Manway Cleaning Guard Deflector for Tank Safety

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Solution Overview

Problem

Existing tank cleaning processes pose risks to personnel from chemical and hot water spray, particularly in vessels without permanently mounted cleaning systems.

Innovation Solution

The Manway Cleaning Guard (MCG) is designed to cover the open manway of a tank, using quick release clamps and a clear acrylic body with a stainless steel frame and EPDM rubber deflector to contain spray while allowing drainage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a permanently mounted cleaning system is installed, then cleaning efficiency is improved, but device complexity and cost increase

Engineering Contradiction:

Improvecleaning efficiencyVSAvoidsystem complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The cleaning system is divided into a portable guard device that can be easily attached and removed, rather than a permanently mounted system. The guard segments into a body, deflector, and positioning elements that work together as a complete but separable unit.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The portable cleaning guard acts as an intermediary device between the cleaning personnel and the harmful spray/chemicals. It provides protection without requiring permanent installation, serving as a temporary but effective barrier during cleaning operations.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If the manway is left open for drainage, then drainage efficiency is improved, but chemical and hot water spray escape posing safety risks

Engineering Contradiction:

Improvedrainage efficiencyVSAvoidchemical and hot water spray exposure

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The deflector is designed with specific local qualities - a smooth curved surface that redirects spray locally away from the manway opening while allowing drainage. The positioning elements provide localized sealing at the manway interface without blocking the entire opening.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The deflector converts the harmful spray directed toward personnel into a beneficial redirected flow that exits safely away from the manway. The same open manway configuration that enables drainage is now protected by the deflector that redirects harmful spray into safe discharge paths.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Object-affected harmful factors

If a protective cover is installed over the manway, then personnel safety is improved, but drainage capability may be compromised

Engineering Contradiction:

Improvepersonnel safetyVSAvoiddrainage capability

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The guard is designed as a dynamic protective solution that can be quickly installed and removed based on operational needs. The positioning elements allow the guard to be securely attached during cleaning operations for protection, and easily removed when drainage is required, providing adaptive protection without permanent constraints.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20250065929A1Manway Cleaning Guard

Publication Date: 2025.02.27 EWEN DAVID

AI summary

A safety device for tank manways, which is easily installed and removed, to protect personnel from hazardous spray from cleaning chemicals used when the tank is being cleaned. The device deflects and blocks the spray, allowing it to safely flow out the bottom of the manway.