Corrosion-Resistant Manway Hatch Cover Design
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Solution Overview
Problem
Conventional manway hatches for fluid storage and transport tanks suffer from corrosion issues due to exposure to caustic fluids, leading to degradation of metal components.
Innovation Solution
A manway hatch design featuring a corrosion-resistant synthetic resin shell encapsulating a metal plate, with a multi-stage latch mechanism and drip lip to prevent fluid ingress and manage pressure, ensuring the cover can be safely opened and closed while protecting against fluid contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal plate is used for the manway cover, then structural strength is improved, but corrosion resistance deteriorates due to exposure to caustic fluids
Solution Approach 1:
The patent employs a composite structure consisting of a metal plate core encapsulated within a corrosion-resistant polymer shell. This composite design combines the high structural strength of metal with the corrosion resistance of polymer materials, allowing the manway cover to withstand both mechanical loads and exposure to caustic fluids without degradation.
Solution Approach 2:
The corrosion-resistant polymer shell acts as an intermediary barrier between the metal plate and the caustic fluids. This protective layer prevents direct contact between the corrosive environment and the metal surface, thereby eliminating corrosion while preserving the structural integrity provided by the metal core.
2Reliability
If the cover is sealed tightly to prevent fluid leakage, then sealing performance is improved, but pressure buildup worsens creating safety hazards
Solution Approach 1:
The latch mechanism incorporates a spring-loaded design that utilizes elastic deformation (a reversible phase transition in the spring material) to create a pressure-regulating effect. The spring compresses under increasing pressure differential, maintaining the seal while allowing the system to safely manage pressure buildup through controlled mechanical response.
Solution Approach 2:
The latch mechanism is designed with dynamic characteristics, allowing it to respond to changing pressure conditions. The spring-loaded latch can flex and adjust under pressure, maintaining sealing contact while accommodating pressure variations, and can be quickly released to vent pressure when needed, providing both secure sealing and pressure management.
Data Source
AI summary
A manway hatch is used with a tank defining a chamber in which fluid is stored and/or transported. The manway hatch comprises a base and a cover. The base is configured to be fixed to the tank and defines an opening configured to communicate with the tank chamber. The cover is movably positioned in a covering relationship with the opening and presents an inner cover surface facing the tank chamber. The inner surface is formed at least substantially of a synthetic resin or other non-corrosive material.