Northwest Natural 12

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Northwest Natural 12 Pipeline Integrity Project
Final Design Presentation

• Team Members
• Jon Ziring
• Zack Lemmon
• Long Nguyen
• Academic Advisor
• Faryar Etesami
• NWN Sponsor Advisors
• Ross Lisle
• Jodi Wright

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Introduction

• Sections of the pipeline required repair or
  modification.
• When changes are made, the line stopper fittings
  used to isolate the section are left welded to
  the pipe.
• Though sealed by the fitting, the enclosed
  pipeline is left with a large cut out section.

Mueller Line Stopper Unit
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Mission Statement

• Design a method for repairing the integrity of
  the pipeline to near its original condition.
  This method is to be cheaper, easier, and faster
  than replacing the line stopper fittings.

Hole In Pipeline Due To Fitting Installation
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Important Design Criteria

• Cost
• Each unit must cost less than 300.
• Manufacturability
• Materials In house materials
• Standard tools and dimensions to simplify
  production.
• Feasibility
• Accurate placement
• Alignment must not rotate.
• Clearance able to clear the minimum inner
  diameter of the access hole.
• Precision able to accommodate for deviations in
  placement and alignment.

• Reliability
• The device should have a minimal probability of
  failure, as it is to remain a permanent fixture
  in the pipeline.
• Simplicity
• The device should require minimal training in
  order to produce, insert, and activate.
• Obstruction
• Minimize bore reduction, maximum 25 bored
  reduction.

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Design Progress
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In The Beginning

• First Design
• Solid piece insert
• Simply rests on pipeline
• Alignment from side tabs

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Problems With Solid Piece Design

• Access Hole Clearance

Wall Dimension Variance
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Other Designs

• Other Design Concepts
• Fits Through Access Hole
• Mechanically Activates
• Attaches To Pipeline

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Additional Problems

• Too Heavy
• Tolerances Too Tight
• Obstructs Flow Through Pipeline

Solid Pipe Insert
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Permanent Device

• Problems Solved
• Clears Access Hole
• Loose Tolerances
• Easily Made
• New Problem
• Must Be Removable

Permanent One-Way Insert
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Removable Device
Locking Mechanism for a Removable Insert
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Release The Insert

• New Problem
• Insert Must Separate Itself from the Insertion
  Tool
• Design Adapter to Interface Between Insert and
  Insertion Tool

Insertion Tool End
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Removable Adapter

• Separate Adapter
• The Adapter Stays With the Insertion Tool
• Insert is Released from Adapter

Removable Adapter Insert
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Final Design

• Improvements and Optimizations
• Cost
• Simplicity
• Manufacturability
• Adaptability
• Functionality

Final Design Concept
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Design Simplification
Before
After
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Existing Adapter

• Reduce Manufacturing Costs by Using Existing
  Adapter
• Disassemble Bypass Plug to Use as Adapter

Bypass Plug
Adapter
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Alignment Bracket

• Prevents Insert from Rotating when Activated
• Allows Adapter to also be used for Removal
• Accurate Flow Alignment

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Over-Center Cam-Lock

• Rotates 5 Past 90
• Prevents Device from Vibrating Loose
• Accommodates Variations in Pipe Lip Dimensions

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Over-Center Lock Test
Testing Wooden Over-Center Cam-Lock Prototype
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Pipe Locking Mechanism Test
Testing Pipe Lip Locking Mechanism Prototype
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Assembly
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Any Questions?