Table of Contents
- 1 How can the viscosity of fuel oil be adjusted in the fuel oil system?
- 2 How is heavy fuel oil viscosity maintained on board?
- 3 What component in the system is used to maintain the correct viscosity of the fuel before entering main engine?
- 4 How does a fuel oil system work?
- 5 How can the viscosity of fuel oil affect the performance and combustion efficiency of oil fired furnaces?
- 6 What is the viscosity of fuel oil?
- 7 Why does fuel oil have a high viscosity?
- 8 What is the role of viscosity in marine engine performance?
How can the viscosity of fuel oil be adjusted in the fuel oil system?
Increasing the temperature of a fuel will reduce its viscosity, and vice-versa. As a result of the varying properties of marine fuels, often within one tank, actual viscosity must be continuously measured and then corrected by temperature adjustment.
How is heavy fuel oil viscosity maintained on board?
A viscotherm or viscometer is used to measure the viscosity of fuel oil at the fuel injection system of the engine. It consists of a capillary tube inside of which a gear pump is fitted which rotates at very slow rpm (say 40 rpm). There is an outside casing provided for the capillary tube.
What is the requirements of fuel oil before passing to the engine?
Fuel oils require treatment before passing to the engine. This will involve storage and heating to allow separation of water present, coarse and fine filtering to remove solid particles and also centrifuging.
Why is viscosity important in fuel oil?
Viscosity is one of the most important factors which directly affects combustion quality. 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.
What component in the system is used to maintain the correct viscosity of the fuel before entering main engine?
The viscosity regulator controls the fuel oil temperature in order to provide the correct viscosity for combustion. A pressure regulating valve ensures a constant-pressure supply to the engine- driven pumps, and a pre-warming bypass is used to heat up the fuel before starting the engine.
How does a fuel oil system work?
The fuel oil service system is designed to deliver fuel oil to the boilers at temperatures and pressures suitable for satisfactory combustion. The system basically consists of settling tanks, suction and discharge strainers, pumps, heating coils, seven valves to properly meter fuel and other assorted hardware.
What methods of heavy fuel oil is the first stage in cleaning fuel oil?
The settling tank is the first step in fuel treatment process. Water and sediments can be separated by gravity and drained off at the bottom of the tank. Effective cleaning of residual fuels can only be ensured by centrifuges: a clarifier to separate particles and/or a purifier to separate water.
What temperature should lubricating oil be maintained at when passing through the purifier?
Water should be injected into the oil before purifying at a rate of between 3 to 5\% of oil flow that is also continuously renews the water seal in the purifier bowl. The oil temperature should be around 75 c and water temperature about 5c higher than oil.
How can the viscosity of fuel oil affect the performance and combustion efficiency of oil fired furnaces?
The viscosity (resistance to flow) of fuel oil increases as its temperature decreases. The higher the viscosity, SSU number, the more resistant to flow the oil is. An increase in viscosity of this magnitude will increase nozzle flow rate at 100 psi by 10\% and increase the oil droplet size.
What is the viscosity of fuel oil?
10–20 cSt
Fuel oil’s viscosity strongly depends on the temperature, the higher is the temperature the lower is the viscosity. For optimal combustion the viscosity of the fuel should be in the range of 10–20 cSt. To maintain this value a combination of viscometer, PID controller and heater is used.
How do you prepare the main engine for starting prior to departure?
Things to do at 1 hour notice period
- A quick round of engine room is taken and chief engineer has to be reported regarding the departure.
- Check oil level, header tank level, cylinder oil daily tank level.
- Check the pressure of fuel oil pump, booster pump, lube oil pump etc.
- Check sump oil level in air compressor.
What are the components of fuel oil system?
The system consists of: a supply flow meter, supply pumps, circulating pumps, preheaters, the final filter, a viscosity controller, a FO venting box.
Why does fuel oil have a high viscosity?
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 engine’s cylinder. Generally, fuel oil viscosity is regulated between 10-15 centistrokes at 50 degree Celsius.
What is the role of viscosity in marine engine performance?
/ By /. Fuel is the lifeblood on marine engines and hence proper characteristics of fuel need to be maintained on ships. Viscosity is one of the most important factors which directly affects combustion quality. Controlling the viscosity of fuel oil is an important aspect of an efficient combustion.
What is a fuel oil viscosity regulator?
Viscosity Regulator or Viscotherm, is a device used to measure viscosity of the fuel oil before sending it to the engine. It is generally fitted at the outlet of the fuel oil heater. 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.
How do I find the viscosity of motor oil?
Vehicle manufacturers specify in the owner’s manual which viscosity of motor oil you should use. You can always use the AMSOIL Product Guide to find that information, too. But keep in mind that your vehicle’s viscosity requirements may change if you’ve modified your engine.