A Khash-written technical procurement article
When a power plant, LNG facility, refinery, petrochemical complex, pipeline compressor station, or offshore asset decides to outsource turbomachinery oil filtration, the tender must not be written as a request for “filtering services.” That wording is too weak. It invites a low-cost bidder with a filter cart, a few hoses, and a day-rate technician.
For critical turbomachinery, the service being procured is not filtration. It is lubricant condition assurance.
The tender must convert oil cleanliness, varnish potential, water control, acid control, additive health, and machine reliability into measurable service outcomes. The contractor should not be paid merely because a skid was connected to the reservoir. The contractor should be paid because the oil condition improved, remained stable, and the machinery risk profile was reduced.
The Khash way to tender this service is simple:
Do not outsource activity. Outsource measurable lubricant health.
1. Define the service as turbomachinery lubricant conditioning, not oil filtration
The tender title should avoid narrow wording such as:
“Oil filtration service for turbines and compressors.”
A stronger title is:
Framework Agreement for Turbomachinery Lubricant Conditioning, Varnish Control, Dehydration, Fine Filtration, Oil Analysis, and Emergency Contamination Response Services.
This title matters because turbomachinery oils fail in several ways. Particle contamination is only one part of the problem. Critical turbines and compressors can suffer from dissolved oxidation products, varnish precursors, insoluble varnish, water contamination, acid formation, depleted antioxidants, poor filterability, sludge, aeration issues, and additive stress.
The contractor must therefore be evaluated on the ability to manage both physical contamination and chemical degradation. Varnish-forming oxidation by-products may remain dissolved in warm operating oil and later precipitate when the oil cools, which is why the tender must include soluble varnish control rather than particulate filtration only.
Khash rule:
A filter cart removes dirt. A lubricant conditioning contractor removes risk.
2. Start the tender with an asset-based scope
Large facilities should not tender one generic service for every machine. The tender must begin with an asset register and classify each system by criticality, oil type, reservoir volume, failure history, and contamination mode.
The tender should require bidders to price and propose services for each asset category:
| Asset category | Typical systems | Tender focus |
|---|---|---|
| Gas turbine lube oil | Main bearing lube oil, hydraulic control interfaces | Varnish, oxidation products, particles, water, reservoir turnover |
| Steam turbine lube oil | Main lube oil, control oil, jacking oil interfaces | Water, particles, varnish, demulsibility, oxidation |
| Turbo-compressor lube oil | Centrifugal compressor trains, integrally geared compressors | Particles, varnish, seal oil contamination, reservoir cleanliness |
| Hydraulic control systems | Servo valve systems, governor oil, actuator systems | Ultra-fine particles, varnish, acid, water, rapid response |
| Fire-resistant or synthetic fluids | EHC, phosphate ester, synthetic hydraulic fluids | Acid control, water, resistivity where applicable, varnish, compatibility |
| Gearboxes and auxiliary skids | Gear drives, turning gear, auxiliary lube systems | Wear debris, water, ISO cleanliness, flushing capability |
| Emergency response scope | Any critical reservoir after ingress or failure | Rapid mobilization, oil rescue, contamination removal, root-cause support |
The contractor should not be allowed to submit one standard filtration package for all systems. Mineral turbine oil, synthetic oil, phosphate ester fluid, compressor oil, and hydraulic oil may require different media, flow rates, materials of construction, compatibility checks, water-control methods, and disposal routes.
3. Tender the service in technical lots, but evaluate it as one reliability program
For a large power or oil and gas company, the contract should be structured in service lots. This allows specialized pricing while maintaining one integrated reliability governance model.
A strong tender structure would include:
| Lot | Service scope | Minimum requirement |
|---|---|---|
| Lot 1 | Routine offline or kidney-loop filtration | ISO cleanliness control, beta-rated final filters, flow verification |
| Lot 2 | Varnish and oxidation by-product removal | Removal of soluble and insoluble varnish-forming products during normal operation |
| Lot 3 | Dehydration and water control | Vacuum dehydration, dry gas stripping, coalescing, or approved method based on oil type |
| Lot 4 | Acid control and fluid restoration | Acid number reduction strategy, media compatibility, monitoring frequency |
| Lot 5 | High-velocity flushing and oil change support | Pre-commissioning, post-overhaul, reservoir cleaning, turbulent flushing where required |
| Lot 6 | Emergency contamination response | 24/7 mobilization, dedicated emergency equipment, spill and waste handling |
| Lot 7 | Oil analysis and reliability reporting | Sampling, laboratory testing, dashboards, technical interpretation |
| Lot 8 | Resident or call-off technical manpower | Certified lubrication technicians, supervisors, engineers, and site coordinators |
The owner may award all lots to one contractor or split them. However, the contract governance should remain integrated, because filtration, oil analysis, varnish removal, dehydration, and oil replacement decisions are connected.
4. Make the tender outcome-based
The tender should not reward the contractor for hours connected, litres circulated, or number of filter elements consumed unless those activities create measurable oil improvement.
The service outcomes should be defined as:
| Parameter | Tendered outcome |
|---|---|
| Varnish potential | Reduce and maintain MPC below agreed limit, typically <15 ΔE for low-risk condition |
| Particulate cleanliness | Achieve and maintain OEM/site ISO 4406 target |
| Water | Reduce and maintain water below OEM/site limit or below agreed saturation level |
| Acid number | Maintain below warning/condemning limit; provide restoration plan if elevated |
| Antioxidant health | Monitor depletion and escalate before the oil becomes chemically unstable |
| Filterability | Improve or maintain filterability to prevent premature filter plugging |
| Reliability | Reduce varnish-related sticking, fail-to-start events, and oil-related production risk |
| Documentation | Provide traceable oil analysis, treated volume, flow rate, DP, and recommendations |
The tender should state:
The contractor shall be responsible for achieving agreed oil-condition targets, not merely for operating filtration equipment.
This one sentence changes the procurement logic.
5. Require soluble varnish removal, not just particulate removal
This is one of the most important technical clauses in the tender.
Turbomachinery varnish is often misunderstood because it can exist in both soluble and insoluble forms. At operating temperature, varnish precursors may remain dissolved in the lubricant. When the oil cools or becomes saturated, these materials can form insoluble deposits on servo valves, bearing surfaces, reservoir walls, filters, and small-clearance components.
A conventional particulate filtration service may remove insoluble varnish after it forms, but it does not necessarily remove the dissolved material feeding the problem. Therefore, the outsourced service must include active chemical or adsorptive treatment capable of removing dissolved polar oxidation products.
Recommended tender wording:
The contractor shall provide lubricant conditioning technology capable of removing dissolved varnish-forming oxidation by-products during normal turbomachinery operation. Technologies that rely only on cooling the oil to precipitate varnish before filtration shall not be accepted as the primary varnish-control method.
The tender should require bidders to answer clearly:
| Technical question | Required answer |
|---|---|
| Does the system remove dissolved varnish precursors? | Evidence required |
| Does it work at normal oil operating temperature? | Evidence required |
| Does it remove both soluble and insoluble material? | Method required |
| Does it remove acidic degradation products? | Test data required |
| Does it affect additives? | Compatibility proof required |
| Does it require after-market chemicals? | Full disclosure required |
| Is performance guaranteed without chemical additives? | Yes/no with commercial impact |
Capability should be judged by function: varnish precursor removal, operation during normal turbine running, soluble and insoluble contamination control, acid removal, oil-life support, additive impact, and total ownership cost.
Khash rule:
If the contractor can only remove varnish after it becomes a particle, the contractor is treating the symptom, not the source.
6. Specify flow by active treatment rate, not pump size
A common tender weakness is asking for the contractor’s pump capacity. Pump capacity alone means very little. The tender must ask for the actual flow through the active treatment media, the flow through the mechanical polishing filter, bypass flow, and total treated volume.
For varnish removal in turbine mineral oil systems, a practical minimum is to process at least one full reservoir volume per day through the active varnish-removal media. For hydraulic control systems, synthetic fluids, phosphate ester fluids, or highly degraded oils, the required turnover may be higher.
Tender formula:
Minimum tender clause:
The contractor shall demonstrate that the proposed service equipment can process the required number of reservoir turnovers per day through the correct treatment media. Pump nameplate flow shall not be accepted as proof of treatment capacity.
The contractor should provide:
| Required flow data | Why it matters |
|---|---|
| Pump nameplate flow | Shows maximum hydraulic capacity |
| Actual active media flow | Determines varnish and acid removal rate |
| Polishing filter flow | Determines particulate clean-up capacity |
| Bypass flow | Shows how much flow is not being treated chemically |
| Totalizer readings | Proves actual treated volume |
| Flow trend logs | Confirms the unit was not simply connected but inactive |
| Operating hours | Confirms treatment exposure |
| DP trend | Shows media/filter loading and change-out timing |
Khash rule:
Connected time is not treated volume. Pump flow is not active media flow.
7. Build the contract around baseline, restoration, and maintenance phases
The outsourcing tender should not assume every reservoir is already in the same condition. Each asset should pass through three service phases.
Phase 1: Baseline assessment
Before mobilization, the contractor shall sample each system and provide a condition report. This should include:
| Test | Purpose |
|---|---|
| MPC varnish potential | Measures varnish risk |
| ISO particle count | Confirms solid contamination level |
| Water content | Identifies water ingress or dehydration need |
| Acid number | Tracks oxidation and acid formation |
| Strong acid number, where applicable | Identifies aggressive acid condition |
| Antioxidant health | Determines remaining oil protection |
| Viscosity | Confirms oil remains in grade |
| FTIR oxidation/nitration | Supports degradation diagnosis |
| Demulsibility | Confirms water separation capability |
| Air release and foaming | Confirms turbine oil serviceability |
| Filterability | Predicts filter plugging risk |
| Wear metals | Detects mechanical distress |
Phase 2: Restoration mode
If the oil is out of specification, the contractor shall operate in restoration mode. This may require higher treatment intensity, frequent media changes, closer sampling, and weekly or biweekly technical review for severe cases.
Phase 3: Maintenance mode
After the targets are achieved, the contractor shall maintain the oil within agreed limits using lower-intensity continuous or periodic treatment. The contract should clearly distinguish the cost and consumables required for restoration mode versus maintenance mode.
Tender clause:
The contractor shall not price all assets as if they are in steady-state condition. Each reservoir shall be classified as maintenance, elevated risk, restoration, or emergency condition based on baseline oil analysis.
8. Define proper MPC testing and acceptance
For varnish control, the tender must define the MPC method and sample preparation. On-site patch appearance alone should not be used as final acceptance evidence. Field screening may help trending, but a controlled laboratory method must govern contractual acceptance.
The tender should state:
MPC shall be measured using the latest applicable revision of ASTM D7843 or an owner-approved equivalent. Sample preparation, heating, incubation, bottle control, and chain-of-custody shall be defined before work starts.
This is critical because rapid or incomplete test procedures can make a filtration process appear successful even when soluble varnish-forming material remains in the oil and later re-establishes equilibrium.
Recommended acceptance language:
The contractor shall reduce MPC to below the contractual target, normally <15 ΔE for low-risk condition, within the agreed restoration period, subject to declared oil condition, correct unit sizing, approved media changes, and no undisclosed abnormal contamination.
The tender should also require the contractor to report:
| MPC reporting item | Requirement |
|---|---|
| Baseline MPC | Before treatment |
| Intermediate MPC | During restoration |
| Final acceptance MPC | After restoration period |
| Maintenance MPC | Monthly or quarterly depending criticality |
| Sampling location | Fixed and repeatable |
| Sample temperature condition | Recorded |
| Laboratory method | Declared |
| Sample preparation | Declared |
| Photo of patch | Included where applicable |
| Interpretation | Written by competent lubrication specialist |
Khash rule:
A varnish KPI without a sample protocol is only a slogan.
9. Specify dehydration and water-control capability separately
Water control should not be hidden inside the generic filtration scope. Turbomachinery oils may require dehydration, coalescing, vacuum dehydration, dry-gas stripping, or other methods depending on oil type and water form.
The tender should classify water as:
| Water condition | Tender response |
|---|---|
| Dissolved water | Monitor saturation and ppm |
| Free water | Immediate removal and root-cause investigation |
| Emulsified water | Dehydration and demulsibility assessment |
| Repeated water ingress | Mechanical source investigation required |
| Water-sensitive fluid | Special treatment and compatibility requirements |
The contractor must state the dehydration method, maximum water removal rate, minimum achievable water level, oil temperature limitation, compatibility with the lubricant, and effect on additives.
Tender clause:
The contractor shall provide a water-control strategy for each oil type. The strategy shall identify whether the selected technology removes free, emulsified, or dissolved water, and shall define the expected final water level.
For small reservoirs, the tender should also require a water-risk assessment when new active media is installed, because some media systems may contribute a small one-time water load that is negligible in large reservoirs but significant in small systems.
10. Include acid-control and chemically degraded oil protocols
Outsourced filtration contracts often fail because acid control is not priced or technically defined. Elevated acid number changes everything. It can shorten media life, increase change-out frequency, and indicate unstable oil chemistry.
Tender clause:
Where acid number exceeds the owner’s alarm limit, the contractor shall provide a restoration plan including media selection, expected exhaustion rate, change-out frequency, differential pressure monitoring, sampling frequency, and escalation criteria.
For very acidic oils, treatment media may exhaust rapidly and require frequent changes during initial clean-up. The tender should not allow the contractor to assume annual media life in a chemically overloaded system.
The tender should require the following decision logic:
| Oil condition | Required contractor action |
|---|---|
| Acid number normal, MPC high | Varnish restoration plan |
| Acid number elevated | Acid removal and varnish plan |
| Strong acids detected | High-risk restoration plan |
| Acid number critical | Contractor to advise whether filtration, bleed-and-feed, or oil replacement is the best route |
| Acid rising after treatment | Root-cause analysis required |
| Media exhausting quickly | Revised consumption forecast required |
Khash rule:
Do not buy a one-year media promise for a one-month acid problem.
11. Additive health must be protected
The contractor must not improve one test while damaging the oil. The tender should require evidence that the service removes contaminants and degradation products without unacceptable loss of antioxidants, antiwear chemistry, rust inhibitors, demulsibility performance, or other critical lubricant properties.
Tender clause:
The contractor shall demonstrate that the proposed media, filtration, dehydration, and chemical treatment processes do not cause unacceptable depletion of the lubricant additive package.
Antioxidant reserve is especially important. Once antioxidants are severely depleted, oil degradation can accelerate. In such cases, filtration or varnish removal may reduce contamination, but it does not automatically rebuild additive reserve. Top-up, bleed-and-feed, additive replenishment, or oil replacement may need to be treated as a separate owner-approved action.
The contractor should be required to classify the oil as:
| Additive condition | Tender implication |
|---|---|
| Healthy additive reserve | Normal maintenance service |
| Moderate depletion | Increased monitoring |
| Severe depletion | Oil management plan required |
| Very low reserve | Owner decision: bleed-and-feed, additive replenishment, or oil replacement |
| Unknown additive condition | No performance guarantee until baseline testing is completed |
Tender clause:
No after-market additive, deposit cleaner, antioxidant booster, or chemical supplement shall be introduced without written approval from the owner, lubricant supplier, and machinery technical authority where required.
This protects the owner from hidden chemical dependency and lubricant compatibility risk.
12. Require contractor equipment to meet industrial turbomachinery standards
The contractor’s equipment must be suitable for critical machinery service, not workshop cleaning.
Minimum requirements should include:
| Equipment requirement | Tender wording |
|---|---|
| Closed-loop operation | The system shall operate without open transfer or exposure to atmosphere where avoidable |
| Certified pressure components | Pressure vessels, housings, and hoses shall be rated, certified, and documented |
| Final filtration barrier | Oil returning to the reservoir shall pass through a final beta-rated filter or approved barrier |
| Media retention protection | The system shall prevent media migration into the owner’s reservoir |
| Flow measurement | Active media flow shall be measured and recorded |
| Totalized volume | Treated volume shall be recorded for performance verification |
| Differential pressure | DP shall be monitored across filters and media vessels |
| Bypass control | Bypass shall be controlled, documented, and not used to inflate treatment claims |
| Leak containment | Skids shall include drip trays, spill kits, and suitable containment |
| Hose management | Hoses shall be pressure rated, clean, capped, tagged, and compatible with the oil |
| Electrical compliance | Motors and controls shall match site voltage and hazardous-area requirements |
| Grounding/bonding | Required where static or hazardous-area risk exists |
| Sampling points | Upstream, downstream, and reservoir sampling points shall be available |
| Cleanliness certification | Equipment shall arrive flushed, clean, and protected from cross-contamination |
The tender should require certified vessels, corrosion-resistant construction, drain-down arrangements, differential pressure gauges, bypass systems, adjustable flow through active media, inline flow meters, outlet protection, sampling ports, and technical training as part of the service package.
13. Specify final filters by beta ratio, not marketing micron rating
Nominal micron ratings are weak. The tender should require beta-rated filtration.
Recommended wording:
Final mechanical filters shall be specified by micron rating and beta ratio. Nominal filter ratings shall not be accepted as the sole proof of filtration efficiency.
A practical tender requirement may state:
Final filtration shall be selected to achieve the owner’s ISO cleanliness target and shall have documented beta efficiency, dirt-holding capacity, and differential pressure change-out criteria.
The contractor should disclose:
| Filter detail | Required disclosure |
|---|---|
| Micron rating | Absolute or beta-rated |
| Beta ratio | Efficiency at stated micron size |
| Dirt-holding capacity | Required for clean-up planning |
| Surface area | Helps predict service life |
| Collapse/burst rating | Mechanical protection |
| Seal material | Compatibility |
| Change-out DP | Example: site-approved limit such as 25 psi / 172 kPa |
| Availability | Local stock and lead time |
| Cost | Unit price and forecast consumption |
The contractor must not be allowed to win with low day rates and then recover margin through excessive filter consumption.
14. Require fluid segregation and cross-contamination control
A large outsourced contractor may move the same equipment between turbines, compressors, hydraulic systems, and sites. This is a contamination risk.
Tender clause:
The contractor shall maintain fluid segregation procedures to prevent cross-contamination between mineral oils, synthetic fluids, phosphate ester fluids, hydraulic oils, gear oils, and incompatible lubricant families.
The contractor should provide:
| Control | Requirement |
|---|---|
| Dedicated hose sets | By oil family where required |
| Hose caps and plugs | Mandatory during transport |
| Pre-mobilization flush certificate | Required before connection |
| Compatibility matrix | Required for all fluids handled |
| Previous-service declaration | Last oil type used in equipment |
| Sample of equipment flush oil | Required for high-criticality systems |
| Cleanliness certificate | Before connection to critical reservoirs |
| Quarantine procedure | For suspected contamination |
Khash rule:
A dirty contractor skid can import the problem you hired it to remove.
15. Define service levels and response times
For power generation and oil and gas operations, time matters. The tender should include service levels for planned and emergency work.
Example SLA table:
| Service event | Response requirement |
|---|---|
| Routine planned service | Mobilize as per monthly/quarterly schedule |
| Critical alarm oil sample | Technical review within 24–48 hours after lab result |
| High water ingress | Mobilization within agreed emergency window |
| High particle count after maintenance | Mobilization before unit restart where required |
| Varnish-related control issue | Immediate technical review and priority mobilization |
| Forced outage support | 24/7 call-out availability |
| Emergency equipment | Dedicated or guaranteed access to suitable unit |
| Report submission | Within agreed period after demobilization |
| Corrective action plan | Within agreed period after failed KPI |
For multi-site operators, the tender should include regional response capability. A contractor claiming national or regional support must show where equipment, spares, media, technicians, and supervisors are actually located.
16. Separate dedicated units from rotating mobile services
For critical turbines and compressors, a dedicated continuous unit may be better than a rotating service model. A mobile contractor can restore a reservoir and then move to another machine, but varnish potential can return if oxidation products continue to accumulate and no continuous control remains in place.
Tender strategy:
| Service model | Best use | Risk |
|---|---|---|
| Dedicated continuous unit | Critical turbines, recurring varnish, high-value compressors | Higher fixed cost |
| Mobile periodic treatment | Medium-critical assets with stable oil | Risk between service intervals |
| Emergency-only service | Rare contamination events | No prevention |
| Campaign treatment | Outage or fleet-wide restoration | Requires strong scheduling |
| Hybrid model | Dedicated for critical assets, mobile for balance of plant | Best for large companies |
The tender should require the contractor to recommend the operating philosophy per asset and justify it using oil analysis, asset criticality, reservoir volume, and failure history.
Khash rule:
Rotating equipment may be acceptable. Rotating protection on a critical turbine is a risk decision.
17. Build a clear sampling and monitoring plan
The tender must define who samples, where samples are taken, how bottles are prepared, which laboratory is used, and who interprets the results.
Minimum sampling requirements:
| Requirement | Tender expectation |
|---|---|
| Fixed sample points | Same location every time |
| Live-zone sampling | Avoid dead-leg or drain-only samples |
| Bottle control | Clean, sealed, correct bottle type |
| Flushing volume | Defined before sample capture |
| Chain-of-custody | Required |
| Pre-treatment sample | Mandatory |
| Post-treatment sample | Mandatory |
| Upstream/downstream sample | Required for performance verification |
| Frequency | Based on risk and treatment phase |
| Independent lab option | Owner may require independent verification |
| Data ownership | Owner owns all oil analysis data |
The contractor should provide a monthly dashboard for each machine:
| Dashboard item | Why it matters |
|---|---|
| MPC trend | Varnish control |
| ISO cleanliness trend | Particle control |
| Water trend | Ingress or dehydration status |
| Acid number trend | Oxidation and acid formation |
| Antioxidant trend | Remaining oil life |
| Treated volume | Confirms actual work done |
| Turnovers per day | Confirms sizing |
| Filter DP trend | Predicts filter change |
| Consumables used | Cost control |
| Recommendations | Reliability actions |
The dashboard should not only display numbers. It should interpret risk and specify actions.
18. Demand technical competence, not only manpower
The tender should require both field capability and lubrication expertise. The contractor should provide CVs, certifications, and experience for personnel who will supervise and execute the work.
Minimum competency expectations:
| Role | Required competence |
|---|---|
| Contract technical lead | Lubrication engineering, turbomachinery oil analysis, varnish control |
| Site supervisor | Permit-to-work, turbine/compressor oil systems, HSE leadership |
| Filtration technician | Equipment operation, hose handling, sampling, DP monitoring |
| Oil analysis specialist | Interpretation of MPC, AN, water, ISO, RULER, FTIR, filterability |
| HSE representative | Site safety compliance, spill response, risk assessment |
| Emergency coordinator | Mobilization planning and 24/7 response |
The bidder should submit:
| Document | Purpose |
|---|---|
| Method statement | Shows how work will be executed |
| Risk assessment | Shows hazards and controls |
| Equipment datasheets | Verifies capability |
| Calibration certificates | Validates instruments |
| Hose certificates | Confirms pressure and compatibility |
| Filter/media datasheets | Confirms technical performance |
| Oil compatibility statement | Protects the lubricant |
| Waste disposal plan | Protects the owner environmentally |
| Case histories | Shows relevant experience |
| Training plan | Builds site capability |
19. Make HSE and environmental compliance part of technical scoring
Oil filtration around operating turbomachinery is not low-risk work. It involves hot oil, rotating equipment, pressurized hoses, electrical equipment, possible hazardous areas, slip hazards, spill risk, and critical machinery interfaces.
The tender should require:
| HSE topic | Tender requirement |
|---|---|
| Permit-to-work | Contractor shall comply with site PTW system |
| LOTO/interface control | Required before connection or disconnection |
| Pressure safety | Hoses, vessels, filters, and fittings rated and certified |
| Spill prevention | Bunding, drip trays, absorbents, emergency response |
| Static control | Bonding and grounding where required |
| Hot oil handling | PPE, burn prevention, hose routing |
| Hazardous area compliance | Equipment suitable for area classification |
| Waste management | Used oil, filters, media, and contaminated absorbents handled legally |
| Manual handling | Lifting plans for heavy filters/media |
| Simultaneous operations | SIMOPS review near live process units |
| Offshore/site access | Training, medicals, inductions, certifications as applicable |
The tender should treat HSE non-compliance as a technical disqualification, not a commercial clarification.
20. Require a transparent commercial model
Outsourced oil filtration contracts often become expensive because the tender evaluates only day rate. The real cost is equipment rental, mobilization, consumables, analysis, media, waiting time, travel, emergency call-out, waste, overtime, and repeat visits.
A strong tender should request pricing in these categories:
| Price item | Required bid format |
|---|---|
| Mobilization/demobilization | Per site or per campaign |
| Equipment rental | Daily, weekly, monthly, and dedicated annual rate |
| Technician rate | Normal time, overtime, weekend, emergency |
| Supervisor/engineer rate | Separate line item |
| Active media | Unit cost, volume, expected life |
| Mechanical filters | Unit cost, beta rating, expected life |
| Dehydration consumables | If applicable |
| Oil analysis | Per sample and by test slate |
| Waste disposal | Per kg, per drum, or per job |
| Standby time | Clear rate |
| Emergency call-out | Clear multiplier |
| Reporting | Included or priced |
| Training | Included or priced |
| Performance guarantee | Included or separately priced |
The tender should require a five-year and ten-year cost model, especially where active media, additives, and repeat consumables are involved. Total ownership cost, laboratory verification, warranty, expert support, chemical dependency, and consumable assumptions should be visible before award.
Khash rule:
The lowest day rate is often the most expensive oil program.
21. Control chemical additives tightly
No contractor should be allowed to introduce additives, cleaners, boosters, deposit solvents, or chemical supplements without written approval.
Tender clause:
The contractor shall not dose any chemical additive into the owner’s lubricant without written approval from the owner’s rotating equipment authority, lubricant supplier, and relevant machinery stakeholder. Any proposed additive shall be separately priced and supported by compatibility, purpose, dosage, risk, and post-treatment analysis.
The bid must disclose whether any chemical is required to meet the claimed result.
| Chemical disclosure item | Required answer |
|---|---|
| Is chemical dosing required? | Yes/no |
| Is it optional or mandatory? | State clearly |
| What is the purpose? | Varnish dissolving, antioxidant replenishment, cleaning, etc. |
| What is the dose rate? | Per litre or reservoir |
| What is the annual cost? | Required |
| Does it affect warranty? | Written confirmation |
| Does it affect demulsibility, air release, foaming, or seals? | Evidence required |
| How is success measured? | Lab test required |
If a chemical is required for performance, it must be included in the base commercial evaluation.
22. Define when filtration is not enough
The tender should avoid pretending that every oil problem is solved by filtration. Sometimes the correct answer is filtration plus dehydration. Sometimes it is varnish removal plus bleed-and-feed. Sometimes it is oil replacement after system clean-up. Sometimes it is a full reservoir clean and flush.
The contractor should be required to recommend one of four routes:
| Route | When used |
|---|---|
| Maintain | Oil is healthy; keep it clean |
| Restore | Oil is degraded but recoverable |
| Stabilize then replace | Oil is too depleted but machine must be protected until outage |
| Replace and protect | Oil is no longer fit for long-term service |
Tender clause:
The contractor shall identify oil that is outside practical restoration limits and shall recommend the most technically and commercially responsible route, including restoration, bleed-and-feed, partial replacement, full replacement, flushing, or continued monitoring.
This protects the owner from paying for endless filtration when the oil chemistry requires a different strategy.
23. Include performance guarantee and exclusions
A service contractor should provide performance guarantees, but the guarantee must be technically fair.
Example performance guarantee:
Subject to accurate baseline data, correct equipment selection, uninterrupted operation, approved consumable replacement, and no abnormal new contamination event, the contractor shall reduce and maintain the specified oil parameters within the agreed target limits.
Potential guaranteed targets:
| Parameter | Example guarantee |
|---|---|
| MPC | Reduce to <15 ΔE within agreed restoration period |
| ISO cleanliness | Achieve OEM/site target within agreed hours or days |
| Water | Reduce below agreed ppm or saturation limit |
| Acid number | Reduce or stabilize within agreed range where treatment is applicable |
| Filter DP | Maintain within safe operating range |
| Reporting | Submit reports within agreed time |
| Availability | Maintain service equipment availability above agreed SLA |
| Emergency response | Mobilize within contractual window |
Reasonable exclusions should also be defined:
| Exclusion | Example |
|---|---|
| New contamination event | Water ingress, wrong oil addition, process leak |
| Mechanical defect | Failed cooler, leaking seal, damaged breather |
| Inaccessible system | No safe connection point or permit restriction |
| Oil beyond agreed condition | Severe additive depletion or abnormal acid condition not declared |
| Owner delay | Equipment stopped due to site restrictions |
| Unauthorized chemical addition | Third-party dosing or oil mixing |
| Incorrect baseline data | Misdeclared reservoir volume or fluid type |
The tender should not allow vague guarantees. Every guarantee must have method, target, timeline, and measurement protocol.
24. Use a weighted tender evaluation matrix
For critical turbomachinery, technical scoring should dominate price. A practical evaluation matrix is:
| Evaluation category | Weight |
|---|---|
| Technical method and ability to remove particles, water, acids, and soluble varnish precursors | 20% |
| Asset-specific sizing, flow calculations, and treatment philosophy | 15% |
| Oil analysis program, sampling control, and KPI measurement | 15% |
| HSE, hazardous-area compliance, waste handling, and site safety | 15% |
| Contractor experience, personnel competence, and references | 10% |
| Equipment quality, certification, redundancy, and availability | 10% |
| Commercial transparency and total cost of ownership | 10% |
| Reporting, digital dashboard, training, and governance | 5% |
For high-criticality turbines and compressors, technical non-compliance should override price. A low-cost bidder who cannot remove dissolved varnish, cannot prove flow through active media, cannot manage water, cannot work safely in hazardous areas, or cannot provide oil analysis interpretation should not pass technical evaluation.
25. Include red flags in the clarification stage
The tender team should challenge any bidder who says:
| Red flag | Why it matters |
|---|---|
| “We provide filtration for all oil problems.” | Different failure modes need different technologies |
| “Our pump is 30 L/min.” | Pump flow is not proof of active treatment flow |
| “We remove varnish by cooling the oil.” | This may only remove insoluble material |
| “We do not need baseline oil analysis.” | No baseline means no measurable success |
| “We can use the same hoses for all oils.” | Cross-contamination risk |
| “Our filter is 1 micron nominal.” | Nominal rating is weak without beta ratio |
| “Chemical additive is recommended but not included.” | Hidden lifecycle cost |
| “Media lasts one year in all conditions.” | High acid or high varnish oil may exhaust media quickly |
| “On-site patch test proves varnish removal.” | MPC acceptance needs controlled sample preparation |
| “Waste disposal is by others.” | Environmental responsibility gap |
| “No local spares are required.” | Emergency response risk |
| “We will provide reports when requested.” | Reporting must be scheduled and contractual |
Khash rule:
The tender should expose weak assumptions before the plant exposes weak performance.
26. Sample tender clause
A strong outsourced-service clause can be written as follows:
The contractor shall provide turbomachinery lubricant conditioning services for the owner’s gas turbines, steam turbines, turbo-compressors, hydraulic control systems, gearboxes, and associated oil reservoirs. The service shall include routine oil filtration, varnish precursor removal, particulate control, dehydration, acid-control support, oil analysis, condition monitoring, reporting, emergency contamination response, and technical recommendations.
The contractor shall achieve measurable oil-condition targets for each asset. These targets shall include, where applicable, MPC varnish potential, ISO cleanliness, water content, acid number, antioxidant condition, filterability, and any OEM or owner-specific lubricant limits.
The contractor shall provide equipment capable of operating in closed-loop service on live or offline reservoirs as approved by the owner. Equipment shall include certified pressure-containing components, beta-rated final filters, active treatment media where required, flow meters, treated-volume totalizers, differential pressure indicators, sampling points, containment, compatible hoses, and media-retention protection.
For varnish control, the contractor shall demonstrate the ability to remove dissolved varnish-forming oxidation products during normal oil operating temperature. Treatment methods relying solely on cooling the oil to precipitate varnish shall not be accepted as the primary varnish-control method.
The contractor shall submit an asset-specific treatment plan showing reservoir volume, oil type, current oil condition, treatment objective, active media flow rate, total pump flow, expected turnovers per day, consumables forecast, sampling frequency, acceptance criteria, and estimated restoration period.
The contractor shall not introduce chemical additives, cleaners, boosters, or supplementary additive packages without written owner approval. Any proposed chemical shall be separately priced and supported by compatibility evidence.
The contractor shall provide a transparent five-year and ten-year commercial model, including equipment rental, mobilization, manpower, active media, mechanical filters, oil analysis, waste disposal, emergency call-out, reporting, training, and all optional consumables.
27. The Khash conclusion
A large power plant or oil and gas company should tender turbomachinery oil filtration as a reliability service, not a maintenance activity.
The tender must force the contractor to prove:
- The right technology is selected for each contamination mode.
- Dissolved varnish precursors can be removed during normal operation.
- Flow is calculated by active media treatment, not pump nameplate capacity.
- Oil analysis controls the service, not guesswork.
- Additive health is protected.
- Water, acid, varnish, and particles are all addressed separately.
- HSE and environmental controls are engineered into the job.
- The commercial model exposes the real cost of consumables and call-outs.
- Performance is guaranteed by measurable KPIs.
- Reporting converts filtration activity into reliability intelligence.
The final tender message should be clear:
Do not hire a contractor to circulate oil. Hire a contractor to defend turbomachinery reliability.
— Khash
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