Reintroducing AP4

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  • Company

Last year, we set out to clearly define who AP4 is after a series of acquisitions over the last six years.1

To clearly state our capabilities for the power generation market, in attempt to earn your trust and the opportunity to serve you. This included talking to our own end-user clients to help us with this. To our delight, the feedback was incredible – we just needed to do a better job of clarifying all of our capabilities.

We’re excited to re-introduce ourselves to you now, including a new website and refreshed brand.

Who is AP4?

AP4 specializes in Turbine, Control and Excitation parts and services to keep your power plant operational and extend the life of your legacy equipment – most notably, GE and Alstom gas turbines and controls.

Our personal, responsive approach helps maintain and extend critical asset output. Market leading technical expertise, reliable parts distribution and commercially sound solutions combine for accelerated performance and peace of mind.

By combining our promises of expertise, fast and focused response, value, and delivery, we deliver parts and services that maximize uptime and extend asset life. A promise powered by experts.

Our 4 Specialties

Controls Solutions

AP4 provides expert controls solutions for gas and steam turbine controls, excitation controls, and LCI/SCF controls parts and support. We have prioritized building a highly experienced, tenured team of field engineers to provide this expertise.

Services include troubleshooting, preventative maintenance, retrofits, training and more for GE, ABB/Alstom, and other select control systems.

Parts and Repair (Turbine and Controls Parts)

Fast, reliable parts distribution and managed repair services for ancillary gas turbine parts, including fuel system components, hydraulic components, control system components, and more.

We maintain a large inventory of GE LM and GE controls parts, also supporting Alstom/ABB, Rolls Royce, Pratt & Whitney equipment and more. We are an authorized distributor for leading manufacturers like Advanced Atomization Technologies, Parker Meggitt, Unison, and more.

Turbine Services

Expert turbine services to owners and operators of Alstom gas and steam turbines. Our OEM-trained engineers, with extensive experience from ABB® and Alstom®, provide specialized services in troubleshooting, maintenance, and upgrades for gas and steam turbines. All powered by HTS, an AP4 company.

Installation Services

Gas turbine centerline installation services for new build power plants. Commissioning and startup for instrumentation, controls, and rotating equipment.

New website

The new ap4.com covers all of these capabilities in much greater detail. It also includes an all-new parts search, featuring over 9000 parts listings.

The new site is fully responsive, and ready to be viewed on desktop or mobile. 

We invite you to explore, and when ready, use the forms on the site and/or add parts to a quote basket and complete the forms there for a fast and fair quote.

Discover Our capabilities

Turbine, control and excitation parts and services to keep your power plant operational no matter what.

Our Capabilities