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Secondary Metallic Wiper Seal

DirectFlex Secondary Metallic Wiper Seal –
For internal & external floating roof tanks

Secondary sealing solutions engineered to reduce vapour loss and support regulatory compliance.

Designed to complement primary floating roof seals, DirecTank’s secondary metallic wiper seals provide an additional layer of vapour control, supporting safe operation, environmental performance, and long-term reliability across demanding storage applications.

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Overview

The DirecTank Secondary Metallic Wiper Seal is a high-performance secondary sealing solution for internal and external floating roof storage tanks. Installed between the floating roof and the tank shell, the wiper seal works in conjunction with the primary seal to further minimise vapour emissions and enhance overall sealing effectiveness.
Manufactured using robust metallic components, the system maintains consistent contact with the tank shell while accommodating roof movement caused by changes in liquid level, temperature, and operating conditions. This design helps prevent liquid accumulation on the roof surface and reduces the risk of vapour escape that can compromise primary seal performance.
DirectFlex secondary metallic wiper seals are particularly suited to applications where enhanced emissions control, environmental protection, and operational reliability are critical, including petrochemical, fuel, and industrial storage environments.

Key Benefits

Reduced vapour loss

Helps minimise vapour emissions by providing an additional sealing layer against the tank shell.

Enhanced emissions control

Supports environmental performance by limiting vapour escape under changing operating conditions.

Complements primary seals

Designed to work in conjunction with primary floating roof seals to improve overall system sealing effectiveness.

Maintains contact during roof movement

Maintains consistent contact with the tank shell while accommodating roof movement caused by changes in liquid level, temperature, and operating conditions.

Prevents liquid accumulation

Wipes liquid from the tank shell, reducing the risk of pooling that can compromise primary seal performance.

Proven in demanding storage environments

Robust metallic construction delivers reliable performance across petrochemical, fuel, and industrial storage applications.

Key Features

Metallic wiper construction

Robust metallic plates designed to maintain continuous contact with the tank shell, providing a durable secondary sealing interface.

Independent plate configuration

Individually mounted wiper plates allow flexibility across varying rim spaces and accommodate tank shell irregularities.

Designed for internal and external floating roofs

Suitable for a wide range of internal and external floating roof configurations and storage tank designs.

Works in conjunction with primary seals

Engineered to complement primary floating roof seals, enhancing overall vapour control and system sealing effectiveness.

In-service or out-of-service installation

Can be installed safely during scheduled maintenance or tank outages, minimising operational disruption.

Durable materials for demanding environments

Metallic components selected to withstand demanding operating conditions across petrochemical, fuel, and industrial storage applications.

Applications and Sectors

DirecTank floating roof seal solutions are used across a range of storage applications where vapour control, safety, and operational reliability are critical requirements.

Petrochemical storage

Proven secondary sealing solutions for aboveground storage tanks in petrochemical facilities, supporting enhanced emissions control, safety, and regulatory compliance.

Fuel and hydrocarbon storage

Designed for tanks storing fuels and hydrocarbons, helping to minimise vapour emissions and reduce the risk of product loss during normal operation.

Industrial storage applications

Suitable for a wide range of industrial storage tanks operating under varying process and environmental conditions.

Water and wastewater applications

Applicable to floating roof tanks used in water and wastewater treatment environments, supporting operational efficiency and long-term asset protection.

Compliance and Standards

Designed for compliance in critical storage environments

DirecTank secondary metallic wiper seals are engineered to support regulatory compliance across aboveground storage tank applications where vapour control, safety, and environmental performance are key considerations.
Rather than treating compliance as a checklist item, the wiper seal is designed as a functional part of the overall sealing system—working in conjunction with the primary seal to reduce vapour escape and manage liquid accumulation under real operating conditions.

Alignment with recognised industry standards

DirectFlex secondary metallic wiper seals are developed in line with relevant industry codes and recognised standards applicable to internal and external floating roof tanks. Design considerations support compliance throughout the asset lifecycle, from installation through ongoing operation and inspection.

Supporting inspection and long-term operation

Robust metallic construction, consistent contact with the tank shell, and controlled wiping action help support predictable performance over time—reducing the risk of conditions that can compromise emissions control or inspection outcomes.

Compliance-led by design

A strong focus on materials, manufacturing quality, and installation practicality ensures the secondary wiper seal integrates effectively within compliant floating roof tank systems, supporting safe operation without adding unnecessary complexity.
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