GPT Industries, a portfolio company of Branford Castle Partners, has acquired Integrated Rectifier Technologies.
Branford Castle acquired GPT Industries, a manufacturer of pipeline sealing and electrical isolation products, from publicly traded EnPro Industries in January 2023. The acquisition of Integrated Rectifier Technologies is the first add-on for GPT under Branford Castle ownership.
Integrated Rectifier manufactures and services transformer rectifiers and other related technologies used to mitigate corrosion in pipelines, tanks, and offshore structures. Customers of the company are active in the oil and gas, water utilities, and infrastructure sectors. Integrated Rectifier was founded in 2001 and is headquartered in Calgary, Alberta.
Cathodic protection systems are used to prevent corrosion on metal pipelines, especially those buried underground or underwater. These systems work by applying a small electrical current to the pipeline, making it the “cathode” in an electrochemical circuit, which stops the metal from rusting. Commonly used in oil, gas, and water infrastructure, cathodic protection significantly extends pipeline life and helps prevent costly leaks or environmental damage.
Integrated Rectifier’s primary products include SCR transformer rectifiers, switch mode rectifiers, and monitoring accessories. SCR rectifiers (Silicon Controlled Rectifiers) and switch mode rectifiers both convert AC to DC power but differ in size, efficiency, and technology. SCR rectifiers use thyristors (an electronic switch that controls electricity flow) and are larger, more rugged, and well-suited for harsh environments like remote pipeline sites. Switch mode rectifiers use high-frequency switching, making them smaller, more energy-efficient, and easier to control, but they can be more sensitive to environmental conditions.
GPT Industries produces flange isolation kits (FIKs) and monolithic isolation joints (MIJs) that are used in oil, natural gas, and water pipeline applications to prevent pipeline failures and protect against potential explosions, fires, and pollution. A FIK is a set of components designed to provide protection against vibration, noise, and thermal expansion in pipelines. The kit typically includes a gasket, sleeves, and fasteners. A MIJ is a solid block with no moving parts that provides an electrical break between segments of the pipeline.
GPT’s product portfolio includes Pikotek insulating gaskets, LineBacker sealing systems, and the IsoJoint monolithic isolation joint, all engineered to prevent pipeline corrosion, ensure flange integrity, and enhance operational safety. GPT is led by President Darin Lane and is headquartered in Denver.
“Together, we’ll enhance the technologies that support corrosion mitigation efforts, improve monitoring capabilities, and ultimately deliver greater value to our partners,” said Mr. Lane. “We look forward to working together to offer customers more products and solutions.”
“The energy and infrastructure sectors are seeing increased demand for pipeline safety solutions that bolster product reliability and deliver innovation for the future,” said Marilyn Yang, a principal at Branford Castle. “This combination will enable both companies to extend their impact across new and existing industries, and we’re excited to support the GPT team as they accelerate growth.”
The pipeline sealing, cathodic protection, and infrastructure integrity sector is seeing a steady rise in demand as regulators tighten safety standards and operators contend with aging assets. Energy and utility companies are putting more money into corrosion prevention, leak detection, and remote monitoring systems to stay compliant and keep equipment running longer. The focus now is on lifecycle management—using data to predict failures before they happen and avoid expensive, unplanned shutdowns. According to Grand View Research, the market is moving toward integrated systems that tie together sealing technologies, cathodic protection, and digital asset tracking to extend asset life and improve overall reliability.
Branford Castle invests in companies that have enterprise values of up to $100 million and EBITDA of less than $15 million. Sectors of interest include consumer products and services, commercial distribution, industrials and specialty manufacturing, business services, and logistics. Branford Castle was founded in 1986 and is led by President and CEO John S. Castle and Managing Partner David Castle.
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