Include balance-of-plant: fuel gas skids, cooling systems, fire and gas detection, electrical systems and auxiliaries. These are often split across several vendors, and your DCS is where they meet. Clear scope here saves weeks of commissioning effort and gives your operators one coherent system to learn.
USP&E as Your Guide to a Complete Cooling Scope
Equipment-led buyers comparing new OEM builds inevitably evaluate surplus. A low-hour LM- or Frame-class generator set that is already built can beat a 24-month factory queue — if title, hours, and technical condition are real. This article explains how USP&E treats used GT generators as engineering products, not classified ads.
Start With Your Site and Operating Profile
Size coolers for your site’s hottest ambient and dirtiest air, with margin for fouling. Air-cooled fin-fan coolers need cleaning access and spare fan motors; water-cooled units need a reliable cooling water supply and water treatment. Make sure trip and alarm setpoints for bearing temperature and oil pressure are listed in the controls scope.
List every system your turbine needs to run and mark who supplies it: foundations and civil works, fuel gas reception and conditioning, generator step-up transformer, medium-voltage switchgear, protection, auxiliary power, cooling, fire detection and suppression, compressed air, controls and SCADA. Anything without a name beside it is a future change order.
Choose the Arrangement and Draw the Boundaries
If your programme grows toward data-centre power plants, size shared balance-of-plant for the final site. Gas reception, switchyards, cooling and control buildings are expensive to expand around live equipment, so reserve land and capacity from the start. Route pipe racks, cable trenches and roads so new units can connect without crossing energised areas or interrupting the blocks already in commercial operation.
Draw a clear scope boundary between the generator supplier and the balance-of-plant contractor: terminal points, pipe and cable connections, signal lists for temperatures, flows and alarms, and who commissions what. Gaps at boundaries are where your schedule slips and arguments start, so walk the drawing with both parties before contracts are signed.
Demand Records and Plan for Growth
New GT procurement lead times force early decisions on foundations, transformers, and fuel gas treatment. Used-and-new GT buying packages should present records, inspection scopes, and logistics dimensions in one file whether the candidate is new, remanufactured, or verified used. Adjacent used-versus-new comparisons help owners avoid overpaying for schedule certainty they do not need—or underbuying when schedule risk is existential.
Equipment buyers still want a decision matrix. Keep it : schedule certainty vs documentation depth; package completeness vs site-build risk; remanufacture scope honesty vs broker photo sets; frequency match vs false inventory hits; EPC wrap vs multi-contractor interfaces. Sister expand content at new vs used decision matrix and the light K1 guide at used vs new adjacent remain complementary — this wave page owns the dual-path buying programme for OEM-class packages.
Proof from recent work
Data centres · USA
Major US hyperscale developers
USP&E refurbished 7 GE Frame 6Bs to zero hours in-house for major US hyperscale developers.
Mining · Mali
Barrick Gold, Loulo-Gounkoto
USP&E refurbished the 104 MW power station, rebuilding more than 80 MW of Caterpillar CM32 engines and adding new zero-hour capacity.
Read the case study ›Mining · Tanzania
Perseus Mining, Nyanzaga Gold Project
USP&E supplied 28 Cummins KTA50 containerised gensets for the Nyanzaga Gold Project in Tanzania.
Your path from first call to reliable power
Your 3-step plan: 1. Share your site data, operating profile and package offers under NDA. 2. Receive a cooling scope, boundary drawing and signal list. 3. Install, commission and maintain cooling with accountable O&M.
- Record the site climate, altitude, dust, and corrosion exposure, plus the expected operating profile for each generator.
- Choose the cooling arrangement for each unit and name the party that supplies and owns every component in the loop.
- Draw the scope boundary, terminal points, and signal list between generator supplier and balance-of-plant contractor.
- Request cooling records for every candidate, from a remanufactured GE Frame 6B to used or new gas turbines or natural gas engines, through USP&E live inventory.
- Prove the cooling path in factory and site tests, then hand over baselines, spares lists, and maintenance triggers to O&M.
Common questions
Why does generator cooling scope matter for new gas turbines?
USP&E scopes generator cooling carefully because a cooler sized for mild test conditions can derate or trip a generator in desert heat. A complete scope names the site climate, operating profile, arrangement and responsibilities, so cooling gaps are found on paper rather than on hot afternoons.
What generator cooling arrangements are common?
USP&E sees generators cooled by open or closed air circuits and by air-to-water coolers fed from a closed water loop. Each arrangement differs in water use, fans, filters and maintenance, so the choice is made from your site climate, water availability and operating profile.
Why should cooling be sized with margin?
USP&E sizes cooling with margin because coolers foul and age, losing performance every season. A system with no margin may meet its test on day one but derate within a few years, especially in dusty or hot sites where fouling builds quickly.
What belongs in a cooling scope boundary?
USP&E boundary drawings show terminal points, pipe and cable connections, signal lists for temperatures, flows and alarms, and who supplies, commissions and maintains each part. Clear boundaries prevent gaps between the generator supplier and the balance-of-plant contractor, and they make your commissioning plan far easier to write.
Why owners choose USP&E
USP&E is a full-service engineering, EPC and O&M company, not a broker. One team designs, builds and runs your plant, so nothing falls between contracts.
Racing a go-live date?
Tell us your load, fuel and timeline. A USP&E engineer will come back with options for New Gas Turbine Generators projects, not a sales pitch.