ROTATING MACHINERY

ENGINEERING SERVICES

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RotMach s.r.o.Koněvova 2660/141, 130 00 Praha 3+420 602 573 975info@rotmach.comlinkedin.com/company/rotmach

www.rotmach.com

MACHINERY

DYNAMICS

NUMERICAL

SIMULATIONS

METAL

MATERIALS

DESIGNING

SERVICES

CENTRIFUGAL

COMPRESSORS

RESEARCH

AND

DEVELOPMENT

R O TAT I N G M A C H I N E RY

E N G I N E E R I N G S E RV I C E S

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CENTRIFUGAL

COMPRESSORSWe provide engineering services in Centrifugalcompressors and Blowers, Turbocompressors andCompressor units. We focus on industrial centrifugalcompressors, based on API617– single shaft & integrallygeared.

We provide also solutions for an integration ofCentrifugal compressors and their accessories intonew/existing technology process. It can be also for othercompressor types – reciprocating compressor (piston) orscrew compressor

BROWNFIELD PROJECTS

▪ Your centrifugal compressor is running well, but you want to know, if you could/should revamp it to achieve better operation parameters (higher efficiency, flow, pressure ratio).

▪ You want to operate the compressor by other gas parameters. And you want to know what would be the estimated revamp scope.

▪ Your compressor is approaching general overhaul. You would consider a modernization on this occasion and you need to evaluate what are the benefits of various options.

GREENFIELD PROJECTS

▪ You are planning to build new process plant and you need a support with compressor RFQ establishing.

▪ You work in EPC, which is preparing a new plant project, and you need a support with centrifugal compressor selection/design.

▪ You have received several compressor proposals and you need to compare and evaluate them.

SERVICES

▪ Feed study support, including price estimations (new unit or revamp of existing machines)▪ Performance & efficiency upgrades study (revamp)▪ Support with compressor tenders▪ Evaluation of OEMs proposals▪ Project management support

▪ Compressor concept & detailed design▪ Thermodynamic design▪ P&ID system basic design – gas, seals, oil, machine monitoring system▪ Impeller upgrades study, Seal upgrades, Bearing upgrades, Coupling upgrades▪ Compressor rotor dynamics, vibration (calculation, analyze, evaluation)

▪ Single shaft / Integrally geared basic design concepts▪ Compressor and gearbox mechanical loss predictions, gear rating▪ Compressor impeller design & strength calculation

▪ Research & development▪ Centrifugal compressors trainings, education

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EXPERIMENTAL AND R&D

ACTIVITIES

▪ Concept and detailed design of test beds and

experimental stands for validation of rotor

dynamics and bearing properties

▪ Development and implementation of new

analysis methods and procedures

▪ High speed motor – blower (18 000RPM,

100kW) with aero bearings available for testing,

research and development activities

▪ Cooperation on R&D and grant projects

COMPLETE MACHINES NUMERICAL ANALYSIS

▪ FEM analysis (ANSYS Mechanical)▪ Complex spatial dynamics evaluation

▪ Modelling and analysis of complete structures: rotor – bearings – frame

▪ Separate machines or complete drivetrain including coupling connections

▪ Modal analysis including damping and Coriolis effect

- Campbell, Log-dec diagram

▪ Harmonic analysis - damped unbalanced response, relative and absolute vibrations (displacement, speed, acceleration)

- Bode diagram

TORSIONAL ROTOR DYNAMICS

▪ According to API612/613/618/684 or to customer standard

▪ Isolated rotor or complete drivetrain analysis

▪ Campbell diagram, mode shapes

LATERAL ROTOR DYNAMICS

▪ According to API612/613/618/684 or to customer standard

▪ Isolated rotor or complete drivetrain analysis

▪ Eigen mode shapes and frequencies▪ Damped unbalanced response analysis▪ Stability analysis▪ Gas flow effect on stability (Alfords)

▪ Campbell diagram▪ Logarithmic decrement diagram

(stability)▪ Undamped critical speed map▪ Bode diagrams

VIBRODIAGNOSTIC

MEASUREMENT EVALUATION

▪ Machinery vibrations measurement evaluation and assessment, we specialize in relative rotor vibrations

▪ Rotor dynamics measurement and simulation identification

▪ Analysis of Bode diagram, orbit, frequency spectrum, etc.

▪ Recommendations, methodology and best-practice limits for low and high-speed rotor balancing

▪ Proposals and corrective actions to suppress vibration levels of existing rotating machinery

- optimization of hydrodynamic bearing geometry

- suppressing rotor instabilities (damper seals applications, etc.)

ROTOR-BEARING SYSTEMS

▪ Bearing type selection, review and optimization of bearing supports (supporting structures)

▪ Resonance and instability suppressions▪ Hydrodynamic and roller bearing dynamic

properties approximation

ROTOR DYNAMICS AND

MACHINERY VIBRATIONSWe perform lateral and torsional dynamics analysis of

isolated rotors and complete drivetrains including bearingsupport structures, housings and frames. Undamped, dampedanalysis, damped unbalanced response, stability. We followstandards API 612/613/617/684 or according to customerstandards. We asses machinery vibrations.

Our analysis and calculations are based on many years ofpractical experience and experimental research activities infield of rotor dynamics and rotating machinery.

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NUMERICAL

SIMULATIONS

We provide structural analysis of rotating and nonrotatingmachinery in the ANSYS Mechanical environment. Wespecialize in dynamic modal and harmonic analysisrelated to rotating machinery vibrations.

We use solver ANSYS CFX to simulate fluid flow. Our fieldof expertise are especially calculations of centrifugalcompressors but we also simulate other rotating and non-rotating machinery and equipment.

FEM STRUCTURAL SIMULATIONSCFD SIMULATIONS

▪ Development of a new design or

flow path upgrade for existing

machines

▪ Ideal or real gas properties

▪ Steady-state and transient

simulations

▪ Calculation of machine

operating performance,

stage’s full characteristic

curves for thermodynamic

design (compressors, pumps,

turbines…)

▪ Identification of critical

regions, flow path

optimization and pressure

loss calculation

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▪ Dynamic analysis of machines and

drivetrains, including damping

▪ Modal and harmonic response

▪ Machines calculation including

casing, foundation, etc.

▪ Dynamic matrix approximation for

both roller and hydrodynamic

bearings

▪ Campbell and Bode diagram, stability

▪ Static linear and nonlinear analysis

of rotating and nonrotating

structures and assemblies

▪ Impeller design verification including

material‘s plasticity region

▪ Foundation stiffnesses for the

rotordynamics analysis, machine

housing and frame optimization

▪ Contact analysis, complex

mechanisms and other simulations

METAL MATERIALS

We offer technical support and consulting for metalmaterial selection, not only for rotating machinery andrelated technologies. We provide professional know-howand practical experiences with the right choice ofmaterials for corrosive and aggressive environment or forhigh and low temperatures. We have experiences withnon-ferrous material’s applications, such as titanium andnickel alloys.

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MACHINE’S FAILURE ASSESSMENT

MATERIAL SELECTION

▪ Recommendations for

material selection for specific

applications

▪ Corrosion resistance in

aggressive environments

(H2S, wet CO2, H2, etc.)

▪ Material design for:

- High, low or cryogenic

temperatures

MATERIALS FOR ROTATING

MACHINERY

▪ Recommendations for material

selection of rotating machinery parts

▪ Material compliance to international

standards API, ASTM, AMS, ČSN, EN,

ISO

▪ Assessment selected materials

suitability for the existing and new

machinery

▪ Non-ferrous metal materials:

titanium and nickel alloys, etc.

MATERIAL TESTS AND RESULTS

EVALUATION

▪ Providing material tests in external

certified laboratories

▪ Fractographic analysis

▪ Corrosion resistance tests in the

autoclave

▪ Assessment of material quality based

on the supplier’s material attest

▪ Methodology for assessment of

supplier material‘s quality

▪ Investigating machine failures associated with material failure caused by corrosive attack or poor quality of semi-product material

▪ Material corrosion loss

▪ Machine failure due to

inadequate material

mechanical properties

BASIC PARAMETERS

▪ EM power: 100 kW

▪ Max speed: 18 260 RPM

▪ Impeller: 3D type

▪ Impeller diam.: 285 mm

▪ Control: VFD

▪ Mass: 1 000kg

▪ Dimensions: 1 200 x 1 100 x 1 000 mm

EXPERIMENTAL HIGH-SPEED

BLOWER WITH AERODYNAMIC

BEARINGS

▪ Machine offers relatively compactand low operating cost base fordevelopment of next generationturbomachinery. We are looking for apartner and we offer cooperation inR&D based on this technology,mainly in the following areas:

- Design and validation of radial impellers and flow path, measurement and control of centrifugal compressors and blowers

-Applications of aerodynamic or aerostatic bearings

- Other related R&D challenges

▪ One stage centrifugal blower with overhung impeller and cast volute, primarily for air compression

▪ High-speed asynchronous electric motor controlled by frequency converter (VSD)

▪ Impeller fitted directly on electric motor shaft

▪ Aerodynamic bearings:

- radial with tilting pads- minimal frictional loss- removes using of an oil

system(100% oil free solution)

MAIN DESCRIPTION AND APPLICATION

RotMach owns experimental high-speed blower withintegrated electric motor and rotor supported onaerodynamic bearings, 100% oil free solution. This nextgeneration design offers compact and low-cost base withbroad spectrum of R&D applications. We are looking for apartner for research activities based on this technology.

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DESIGNING SERVICES

We provide also solutions for an integration ofCentrifugal compressors and their accessories intonew/existing technology process. It can be also for othercompressor types – reciprocating compressor (piston) orscrew compressor

DESIGNING SERVICES FOR OTHER AREAS

▪ A cooperation by preparation of designing documentation, author´s supervision and participation at commissioning, in following areas:

-Industrial refrigeration units, winter stadium

- Compressor station for gas treatment and transport, chemical industry, metallurgy, etc.

- Cogeneration units for heat/electricity production

DESIGNING SERVICES FOR CENTRIFUGAL COMPRESSORS AREA

▪ Industrial refrigeration units

▪ Calculation and design of industrial refrigeration loop with compressor unit (screw compressor, reciprocating, centrifugal). One or more evaporation isotherms, cascade, etc.

▪ Integration of Centrifugal compressors and their accessories (vessels, valves, piping) into new/existing technology process

▪ Preparation of designing documentation for machine-technology part

▪ Supervision and participation at commissioning

CONTACT

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REFERENCES

Our know-how contributes to solving technicalchallenges of leading Czech and internationalcompanies operating in the area ofturbomachinery, rotating machinery,hydrodynamic Bearings, but for example alsoresearch and development.

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