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JDH Corrosion Consultants, Inc. is an engineering company specializing in

 

 

 Field Investigation & Analysis

Our firm is very experienced in conducting field investigations and specialty inspections as necessary to be able to provide specific corrosion control recommendations on various types of structures including water transmission and distribution pipelines, water storage tanks, water treatment plant structures as well as raw water facilities and structures. Field investigation and analysis experience includes the following:

  • Inspect structures and investigate corrosion related leaks
  • Monitor rectifier stations
  • Analyze corrosion products
  • Analyze coating failures and Inspect coating applications
  • Recommend addition of test stations for purposes of stray current monitoring and control
  • Performing various soil tests
  • Conduct close internal potential surveys
  • Recommend installation of IR drop free test stations in critical locations
  • Perform surveys of cathodic protection systems for pipelines, reservoirs and tanks
  • Preparation of cathodic protection and stray current survey reports
  • Preparation of cost estimates for recommended remedial action
  • Evaluate and comment on engineered cathodic protection/corrosion control systems

Additional related activities that we can provide to support the above work includes the following:

  • Confined space entry requirements
  • Traffic control for inspections and excavations
  • Test equipment operation and maintenance
  • Rectifier testing and repair
  • Safety equipment and techniques to facilitate inspections of pipelines and other structures
  • A risk assessment matrix
    • Estimate the extent of corrosion to pipelines and identify and rank those with high susceptibility for failure
    • Identify the degree of improvements necessary – replacement, repair, or restoration of cathodic protection systems, etc.
    • Provide a cost-benefit analysis of proposed improvements
  • Provide and assessment of the condition level of pipes, valves, fittings, and other components. Include methodology for estimating condition of pipes between test locations.
  • Provide a summary of findings with appropriate drawings or maps to identify locations
  • Provide mitigation measures to prevent further corrosion
  • Provide repair alternatives
  • Provide replacement recommendations
  • Prepare budget level construction estimates

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 Corrosion Control Engineering

We are experienced in the preparation of detailed installation drawings and technical specifications for the implementation of corrosion control to both existing and new structures and pipelines suitable for bidding purposes. Corrosion control engineering experience includes the following:

  • Preparation of cathodic protection designs
  • Recommend use of corrosion resistant materials
  • Locate AC power sources for rectifiers
  • Selection of ground bed locations
  • Prepare coating specifications for new structures as well as for repair and replacement
  • Prepare detailed cost estimates including
    • Cost benefit analysis
    • Value engineering
    • Budgeting for capital projects
  • Provide review comments for SFPUC designs and specifications
  • Provide system checkout, energization and adjustment following system installation
  • Prepare “as-built” drawings and Operations and Maintenance Manuals for systems
  • Provide technical reports and review technical memorandums to insure that corrosion control strategy is incorporated for risk management in the SFPUC corrosion control program
  • Provide support to SFPUC staff and others in documenting risk assessment

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 Speciality Testing Services

We are also trained in speciality testing services as follows:

  • DCVG and ACVG surveys
  • Remote field eddy current testing
  • UT measurements including D-meter and B-scan
  • Coating integrity testing using DCVG and C-scan surveys
  • Stray DC and AC current testing
  • Appropriate training for City personnel
  • Expert witness for litigation support

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