PURIFIER LINE DIAGRAM
Q) What are the different processes by which fuel oils can be purified?
A) 1. Gravitational method i.e. put the oil in settling tank and then draining it continuously.
2. By Centrifugal force in a purifier.
Q) Out of the above mentioned methods which one is faster and why?
A) Centrifugal method is much more better than gravitational method. Reason can be explained as follows: F= m*g for gravity force F= (m*v^2)/r for centrifugal force
the value of “g” is constant i.e 9.8 m/s^ 2. while that of (v^2)/r can be increased to thousands of times. hence centrifugal method is better and faster than gravitational method.
Q) What are the difference bw purifier and clarifier?
A) 1. purifier can seperate solid impurities and water both from fuel oil while clarifier can seperate only soild impurities from fuel oil.
2. purifier has a gravity disc while clarifier doesnot.
3. purifier has a top disc with a neck while clarifier top disc doesnt contain a top disc with neck.
Q) What all factors effect the seperation in purifier?
A) 1. temperature
2. specific gravity of fuel oil
3. viscosity of fuel oil
4. feed rate of fuel oil.
Q) What is the interference line/ e- line and where should it be formed for best purification?
A) It is a line formed at the interface of oil and water and should be formed just inside the top disc outer circumference.
Q) what are the safeties incorporated in purifiers?
A) 1. low pressure switch in the outlet of clean oil to protect the oil going out with water.
2. emergency brakes to help the purifier to pass the critical speed as soon as posible.
3. High Pressure switch to avoid water to come with clean oil in the clean oil outlet.
4. Water transducer to avoid water to come with clean oil in clean oil outlet.
Q) You went inside purifier room and found out that the purifier is overflowing. what will be your reaction and what can br the probable causes?
A) 1. change over the 3 way valve from purifier inlet to the recirculation.
2. check for temperature and correct the same if not fight.
3. if temperature is fine then check rpm. this can be done by checking the amperage.
4. The feed rate may be more.
5.may be an o-ring has been worn out.
6. After correcting the problem, desuldge the purifier and start again.
Q) How will you desludge a purifier?
A) 1. Open the sealing water.
2. wait till water comea out of the overflow line.
3. close the sealing water.
4. close the operating water.
5. open and close the desludging water.
Q) How wil you start the purifier?
A) 1. check the lube oil level in purifier.
2. check the level of water in the water tank used to provide operating , sealing and desluding water to purifier.
3. open the steam of the fuel oil heater and wait till the temperature reaches about 85-90 degree celcius.
4. Now start the purifier and watch for the amperage. it should rise upto 20 Amps and should come down to about 5 Amps.
5. Now open the operating water.
6. open the sealing water and wait till water comes out of the outflow line.
7. close the sealing water.
8. open the purifier pump and adjust the feed rate and check the back pressure. back pressure must be about 0.8 bar.
Q) After overhauling the purifier and changing all the o-rings you found out that the purifier is overflowing.what can be the cause?
A) the rpm of the purifier may not be attained. this will not let the pilot valve to get closed as it get closed due to centifugal force which inturn depends on the rpm. this will avoid the closing up of the moving bowl as the sealing water gets drained and will lead to the overflow of the purifier.
Q) Whay is the disc stake is provided?
A) To reduce the settling distance of the impurities and hence increase the speed with which purification process can take place.