Machinery Lubrication

Machinery Lubrication March April 2014

Machinery Lubrication magazine published by Noria Corporation

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www.machinerylubrication.com | March - April 2014 | 47 There are several sample valve variations. Some are designed to facilitate sampling from pressurized systems, while others require an additional suction device to pull the sample from an unpressurized system. One of the most common sample valves is called a minimess. These types of valves are preferred because they allow sampling without interfering with the machine's operation. They cause little flow restriction with higher viscosity fluids and can be installed on systems with pressures up to 6,000 psi. For lower pressures (less than 750 psi), other valves may be selected, such as the push or flush styles. These can be installed on return lines, suction lines, before off-line filters or similar locations. If sampling within a sump cavity, a stainless steel pilot tube of various lengths can be joined with the valve to allow the sample's flow to be originated from a representative location within the sump, i.e., a "live-zone" location. Possible sample locations for a splash/bath-lu- bricated machine are shown above. Sample Tube and Vacuum Devices Along with the sample valve, a sample tube (or sample probe) will be necessary to transfer fluid from the valve to the sample bottle. If the fluid is pressurized, a probe-on sample bottle/tube configuration can be used to extract fluid directly into the bottle through a lid with two holes — one for the sample tube and one for air release. If the fluid is not pressurized, a vacuum sampling device will be Drop-tube static sampling Probe-on static sampling Probe-on drain-port sampling with pilot tube Off-line sampling Filter should be put in bypass prior to sampling Risk of cross- contamination *Depends on ratio of residual oil volume (in filter cart lines) to the total oil volume in machine being sampled. A new product recently introduced by Luneta features a built-in sample port (with a pilot tube) and offers quick access to a variety of field lubricant tests. The Condition Monitoring Pod (CMP) does not simply act like a level gauge but also contains a magnetic plug, corrosion gauge and other func- tionalities all in one. Visit w w w. Luneta.com for more information. Condition Monitoring Pod Sample locations for a splash/bath-lubricated machine

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