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220 cst viscosity9/15/2023 You are likely on top of your game and know exactly which oils and viscosities belongs in each application throughout your facility. If all of this is making sense, I commend you. 0W, 5W, 10W, etc., and straight weights 30, 40, and 50 are designations for crankcase oils, while 70W to 85W and 80 to 250 are designations for automotive gear oils. Society of Automotive Engineers (SAE) Crankcase and SAE Gear classifications are different yet. This stands for Saybolt Universal Seconds - or - Saybolt Seconds Universal, you'll see it stated either way. SUS - or - SSU is not in use much anymore, but you may still find it referenced on an older gearbox nameplate or an OEM (original equipment manufacturer) manual. The AGMA uses a #1 through #8A designation. ISO VG is stated at 40☌.ĪGMA specify grades an oil's viscosity for industrial gear applications, also at 40✬. This ranges from an ISO VG 2 to an ISO VG 3200. The International Standards Organization (ISO) is the universally accepted method for stating oil viscosity (ISO VG) through-out industry (ISO 3448). Stating an oil's viscosity is found in many different formats depending on the application. Normally viscosity is inversely proportional to temperature, meaning as the temperature of an oil increases, its viscosity generally will decrease. Viscosity should always be measured at a given temperature. Viscosity is what carries the load, separating surfaces in relative motion from touching, thus reducing friction and wear, extending equipment life. While this is the most common understanding of viscosity, a more technical definition of viscosity is a measurement of the oil's internal resistance or its resistance to flow by gravity. Along with this, viscosity is the easiest thing to mess up!Ī simple definition of viscosity is the thickness of an oil. Viscosity is the most important physical property of a lubricant, and viscosity is the most important specification for a lubricant. The importance of proper oil viscosity in your large array of equipment and the varying lubrication regimes they present is one of the most important maintenance practices one can focus on in their facilities. Rotating bobs are more common, rotating cups reduce the likelihood of vortex formation, and "cone and plate" viscometers create a constant shear rate at any speed.If you have a gearbox with a manufacturer's nameplate instructing you to use the American Gear Manufacturer's Association (AGMA) #4 viscosity oil at a given operating temperature, or if it specified a 750 SSU viscosity oil, would you know exactly what viscosity oil you need? If your grease application specified a base oil viscosity of 220 cSt for a given operating temperature would you know which of your greases might fit that specification, if any?ĭoes it really matter? Oil is oil, grease is grease, and more is better, right? Rotational viscometers use the concept of torque to measure the effort required to turn a disk or bob in a fluid.This can be done electronically for opaque fluids. Falling ball viscometers measure the time it takes for a sphere of a known size and density to descend through a stationary liquid.You calculate viscosity by measuring the amount of time it takes for the liquid to move between two marks. Liquid is drawn by suction into the upper bulb and allowed to flow down into the lower bulb. Glass capillary viscometers or Ostwald or Ubbelohde viscometers consist of a U-shaped glass tube held vertically in a controlled temperature bath.What Are the Different Types of Viscometers? Viscometers measure using a single flow condition. In general, viscometers move an object through a stationary fluid or move the fluid past a stationary object to measure the friction between the fluid and the object or surface. An example is the slower flow of syrup from a container - syrup is more viscous than water. Viscometers are instruments used to measure viscosity, the internal friction of the layers of a liquid in motion. Viscometers or viscosimeters are important to many industries, including the adhesive, biotech, chemical, food, paint, petroleum, and pharmaceutical industries. Instruments used to measure the viscosity of a fluid available in a variety of configurations.
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