Operating Tension Calculation of Subsea Riser Online Course

The top tensioning system is used to pull at the top of the drilling riser to support the weight of the riser, its components, and the fluid inside the riser; and it is also used to control the shape of the riser when subjected to environmentally-induced load effects. The tensioning system is normally composed of a number of “tensioners”. The number and rating of the tensioner units will determine the total capacity of the tensioning system. There are two types of tensioner designs (i.e., wireline tensioners and direct-acting tensioners). A wireline tensioner unit uses a hydraulic ram with a large volume air-filled accumulator to maintain near constant tension on the tensioner wires. One end of the wire is attached at the tensioner and the other is attached to the outer barrel of the telescopic joint through sheaves underneath the drill floor. A direct-acting tensioner has a hydraulic rod and piston assembly, which are attached directly to the drill floor structure and the outer barrel of the telescopic joint.

Riser Stability Calculation

The stability calculation is to calculate the minimum required top tension to verify that the tensioning system has sufficient capacity for the structural stability of the riser string with anticipated mud weight and possible of loss of one or two tensioners. Besides the minimum top tension requirements, maximum allowable top tension of the riser string is often limited by factors other than the tensioning capacity. These factors include the following: The structural capacity of the drill floor which supports the tensioning system. The tension rating of the riser joints and couplings.

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