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Flexible Roof Drain Systems For External Floating Roof Tanks

Flexible Roof Drain Systems For External Floating Roof Tanks

DirecTank supplies and integrates flexible roof drain assemblies that safely remove accumulated rainwater while accommodating full roof travel and demanding operating conditions.
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Overview

Flexible roof drain systems are critical to external floating roof tank operation, allowing rainwater to be removed safely as the roof rises and falls with product level.
As the roof moves, the drain assembly must maintain continuous flow without kinking, twisting, flattening, or placing undue stress on fittings. Hose-based roof drains provide a reliable discharge path while preserving mechanical integrity across the full operating range of the roof.
DirecTank specifies, supplies, and integrates flexible roof drain assemblies for petrochemical, fuel storage, and industrial tank applications — supporting safe operation and long-term asset reliability.

Design & Construction

Flexible roof drain systems supplied by DirecTank are configured to deliver
dependable performance in demanding tank environments. Key design
considerations include:

  • Hose assemblies engineered to accommodate full roof travel
  • Reinforced construction to resist collapse, flattening, kinking, and torsion
  • Abrasion- and weather-resistant outer jackets for harsh tank-top exposure
  • Secure hose-to-fitting connections designed to maintain leak-free operation
  • Configurations to suit a wide range of tank diameters and roof designs
  • Options specified for new installations and retrofit applications

Key Benefits

Reliable rainwater removal

Helps prevent standing water and associated roof loading, supporting safe operation in wet-weather conditions.

Designed for full roof travel

Accommodates continuous vertical movement without compromising flow performance or mechanical integrity.

Durable, reinforced construction

Engineered to withstand mechanical stress, tank-top exposure, and long-term service conditions.

Reduced maintenance requirements

Robust hose construction helps minimise kinking, abrasion, and premature wear during operation.

Installation flexibility

Suitable for integration into new tank builds or retrofits, with configurations to suit site constraints.

Compatible with EFR configurations

Specified for use across a range of external floating roof designs and common industry applications.

Applications and Sectors

Flexible roof drain systems are used across a wide range of external floating roof storage applications, including:

Petrochemical storage terminals

Fuel and hydrocarbon tank farms

Industrial liquid storage facilities

EFR tanks in critical infrastructure environments

Compliance and Standards

Flexible roof drain systems supplied by DirecTank are specified to support safe operation of aboveground storage tanks in accordance with recognised industry standards and good engineering practice.
System selection considers operational duty, environmental exposure, and long-term mechanical performance in external floating roof tank environments.

Resources and Next Steps

  • Download the Flexible Roof Drain Systems brochure →
  • Speak to a DirecTank engineer about your application →
  • View compatible floating roof seal solutions →
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