Blend, Polish, and Peen Turbine Maintenance
In order to meet the supplemental maintenance recommendations for the F-Class turbine rotors IAW TIL 1543-2, Advanced Turbine Support has worked with PSM to develop and deliver a blend, polish, peening (BPP) turbine maintenance service that can be implemented in the field and shop environments. This process can be performed on any cooling slot profile to provide an optimal edge condition to minimize the risk and initiation of cracking in the Inconel turbine wheels. Advance Turbine Support recommends performing this service on the cooling slots of both the first and second stage turbine wheels to minimize the sensitivity in this high nickel alloy to surface imperfections.
Blending is performed in a two-step process which first provides an optimal edge radius to minimize stress risers in the area of interest, and then removes any machining/tooling marks to ensure a continuous smooth surface is present. The polish steps next ensure that the surface is brought to a mirror-like appearance to take full advantage of the compressional forces applied during the peening process.
The peening process is performed using the latest technology and advanced equipment utilizing a flapper peening technique. The intensity of the flapper peening is performed to the engineering supplied values and the surface is reviewed under magnification to ensure 100% coverage was obtained.
Prior to performing the BPP process, the dovetail slots are inspected via eddy current array and fluorescent penetrant inspections to make sure no detrimental defects are present. A post BPP Fluorescent Penetrant Inspection is performed to document that no subsurface indications were opened during the blending and polishing processes.
When you require turbine wheel dovetail inspections and blend, polish, and peen (BPP) turbine maintenance services, choose Advanced Turbine Support.
Our NDE methods and turbine rotor maintenance are completed by experienced inspectors who have been in the industry for years. The brands and models we often work with are listed below:
GE: Frames LM2500, LM5000, LM6000, LMS100, Frames:3, 5, 6, 7B, 7E, 7EA, 7F, 7FA, 7H, 9F, 9FA
Siemens: 171, 191, 251, 301, 501 D5, D5A, AA, F, G, SGT6-5000F, V84.2, V94.3
Alstom: GT-8, GT11, GT24
Pratt and Whitney: FT-4, FT-8
Rolls Royce: Avon 200, Trent 60
It is vital to have your turbines inspected on a regular basis. Proper borescope inspections, avail an opportunity to effectively plan for upcoming or emergent outages by documenting the overall condition of a unit. These inspections also provide information for mitigation plans to help eliminate damage that could result in collateral damage, ultimately costing you more in the long run. We offer a number of services to keep your machines running at their best.