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Reliability, Availability and Maintainability (RAM)

One of the most current practicable maintenance strategy is Reliability, Availability and Maintainability (RAM) Method). Reliability is measure of probability that equipment (or process) will perform its designed function for specified period or simply probability of success. Reliability purposes/characteristics are:

  • Characterized by MTBF (Mean Time Between Failures)
  • Calculated from time between loss of function (Failures, Corrective activities, Preventive acivities)
  • Maintenance directly improves Reliability by increasing the time between losses of function.
  • Reliability is a quality for certain period of time

Maintainability is a measure of how easy it is to restore function. It is measured by how long it takes to restore function to the system. Restoring function is more than just the repair time. It also includes the time spent preparing to repair and starting up after repair (Restore Time = Prepare to repair + Repair + Startup time). Maintenance directly improves Maintainability by shortening Restore Times.

Availability is a relative measure of the extent that equipment (or a system) can perform it's design function. Average Availability can be calculated from up time divided by total calendar time, on from:

  • MTBF (Mean Time Between Failures)
  • MTTR (Mean Time To Restore)

Obviously, the higher reliability and availability, the better the maintenance practices. The goals of any maintenance strategy in one company is thus to achieve the highest RAM values but at the most cost effective way, and therefore, RAM analysis will be combined with Life Cycle Cost (LCC) analysis.

Our Services

AT Solusi has been in the business engineering consulting in the area of risk engineering and asset integrity (RBI, QRA, RAM, PIM, RCA and HAZOP) for oil and gas industry, power plant, petrochemical and chemical industries. We have extensive experience in onshore and offshore pipeline design, inspection, maintenance and fitness for service analysis, as well as plants risk and safety assessment. We have also involved in many project on mechanical and pressure system reliability and integrity analysis including separators, tanks, piping, boilers, and heat exchangers. For the last five years, we have been exposed in RAM analysis for gas processing plant and gas compressor station including FMECA and FTA for rotating equipment such as compressors, gas turbines and pumps.


Risk Based Inspection (RBI)

Risk Based Inspection (RBI) is a risk method, based on API RBD 581, to determine risk levels by considering the probability of failure or failure rate of the mechanical and pressurized system and the consequences of failures of those equipments. The results are then used to prioritize the inspection and maintenance time interval according to the criticality ranks and/or remaining life of the equipments. RBI is applicable for pressure vessels, piping, in-plant pipeline, tanks, heat exchangers, heater, and other pressurized system where the failure mode is leak or rupture causing the flammable or toxic material to release to the atmosphere, therefore, endangering people safety, environments, and assets. 




Benefit of RBI 

a. It improves the reliability and safety aspects. 

b. It increases the effectiveness and efficiency of inspection and maintenance programs.

c. It increases operational life time of the equipment (life extension program).

d. It improves the public trust to operator/owner performance because indicate open risk and integrity management.

e. It increases the company value since reliability is assured.

f. It decreases the inspection and maintenance cost.

g. It increase the equipment life time because the damage can be detected and identified earlier and thus more focus                       on risk.



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PT AT Solusi
Mega Arvia Building 4th, Jln. Iskandar Muda No.29 Jakarta 12240

Phone : +6221 7291907
Fax     : +6221 72895251

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