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DNV-OS-C201 Structural Design of Offshore Units (WSD method)
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Sec.13
H 300 Tendons
Sec.13 H
301 The most relevant accidental events for the tendons are:| — | missing tendon |
| — | tendon flooding |
| — | dropped objects |
| — | flooding of hull compartment(s). |
Sec.13 H
302 Tendon removal condition (e.g. for maintenance and/or
inspection) requires analysis of the TLP structure with environmental
loads with 10-2 annual
probability of exceedance to satisfy the ALS. The same applies to tendon
flooding, if relevant. Consideration should be given to the expected
frequency of tendon removal and the length of period for which one
tendon is likely to be out of service.
Sec.13 H
303 Tendon failure will have substantial consequences and therefore
the tendons shall be designed with sufficient safety margin. The
effect on the surrounding structure due to possible accidental failure
events and the consequential release of elastic energy stored in
the tendon shall be considered. Guidance note:
Damage to the TLP from tendon failure does not need to be
considered provided the annual probability of tendon failure is
less than 10-5 due to
each accidental event. ---e-n-d---o-f---G-u-i-d-a-n-c-e---n-o-t-e---
Sec.13 H
304 Dropped objects may cause damage to the tendons and in particular
the top and bottom connectors may be exposed. Shielding may be required
installed.
Sec.13 H
305 Flooding of hull compartments and the effects on design shall
be analysed thoroughly.
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