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NXT-FC-EFR

NXT-FC-EFR installation completed

GRP / GRE Full-Contact External Floating Roof

Application-specific composite external floating roof technology for safe, reliable and low-emission operation of open-top aboveground storage tanks.

Introduction​

NXT-FC-EFR is a GRP / GRE full-contact external floating roof designed for open-top aboveground storage tanks. The roof floats in direct contact with the stored liquid and is engineered to eliminate vapour space below the roof, improve emission performance and support reliable long-term tank operation.

 

Each NXT-FC-EFR is designed according to the actual tank geometry, stored product, operating conditions, climatic loads and project requirements. The composite construction is selected for the chemical environment of the application and includes a dedicated corrosion barrier on the product-contact side.

 

The NXT-FC-EFR is typically supplied as a complete floating roof package including rim seal technology, roof drainage equipment, vents, supports, guide pole / gauge pole sealing solutions and other required floating roof accessories.

NXT-FC-EFR Cross Section

NXT-FC-EFR system layout with ONE rim seal technology, TRUE roof sump / drain valve and PURE roof drain swivel joint.

Key Performance Features

Technical Aspects

  • GRP / GRE full-contact external floating roof design

  • Application-specific engineering based on tank geometry, operating conditions and climatic requirements

  • Seamless composite roof structure for high emission reduction performance

  • Material selection according to stored product and chemical environment

  • Dedicated corrosion barrier on the product-contact side

  • Corrosion-resistant composite roof structure with no protective coating system required

  • Continuous roof slope to the drainage port located in the roof center

  • Integration of ONE rim seal technology, TRUE roof sump / drain valve and PURE roof drain swivel joint

 

Operational Aspects​

  • Designed for maintenance-free operation of the composite roof structure under specified service conditions

  • No corrosion-related coating maintenance compared with carbon steel roof structures

  • Full-contact design to eliminate vapour space below the roof

  • Engineered roof drainage concept for rainwater removal from external floating roofs

  • Low-profile construction to support available tank working capacity

  • Project-specific evaluation for stored product, fill rates, turbulence, seal forces and operating cycles

  • Turnkey installation by WLI’s qualified field service team

 

Roof Drainage System

The NXT-FC-EFR is engineered with an integrated roof drainage concept. Rainwater is directed towards the roof centre by the roof geometry and removed through a project-specific roof drain system.

​Typical drainage equipment includes:

  • TRUE roof sump / drain valve

  • PURE roof drain swivel joint

  • Stainless steel roof drain piping

  • Roof center drainage port

  • Emergency drainage concept, where required

  • Project-specific calculation and documentation

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Emission Control

  • Full-contact floating roof concept for improved emission reduction performance

  • Seamless composite roof structure to avoid deck seam emissions

  • Compatible with ONE primary and secondary rim seal technology

  • Designed to support compliance with applicable air emission regulations

  • Emission calculations and improvement assessments available as part of WLI engineering services

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Safety and Reliability

  • Engineered for reliable floating behaviour under project-specific operating conditions

  • Composite material selection according to chemical and operational requirements

  • Anti-static design concept according to applicable project requirements

  • Integration of vents, supports, manways, foam dam, roof drain system and required roof accessories

  • Documentation available for engineering review, inspection and project handover

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Project Execution

  • Site-built installation inside the tank

  • Turnkey installation service by experienced and qualified WLI field personnel

  • Project planning and shutdown coordination support

  • Installation possible in new-build and retrofit projects

  • As-built documentation after completion

  • Engineering support from concept evaluation to final installation

Installation / Completion

NXT-FC-EFR installation completed with stainless steel platform for existing rolling ladder

NXT-FC-EFR installation completed with new stainless steel platform for the existing rolling ladder.

Rim vent pipe installation in NXT-FC-EFR floating roof sidewall and composite core structure

Rim vent pipe installation integrated into the floating roof sidewall and composite core structure.

Sloped composite core material for central drainage of NXT-FC-EFR external floating roof

Sloped composite core material designed to direct rainwater towards the central drainage port.

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