sudeyaa
07.06.2021 13:46:59
If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. [links]
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If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. [links]
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While the bearing is running, slowly pump in the new grease until the excess grease being purged from the bearing changes in consistency or color. This waste grease should eventually appear similar to the new product. here
Verify that the bearing is operating properly before switching products. Improper fits, clearances, bearing configurations or existing bearing damage cannot be corrected by changes in lubrication. more
Repeat the previous step after one to two hours of operation or after the bearing has returned to normal, steady-state operating condition. here
Initiate testing (power consumption, amperage draw, relubrication frequency, vibration, etc.). [links]
Verify that the bearing arrangement allows excess lubricant to be purged from the system. Bearing damage may result in sealed-for-life or shielded bearing arrangements. more
A common area for grease mixing is in new and rebuilt equipment. Even when all plant personnel are given clear guidance on using the correct products, equipment may be returned to the facility with a grease that is different than what will be added while in service. New bearings, gears, motors, etc., often come supplied with a product that is incompatible with the grease being used to relubricate.
The three products that appeared in each of the tables were aluminum complex, lithium complex and calcium complex. However, the commonality ends there. A total of 25 different product descriptions were found in the 17 tables. Some may have been referring to the same product categories but failed to use common nomenclature, so it is difficult to determine where there might be an overlap. [links]
These variations reveal an obvious formulation difference between the greases (most likely involving anti-wear additives), but this alone would not be sufficient to disqualify the mixture for compatibility if the resulting product still functioned effectively with regard to wear resistance.
Upon observation, it becomes obvious that several of the charts are derived from the others. The various descriptions used imply that some may have been copied from the others. Many charts include a disclaimer, usually stating that it would be preferable to clean out all old grease and avoid any mixing, or that the charts are believed to be accurate at the time of publication. This underscores the challenge of finding a single authoritative chart to be used with confidence when making decisions regarding grease mixing. here
Table 4. The rheological values for the two worked reference samples and the 50-50 worked mixture, with the values of concern in yellow
A selection of 17 compatibility charts was recently evaluated for differences. Table 1 shows the labels used in these charts and how many times these descriptions appear in the charts. Seventeen occurrences would indicate that a grease category was present in each of the charts found, and there were only three such products.
Grease compatibility is often confusing to grease users, even though most grease manufacturers produce compatibility charts. This is because the charts from the various manufacturers often disagree with one another on certain thickener-type combinations. In bygone days, when simple soaps and clay were the primary thickener types, compatibility was relatively straightforward.
To help users understand the implications of mixing greases, ASTM International (formerly the American Society for Testing and Materials) Committee D02.G developed ASTM D6185 Standard Practice for Evaluating Compatibility of Binary Mixtures of Lubricating Greases in 1997. This document details the procedure for evaluating the basic compatibility of greases, which is determined by measuring the dropping point, the mechanical stability and the change in consistency of the mixture upon heating. [links]
The change in consistency of the mixture following elevated temperature storage is within the range of the change in consistency of the individual greases following elevated temperature storage.
Borderline – The properties of the mixture may or may not be acceptable, depending on the nature of the application. here
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If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware.
If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. more