Secondary barrier construction for vessels carrying spherical low temperature liquefied gas storage tanks

Patent · Tue May 16 04:00:00 EDT 1978

OSTI ID:6368287

Okamoto, T; Nishimoto, T; Sawada, K; Hayakawa, K; Kurihara, T

To simplify and thus reduce the cost of the secondary barrier for spherical LNG storage tanks onboard ocean-transport vessels, Japan's Hitachi Shipbuilding and Engineering Co., Ltd., has developed a new secondary-containment system that allows easy installation directly on the cargo hold's bottom plate beneath the spherical tank. The new system comprises at least two layers of rigid-foam synthetic resin sprayed on the hold plates and covered by a layer of glass mesh and adhesive. Alternatively, the layers of synthetic resin, glass mesh, and adhesive are applied to plywood attached to the hold plates by joists, thus forming an air space between the secondary barrier and the hold plates. Where the hold plates have a multisurface construction, (1) laminated rigid urethane foam blocks are butted end-to-end and are bonded to each other and to the plywood sheets at the corners between adjacent hold plates, (2) the spray-formed layers are applied between the blocks, and (3) the entire assembly is covered by a protective layer of glass mesh and adhesive.

• Assignee: Hitachi Shipbuilding and Engineering Co., Ltd.
• Patent Number(s): US 4089285
• OSTI ID: 6368287
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
032000 -- Natural Gas-- Transport
Handling
& Storage
035000 -- Natural Gas-- Storage-- (1989-)
42 ENGINEERING
420205* -- Engineering-- Transport & Storage Facilities-- (1980-)
CONSTRUCTION
CONTAINERS
DESIGN
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
LIQUEFIED NATURAL GAS
NATURAL GAS
SHIPS
STORAGE
TANKER SHIPS
TANKS
TRANSPORT