Machine health diagnostic services (SDS):


in the business of protecting our Customer’s businesses - our engineers specialize in providing information for solving machinery problems. Such problems are not uncommon and troubleshooting can be expensive in terms of repair costs and down time. These problems can be complex, with no apparent “quick“ solution. In order to get machinery back on line as quickly as possible, one often needs diagnostic checks, meaningful information and pre-emptive action based on proper gathering, understanding and analysis of data using the most sophisticated tools. Production output and corporate profits depend on it so we know that Customers need result oriented actions, not just raw data, to help determine what is wrong with a machine, how long it can operate in its present condition, and how can the problem be corrected. This is the only way one can make sound decisions in critical situations.

It may not be economically feasible for one company to maintain in-house inventory of the above skills and equipment & and keep replenishing/updating it to undertake such diagnostic activities - this is where Sherman Diagnostic Services (or SDS) can be of help. SDS is a division of Sherman International Pvt. Ltd, who has been providing products and services for over 30 years to the Industry.

Result oriented actions are key and there are three important elements that are needed to generate this - they are:

• Proper human capital, skills, training, exposure, knowledge, focused approach, contract handling capability and tools (i.e. monitoring and test instruments).
• Intellectual Capital to analyse and translate raw data into ‘meaningful information’.
• Credibility through years of experience to suggest corrective actions using this ‘meaningful information’.


consists of:


is wide and varied. We have completed many prestigious assignments. We have been fortunate to handle some very large projects - one such job includes monitoring machines along India’s LARGEST gas pipeline for about 10 years. This mammoth job includes monitoring about 900 Pump Motor sets, about 100 Reciprocating Pump & Compressors, about 50 Gas Turbine with Compressors, over 20 Diesel Engines with pumps, approximately 10 Gas Turbine Driven Generators, about 5 Expander Compressors and some other rotating equipment along the pipeline and have built not only a strong reputation, but


have been built working
• in Various locations,
• in Various plants,
• on Various equipment,
• covering Various Customers,
• in Various conditions
for over 12 years now.


are focused and result oriented. SDS is experienced in interpreting spectrum analysis, trend analysis, orbit / time base analysis, shaft average centreline position analysis, rpm versus time plot analysis etc. Besides Vibration measurement & analysis, problem diagnosis of rotating / reciprocating machines & structures likes piping etc. SDS also offers insitu dynamic balancing of Turbines, Generators, Motors and Fans, machine audits, consultancy on corrective actions, Failure analysis & predictive Maintenance. We can diagnose vibration related problems on Turbines, Compressors, Generators, Pumps, Fans, Blowers, Gear Boxes, Motors etc. The type of Problems which can be identified are: Unbalance, Misalignment / Preloads, Fluid induced instabilities (Whirl / Whip), Rubs, Loose parts (Rotating and stationery), Structural resonance, Foundation Problems, Rolling element bearing defects, Rotor bows, Fluid film bearing faults, Thrust Problems, Gear Problems etc.

  • We use BN’s Snap Shot & TK analyzer series and SKF’s Micrologs. The Snapshot is a double channel equipment which is used to collect data which can be retrieved on to a software called SSPLUS using which we can get different outputs. The SKF Microlog is a single channel equipment working along the PRISM4 software. The TK 81 is used to see the amplitude of vibration in all three modes while the TK 83 is used for Phase analysis, which helps in devising methods for proper balancing. This is very useful for balancing jobs. We have also been asked to use, at times, the ADRE for TRANSIENT MODE analysis.

    Our team takes these equipments along with necessary Transducers to the various rotating machinery installed in Plants. They also take reading from the vibration monitors installed in control rooms. After taking readings they transfer the data obtained into a computer that is used to generate (a) various plots and (b) trend graphs including generating Spectrum, Orbit and Shaft Centre Line Graphs etc. All these reports are then analyzed based on our intellectual capital. We then consult the Customer on corrective actions that result in improving the operating condition of the rotating machinery and plant output and efficiency levels by reducing unplanned breakdowns and allowing Plant operators to take predictive and preventive action based on our consultancy to ensure a very high degree of the machine availability. This not only results in longer life of the equipment but also saves money. Once corrective action is taken, we again conduct an analysis based on vibration data to confirm if our recommendations have been of value. We are provide Clients with reports related to/for/covering:

  • Unbalance
  • Misalignment
  • Mechanical looseness/ Loose mountings
  • Rigidity and Soft foot
  • Bearing inaccuracies
  • Electrical related problems on motor such phase unbalance, winding problems,
  • Flow problems on pumps
  • Cavitation problems on centrifugal pumps
  • Oil whirl/oil whip
  • Gear meshing problems/worn out gear teeth
  • Shaft bent / crack
  • Pipe strains
  • Coupling / belt inaccuracies
  • Belt slippage/belt tension
  • Scoring on shafts
  • Improper fittings of pump internals
  • Resonance
  • Mechanical run out
  • Electrical run out
  • Probe's loose mountings and Probe related problems
  • Rubbing
  • Worn out impellers/Vanes
  • Inner/Outer race passing problems in antifriction bearings & others …