API RP 2SM:2001 pdf download

API RP 2SM:2001 pdf download.Recommended Practice for Design,Manufacture, Installation, and
Maintenance of Synthetic Fiber Ropes for Offshore Mooring.
4.6.10.2 UV Resistance
Polyester ropes hase excelknt resistance to UV light, and jacket design need no sake account of thisaspevi. trncoserd aramid ropes may wfThr degradation of suriace yams if exposed to UV radiauon awaiting instaiblion or it permanently deployed. uncoered. in the upper few metres of waler. In such cases an opaque coser is recommended.
4.6,10.3 MarIne Growth
Minor strength loss in synthetic fiber ropes caused by marinc growth or its by-products has been reported. Marine organisms with hard shells can grow between the rope jackct and the load beannjj air and cause abrasion damage to core yarns. Soft marine growTh may limit visibility and hence affect the ability of an ROV to inspect the rope. Marine growTh may also influence the drag loading on the line and hence loadings on the whole mooring system. For operations where marine growth is a concern, the fiber ropes should be placed below the marine growth zone. If manne growth is to be removed mechanically this should be done in such a way that damage to the rope itself is asoided.
4.6.11 Snap Back at Failure
Considerable energy will be stored elastically in the tenstoned lines of a taut leg mooring and the safety implications for the creas and equipment. especially during handling and installation if one of the lines was to break, should be cunsid.
4.6.12 Effect of Water Depth
At 2.000 m (&560 ft) depili. the hydrostatic pressure is 20 MPa 12.900 psi). which is about 2% of the strength of polyester or nylon yarns and a smaller fractkm of the strength of the other yams. This would have a negligible effect on yam mechanical properties, and would only be responsible for a small transverse strain and the accompanying axial strain on a rope.
5 Mooring Design and Analysis
5.1 GENERAL
This section is based on the reconumtendations given in API RP 25K III. Sections 4 through X. Modifications needed to cover the case of synthetic fiber rope mooring lines are provided below.
5.2 MOORING CONFIGURATION
A mooring system with synthetic fiber ropes can he configured as either a taut leg or a casenamy system. The choice depends on many considerations which are beyond the scope of this document.A taut-leg mooring (TLMy has a smallermooring footprint than the conventional catenary mooringsystem.This can be particularly important for the field layoutof production installations in congested development areas.The taut leg mooring systems also differ from conventional catenary moored systems in that the anchor must resist sub-stantial vertical load.