Negative-Pressure Pipeline Section for Spill Containment
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Solution Overview
Problem
Existing pipeline systems lack effective methods to prevent spills and minimize environmental damage when breaching sensitive areas, such as streams, lakes, and bogs, due to the lack of modifications that reduce the risk of leakage and containment of transported materials.
Innovation Solution
The system creates a negative pressure environment within a pipeline segment by using a pump downstream and a flow restrictor upstream of the sensitive area, ensuring that in the event of a breach, ambient materials are drawn into the pipeline rather than the transported materials being released, with optional features like differential-pressure actuated valves and fluid capacitors to manage pressure spikes and contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pipeline sections crossing sensitive areas are not modified, then the pipeline structure remains simple and cost-effective, but the risk of spills and environmental damage increases significantly
Solution Approach 1:
The pipeline is divided into a protected section crossing the sensitive area and upstream/downstream sections. The protected section is isolated with its own pressure control system (pump and restrictor), allowing spill prevention measures to be applied only where needed rather than to the entire pipeline, thus balancing reliability improvement with manageable complexity
Solution Approach 2:
The system establishes negative pressure in the protected section before any breach occurs. By pre-positioning the pump and restrictor to create and maintain negative pressure conditions, the system ensures that ambient materials are drawn into the pipeline rather than pipeline contents escaping, preventing spills before they can cause environmental damage
2Reliability
If a pump and flow restrictor are installed to create negative pressure, then spill prevention capability is improved, but the device complexity and initial cost increase
Solution Approach 1:
The negative pressure system (pump and restrictor) is installed only in the specific protected section of the pipeline that crosses the sensitive area, rather than throughout the entire pipeline. This localized approach provides spill prevention where it is most needed while minimizing the number of components and overall system complexity
Solution Approach 2:
The flow restrictor acts as an intermediary component that works with the pump to create and maintain negative pressure. The restrictor controls the flow of ambient materials into the pipeline while the pump maintains the pressure differential, together forming a coordinated system that prevents spills without requiring complex active control mechanisms
3Extent of automation
If differential-pressure actuated valves are installed upstream, then automatic shut-off capability is improved, but the device complexity and pressure spike risk increase
Solution Approach 1:
The differential-pressure actuated valve uses feedback from the pressure differential across the restrictor to automatically control valve position. When negative pressure is established downstream of the restrictor, the pressure differential automatically actuates the valve to the appropriate position, providing spill prevention without requiring external control systems or complex automation
Solution Approach 2:
The valve actuation mechanism uses pneumatic or hydraulic pressure differentials to automatically control valve position. The pressure differential created by the pump and restrictor system directly actuates the valve through pneumatic/hydraulic means, providing automatic control without requiring electrical systems or complex mechanical linkages
4Object-affected harmful factors
If the pipeline operates at negative pressure, then environmental protection is improved by preventing material discharge, but the risk of pressure spikes and valve instability increases
Solution Approach 1:
The system is designed to accommodate pressure variations by pre-establishing negative pressure conditions and providing adequate head pressure through the pump. This cushioning effect allows the system to absorb pressure spikes and maintain stable operation without compromising the negative pressure protection mechanism
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
This approach significantly reduces the risk of environmental contamination by containing spills within the pipeline, allowing for the safe passage of materials through sensitive areas without releasing them into the environment, and includes features for automatic shut-off and purging solutions to mitigate damage.
Implementation Method 1
The system creates a negative pressure environment within a pipeline segment by using a pump downstream and a flow restrictor upstream of the sensitive area
Implementation Method 2
a flow restrictor upstream of the sensitive area, ensuring that in the event of a breach, ambient materials are drawn into the pipeline
Data Source
AI summary
A petroleum pipeline safety system for preventing contamination of an environmentally sensitive area close to a pipeline includes an upstream portion of the pipeline supplying a flow of fluid material, a crossing portion of the pipeline receiving the flow of fluid material from the upstream portion and conveying the flow of fluid material through the environmentally sensitive area to a downstream portion of the pipeline, the downstream portion, a pipeline pressure activated valve selectively capable of blocking the flow of fluid material from entering the crossing portion based upon a change in pressure within the crossing portion, and a fluid capacitor connected to the upstream portion configured to filter out a pressure spike in the upstream portion associated with the valve blocking the flow of fluid material.