Blanking Cap Retention Lugs for Pressurized Ferrule Connections
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Solution Overview
Problem
Existing arrangements for blanking a coupling member on a pressurized container are prone to the blanking cap flying off if the clamp is released while the container is pressurized, posing a safety risk.
Innovation Solution
The introduction of a blanking cap with safety lugs that extend about the outer circumferential periphery of the coupling member, limiting axial movement and preventing the cap from flying off even if the clamp is released under pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a blanking cap is secured to a port ferrule using a clamp with seal member, then the port can be effectively closed off, but the cap may fly off if the clamp is released while the container is pressurized
Solution Approach 1:
The safety lugs are designed to engage with the port ferrule before pressure buildup occurs, creating a preliminary mechanical constraint that prevents the blanking cap from flying off. The lugs extend through openings in the ferrule and are positioned to limit axial movement, establishing a safety mechanism in advance that counteracts the potential harmful effect of pressure-induced cap ejection
Solution Approach 2:
The invention adds a new dimensional constraint by introducing safety lugs that extend axially through the ferrule structure. This creates a third dimension of control (axial positioning through the ferrule body) in addition to the traditional radial clamping force, thereby preventing cap displacement in the axial direction even when the clamp is released
2Reliability
If the clamp is tightened to compress the seal member and form a fluid tight seal, then sealing effectiveness is improved, but the structure becomes more complex
Solution Approach 1:
The safety lugs serve multiple functions: they act as positioning elements during assembly, provide mechanical retention to prevent cap ejection, and maintain axial alignment between the blanking cap and port ferrule. By integrating these multiple functions into a single structural feature, the design achieves enhanced reliability without proportionally increasing complexity
Data Source
AI summary
An assembly 10 includes a coupling member 12 having a first annular, radial connection flange 22 and a blanking cap 14 comprising a disc-like member 30 which defines a second, corresponding annular, radial connection flange 34. The connecting flanges are clamped together by a clamp (16) with a seal member 18 in-between. The blanking cap comprises a pair of safety lugs 62 attached to the disc-like member which each extend about an outer circumferential periphery of the first connection flange 22. Each safety lug has an abutment 68 for engagement with the first connection flange to limit axial movement of the disc-like member away from the coupling member. The lugs 62 prevent the blanking cap from flying off in the event the clamp is released whilst the interior of the coupling member is pressurised. The lugs 62 may each have a stop member 66 which defines the abutment and which may take the form of an elongate curved member extending circumferentially about an axis of the connection flanges. The clamp may be tri-clamp.