Once you’re working in a machinery situation where the temperatures get a little heated, choosing the right grease is a critical resolution to get right. How do you make the correct decision?

The internet has some glorious resources on the market that can help guide you to making the correct decision.

One such resource is the Machinery Lubrication web site, the place we discovered an excellent primer on all the factors that it’s worthwhile to consider in deciding on the appropriate kind of high temperature grease.

While you’re working in a machinery situation the place the temperatures get a little heated, selecting the best grease is a critical determination to get right. How do you make the right decision?

The internet has some excellent resources out there that may assist guide you to making the fitting decision.

One such resource is the Machinery Lubrication web site, where we found a wonderful primer on all the factors that you could consider in choosing the appropriate kind of high temperature grease.

deciding on a high temperature greaseWe’ve referenced a lot of that information here.

For the total article, check out Machinery Lubrication’s web site here.

What To Consider?

There are various criteria to consider when choosing a high-temperature grease for warm, grease-lubricated equipment – oil type and viscosity, oil viscosity index, thickener type, stability of the composition formed by the oil and the thickener, additive composition and properties, ambient temperature, working temperature, atmospheric contamination, loading, speed, relubrication intervals, etc. With the variety of particulars to resolve, the selection of greases that must accommodate extreme temperature conditions is a challenging determination, and given potential for incompatibility problems and the high prices for a lot of high-temperature grease, you really need to be selective and discriminating when making the decision of which grease to use.

‘High temperature’ is relative when characterizing temperature conditions. Bearings running in a metal mill roll-out table application could also be exposed to process temperatures of a number of hundreds of degrees, and will experience sustained temperatures of 250ºF to 300ºF (120ºC to ±150ºC). Automotive assemblers dangle painted metal parts on lengthy conveyors and weave them by way of massive drying ovens to dry painted metal surfaces. Operating temperatures for these gas-fired ovens are maintained round 400ºF (205ºC). You’ll be able to see that there’s a wide temperature range to consider here.

In these two cases, the selection factors differ appreciably. In addition to heat resistance, the grease to be used in a sizzling metal mill application may require distinctive load-carrying capability, oxidation stability, mechanical stability, water wash resistance and good pumpability, and at a price suitable for giant-quantity consumption. With all the essential factors to consider, it is beneficial to have a grease choice strategy.

Where To Start?

A reasonable starting level for selecting a high-temperature grease is to consider the nature of the temperatures and the causes of product degradation that are inherent to whatever place you are going to be utilizing it. There is normal correlation between a grease’s useful temperature range and the anticipated worth per pound. For instance, a fluorinated hydrocarbon-based mostly (type of artificial oil) grease could work effectively as high as 570ºF (300ºC) in area applications however may also price hundreds of dollars per pound. How well the grease holds up long-time period is influenced by the causes of degradation, three of which are particularly necessary: mechanical (shear and stress) stability, oxidative stability and thermal stability. Oxidative and thermal stresses are interrelated. High-temperature applications will typically degrade the grease by thermal stress, in conjunction with oxidative failure occurring if the product is involved with air. This is similar to what is to be anticipated with most industrial oil-lubricated applications. Bell Performance’s X-tra Lube Grease provides some advantages in these types of situations because of the residual lubricating energy of its additive package, that continues providing lubricating protection after different parts of the grease could have broken down resulting from these factors in regular use.

What’s In A Grease?

high temperature greaseFor the uninitiated, grease consists of a base oil with a thickener added, plus extra additives thrown in to bulk up certain essential properties of the grease. Think of the entire thing like a sponge – the thickener is the spongy supplies that holds the base oil collectively like a sponger holds liquid.

Base Oils

When deciding on lubricants for oil-lubricated applications, one often begins with the consideration of base oil performance properties. This is also a great starting level for grease products. Base oils will be subdivided into mineral and artificial types. Mineral oils are the most widely used base oil part, representing approximately ninety five % of the greases manufactured. Artificial esters and PAO (synthetic hydrocarbons) are next, adopted by silicones and a few other exotic synthetic oils.

The American Petroleum Institute divides base oils into 5 categories based mostly on their performance limits (Teams I-V). They tend to differ by how well they resist thermal or oxidative break down, and how well they disperse and hold the additives which might be added to the grease product. Generaally speaking, the higher Teams are more resistant but price more.

Mineral and synthetic base oils degrade thermally in conjunction with oxidative degradation if the product is involved with air. The break point at which the individual oil molecules in a highly refined (Group II+, Group III) mineral oil and synthetic hydrocarbons will begin to unravel, releasing carbon atoms from the molecular chain, is about 536ºF to 608ºF (280ºC to 320ºC). three,four The grease producer will choose materials given their acquaintedity, and perhaps availability, of the raw materials. If the producer makes a particular type of artificial base fluid and is intimately acquainted with the various destruction mechanisms of that fluid, then it is likely that this type of artificial base will typically be selected for new product development.

Thickeners

The supplies chosen as the grease thickeners may be organic, equivalent to polyurea; inorganic, reminiscent of clay or fumed silica; or a cleaning soap/complicated cleaning soap, equivalent to lithium, aluminum or calcium sulfonate complex. The usefulness of the grease over time will depend on the entire package collectively, not just one thing like the thickening system or the type of base oil. As an illustration, a silica grease thickener has a dropping point of 2,732ºF (1,500ºC) as one excessive example. However, because grease performance depends on a combination of supplies, this does not represent the useful temperature range. Some examples of the kinds of thickeners you’ll have to choose from could be:

Natural polyurea – offers temperature range limits just like the metal soap-thickened grease, however additionally it has good antioxidation and antiwear properties that come from the thickener itself. Polyurea thickeners would possibly become more standard but they’re tough to manufacture, requiring the dealing with of several toxic materials. While the thickener has a high dropping point, the composition begins to thermally degrade at temperatures which limit its usefulness over time at high temperatures.

Calcium sulfonate – just like the polyurea, it possesses inherent antioxidant, rust-inhibiting properties, however in addition has inherent high dropping factors and EP/antiwear properties.

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