Floating Roof Sump Emergency Overflow Drainage
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Solution Overview
Problem
Existing drainage systems for floating roofs on storage tanks are unreliable under extreme weather conditions, prone to weight overload, and fail to prevent evaporation losses, with prior art not adequately addressing the need for a self-opening emergency overflow system integrated with primary drainage.
Innovation Solution
An emergency overflow drainage system with an upwardly inclined emergency overflow duct that connects between the primary drainage ducts, automatically activated when the water level reaches a maximum allowable level, ensuring effective drainage and preventing weight overload on the floating roof, while reducing evaporation losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a centrally positioned drain is used to remove water from the floating roof, then the drainage system is simple in structure, but it becomes unreliable under heavy rain conditions when water accumulation exceeds the drain's capacity
Solution Approach 1:
The drainage system is segmented into multiple independent drainage paths: a primary drainage system with centrally positioned drains and a secondary emergency overflow system with laterally positioned drains. This segmentation allows the system to handle excessive water loads by distributing drainage across multiple pathways, preventing single-point failure under heavy rain conditions.
Solution Approach 2:
The emergency overflow drains are designed to be dynamically activated based on water accumulation levels. When the primary drainage system becomes overwhelmed and water accumulates to a critical level, the emergency overflow paths automatically activate to provide additional drainage capacity, transitioning the system from a static single-path design to a dynamic multi-path design.
2Strength
If the floating roof is designed with high buoyancy to prevent sinking, then the roof can withstand normal water accumulation, but it becomes vulnerable to sudden weight overload from extreme weather events
Solution Approach 1:
The emergency overflow drainage system is designed to activate before the roof reaches its maximum weight capacity. By providing an additional drainage pathway that activates when water accumulation reaches a predetermined level, the system preemptively prevents weight overload conditions, rather than relying solely on the roof's buoyancy to withstand extreme loads.
Solution Approach 2:
The emergency overflow drains act as a cushioning mechanism that activates beforehand to prevent catastrophic failure. When the primary drainage system becomes overwhelmed, the emergency overflow paths provide an additional outlet that gradually releases excess water, cushioning the roof against sudden weight overload from extreme weather events.
3Productivity
If complex roof drain apparatus is used to handle water drainage, then drainage capacity is increased, but debris carried by accumulating water interferes with proper operation
Solution Approach 1:
The emergency overflow drainage system extracts the critical drainage function from the complex mechanical apparatus and implements it through a simpler, more robust structure. By providing a separate emergency overflow path with fewer moving parts and sealing mechanisms, the system reduces vulnerability to debris interference while maintaining adequate drainage capacity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides reliable and automatic drainage during primary system failures, preventing roof damage and evaporation losses by ensuring water is diverted into the storage tank, maintaining the integrity of the floating roof and reducing atmospheric losses.
Implementation Method 1
An emergency overflow drainage system with an upwardly inclined emergency overflow duct that connects between the primary drainage ducts, automatically activated when the water level reaches a maximum allowable level
Data Source
AI summary
A floating roof and emergency overflow drainage system for water accumulated on the floating roof covering liquid in a storage tank, including:a. a water collection sump formed as a downward extending recess in the top surface of the roof,b. a first drainage duct having an inlet within the water collection sump, an outlet for draining water below the sump, and an intermediate portion,c. a second drainage duct having an inlet above the top surface of the roof, an intermediate portion, and an outlet in fluid communication with the intermediate portion of the first duct in the sump, andd. an emergency overflow duct including:(1) an inlet in fluid communication with the second duct, and(2) a distal portion extending downwardly and terminating in an outlet below the sump and in the stored liquid.