Requirements for Layout, Fastening Design and Stability Analysis
Transport Layout & Fastening Design | Sea Fastening Analysis | Stability Analysis
Sea Fastening Analysis
Criterion for requirement
Whenever there is a requirement to meet a compliance standard in verifying that an item is
fastened to a vessel for transport.
Description
Sea Fastening Analysis is based on evaluating forces per side and end calculated for each unit load. Horizontal and Vertical forces are vectored to resultant force in the transverse and longitudinal directions. These resultant vectors are used to determine the characteristic loading effect on tie-towns considering each tie-down secures port and starboard or fore and aft. Design as per Det Norske Vertas (DNV) recommendations contained in “ Marine Operations” sections “P” and “RP2”. Yield strength is from ASTM and AWS. Criterion are chosen from five available processes which may be altered if special circumstances require, Inland, DNV, Noble Denton, Gulf of Mexico Tall and Gulf of Mexico Pile.
The A.E.I. recommended criterion for offshore transport in the Gulf of Mexico for oil field operations is DNV.
Input
Forces Acting on Load: Accelerations used to calculate forces. Usually these are defined by agreed standards. Assumed maximum wind condition.
Vessel Data: Parameters used in Analysis of Stability and Trim as well as deck loading criterion for vessel.
Load Data: Required input data matrix for all loads on the vessel, weight, VCG, LCG, TCG, transverse footprint length, longitudinal footprint length, sail area, shape factor, height factor.
Trim: Distance of CG of each load from stern.
Load Spreading Recommendation: verification of requirement to spread load and input of load spreader specifications.
Safe Working Load Criterion: Parameters used to evaluate the strength of flexible sea fastening material such as chain, cable or strap. Vessel SWL parameters for connection points on deck of vessel.
Tie-Down Design: Sea Fastening design parameters, material specification, unsafe factors for material, quantity fastenings, and flexible sea fastening geometry.
A.E.I. L.L.C.