Envirawrap

DESCRIPTION

Envirawrap is a wraparound corrosion protection jacket system specifically designed to be an easily installed, retrofit one-piece sleeve to eliminate corrosion on pipework, jetty piles in the splash zone, offshore platform structures and subsea pipelines.

Envirawrap’s elastomeric properties and flanged closure system provide the unique ability to be removed and re-installed after inspection of the substrate without needing to buy more materials for re-installation of the jackets. Hoop tension imposed in the nylon reinforced outer layer forces the inner layer against the substrate, causing the corrosion inhibiting gel to completely encapsulate the steel surface. The gel is forced into any irregularities in the steel providing a seal, terminating the supply of oxygenated water to the pipe, riser or pile surface. Corrosion is effectively stopped. Standard lengths of 3 m which can be overlapped to cover any length of piling or pipe.

DESIGN

Envirawrap design is based around a combination of materials with proven performance within marine environments. The components which combine to form the Envirawrap system are resistant to long term immersion in both sea water and fresh water, and to the attendant biological and chemical attack. In addition, the system will withstand attack from environmental UV, ozone and temperature variations while providing permanent protection in service by resisting wave action in the splash zone, seabed erosion, and may be installed in high tidal currents.

The materials in the system are stressed below their operational limits ensuring a high safety factor in all parameters while in service. The basic objective was to design a system that, while fulfilling all of the requirements once in service, should be as quick and easy to install as possible. No labour-intensive ancillary materials such as primers, tapes, sealants or adhesives are used. This minimises the possibility of human error during the installation of the system.

CONSTRUCTION

Envirawrap panels are a multi-layer, monocoque construction, consisting of a polymeric textile, memory enhanced reinforcing element, encapsulated within the polyurethane matrix and the outer layer and in-line bonded to a polyester or polypropylene, penetration resistant felt. This inner felt layer is factory impregnated with a corrosion inhibitor, contained within a water resistant thixotropic gel. In designing the system, we considered the following operational parameters in addition to those necessary for the material to retain hoop tension throughout the projected operational life of the fabric:

LITERATURE PROVIDED

Project specific Installation Procedures will be created for each particular case, as location and conditions will vary.

Data sheet provided on request.