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Sub-skill of mooring-analysis: 3. Mooring Line Components (+1).
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| name | mooring-analysis-3-mooring-line-components |
| description | Sub-skill of mooring-analysis: 3. Mooring Line Components (+1). |
| version | 1.0.0 |
| category | engineering |
| type | reference |
| scripts_exempt | true |
Chain:
def chain_properties(
diameter: float, # mm
grade: str = "R4"
) -> dict:
"""
Get chain properties.
Args:
diameter: Nominal chain diameter
grade: Chain grade (R3, R4, R5)
Returns:
Chain properties
"""
# Minimum Breaking Load (MBL) for studless chain
# API RP 2SK Table 4-1
grade_factors = {
'R3': 0.0219, # tonnes/mm²
'R4': 0.0246,
'R5': 0.0273
}
k = grade_factors.get(grade, 0.0246)
MBL = k * diameter**2 # tonnes
# Weight in air (approximate)
weight_air = 0.0218 * diameter**2 # kg/m
# Weight in water (steel in seawater)
submerged_factor = (7.85 - 1.025) / 7.85 # Steel in seawater
weight_water = weight_air * submerged_factor # kg/m
return {
'diameter_mm': diameter,
'grade': grade,
'MBL_tonnes': MBL,
'MBL_kN': MBL * 9.81,
'weight_air_kg_m': weight_air,
'weight_water_kg_m': weight_water
}
Wire Rope:
def wire_rope_properties(
diameter: float, # mm
construction: str = "6x36"
) -> dict:
"""
Get wire rope properties.
Args:
diameter: Wire rope diameter
construction: Wire construction (6x36, 6x19, etc.)
Returns:
Wire properties
"""
# Approximate MBL (6x36 IWRC)
MBL = 0.0175 * diameter**2 # tonnes
# Weight in air
weight_air = 0.040 * diameter**2 # kg/m (steel core)
# Weight in water
submerged_factor = (7.85 - 1.025) / 7.85
weight_water = weight_air * submerged_factor
return {
'diameter_mm': diameter,
'construction': construction,
'MBL_tonnes': MBL,
'MBL_kN': MBL * 9.81,
'weight_air_kg_m': weight_air,
'weight_water_kg_m': weight_water
}
Polyester Rope:
def polyester_rope_properties(
diameter: float, # mm
linear_density: float = None # kg/m
) -> dict:
"""
Get polyester rope properties.
Args:
diameter: Rope diameter
linear_density: Mass per unit length (if known)
Returns:
Polyester properties
"""
# Approximate MBL
MBL = 0.0048 * diameter**2 # tonnes
# Weight in air (if not provided)
if linear_density is None:
linear_density = 0.0045 * diameter**2 # kg/m
# Weight in water (polyester is neutrally buoyant in seawater)
# Specific gravity ~1.38, seawater ~1.025
submerged_factor = (1.38 - 1.025) / 1.38
weight_water = linear_density * submerged_factor
# Axial stiffness (EA)
EA = 850 * MBL # kN (approximate)
return {
'diameter_mm': diameter,
'MBL_tonnes': MBL,
'MBL_kN': MBL * 9.81,
'weight_air_kg_m': linear_density,
'weight_water_kg_m': weight_water,
'EA_kN': EA
}
Safety Factors (API RP 2SK):
safety_factors:
intact_condition:
ULS: # Ultimate Limit State
permanent_mooring: 1.67
temporary_mooring: 1.50
ALS: # Accidental Limit State
permanent: 1.25
temporary: 1.15
damaged_condition: # One line failed
ULS:
permanent: 1.40
temporary: 1.25
ALS:
permanent: 1.15
temporary: 1.05
fatigue:
design_factor: 10.0
Design Load Cases:
load_cases:
operating:
return_period: "1 year"
vessel_offset: "Normal operation"
mooring_check: "Fatigue dominant"
extreme:
return_period: "100 year"
vessel_offset: "Maximum excursion"
mooring_check: "ULS"
survival:
return_period: "10,000 year"
vessel_offset: "Survival condition"
mooring_check: "ALS"
damaged:
condition: "One line failed"
environment: "100 year"
mooring_check: "Damaged ULS"