Bleach Plant Rehabilitation
Boise Paper
Pulp & Paper

The original design of the bleaching stage towers, vats and chests were reviewed and compared to the new operating conditions. Based on the process design changes and deterioration from 30 years of service, remediation and corrosion protection measures were developed for installation. Construction procedures were audited for quality assurance and adherence to the drawings and specifications.


  • D1 Tower
  • D1 washer vat
  • C Filtrate Chest
  • D2 Filtrate Chest

Services Provided

  • Structural Engineering
  • Rehabilitation Engineering
  • Coatings/Linings Specifications
  • Quality Management (QA/QC)
  • Constructibility / Design Review
  • Computer Aided Design and Drafting (CADD)

Summary of Rehabilitation Work and Design Changes

The D1 Tower original carbon steel roof had corroded and the FRP dispersion cone had deteriorated due to ClO2 bleaching process. Both were replaced with 6% Mb alloy steel.

The deteriorated D1 Washer Vat interior brick was removed and replaced with acid brick. The repulper inserts were replaced with 6% Mo steel alloy.

The D1 Washer Vat FRP hood was replaced with new FRP Hood.

Some repairs were made to the C Filtrate Chest South and West interior walls.

The lining on one wall of the D2 Filtrate Chest was replaced in kind.


Service Areas

  • Corrosion and Materials Engineering
    • Corrosion Control/Protection Design
    • Corrosion Analysis and Material Selection Consulting
    • Failure Analysis - Mode and Root Cause Analysis
    • Cathodic Protection System Design and Evaluation
  • Structural and Mechanical Rehabilitation Services
    • Structural Design Engineering
    • Mechanical Design Engineering
    • Condition Assessment Evaluations
    • Structural Evaluation and Analysis
    • Shop and Field QC Inspection and Support
  • Mechanical Integrity and Inspection Design Services
    • Pressure Vessel and Tank Program Development and Implementation
    • Systematic Inspection Design (SID)
    • Risk-Based Inspection
    • Integrity Evaluation and Analysis
    • Fitness-for-Service Evaluations
    • Welding Consulting and Inspection
  • Coatings and Linings Engineering
    • Consulting
    • Failure Analysis
    • Project Management
    • Quality Control and Inspections
  • Project and Quality Management Services
    • Cost Estimating Services for all Construction Disciplines
    • Project Management Services, Including Planning, Scheduling, and Project Controls
    • Quality Control Inspection and Testing Services
    • Quality Assurance Program Development for New and Rehabilitation Construction
    • Quality Assurance Program Auditing and Oversight Services
  • Training Services
    • Alloy Selection for Corrosive Environments
    • Solving Corrosion and Materials Problems for Plant Engineers
    • Welding Essentials for Plant Engineers
    • Brick and Tile-Lined Equipment Inspection and Repair
    • FRP Essentials for Pulp and Paper Mills
    • Concrete Restoration and Protection
    • Quality Assurance for Capital Projects

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