Catenary is A curve used for:
- To show Touch Down point at various tension
- §To check minimum clearance over pipeline
- To know how much wire to run
2 Types of Catenary curve
- Static curve (anchor on seabed)
- Running curve (anchor on boat)
COMPONENT TO CALCULATE CATENARY CURVE
- §Table of yperbolic function
- §Distance fairlead to seabed
- §Suspended lenght of wire or chain
- §Weight per meter of wire or chain
- §Tension at fairlead or winch (tension meter)
- §Water depth
Touchdown Point
D= [T/W-d] cosh [(T/W)/(T/W-d)]
D=Distance of touchdown point
T=Tension of wire or chain
W=Weight per meter of wire or chain
d=Depth from fairlead to seabed
Suspended Length
Minimum Lenght to Deploy
Tension Formula
MASS (in kg/m) = 0.0219 x diameter² (d in mm)
Measuring For Proof and Breaking LoadLOAD (in kN) = coefficient x d²x (44 – 0.08xd)
