Table 1 illustrates the relatively infrequent and frequent components that demand replacement over time and the likelihood the components will attract REP interest.






















As an example of legacy engine REP activity, for many years Score Energy has been providing proven REPs, both as direct replacements and upgrades for the Rolls-Royce

Avon and the TB5000, leveraging modern design and manufacturing tools not available when these engines were originally developed.


But current production gas turbines are exposed to REP market offerings. As an example, there are multiple companies offering GE and Siemens “F-Class” REPs. Some companies making these offerings include: PSM, Allied Power Group, PWPS, Chromalloy, and others.


Allied Power Group is offering an improved F7FA combustion cap effusion targeted at a 32,000 fired hour repair/replacement interval.


Due diligence is critical

While there are many options in the independent/3rd party segment of the gas turbine aftermarket, deciding to utilize REPs is not a trivial matter. Due diligence by the operator is critical when making this decision. REP manufacturers must be diligent

in ensuring they are not infringing on OEM intellectual property. Often cost and component availability are the chief drivers for selecting an REP, but upgrade performance may also be offered.


Ensuring there is demonstrated experience, strong design and analytic expertise by the REP manufacturer is very important. Naturally OEMs continue to offer upgrades and component improvements that may make REP offerings obsolete. ■


Anthony Brough, P.E. is Principal Consultant at Dora Partners & Company, LLC.

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