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the marine riser pipe. This connector is run in a pin-up/box-down mode. It is

exactly the same as the connectors used for joining all subsequent riser joints and

the telescopic joint.

Maximum
Flexure
(10 °) Tensile Load

Figure 6.22 – Flexing
Shear
Loading uniflex.

Compression
Preload on
Seal Assembly
Assemblies

Compression
Load on
Bearing
Assemblies

An integral marine riser system is the modern approach to running the BOP

stack and is the method most commonly used today. With this system, the
individual choke-and-kill lines and, in some cases, hydraulic fluid supply lines are

attached integrally to each riser joint. Running the BOP stack, riser, and choke-
and-kill lines all in one operation represents a significant economical advantage

because it takes less time. Also, the choke-and-kill lines can be pressure tested
against the closed choke-and-kill line valves on the stack as they are run (fig. 6.23).

The physical integrity of the riser joints is preserved by eliminating all

welding except circumferential welds of the connectors to the pipe ends. The main
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