What an Industrial Gas Turbine LTSA Should Cover

An LTSA is a long-term service agreement: one commercial instrument covering inspection planning, parts, repair and outage execution. Euroturbine writes it around the fleet you actually run — GE, Siemens, ABB, Mitsubishi or Zorya — and around the fact that many of those frames now live on aftermarket supply. A complete scope includes predictive work (vibration, performance, borescope trends), preventive outages with a frozen hot-gas-path bill of materials, corrective response with defined hours-to-site, and reporting on availability, findings and remaining life.

Spot buying means a new purchase order every outage. That works once. It starts to fail when the same machines will open twice in two years and every spring you re-argue whether aftermarket is allowed, whether HIP sits on stage 1, and whether a repaired vane may sit next to a new one. HIP is hot isostatic pressing, used to close internal voids before recoating. Budget becomes emergency premiums. Foundry slots are not reserved. Reverse-engineered numbers on a legacy frame get lost between two buyers.

Under an LTSA those arguments sit in the appendix once. Casting slots are reserved before the outage gate. You have one engineering counterpart for root-cause work, remaining-life assessment and parts — not four vendors arguing over a finding. Case. Two combined-cycle 9E units, HGP openings eighteen months apart. Year one the plant fights an OEM-only spare policy and loses two weeks on a transition-duct seal. Year two the same fight starts again. The contract that would have helped is the one that already named aftermarket qualification, the seal line, and the notice days — not a cheaper invoice on a single crate.

Write named part families, not the words “قطعات مسیر داغ”: first- and second-stage blades, vanes, liners, transition pieces, shrouds, and heavy casings as their own OEM lines. OEM means the original equipment manufacturer number already in your stores. A qualification path for non-OEM has to sit in the same clause: CMM (coordinate measuring machine), NDT (non-destructive testing), alloy certificate, coating stack. A repair / HIP / new-make tree per row, with a scrap gate in millimetres, not in adjectives.

Count notice days backward from planned case-open — typically ninety days for a foundry row, thirty for a shop repair already in process. Each call-off needs a data pack: nameplate, numbers, hours, last coating and last NDT. AOG language — the term plants borrowed from aviation for a unit that cannot start — must not empty the rest of the contract and must not turn a hollow first-stage blade into a promised ten-day pour. Case. A V94.2 inner casing heat-shield line was written as “احتراق” in a draft. Mid-outage the mixing chamber was still on a separate purchase order. Euroturbine writes those as separate OEM lines with their own notice days, next to the blades, not under one heading.

Contract or purchase order — the decision · LTSA service page · Outage parts timeline

One planned opening in the next two years does not need a five-year envelope. A one-off reverse-engineered obsolete row can sit on a purchase order. A single emergency when the case is already open is a call-off, not a reason to rewrite the fleet contract that night. A frame you will retire next year should not pull a standing foundry reservation away from the machines that stay.

Case. An SGT-600 mechanical-drive package will be retired after one more campaign. The station needs a power-turbine row and a set of seals. Euroturbine quotes that row as a one-off: OEM numbers, quantity, hours, new-make or repair. Signing a five-year LTSA to hide a messy spare strategy on that package would lock price and stock around a machine that is leaving. Use the agreement where the fleet will still be there.

Share the fleet list, the next outage date and which frames are parts-critical. Euroturbine will propose an LTSA envelope that can sit in front of plant management — or say a purchase order is still the honest tool.