional expansion cards to be added to the computer.
Marine riser tensioner         
A marine riser tensioner is a device used on an offshore drilling vessel which provides a near constant upward force on the drilling riser independent of the movement of the floating drill vessel.
Drilling riser         
DEVICE USED ON A SHIP OR OFFSHORE DRILLING RIG
Marine riser; Drilling Riser; Tieback (subsea)
A drilling riser is a conduit that provides a temporary extension of a subsea oil well to a surface drilling facility. Drilling risers are categorised into two types: marine drilling risers used with subsea blowout preventer (BOP) and generally used by floating drilling vessels; and tie-back drilling risers used with a surface BOP and generally deployed from fixed platforms or very stable floating platforms like a spar or tension leg platform (TLP).

Βικιπαίδεια

Marine riser tensioner

A marine riser tensioner is a device used on an offshore drilling vessel which provides a near constant upward force on the drilling riser independent of the movement of the floating drill vessel.

The marine riser is connected to the wellhead on the sea bed and therefore the tensioner must manage the differential movements between the riser and the rig. If there were no tensioner and the rig moves downward, the riser would buckle; if the rig rises then high forces would be transmitted to the riser and it would stretch and be damaged.

Tensioners have historically been composed of hydraulic actuated cylinders with wire sheaves. More recently, active electrical motors have been used for compensation purposes.