Segmented Snout Sleeve for Precise Flexible Lance Positioning
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Solution Overview
Problem
Existing systems lack an efficient method to precisely position flexible tube cleaning lances within a heat exchanger tube sheet without removing the domed cover, requiring frequent vessel entries and inadequate guidance for high-pressure fluid rotary nozzle systems.
Innovation Solution
A snout apparatus comprising a series of connected segments with tubular and collar elements, featuring shoulder bolts and chamfered slots for secure alignment and minimal deflection, allowing for the guided passage of flexible lances between a lance drive and positioner apparatus, utilizing cam-lock or tubular connector fittings for quick disengagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a rigid guide structure is used to precisely position flexible lances, then positioning precision is improved, but the system cannot accommodate flexible lance movement and high-pressure fluid dynamics
Solution Approach 1:
The guide structure is divided into multiple modular segments that can be assembled in series. Each segment contains positioning features and connection points, allowing the overall structure to maintain precision while accommodating flexible lance movement through the segmented configuration.
Solution Approach 2:
The guide structure incorporates dynamic elements including adjustable positioning mechanisms and flexible mounting points that allow the rigid guide to adapt to flexible lance movement while maintaining precise positioning capability during operation.
2Ease of operation
If the domed cover is removed to access the heat exchanger tube sheet, then lance positioning is simplified, but operational safety and equipment protection are compromised
Solution Approach 1:
A guide structure with extended reach is introduced as an intermediary tool that allows lance positioning to be performed through the existing domed cover opening. The guide extends into the confined space, enabling precise lance placement without requiring removal of the protective domed cover.
3Adaptability or versatility
If frequent vessel entries are required for lance repositioning, then lance adaptability is improved, but operational efficiency and productivity decrease
Solution Approach 1:
The guide structure is designed with universal features including multiple mounting positions, adjustable components, and standardized connection interfaces that allow a single guide system to accommodate various lance repositioning requirements, eliminating the need for frequent vessel entries and multiple specialized tools.
4Measurement precision
If a complex positioning system is used to achieve precise lance alignment, then positioning precision is improved, but device complexity increases
Solution Approach 1:
The guide structure incorporates self-aligning features and self-positioning mechanisms that automatically guide the lance into the correct position without requiring complex external positioning systems or multiple adjustment steps, achieving precise alignment through inherent design features.
Data Source
AI summary
A snout apparatus for guiding high pressure flexible lances between a lance drive apparatus and a flexible lance positioner apparatus includes one of a male tubular connector and a female tubular connector fitting adapted to fasten to a flexible lance drive apparatus, another one of a male and a female tubular connector fitting adapted to fasten to a flexible lance positioner, and a plurality of segments connected together in series so as to connect in series between the one and another connector fittings. Each segment may include a cylindrical tube portion sized to receive and pass therethrough flexible lances and a tubular collar portion connected to the tube portion. The collar portion has peripheral arcuate closed slots adjacent to and spaced around a distal end of the collar portion. Shoulder bolt fasteners are each fastened to a next segment tube portion and extend through one of the closed slots.