CfsOperating Cost of Lost Energy from Seal Friction
These are the costs associated with the energy required by the compressor driver to overcome frictional losses of the mechanical seal and any viscous drag caused by the seal oil.
CssOperating Cost of Energy Required to Operate Seal Oil System
These are the costs associated with electrical motors used to circulate the seal oil and forced convection heat exchangers.
ClOperating Cost of Lost Energy and Product Loss due to Leakage
This is the cost associated with the energy used to compress gas that subsequently leaks out of the compressor casing via the mechanical seal together with the value of the leaked gas
CfpOperating Cost of Lost Energy to Overcome Pipe Friction Due To Oil Contamination
This is the cost of the energy consumed by the compressor driver to overcome frictional losses in the compressor discharge pipeline as a result of contamination of the pipe surface from oil leaked by the mechanical seal into the compressor
CenOperating Cost to Replace Consumed Seal Oil
This is the cost of replacing seal oil that is leaked by the mechanical seal either into the compressor or to atmosphere.
CmMaintenance and Downtime Costs
This is a combination of the cost for parts and labor used to maintain the seal and sealing system on scheduled maintenance events and unscheduled seal or system failures together with any costs associated with lost productivity due to the compressor being inoperable.
CpCost of Process and Purge Gas Used During Compressor Blowdown
This is the cost to of the compressed gas lost together with inert blanket gas used to in order to decompress the compressor and facilitate maintenance on the shaft seals.
CgCost of Gas Seal Separation Gas Consumption
This is the cost of the separation gas used with a gas seal that is injected into the separation seal that is fitted in between the gas seal and the compressor bearings.
CicInitial Purchase Cost
This is the initial cost to purchase the sealing solution, and may include engineering, bid process expenses, PO administration, testing, source inspection, and initial spares as appropriate, provided all scenarios are treated in a similar fashion.
CinInstallation Cost
These costs may include special area preparations, installation and connection of utilities piping systems, electrical wiring and instrumentation, installation of auxiliary systems, and special services required at start-up.
CdDecommissioning and Disposal Cost
This is the cost to dispose the existing seal and/or sealing system that is being replaced by the seal upgrade retrofit. The costs are incurred at the time of the retrofit.
