Corrosion Control

LTK Engineering Services’ corrosion engineering practice focuses on the design of mitigative measures for galvanic and stray-current corrosion control for underground pipelines, reinforced concrete structures, grounding systems and other elements associated with dc-electrified transit operations and utilities. Building trust and confidence with every assignment we complete, we meet client needs and expectations with functional, attractive designs, properly integrated technologies and quality workmanship.

Corrosion engineering services provided by LTK include:

  • Planning 
  • Detailed Design 
  • Preparation of Detailed Design Criteria 
  • Environmental Assessment for Soil and Atmospheric Corrosion 
  • Evaluation Studies for Cathodic Protection/Stray Current/Reinforced Concrete 
  • Failure Analysis 
  • Cost Analysis 
  • Development of Operation and Maintenance Procedures 
  • Critical Project Review 
  • Construction Management 
  • Project Oversight 
  • Training

LTK staff actively participates in various corrosion control related organizations including NACE International, ASTM, AWWA, IEEE, APTA and others. Members of our staff are active in these organizations and take leadership roles in advancing the field of corrosion science and engineering.


Corrosion Control for dc Stray Current Interference

The evaluation and assessment of stray current interference from both dynamic (transit) and static (cathodic protection) sources requires specialized experience and equipment. LTK’s staff has a vast amount of experience in the control of corrosion caused by stray current. We possess the proper equipment for field measurements and soil evaluation allowing for the most accurate assessment possible and have highly skilled engineers that have applied specialized techniques required to evaluate and mitigate stray current.

LTK offers an environmental assessment of the conditions surrounding any potential interference problem with respect to electrical coupling characteristics, soil and underground conditions, proximity to the affected structures and sources, power or load levels, duration of effects, weather conditions and other conditions which impact the design and operation of DC powered systems.

Additionally our transit system design and evaluation methodology includes the latest techniques in computer traction power simulation, cutting edge negative return electrical isolation techniques and state-of-the-art technologies for the design of traction power systems to minimize stray current interference. We have unparalleled experience in implementing these technologies from an overall systems approach.

Specialized techniques and equipment are employed to evaluate the parameters that are critical in determining the level of interference and the proper mitigation measures. We have a proven performance record in conducting these studies.

Operation and maintenance of the transit system, cathodic protection system, and interference mitigation measures are critical in maintaining the effectiveness of the corrosion control measures. LTK can customize the O&M procedures for each project and provide training in this area.


Cathodic Protection Services

LTK offers a wide range of cathodic protection services performed by highly qualified engineers and technicians. Our corrosion engineering staff holds professional registration in many states and NACE International certification. Protection evaluation and design has been conducted for ports, harbors, tank farms, water and wastewater plants, natural gas and petroleum pipelines, and structures adjacent to dc transit.

LTK’s corrosivity surveys include the evaluation of the environmental conditions of the site or right-of-way (ROW) with regards to in-situ soil resistivity, soil chemistry, stray current interference from dynamic (transit) or static (cathodic protection) sources, identification of locations of possible induced ac power, and atmospheric conditions.

The evaluation of existing cathodic protection systems and subsystems is important for determining the need for upgrades and proper protection of the intended structures. LTK offers evaluation of impressed current, galvanic current, electrical isolation, grounding, test facilities, induced ac power, and coating integrity.

LTK’s cathodic protection design team evaluates multiple options to provide designs that are cost effective and will provide the desired protection objectives while minimizing the effects on surrounding facilities. Design project tasks include the development of a basis of design, design calculations, materials selection, and development of cost estimates, plans and specifications. Design includes the preparation of plans in AutoCad or Microstation format for inclusion in the overall design package.

The operation and maintenance of cathodic protection systems is an integral part of any corrosion control program. These procedures are prepared for individual projects and the training of the maintenance personnel is tailored to the client’s specific needs.


Corrosion Services for Reinforced Concrete

Corrosion Control for reinforced concrete covers a wide range of structures including bridge decks, pipelines, buildings, process structures and sewage and water treatment structures. New materials and technology are continually being implemented in the design, construction, rehabilitation and maintenance of concrete structures. LTK’s corrosion engineering staff has experience in the use of the latest technologies for new and existing structures.

Corrosion evaluation of concrete structures include electrical potential mapping, chloride ion evaluation, reinforcement depth of cover, electrical continuity evaluation, corrosion rate measurements, environmental condition assessment, concrete resistivity measurement, and delamination surveys. LTK can develop site specific testing protocols for determining the corrosivity and as a basis for design of mitigation and protection strategies.

The design of corrosion control for reinforced concrete structures has seen dramatic developments in recent years. The use of galvanic anode cathodic protection is being implemented on a wide variety of existing structures and impressed current cathodic protection can be used on existing or new structures. Metallizing and barrier coatings find widespread application in the protection of reinforced concrete. Non-metallic and corrosion LTK’s design criteria provide cost effective, state-of-the-art design criteria, systems design and installations.

The operation and maintenance of corrosion control for reinforced concrete structures includes specialized procedures for monitoring and inspection of coatings, metallizing and cathodic protection. These procedures typically include cathodic protection monitoring, corrosion rate measurements and condition assessments. LTK customizes the operation and maintenance procedures for each project and can provide training and technical assistance subsequent to the installation of repair or mitigation measures.

When railroads and transit agencies call on LTK, they know their needs and expectations will be met with functional, attractive designs, properly integrated advanced technologies and quality workmanship. LTK approaches each project with professionalism, building trust and confidence with every assignment we complete.