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significant factors, such as with deep-water drilling and under
adverse weather conditions. The ideal riser tension has been
defined as "the tension that will minimize the probability of
damaging the riser or drilling equipment, yet cause minimal wear
to the tensioners" in any given situation. In some cases, it is
desirable to use buoyancy modules along the length of the riser.
Frequently, the buoyancy provided by modules reduces tensioning
requirements by a like amount. In addition, the resultant lower
drag coefficient afforded by the smooth surface of the modules
reduces riser stress. Anything as costly and essential to operation
as the drilling riser deserves critical appraisal and evaluation,
particularly the tensioning requirements in different situations.

Figure 2.15 – Integral marine riser joint

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