Shaft Vibration Bearing Vibration  

  Units of µm or similar Units of mm/s or similar    e.g. measured with proximity probes e.g. measured with acceleromters  

  More Details... More Details...  

 

Follow the links above to our more detailed explanations on using ISO 7919 and ISO 10816 to evaluate machine vibration, including vibration limits and

which parts of the standards to apply.

 

ApplicabilityIf you are considering installing vibration transducers and monitoring on a machine you should beware of the difference between measurement on rotating and

non-rotating parts, in particular how the machine’sbearing and support stiffness’s affect the choice of location and method of measurement.

As a general rule, machines with rolling-element bearings tend to have high bearing stiffness and are better suited to bearing vibration measurement on the

pedestal (accelerometers on non-rotating parts).Conversely, machines with fluid-film bearings on soft pedastals are better suited to shaft vibration

measurement (proximity probes on rotating parts).

If you need assistance contact us here and we can advise you.

 

For large and critical turbomachinery our general recommendation is to have at least one a bearing and a one shaft vibration measurement installed at

each bearing, since this covers most adequately both the vibration behaviour in the bearing (relative vibration, orbits, shaft centreline…) as well as exterior

fixed body vibrations (component resonances, shaft rubbing, flow effects, gear impacts, looseness, misalignment…).

 

 

Recommended StandardsThe following standards are recommended by Turbo Monitoring for all turbomachinery operators:

Standard Title

API 612 Petroleum, Petrochemical and Natural Gas Industries-Steam Turbines-Special-

purpose Applications

 

ISO 1925 Balancing Vocabulary

 

ISO 1940-1

ISO 1940-2

Balance Quality Requirements for Rotors in a Constant (Rigid) State

      Part 1: Specification and Verification of Balance Tolerances

      Part 2: Balance Errrors

 

ISO 2041 Mechanical Vibration, Shock and Condition Monitoring - Vocabulary

 

ISO 5348 Mechanical mounting of accelerometers

 

ISO 7919-1

ISO 7919-2

ISO 7919-3

ISO 7919-4

ISO 7919-5

Evaulation of Machine Vibration by Measurements on Rotating Shafts

      Part 1: General Guidelines

      Part 2: Steam Turbines and Generators >50 MW with speeds of 1500 rpm, 1800

rpm, 3000 rpm, 3600 rpm

      Part 3: Industrial Machines

      Part 4: Gas Turbines

      Part 5: Hydroelectric and Pumps

 

ISO 10816-1 

ISO 10816-2 

ISO 10816-3  

ISO 10816-4 

ISO 10816-5 

ISO 10816-6

ISO 10816-7

Mechanical Vibration

      Part 1: General Guidelines

      Part 2: Steam Turbines and Generators >50 MW with speeds of 1500 rpm, 1800

rpm, 3000 rpm, 3600 rpm

      Part 3: Industrial Machines

      Part 4: Gas Turbine Sets

      Part 5: Hydroelectric and Pumping Plants

      Part 6: Reciprocating Machines above 100 kW

      Part 7: Rotordynamic Pumps

 

ISO 11342 Methods and Criteria for the Mechanical Balancing of Flexible Rotors

 

ISO 13373 Condition monitoring and diagnostics of machines -- Vibration condition monitoring

 

ISO 13374 Condition monitoring and diagnostics of machines -- Data processing,

communication and presentation

 

ISO 13379 Condition monitoring and diagnostics of machines -- Data interpretation and

diagnostics techniques

 

ISO 18436 Condition monitoring and diagnostics of machines -- Requirements for training and

certification of personnel

 

 

 

Other Standards Standard TitleVDI 3839 Instructions on Measuring and Interpreting the Vibrations of Machines

Vibration Measurements

Vibration MeasurementsTurbo Monitoring is an independent company specialiazed in vibration and damage analyses ofturbomachinery such as gas turbines, steam turbines, and

other fast-rotating machinery.

 

Turbo Monitoring's vibration measurement services provide an independent assessment of a machine's condition according to our extensive experience of

vibration diagnostics and investigating operating problems on turbomachinery. Our assessments use vibration data collected with our own diagnostics

equipment, take into account the historical vibration data of the machine and classify the machine condition according to international standards such as ISO

10816 and ISO 7919.

 

Within our assessments we diagnose any operating problems, provide recommendations on countermeasures and document the machine condition for

future reference.

Typical Operating Problems:

Unbalance Rubbing Bearing Looseness Foundation Changes Misalignment Shaft Cracks Blade Fractures Electro-Static Discharge

We specialize in providing accurate and reliable assessments, helping you identify damage early and avoid unnecessary shutdowns and thus reducing

your damage + maintenance costs and increasing your machine availability.

We are independent from all OEM's including turbine manufacturers and monitoring equipment suppliers. This means we have no confict of interest in our

assessment results; we have no interest in over-interpreting results to obtain overhaul contracts, replace your turbine, or sell vibration analysis equipment.

The exact nature of the regular measurements depends on the equipment configuration available onsite and customer wishes, but typically involves Turbo

Monitoring installing our measurement equipment for the duration of a one or two day measurement. An immediate assessment is made available directly

at the time of the measurement, and the full assessment provided later includes our recommendations, an officially confirmed classification of the vibration

level and full documentation.

Where necessary we also offer our vibration measurements as an alternative to our continuous monitoring contracts, whereby detailed measurements are

conducted on regular basis e.g. monthly or yearly. We then use comparisons between the measurements to determine any long-term trends and

diagnose any developing faults. We can also guarantee the availability of expert diagnostic support in the case of operating problems or general enquiries, thus

providing the benefits of regular measurement and diagnostics with the guaranteed availability of emergency support when needed.

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Key highlights of our vibration measurement service include:

Diagnose operating problems Recommendations for countermeasures Evaluation according to standards e.g. ISO 7919 & 10816 Identify damage early Full diagnostics reports Trend monitoring over historic measurements Reports available online anywhere in the world via web portal Access to our diagnostics engineers for enquiries Configuration of operator measurement equipment Onsite diagnostics during emergencies

This steam turbine shaftwas not continuously

monitored

The start-up screen for online vibration monitoring

Our assessments provide a very valuable health-check on the machine at specific points in time and detailed diagnostics on any operating problems, helping to

avoid damage and plan maintenance.

We are experienced in serving customers worldwide and welcome enquires from all turbomachinery operators or suppliers.

For more information and to request your free consultation use the contact us form here or:

Email Us

Call Now: +49 89 5526 2156

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Call: +49 (0) 89 5526 2156

Email: info@turbomonitoring.com

Fax No.: +49 (0) 89 3802 8284

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Damage Investigations

Damage InvestigationsMachinery damage can happen at any time and to any machine. According to insurance calculations the chance of a catastrophic loss equal to the complete

plant value is typically greater than 1% for each machine, every year.

Once an operating problem or damage does occur it is essential to investigate the cause of damage as fully as possible to ensure that no further damage is

done, that future damages can be avoided and that the current repair procedure can be optimized. Damage investigations such as these are not just useful for

machine operators but also serve the interests of the original manufacturer, insurance companies and third-party suppliers e.g. packagers and overhaul

companies.

Turbo Monitoring offers independent damage investigation services that investigate vibration problems on turbomachinery. Our expertise in this area

includes diagnosing live problems during operation as well as assessing vibration data and machine condition post-damage.

Our services are applicable to all stakeholders in helping them understand the cause of damage, their liability and recommending measures for future risk

mitigation.

Typical Damage Investigations Include

High Vibration Unbalance Shaft Cracks Foundation Changes Blade Fractures

Shaft Bending & Rubbing Component Resonance and Modal Analysis Overhaul & Maintenance Errors Gearbox Irregularities Bearing Instability

We are independent from turbine manufacturers and other suppliers, which is key to our ability to deliverunbiased analysis results. This is particularly

important in damage investigations, where there are often conflicting parties involved and the independent credibility of investigation results is very important.

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Our independent results are trusted by all the major manufacturers, operators and insurance companies and we work hard to maintain good working-

relationships with the key industry players. As independent experts our role often includes mediating on technical issuesbetween all stakeholders.

Our expert knowledge and good industry contacts also mean we have first-rate knowledge of damage trends within the turbomachinery industry. This means

we can quickly determine if a machine is suffering from a known serial fault and we can quickly advise you of the best remedial action with regards to repairs

and suppliers.

Furthermore, if your machine is covered by one of our continuous condition monitoring or scheduled measurement contracts we can quickly inspect the

machine’s long-term trend data to determine the exact start-time of the damage occurrence, correlate this with the maintenance schedule and the overall plant

condition and compare the current damaged operating condition with previous analysis measurement results to determine the exact nature and timing of the

machine degradation. This leads to an even quicker diagnosis and shorter shutdown times.

Our service contracts are flexible to suit your needs and expectations. The greatest benefit in maintenance costs and machine availability are obtained with

long-term monitoring, however short-term monitoring from one month onwards is also readily available.

For more information and to request your free consultation use the contact us form here or 

call: +49 89 5526 2156

Contact Us

Questions?

Interested in a Free Consultation?

Contact us now:

Call +49 89 5526 2156

Email: info@turbomonitoring.com

Damaged steam turbineshrouding

Investigation of a natural frequency resonance on a

hydro-electric turbinerunner

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Acceptance Testing

Acceptance TestingTurbomachinery is among the most capital-intensive and operation-critical equipment in the world. It’s therefore easy to understand that an operators most

important concern when acquiring or maintaining this equipment is to ensure quality control and safety from their new equipment and their suppliers.

Whether this means that individual design specifications and standards are met or that the complete machine is commissioned safely and according to contract,

operators face a diverse ranges of quality-control and safety issues which are often outside their own usual expertise.

Turbo Monitoring offers support to operators and manufacturers during this process with their expert adviceon quality and safety issues and independent

verification of inspection or measurement results.

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We have significant experience in serving clients involved in the acquisition and operation of turbomachinery and offer our support on a case-by-case basis.

Examples of typical areas where we offer our technical support and measurement services include:

New Commissioning Measurements Overhaul / Repairs – e.g. Before and After Measurements Overspeed Testing

Component Balancing Design Verification According to Standards – e.g. API 611/ 612 Rotordynamic Layout – e.g. Resonance separation margins

Acceptance testing is a wide-ranging field within machinery diagnostics and client requirements strongly depend on the specific circumstances. For more

information and to discuss your specific needs please contact us here or call +49 89 5526 2156

Contact Us

Questions?

Interested in a Free Consultation?

Contact us now:

Call +49 89 5526 2156

Email: info@turbomonitoring.com

Manufacturer overspeed test procedures vary greatly 

and need to be monitored

            Example: Vibration Measurements Before and After Overhaul

Steam turbines require regular overhauls to maintain efficiency and guard against undetected machine wear. These overhauls can be a small scheduled servicing of the machine or they can be extensive and include large upgrades to entire sections of the turbine. Whatever the size or reason for the overhaul one thing must be guaranteed – when the machine restarts it must run smoothly.

Turbo Monitoring regularly conducts vibration diagnostics before and after overhauls to help with the repair planning and ensure quality-assurance after restarting. For example, a first measurement before the overhaul can determine which areas of the machine need to be re-aligned during the overhaul, which bearings may need particular attention and what the overall vibration signature of the machine is. This helps immensely with the repair planning i.e. which components to order ready in stock and predicting how much time the necessary repairs may require. Likewise, a second measurement after the overhaul can check on the quality of the repair work and assist in diagnosing any problems should a fault appear. For example, checking that new bearing sleeves are properly loaded, that new turbine sections are aligned and balanced correctly, and being able to trace and diagnosis new vibration amplitude changes.

AuxiliaryPlant Monitoring

Auxiliary Plant MonitoringAuxiliary plant machinery is no less prone to failure and is equally suitable to benefit from machinery diagnostics as larger machines. Due to their lower

criticality and easier maintenance however these machines are often best served by a lower-intensity monitoring regime with a higher degree of automation.

Typical auxiliary plant machinery suitable for vibration monitoring include:

Feedwater Pumps Cooling Fans Electrical Motors Small Industrial Steam Turbines Steam Expanders Compressors Steam-Driven Pumps Small Gearboxes

 

Turbo Monitoring offers solutions for cost-effective monitoring of auxiliary machinery either with customized equipment installations and remote diagnostics or

with individual measurements. Both solutions offer online report viewing and guaranteed availability of diagnostics expertise.

Our monitoring regimes can enable damages to be predicted which therefore allows for maintenance planning in advance. The monitoring also allows new

fault detection, machine degradation assessment and recommendations to remediate operating problems.

As with all our services we use our expertise in turbomachinery diagnostics to deliver independent andreliable services which helps our clients reduce

their maintenance costs and increase their machine availability.

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We have significant experience in serving clients involved in the acquisition and operation of turbomachinery and offer our support on a case-by-case basis.

Key highlights of our auxiliary monitoring solutions include:

Fault monitoring and damage prediction Regular evaluation according to standards e.g. ISO Regular diagnostics reports Simultaneous monitoring of multiple auxiliary machines Mobile access to live analysis results Long-term trend analyses Unlimited client enquiries to diagnostics engineers Reports available online anywhere in the world via web portal Optional guaranteed availability of onsite diagnostics during emergencies

Gearbox tooth fracturing

 

 

Our service contracts areflexible to suit your needs and expectations, and in the case of new equipment installations we can help with equipment

financing as part of the service contract.

For more information and to request your free consultation use the contact us form here or 

call: +49 89 5526 2156