PALL Sentry
Varnish is a thin, insoluble film deposit that forms on oil-wetted surfaces in turbine lubricant systems, including bearings and servo valves. Its formation is often associated with higher operating temperatures, smaller fluid reservoirs, high cyclic service, and fluid base stocks that have lower solvency for varnish precursors.
When varnish forms in turbine oil, the effects can be detrimental to equipment operation and availability, which may include:
• Sluggish controls and servo valve stickiness, which can lead to expensive repairs or replacement
• Costly downtime due to unscheduled outages
• Delayed start-up of an unresponsive control system
The demand for greater reliability, availability and operability of today's power turbines requires efficient, simple and reliable methods for removing varnish, both from oil and metal surfaces within the machine.
Varnish Removal System with Pall Sentry
The Pall Sentry™ resin-based system is designed to efficiently remove varnish precursors from oil. By doing this, the lacquer deposits on the metal surface will return into solution for further removal by the Sentry maintenance slip. Maintenance continues while the turbine is in operation, until the entire oil system is free of varnish, as indicated by consistently low MPC values ??in the oil.
Efficiency and Ease of Use
Other methods of filtration or electrostatic removal are highly dependent on conditions such as operating temperature, cycle rate, and chemical makeup of the oil.
Pall Sentry resin-based varnish removal skids are capable of removing varnish precursors more reliably and efficiently. This is because these tools are largely temperature independent and do not require mechanical interception of varnish precursors.
This self-contained system uses specially formulated resin in a semi-dry package. This system uses three bags of resin stacked in a vessel, which can be easily replaced and discarded when the varnish is removed.
Operation
The Pall Sentry fluid processing system connects to the main lubricant or control oil reservoir and circulates fluid at a rate of 3 gpm (11.35 l/m). The liquid passes through Pall Ultipleat® SRT resin and filters which are very efficient in removing particles. This is the latest generation in engine lubricant protection. Each time fluid passes through the system, the varnish precursor is removed and the fluid is returned to the reservoir.
For further information, please contact: PT Hyprowira Adhitama, as a PALL distributor in Indonesia. Please see details in the brochure here.