#OIL VISCOSITY EXPLAINED MANUAL#

What is the difference between вЂњstraight-weightвЂќ and вЂњmulti-weightвЂќ (multi-viscosity) oil? So, SAE30 oil is also 30-weight, and both describe the oilвЂ™s viscosity or thickness. Each of these words are used interchangeably when people talk about motor oil. Thinner oils flow faster than thicker oils, and engineers design engines to work with a certain grade of oil.ДЇor all practical purposes, the terms вЂњgradeвЂќ and вЂњviscosityвЂќ refer to the same thing with motor oil. The higher the number, the thicker the oil. You might be familiar with terms such as вЂњ30-weightвЂќ or вЂњ10W-30вЂќ oil. Oil grades relate to an oil productвЂ™s performance at operating temperature (about 212 degrees Fahrenheit in your engine). Viscosity is the ability of a liquid to resist flow - how thick it is. Motor oil grades are a scale developed by the Society of Automotive Engineers (SAE) to describe the viscosity of oil. To start with, we should clear up some confusion over motor oil (also called вЂњengine oilвЂќ) terminology. When it comes to motor oil, what is a вЂњgradeвЂќ? ReferencesДiesel Engines 3rd Edition, by A.With all of the options available when it is time to purchase motor oil, how do you decide what to buy? Should you go for a particular brand? Or a certain type? Is conventional oil just as good as synthetic? Is one grade of oil better than another? And what does вЂњgradeвЂќ even mean? LetвЂ™s take a look at some commonly asked questions about motor oil and see if the answers can clear up some confusion. Differential pressure transmitters are also fitted to directly control the heater temperature and set the right viscosity limit.

Thermometer is fitted on the regulator to measure the fuel temperature and maintain the final temperature accordingly. The capillary tube is so designed that the form of flow between the inlet and outlet of the tube generates a pressure difference, which is equal to the viscosity of oil flowing through it.Д«ourdon tubes are used to monitor the viscosity at different points within the capillary tube. A regulated flow of fuel is sent by the pump to a capillary tube. The pump takes suction from the heater discharge and is generally fitted close to it. Viscosity regulator is an вЂњLвЂќ shaped instrument which consists of a small gear pump that rotates at a constant slow speed of 40 rpm.

The regulator is connected with the heater so that it can measure the viscosity of the oil and regulate the temperature at the same time. It is generally fitted at the outlet of the fuel oil heater. Viscosity Regulator or Viscotherm, is a device used to measure viscosity of the fuel oil before sending it to the engine. Viscosity regulators are used to regulate and maintain the fuel oil viscosity. Generally, fuel oil viscosity is regulated between 10-15 centistrokes at 50 degree Celsius. This practise of deriving fuels from different sources is the main reason for the high viscosity of fuel oil.It is for this reason that the viscosity of oil is checked and maintained within close limits, before sending it to the engineвЂ™s cylinder. Even if they are stored in different tanks, they finally get mix with each other when brought to the service tank. It is a usual practise on ship, to store fuels of different grades and properties into the same tank.

#OIL VISCOSITY EXPLAINED MANUAL#

This can be done by using either, automatically regulated heaters in order to maintain a constant temperature or by using a manual control which can be adjusted according to the requirement. Viscosity of high fuel oils can be reduced by raising its temperature with the help of a fuel oil heater. Thus, it is absolutely important to set the viscosity value in the right range. An efficient atomisation is the basic need for the healthy mixing of fuel and heated air, without which, no ignition or combustion can be derived. A high viscosity fuel oil leads to improper atomisation which in turn leads to incomplete combustion.High viscosity fuel prevents correct atomisation,which takes place in the fuel injectors. Viscosity is one of the most important factors which directly affects combustion quality.Д¬ontrolling the viscosity of fuel oil is an important aspect of an efficient combustion.

Fuel is the lifeblood on marine engines and hence proper characteristics of fuel need to be maintained on ships.

Oil viscosity explained