OS-C501

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Offshore Standard DNV-OS-C501, November 2013 App.A Check-lists for design input – Page 210 A.3 Loads A.3.1 Functional loads — Weight — Reactions from components — Interactions with other components (wear, friction, interference) — Applied tension — Pre-stressing (permanent curvature, mooring/anchoring…) — Permanent deformation of supporting structure — External hydrostatic pressure — Vacuum — Service induced vacuum — Internal pressure — Thermal stresses due to temperature of content — Slugging flow — Internal fluid flow — Loads induced by frequent pigging operations — Loads related to operations and normal use of the installation (cranes, helicopters, drilling, engorgement…) — Fouling — Traffic loads — Live loads — Installation loads. A.3.2 Environmental loads — Wind — Waves — Currents — Ice — Possible loads due to ice bulb growth — Snow — Earthquake — Movement of earth — Cover (soil, rock, and mattresses…) — Reaction from seafloor — Permanent deformation due to subsidence of ground — Soil conditions — Thermal expansion and contraction due to external temperatures — Moisture (swelling loads) — Tides — Vibrations — Trawl — Flooding / ground water buoyancy. A.3.3 Accidental loads — Collisions (vessel impact or other drifting items) — Dropped objects — Explosion — Fire (load redistribution during / after fire) — Operational malfunction (e.g. leakage or other effects from nearby pipes…) — Trawl (hooking is normally to be classified as accidental loads) — Dragging anchor — Unintended change in ballast condition — Mud slides — Failure of an anchor line or dynamic positioning system — Weld spatter — Handling by forklift. DET NORSKE VERITAS AS
Offshore Standard DNV-OS-C501, November 2013 App.A Check-lists for design input – Page 211 A.4 Environments The term environment designates in this standard the surroundings that impose no direct load on the structure. The environment may impose indirect loads on the structure, e.g. thermal stresses or swelling due to moisture uptake. This should be considered as a load effect, and calculated according to the relevant parts of Sec.8. However, the environment is generally considered for its effect on the degradation of material strength. Table A-5 Examples of Environments Temperature internal and external Temperature variations Temperature gradients UV radiation Moisture NATURAL Sea water Lightning Acid rain Atmospheric electrical field Animals (e.g. shark bites on tethers, elephants walking on pipes) Transported or contained fluids and chemicals Temperature internal and external Pressure internal and external Oil spill Cleaning materials FUNCTIONAL Paint solvents Accidental chemicals Fire Process gas leaks Service induced shocks Accidental high pressure steam A.5 Distribution types of basic variables From DNV Classification Notes – No. 30.6 - Table 2.1 Table A-6 Standard variables and corresponding distribution types Variable name Distribution type Wind Short-term instantaneous gust speed Normal Long-term n-minute average speed Weibull Extreme speed yearly Gumbel Waves Short-term instantaneous surface elevation (deep-water) Normal Short-term heights Rayleigh Wave period Longuet-Higgins Long-term significant wave height Weibull Long-term mean zero upcrossing or peak period Lognormal Joint significant height/mean zero upcrossing or peak period 3-parameter Weibull (height) / Lognormal period conditioned on height Extreme height yearly Gumbel Current Long-term speed Weibull Extreme yearly Gumbel Forces Hydro-dynamic coefficients Lognormal Fatigue Scale parameter on S-N curve Lognormal Fatigue threshold Lognormal DET NORSKE VERITAS AS
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OS-C501

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