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Pull Tee Redesign for Underground Paste Piping

ESoliDesign (ESD) collaborated with Regent Solutions to improve the design of an underground paste pipe pressure relief device known as the Pull Tee.
This low-cost, zero-maintenance safety component allows safe discharge of cemented tailings under pressure — providing a simpler alternative to automated valve systems used in underground mining operations.

The client sought a design that would make the tee leg the intentional failure point during pull-off, allowing it to be easily replaced without removing the entire assembly.
ESD developed two sizes — 150NB (6″) and 200NB (8″) — with complete 3D modelling, mechanical analysis, and fabrication drawings ready for production.

Project Scope and Deliverables

Key deliverables included:

  • Develop configurations for both 150NB and 200NB schedule-80 pipe
  • Ensure controlled failure occurs in the leg section during removal
  • Estimate required pull-off force and optimise wall thickness accordingly
  • Add flange/disconnection interface for easy leg replacement
  • Deliver fully detailed 2D/3D fabrication drawings
Original Pull Tee design used for underground paste piping [AI Generated]
Pull Tee Example- AI Generated

ESD’s design team began by reviewing the original hand sketches, field photographs, and operational feedback provided by Regent Solutions.
Through close collaboration, both teams exchanged design insights and field observations to ensure the new Pull Tee would meet the client’s performance expectations and installation standards.

A new 3D CAD model was developed, integrating a flanged connection at the tee leg to make it replaceable in the field.
The design also incorporated a reinforced coupling and guide saddle arrangement that controlled where deformation occurred under pulling load — ensuring the leg became the predictable failure point while protecting the main tee body.

Throughout the design process, Regent Solutions provided valuable feedback drawn from practical field experience.
ESD implemented these inputs into the final geometry, confirming that the new configuration aligned with on-site installation practices, preferred weld orientations, and maintenance routines.

Structural checks and geometric validation verified that the leg shears safely under defined loads while maintaining full operational integrity of the main assembly.
The resulting design balances structural reliability, field serviceability, and manufacturing consistency, all refined through collaboration with the client’s engineering and maintenance teams.

 

mining pull tee redesign

Deliverables

  • Full 3D CAD models for both 6″ (150NB) and 8″ (200NB) versions
  • 2D fabrication drawings (PDF) in ESD’s manufacturing-ready format
  • Design validation for leg removal force 
  • Concept drawings and plot files for client approval
  • Updated documentation for production and installation
Pull Tee CAD Drawing

Project Outcome

The redesigned Pull Tee achieved:

  • Improved safety — predictable failure at the replaceable leg section
  • Faster maintenance — damaged components replaced without pipe disassembly
  • Consistent manufacturing — clear fabrication drawings and tolerances
  • Operational compatibility — identical installation process for mine crews

This design provided Regent Solutions with a robust, field-tested, and manufacturable version that improved both product reliability and ease of maintenance.

Client Testimonial

"Very happy with the end product and it is due to ESoliDesign taking the time to understand the problem from the get go. Brought a lot of design and fabrication experience to the table and helped to bring my idea to life."
Tim Le Lievre
Director

Key Deliverables

  • Two Pull Tee sizes: 150NB (6″) and 200NB (8″)
  • 3D CAD models and fabrication drawings
  • Design optimisation for controlled failure
  • Revised coupling configuration for easier installation
  • Flanged replacement leg and weld-on saddle interface

Need product redesign or mechanical documentation for mining or industrial applications?
ESD delivers robust, manufacturable designs supported by clear fabrication drawings and engineering insight.

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