Condition monitoring and machine maintenance services monitor the condition of machines, back-up batteries, battery banks, cabinets or racks, critical power supplies, processes and rotary equipment. Condition monitoring and machine maintenance services also perform predictive maintenance (PdM) and/or preventive maintenance to maintain reliability, avoid loss of life, and prevent costly, unplanned plant or machine shutdowns. Condition monitoring and related services under this category include: ferrography or oil analysis (lubricant testing) alignment, position, balance evaluation and correction, and ultrasonic fault detection. Other preventive machine maintenance services are repairs, part replacements, or lubrication replenishment performed on a regular time based schedule. Predicitve maintenance services are repairs, part replacements, or lubrication replenishment performed on based the results or predictions of condition monitoring. Condition monitoring, predictive maintenance, preventative maintenance, and other related services are important where rotary machinery or capital equipment are used in paper mills, chemical process plants, power plants, marine shipping, or other critical applications. Other condition monitoring and machine maintenance services are also commonly available.