Second Hand Steam Turbine: What to Check Before You Buy

A second hand steam turbine can be a practical option for an industrial plant looking to manage its equipment investment. However, a lower purchase price is only useful when the turbine matches your steam conditions, production requirements, and maintenance capabilities.

A machine that looks well maintained may still need major repairs. Similarly, a turbine with the right megawatt rating may deliver a different output when connected to your plant’s steam system.

Before making a purchase, examine the equipment’s technical suitability, operating history, physical condition, and complete installation scope. This guide explains ten essential checks to help you evaluate a used steam turbine with greater confidence.

1. Match the Second Hand Steam Turbine to Your Steam Conditions

Start with your plant’s actual operating conditions. Do not select a turbine based on its rated power output alone.

Prepare the following information before approaching a supplier:

• Available steam inlet pressure and temperature.

• Minimum, normal, and maximum steam flow.

• Required exhaust pressure.

• Process steam demand and its daily variation.

• Required electrical output or mechanical drive duty.

• Expected annual operating hours.

For a back-pressure turbine, the exhaust steam enters the plant’s process steam system. This makes process steam requirements an essential part of equipment selection.

Ask for a performance assessment at your proposed operating conditions. A nameplate rating should not be treated as a guarantee of output at a different site.

2. Confirm the Turbine Type and Package Configuration

A used steam turbine must suit your intended application.

Check whether the available machine is a back-pressure, condensing, or extraction turbine. Then confirm the equipment included in the offer.

The package may include:

• Turbine and base frame.

• Gearbox, where applicable.

• Alternator or driven equipment.

• Couplings and guards.

• Lubrication system.

• Governing and control system.

• Instrumentation and protection devices.

• Condenser and associated equipment, where required.

Request a written inclusion and exclusion list. Missing auxiliaries can affect both the project budget and the installation schedule.

3. Review the Operating and Maintenance History

A pre-owned steam turbine should be evaluated using its records as well as its physical condition.

Ask the seller for:

• Manufacturer, model, and serial number.

• Manufacturing and commissioning dates.

• Recorded operating hours and start-stop history.

• Previous operating conditions.

• Maintenance and overhaul reports.

• Details of major repairs or component replacements.

• Available vibration and bearing temperature trends.

• Reason for decommissioning.

A turbine removed during a plant expansion may have a different history from one withdrawn after repeated operating problems.

Where records are incomplete, identify the uncertainty and include additional inspection work in the purchase evaluation.

4. Arrange a Detailed Mechanical Inspection

Fresh paint and a clean exterior do not establish internal condition.

Have a qualified turbine specialist prepare a steam turbine inspection checklist appropriate to the machine’s design and history.

The assessment should consider the condition of:

• Rotor and shaft journals.

• Moving and stationary blades.

• Nozzles and diaphragms.

• Journal and thrust bearings.

• Seals and glands.

• Casing joints and steam connections.

• Couplings and gearbox components, where fitted.

Agree on the inspection depth before purchase. A major overhaul involves examining a turbine in a dismantled condition, providing access beyond an external inspection.

The inspection report should separate acceptable components, repairable items, required replacements, and findings that need further investigation.

5. Establish the Required Tests and Acceptance Criteria

Do not accept a general statement such as “the turbine has been checked” without supporting documentation.

Ask the inspecting engineer to define the tests required for the specific machine. Depending on its condition and repair history, the proposed scope may include dimensional checks, shaft runout measurements, suitable non-destructive examinations, and balancing assessments.

For each test, clarify:

• Which components will be examined.

• Which procedure and acceptance criteria will apply.

• Who will perform and review the work.

• Whether reports will be supplied.

• How unacceptable findings will be resolved.

Where a running test is offered, establish whether it is a no-load test or a load test. Record the operating conditions and what the test can demonstrate.

A no-load run alone does not establish full-load output, steam consumption, or performance at your plant.

6. Check Controls, Lubrication, and Protection Systems

The purchase assessment should cover the complete operating package.

Ask the supplier to document the condition and proposed verification of the governing system, emergency stop valve, lubrication equipment, instrumentation, alarms, and protective trips.

Also review whether the controls can integrate with your plant’s electrical and automation systems.

For a turbine-generator package, confirm the generator voltage, frequency, rated speed, protection requirements, and synchronization arrangements.

Any controls replacement or modification should appear clearly in the technical scope and project price.

7. Understand What “Refurbished Steam Turbine” Includes

A second hand steam turbine and a refurbished steam turbine are not automatically equivalent.

“Second hand” describes previous ownership or use. “Refurbished” should describe a defined scope of inspection, repair, replacement, and testing.

Before accepting a refurbishment claim, request:

• The inspection findings.

• A list of completed repairs.

• Details of replaced components.

• Measurement and test reports.

• Outstanding work or operating restrictions.

• Warranty coverage and exclusions.

Ask whether refurbishment has already been completed or will begin after the order. This distinction affects delivery planning and the handling of unexpected findings.

8. Evaluate Steam Consumption and Expected Performance

Purchase price is only one part of the investment.

Request expected output and steam consumption at your normal operating point. Where your plant operates at varying loads, ask for an assessment across the expected operating range.

Clarify whether the quoted figures are based on original design data, engineering calculations, historical records, or recent testing.

For a back-pressure installation, evaluate electricity generation alongside the plant’s process steam requirements. Back-pressure turbine systems can recover power while reducing steam pressure for downstream use.

Avoid relying on a general savings percentage. Project economics should reflect your steam balance, operating hours, electricity costs, maintenance requirements, and installation expenditure.

9. Calculate the Total Installed Cost

Compare offers on a consistent scope.

The total cost of a used steam turbine project may include:

• Equipment purchase.

• Inspection and refurbishment.

• Dismantling, packing, and transport.

• Foundations and civil work.

• Steam piping, valves, and insulation.

• Electrical equipment and cabling.

• Auxiliary systems and controls integration.

• Erection, alignment, and commissioning.

• Initial spares and operator training.

Confirm which party is responsible for each activity.

Also account for the production shutdown or connection work needed at your site. An incomplete package with a low selling price may require substantial additional expenditure before it can operate.

10. Confirm Documentation, Spares, and After-Sales Support

Before finalizing a second hand steam turbine supplier, establish what support will be available after delivery.

Request available drawings, manuals, maintenance instructions, electrical diagrams, and spare parts information.

Discuss:

• Availability and lead times for critical spares.

• Installation and commissioning support.

• Operator training.

• Future overhaul assistance.

• Warranty terms and claim procedures.

• Responsibility for resolving commissioning issues.

Record agreed performance conditions, delivery obligations, inspection requirements, and acceptance criteria in the purchase documents.

Discuss Your Requirement with NS Terbo

When evaluating a second hand steam turbine, share your inlet steam pressure, temperature, available flow, required exhaust pressure, and power requirement with NS Terbo.

Include details of your existing steam system and the equipment package you need. This gives the technical discussion a clear starting point and helps identify the inspection, refurbishment, and installation scope to assess before purchase.

Visit NS Terbo to discuss your requirement.

FAQs:Second Hand Steam Turbine

1. What should I check before buying a second hand steam turbine?

Check compatibility with your plant’s steam conditions, operating history, mechanical condition, inspection reports, package completeness, and total installed cost. Also confirm the testing scope, spare parts availability, warranty terms, and commissioning responsibilities.

2. What is the difference between a used and a refurbished steam turbine?

A used steam turbine has previously operated or been owned. A refurbished steam turbine should have undergone documented inspection and a defined scope of corrective work. Ask for the repair details and test reports because refurbishment scope varies between offers.

3. Will a second hand steam turbine deliver its nameplate power output?

Not necessarily. Actual output depends on inlet steam pressure and temperature, steam flow, exhaust conditions, machine condition, and operating limits. Request a performance assessment for your site conditions before committing to the purchase.

4. How can I assess the remaining service life of a used steam turbine?

Remaining service life cannot be established from age or appearance alone. A qualified assessment should consider operating history, starts and stops, previous repairs, component condition, and relevant inspection results. Where records are missing, the assessment should clearly state its limitations.

5. What additional costs should I consider beyond the turbine price?

Consider inspection, refurbishment, transport, foundations, piping, electrical work, auxiliary equipment, erection, commissioning, and initial spares. Compare supplier quotations using the same equipment and service scope to understand the complete project cost.