Gas Markets LNG American Bureau of Shipping

Proprietary software from ABS
allows for dynamic load-based
structural evaluation. Here ABS
SafeHull For LNG provides a 3-
D zoom in, fine mesh model of
hopper knuckle zone.

Sloshing simulation conducted
with ABS 3-D proprietary
software analyzes the
deflections and stresses
on a membrane-type tank
and containment system of an
LNG vessel.

Gas Markets

LNG

CNG

LPG

Engineering Services

Emerging Technologies

| Engineering Services | Structural Analysis | Analytical Tools |

Engineering Services

Plan Review-Hull Structural Analysis. Review LNG carrier to ABS Rules and the IMO International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk (IGC Code). Review material selection, welding procedures, scantlings, overall strength, local strength and local stress concentrations, buckling and fatigue.
Plan Review- Machinery. Focuses on piping and electrical systems with review taking into account the consequences of loss of propulsion capability, loss of maneuverability, loss of electrical power, fire, explosion and others.
Plan Review- Cargo Containment and Cargo Handling Systems. ABS reviews and can perform its own independent tank calculations to confirm that the tanks comply with all applicable regulations and codes.
Cargo Handling System Design. Reviews all aspects of proposed system for compliance with ABS Rules and IGC Code. Aspects such as piping arrangement, piping system analysis, loading and unloading systems, venting and gas-freeing systems as well as procedures for cooling, loading and discharge.
Engineering Verification.
Concept Approvals.

Other engineering services are available for these specialized carriers, including: vibration analysis, recommendations for emergency shutdown systems, habitability and human factor engineering.

Structural Analysis

Structural analysis of the various types of containment systems (membrane tanks, spherical tanks or independent prismatic Type B tanks), hull proportions and interaction between the containment system and the hull structure demand sophisticated technical expertise. ABS has been at the forefront of supplying industry with technology solutions for LNG transport and storage.

A suite of ABS proprietary computer programs evaluates the effects of static and dynamic loadings. These programs include:

ABS SafeHull for LNG Carriers
ABS SafeHull Dynamic Loading Approach (SH-DLA)
ABS Shipmotion
ABS ILOAD

Analytical Tools

Experienced ABS technical staff have developed and apply the following analytical tools to the LNG carrier review process.

Vibration Analysis
Sloshing Analysis with proprietary ABS Slosh 2-D and 3-D Calculations to assess flow simulation and pressure
Heat Transfer Analysis for Independent or Membrane Tanks
Spectral Fatigue Analysis
Buckling Analysis

Other services are available including the issuance of a Certificate of Fitness for Carriage of Liquefied Gasses In Bulk to confirm compliance with the IMO IGC Code.